HFM brazed type plate heat exchanger, heard they are very popular this summer. Small size while high efficiency. Very adorable like little Hobbits. Online quotation send email to service@hfm-phe.com
Sunday, July 30, 2017
HFM PHE March
Let's have a phe march to celebrate the 90th birthday of Chinese force army!
Today, China has grown stronger either in force or in economy. We are proud that Chinese manufacturers are competitive in the global market.
To China, To Global!
Contact: service@hfm-phe.com
Contact: service@hfm-phe.com
Wednesday, July 12, 2017
Thursday, March 16, 2017
How to Replace a Heat Exchanger
Using a boiler to heat your home (or furnace) will require the use of a heat exchanger. The heat exchanger is installed inside either of these heating units and its purpose is to exchange heat with either air (in a forced air system) or water (in a radiant heat system). There are several ways in which the heat exchanger does this job. The 2 elements can run together in the heat exchanger or exists apart but run close together so the heat is exchanged. Over time a heat exchanger can fail and you can replace it yourself and this article will show you how.
Step 1 - Safety
Step 1 - Safety
When you work with a furnace or boiler you need to take just as many precautions as you would when working around electrical wiring. Disconnecting or accidentally puncturing a pipe or hose can cause a stream of steam bellowing toward you. This will surely send you to an emergency room. Prior to replacing the heat exchanger you should turn the electric off at the main breaker. Give the furnace or boiler time to cool down before around it. It is a good idea to replace a heat exchanger when the weather outside is warmer. Be sure to wear work gloves as you'll be working around sharp edges and getting cut is easy to do.
Step 2 - Access to Heat Exchanger
The boiler or furnace houses the heat exchanger and you need to go through it in order to get access to the heat exchanger. Locate the screws on the front of the boiler or furnace. There may be several sets of screws. If there are several sets of screws then remove them all. Once the screws are removed you can remove the metal panels. You may need to use a screwdriver to pry them free. Work in sections and place the screws inside the holes of the plate they came from as you remove them so you do not lose screws. The heat exchanger resembles a metal plate and will have tubes coming off of it.
Step 3 - Replacing the Heat Exchanger
Before you begin removing the heat exchanger always take notes of where everything is attached and the orientation of the heat exchanger. If you purchased an identical heat exchanger to the old one (always the best idea) then reconnecting it will be simple. Consult the manual of a new heat exchanger if it is different as you may need to make adjustments to the fittings inside the boiler or furnace.
Use the screwdriver and wrench to remove the fittings attached to the heat exchanger. Once they are removed, the heat exchanger should be able to be pulled free rather easily. Put it off to the side and slide the new heat exchanger into place. Start replacing the fittings and tighten them as needed. Once the new heat exchanger is in place you can replace the panels and turn the power back on. The system will need time to prime itself before operating.
Wednesday, March 15, 2017
Evolution of Plate Heat Exchangers
By Bengt Sundén, R. M. Manglik
Since its inception in the 1920s for commercial usage, primarily in the dairy industry, the traditional plate-and-frame heat exchanger has evolved over the last several decades and variant models of PHEs have been developed. Although some of these modifications have been driven by new strategies for making more compact equipment, others have focused on overcoming some of the disadvantages and expanding the applications spectrum of PHEs. This evolution has typically manifested either as an altered structure or construction of the PHE or as variations in the plate surfaces corrugation patterns. In the former category during the last several decades, brazed, semi-welded, fully welded, wide-gap, double-wall PHEs, among many others, where the gasketing has been eliminated, have been developed.
Brazed plate heat exchanger
The brazed plate heat exchanger (BPHE) is essentially made up of a pack of thin corrugated stainless steel plates that are brazed together using copper as a brazing material to form a self-contained unit. Brazing eliminates the need of either frames or gaskets and results in a very compact exchanger. Also, instead of copper, where its use presents a compatibility problem with a process stream (e.g. ammonia), nickel or some other brazing material is used.
Brazed Plate Heat Exchanger
Because the plates are brazed to each other and there are no frames or gaskets, BHEs can handle higher pressure and temperatures than plate-and-frame heat exchangers, e.g. situations with pressure up to 30 bar and temperatures up to 400C. They are also characterized by very low weight due to the absence of frames. However, the exchanger length is usually less than 1m because of the brazing furnace size limitation, where their capacity is restricted to a single BPHE unit. Typical applications include heating and cooling (sensible or with phase change) in the process industry, evaporation and condensation in refrigeration systems, and other HVAC installations.
Semi-welded plate heat exchanger
By welding heat exchanger plates in pairs, to make what are commercially called twin plates, a semi-welded PHE is configured by assembing them in a plate-and-frame pack with gaskets only in the plate channels that handle the alternate fluid stream. This design is especially useful for handling relatively corrosive media, which flows in the welded twin-plate channels. The only gaskets in contact with this medium are two circular porthole gaskets between the welded plate pairs that are typically available in highly resistant elastomer and non-elastomer materials. The channels containing the non-corrosive, non-aggressive, secondary heating or cooling fluid medium flows are sealed using traditional elastomer gaskets.
The semi-welded PHEs can withstand pressures up to 30 bar on the welded twin-plate fluid side, though it should be pointed out that frames are still needed to hold the plate pack. The relatively higher pressure operation extends its applications to include evaporation and condensation in refrigeration and air-conditioning systems, among others.
Phe gaskets &plates
Fully welded plate heat exchanger
The fully welded PHE is a gasket-free version, where a completely welded plate pack is bolted between the two end plates in a conventional frame. By joining the plates at their edges and eliminating the gaskets, the structural integrity of the plate pack is significantly enhanced, and so are the operating temperature and pressure limits of the gasketed PHEs. The laser welds are applied in two spatial dimensions along the edges in the plane of the plates. This allows the plate pack to expand and contract along its length as temperature and pressure changes take place, thereby making the pack more fatigue resistant. Consequently, they are particularly attractive for applications where the heat transfer for thermal processing undergoes rapid changes in temperature and /or pressure. However, fully welded PHEs, unlike gasketed and semi-welded models, lose the flexibility of either expanding or decreasing their surface area by adding or removing plates for meeting varing heat load requirements. Also, they cannot be cleaned readily by mechanical methods, and only chemical cleaning methods can be employed.
The fully welded PHEs are intended for thermal processes with severe duty requirements that often involve handling of highly aggressive or corrosive fluids. They can withstand temperatures up to 350C and pressure up to 40 bar. Typical applications included exchangers for desuperheating in heat recovery systems, refrigeration interchangers, and heaters of organic chemicals such as solvents, vegetable oils, steam, and batch reactors, among others.
Fully welded plate heat exchanger
Wide-gap plate heat exchanger
PHEs with wide-gap plate packs provide larger free-flow area channels for handling fluids containing fibres or coarse particles and high-viscous fluids, which normally clog or cannot be satisfactorily treated in other types of PHEs and still retain some of enhanced thermal-hydraulic performance characteristics. The plate-surface corrugations and gaskets are designed such that in the inter-plate channels the flow cross-section has a maximum gap of up to 16mm. The plate corrugations still provide an effective area enlargement and promote swirl flows to effect high heat transfer coefficients; the wider flow gap, however, tends to reduce the pressure drop penalty.
Typical applications include heating of raw, limed, and mixed juice in sugar mills, cooling and blenching of plant filtrate in pulp and paper mills, and sanitization of fibrous food product slurries.
Double-wall plate heat exchangers
The double-wall PHE is designed for use with either a reacting media or when product contamination between the two fluid steams must be avoided 'fail safe'. Double plates, sealed by conventional gaskets, replace the single plate that normally separates the two fluid media. In the event of the media reacting with the corroding the surface of the double-wall plates, the leakage is directed in the passage between the double plates. This essentially minimizes the possiblity of inter-fluid contamination, and the leakage also becomes easily visible on the outside of the heat exchanger. The more common applications of this type of PHE include, among others, heating and cooling of drinking water, pharmaceutical media, lubricating oil, and transformer oil.
PHE plates
Diabon graphite plate heat exchanger
The Diabon graphite PHE employs graphite plates which are developed for thermal processing of media that is normally too corrosive for plates made of exotic metals and alloys. The Diabon F100, or NSI graphite, is a composite material made up of graphite and fluoroplastics. The material is compressed into the shape of surface corrugated plates, and the formed plates are fitted with thin, flat, corrosion-resistant gaskets. Besides being corrosion resistant and capable of with-standing high temperatures, graphite plates offer good heat transfer characteristics in combination with low thermal expansion and high-pressure operation.
PHE plates
Some of the prevalent applications of PHEs with graphite plates include heating of pickling baths, surface treatment of metals, hydrochloric acid production, and flue-gas waste-heat recovery.
Minex plate heat exchanger
The design of the Minex PHE is a 'miniaturization' of the conventional plate-and-frame heat exchanger. The end frames and carrying or guide bars are eliminated, and tightening bolts are located with the outline dimensions of the heat transfer plates instead. This configuration makes it possible to combine a compact design with the PHE flexibility options of manual cleaning and ease of surface are expansion or reduction to meet changing application requirements. However, because only tightening bolts are used to keep the gasketed plate pack together, the small and compact Minex PHE is generally used in heat transfer duties where the required capacity is also very small. This type of PHE is intended for general-purpose, fixed load applications, and constitutes an attractive alternative to larger exchangers.
Plate heat exchanger
Several other types and modifications of PHEs are available commercially, and the above selections represent the more prominent sampling. While these new developments have overcome many of the deficiencies of the traditional plate-and-frame heat exchangers, the newer models that discard gaskets lose the advantages of easy cleaning and flexibility of adjusting or altering heat exchanger area. Nevertheless, the family of PHEs available has enlarged considerably with these new developments, which provides more competitive functional and cost attributes, and expands their domain in modern industrial applications.
Since its inception in the 1920s for commercial usage, primarily in the dairy industry, the traditional plate-and-frame heat exchanger has evolved over the last several decades and variant models of PHEs have been developed. Although some of these modifications have been driven by new strategies for making more compact equipment, others have focused on overcoming some of the disadvantages and expanding the applications spectrum of PHEs. This evolution has typically manifested either as an altered structure or construction of the PHE or as variations in the plate surfaces corrugation patterns. In the former category during the last several decades, brazed, semi-welded, fully welded, wide-gap, double-wall PHEs, among many others, where the gasketing has been eliminated, have been developed.
Brazed plate heat exchanger
The brazed plate heat exchanger (BPHE) is essentially made up of a pack of thin corrugated stainless steel plates that are brazed together using copper as a brazing material to form a self-contained unit. Brazing eliminates the need of either frames or gaskets and results in a very compact exchanger. Also, instead of copper, where its use presents a compatibility problem with a process stream (e.g. ammonia), nickel or some other brazing material is used.
Because the plates are brazed to each other and there are no frames or gaskets, BHEs can handle higher pressure and temperatures than plate-and-frame heat exchangers, e.g. situations with pressure up to 30 bar and temperatures up to 400C. They are also characterized by very low weight due to the absence of frames. However, the exchanger length is usually less than 1m because of the brazing furnace size limitation, where their capacity is restricted to a single BPHE unit. Typical applications include heating and cooling (sensible or with phase change) in the process industry, evaporation and condensation in refrigeration systems, and other HVAC installations.
Semi-welded plate heat exchanger
By welding heat exchanger plates in pairs, to make what are commercially called twin plates, a semi-welded PHE is configured by assembing them in a plate-and-frame pack with gaskets only in the plate channels that handle the alternate fluid stream. This design is especially useful for handling relatively corrosive media, which flows in the welded twin-plate channels. The only gaskets in contact with this medium are two circular porthole gaskets between the welded plate pairs that are typically available in highly resistant elastomer and non-elastomer materials. The channels containing the non-corrosive, non-aggressive, secondary heating or cooling fluid medium flows are sealed using traditional elastomer gaskets.
The semi-welded PHEs can withstand pressures up to 30 bar on the welded twin-plate fluid side, though it should be pointed out that frames are still needed to hold the plate pack. The relatively higher pressure operation extends its applications to include evaporation and condensation in refrigeration and air-conditioning systems, among others.
Fully welded plate heat exchanger
The fully welded PHE is a gasket-free version, where a completely welded plate pack is bolted between the two end plates in a conventional frame. By joining the plates at their edges and eliminating the gaskets, the structural integrity of the plate pack is significantly enhanced, and so are the operating temperature and pressure limits of the gasketed PHEs. The laser welds are applied in two spatial dimensions along the edges in the plane of the plates. This allows the plate pack to expand and contract along its length as temperature and pressure changes take place, thereby making the pack more fatigue resistant. Consequently, they are particularly attractive for applications where the heat transfer for thermal processing undergoes rapid changes in temperature and /or pressure. However, fully welded PHEs, unlike gasketed and semi-welded models, lose the flexibility of either expanding or decreasing their surface area by adding or removing plates for meeting varing heat load requirements. Also, they cannot be cleaned readily by mechanical methods, and only chemical cleaning methods can be employed.
The fully welded PHEs are intended for thermal processes with severe duty requirements that often involve handling of highly aggressive or corrosive fluids. They can withstand temperatures up to 350C and pressure up to 40 bar. Typical applications included exchangers for desuperheating in heat recovery systems, refrigeration interchangers, and heaters of organic chemicals such as solvents, vegetable oils, steam, and batch reactors, among others.
Wide-gap plate heat exchanger
PHEs with wide-gap plate packs provide larger free-flow area channels for handling fluids containing fibres or coarse particles and high-viscous fluids, which normally clog or cannot be satisfactorily treated in other types of PHEs and still retain some of enhanced thermal-hydraulic performance characteristics. The plate-surface corrugations and gaskets are designed such that in the inter-plate channels the flow cross-section has a maximum gap of up to 16mm. The plate corrugations still provide an effective area enlargement and promote swirl flows to effect high heat transfer coefficients; the wider flow gap, however, tends to reduce the pressure drop penalty.
Typical applications include heating of raw, limed, and mixed juice in sugar mills, cooling and blenching of plant filtrate in pulp and paper mills, and sanitization of fibrous food product slurries.
Double-wall plate heat exchangers
The double-wall PHE is designed for use with either a reacting media or when product contamination between the two fluid steams must be avoided 'fail safe'. Double plates, sealed by conventional gaskets, replace the single plate that normally separates the two fluid media. In the event of the media reacting with the corroding the surface of the double-wall plates, the leakage is directed in the passage between the double plates. This essentially minimizes the possiblity of inter-fluid contamination, and the leakage also becomes easily visible on the outside of the heat exchanger. The more common applications of this type of PHE include, among others, heating and cooling of drinking water, pharmaceutical media, lubricating oil, and transformer oil.
Diabon graphite plate heat exchanger
The Diabon graphite PHE employs graphite plates which are developed for thermal processing of media that is normally too corrosive for plates made of exotic metals and alloys. The Diabon F100, or NSI graphite, is a composite material made up of graphite and fluoroplastics. The material is compressed into the shape of surface corrugated plates, and the formed plates are fitted with thin, flat, corrosion-resistant gaskets. Besides being corrosion resistant and capable of with-standing high temperatures, graphite plates offer good heat transfer characteristics in combination with low thermal expansion and high-pressure operation.
Some of the prevalent applications of PHEs with graphite plates include heating of pickling baths, surface treatment of metals, hydrochloric acid production, and flue-gas waste-heat recovery.
Minex plate heat exchanger
The design of the Minex PHE is a 'miniaturization' of the conventional plate-and-frame heat exchanger. The end frames and carrying or guide bars are eliminated, and tightening bolts are located with the outline dimensions of the heat transfer plates instead. This configuration makes it possible to combine a compact design with the PHE flexibility options of manual cleaning and ease of surface are expansion or reduction to meet changing application requirements. However, because only tightening bolts are used to keep the gasketed plate pack together, the small and compact Minex PHE is generally used in heat transfer duties where the required capacity is also very small. This type of PHE is intended for general-purpose, fixed load applications, and constitutes an attractive alternative to larger exchangers.
Several other types and modifications of PHEs are available commercially, and the above selections represent the more prominent sampling. While these new developments have overcome many of the deficiencies of the traditional plate-and-frame heat exchangers, the newer models that discard gaskets lose the advantages of easy cleaning and flexibility of adjusting or altering heat exchanger area. Nevertheless, the family of PHEs available has enlarged considerably with these new developments, which provides more competitive functional and cost attributes, and expands their domain in modern industrial applications.
Monday, March 13, 2017
Global Growth in HE Replacement
Phe Advantages &Disadvantages
Saturday, March 11, 2017
Thursday, March 9, 2017
Shell and Plate Heat Exchanger: 1+1=1
http://www.hfm-phe.com/products/heat-exchanger.html
In the heat exchanger market, the two main types are shell-and-tube heat exchangers and plate heat exchangers. For each of these two types, some advantages and disadvantages are well known in the applications.
Plate heat exchanger, although its low fouling, compact in size, close approach temps makes it prevailing in many industries, the limitations of low pressure, low temperature and gasket necessary are all headache in some tough working circumstance.
Shell-and-tube heat exchanger, although it suits for the high pressure, high temperature working environment and gasket non-necessary, its large size and weight, and easy foiling are make it capital wasting and time consuming either in construction or maintenance.
With the tech of heat exchanger developing, shell-and-plate heat exchanger combines the two types advantages perfectly. The most obvious advantages of this type heat exchanger you can summarize from those two types above.
+ high pressure
+ high temperature
+ no gaskets
+ compact
+ low fouling
+ close approach temps
According to the market research, shell-and-plate heat exchanger has been applied to many industries already and its advantage is more and more compelling. This type of heat exchanger is replacing the above two types in the next few years across many industries.
In the heat exchanger market, the two main types are shell-and-tube heat exchangers and plate heat exchangers. For each of these two types, some advantages and disadvantages are well known in the applications.
Plate heat exchanger, although its low fouling, compact in size, close approach temps makes it prevailing in many industries, the limitations of low pressure, low temperature and gasket necessary are all headache in some tough working circumstance.
With the tech of heat exchanger developing, shell-and-plate heat exchanger combines the two types advantages perfectly. The most obvious advantages of this type heat exchanger you can summarize from those two types above.
+ high pressure
+ high temperature
+ no gaskets
+ compact
+ low fouling
+ close approach temps
According to the market research, shell-and-plate heat exchanger has been applied to many industries already and its advantage is more and more compelling. This type of heat exchanger is replacing the above two types in the next few years across many industries.
Wednesday, March 8, 2017
Deliver High Efficiency &Best Quality
Efficient heat transfer
Plate heat exchangers are designed to optimize heat transfer, because the corrugated plates provide by far the greatest surface area through which the heat can be drawn from one gas or liquid to the other. The units also have a flexible design and are easy to service and maintain.
Gasketed plate heat exchangers benefits:
- Precision heat transfer - closer approach temperature, true counter current flow, 80-90% less hold-up volume
- Low overall cost - low capital investment, reduced installation costs, limited maintenance and operating costs
- Maximum reliability - less fouling, stress, wear and corrosion
- Environmentally responsible - minimum energy consumption for maximum process effect, reduced cleaning
- Easy to expand capacity - simply add or remove plates on the existing frame
The product range is extremely wide and is used in duties for heating, cooling, heat recovery, evaporation and condensation in industries ranging from HVAC, refrigeration, engine cooling, dairy and food to heavier processes like chemical processing, oil production and power generation.
Classification of heat exchangers depending on their applications
Just find a flow chart to share with you.
Tuesday, March 7, 2017
Sunday, March 5, 2017
Plate Heat Exchanger Applications
Key Industries for Plate and Frame Heat Exchangers
Food and Beverage
A second area of the food and beverage industry in which these specific exchangers operate is brewing, where they are used for wort boiling and cooling, as well as beer cooling. The third area they are used is in the production of soft drinks. The exchangers serve the purposes of water heating, energy drink pasteurization, sugar dissolving, and syrup pasteurization. And finally, within this industry, plate and frame heat exchangers play a part in fruit and juice processing.
Ethanol and Corn Processing
Another major area where plate and frame heat exchangers operate is the ethanol and corn processing industry. Particularly wide gap heat exchangers are used in mash cooling, beer/mash or beer/stillage interchange, fermenter cooling, and yeast propagation cooling. In addition, if the fluid being heated is weighed down by solids (e.g., beer), these specific exchangers can serve as vapor condensers.
Industrial Energy and Power Plants
Within power plants, proper safety relies on the cooling of oils, bearings, and rotor blades of diesel or gas motors; these same parts in steam or gas turbines need to be cooled, as well. A wide range of plate heat exchangers are produced in order to fuel this cooling. The exchangers also help make power generation more efficient.
Free Cooling/HVAC
Plate and frame heat exchangers also play a major role in ventilation. PHE’s take advantage of free cooling or chiller bypass. In turn, this means that water from cooling towers is able to bypass the chiller and flow directly into the heat exchanger. As a result, the number of hours the mechanical chiller operates decreases. This is beneficial in that some buildings, such as hospitals and skyscrapers, need cooling all year around regardless of the weather.
Marine
The marine industry relies heavily on plate and frame heat exchangers, as PHEs help maintain the primary engine oil cooler and the freshwater cooler. These exchangers serve other purposes on ships, too, as they help with tap-water production systems and HVAC systems. The main reasons PHEs are chosen over shell-and-tube exchangers is that they are much more efficient and compact, making them more suitable for the marine industry.
Plate and Frame Heat Exchanger Market is expected to drive product significance over the forecast period
Sherry James
The global plate and frame heat exchanger market is expected to reach USD 5.99 billion by 2022, according to a new report by Grand View Research, Inc. Growing awareness towards energy efficiency coupled with construction space constraints is expected to drive the market over the forecast period. Surging demand for thermal management in district heating applications is expected to drive product significance in commercial and residential sectors over the long term.
Technological advancements along with surging requirement for heat recovery utilities in chemical, food & beverage and HVAC sectors is expected to steer plate and frame heat exchangers market growth. Growing energy efficient utilities need along with expanding power generation infrastructure in economies including India, Vietnam, China and Thailand is anticipated to drive market growth.
Welded systems emerged as the leading product segment and accounted for over 20% of total market revenue in 2014. Owing to its widespread use in oil & gas, automobile, pharmaceuticals, petrochemicals and paper manufacturing industries, the segment is expected to gain share over other counterparts over the next seven years. This product segment is anticipated to increase penetration in oil & gas industry owing to reduced chance of leakage and enhanced corrosion resistance.
- Global plate & frame heat exchanger market was worth USD 3.41 billion in 2014 and is expected to reach USD 5.99 billion by 2022, at a CAGR of 7.3% from 2015 to 2022
- Chemicals emerged as the leading end-use industry with demand share estimated at 23.9% in 2014. Growing chemical & petrochemical industry particularly in the U.S., Germany and China is anticipated to impact plate & frame heat exchangers demand positively over the next seven years. HVAC & refrigeration is expected to witness the highest growth of 8.0% from 2015 to 2022.
- Europe was the leading regional market and accounted for 37.5% of global revenue in 2014. Increasing product use across refineries and chemical industries owing to stringent government regulations have been the major factor contributing for high penetration.
- Asia Pacific is expected to witness the highest gains in its market size over the forecast period. The region is expected to grow at an estimated CAGR of 8.4% from 2015 to 2022.
- The global industry is moderately fragmented with presence of large number participants across the globe. Major companies involved in manufacturing & distribution of plate heat exchangers include AIC S.A., API Heat Transfer, Danfoss, Fischer Maschinen-und Apparatebau AG, Kelvion, Guntner, Hisaka Works, Alfa Laval, Kaori Heat Treatment and SWEP International.
Saturday, March 4, 2017
How to do Maintenance of Marine Heat Exchangers on Ships?
http://www.hfm-phe.com/products/replacement-part.html
Marine heat exchangers play an important role of removing the heat produced by a running machinery to ensure smooth functioning of the equipment. It is also necessary to enhance the heat exchanging ability which would reduce after certain amount of time of operation.
Marine heat exchangers play an important role of removing the heat produced by a running machinery to ensure smooth functioning of the equipment. It is also necessary to enhance the heat exchanging ability which would reduce after certain amount of time of operation.
The cooling medium used in the heat exchangers depends on the medium used, including other factors.
Along with mediums such as fresh water, air and oil, sea water is also used abundantly in marine heat exchangers as an important cooling source. However, because of the presence of dissolved salts in sea water, corrosion and scale deposits is a common condition in heat exchangers. Maintenance of marine heat exchangers is therefore necessary at regular intervals of time to prevent reduction of heat transfer or failure of equipment.
The method of maintenance used depends on the type of heat exchanger and type of deposits, but the general aim of every heat exchanger maintenance procedure remains the same – cleaning of heat transfer surfaces to prevent any kind of obstruction in the flow process.
The main reason for fouling of heat exchanger surface is the increase in temperature difference between the two fluids and change in pressure. But it is the sea water side of the heat exchanger which suffers the most as a result of corrosion and scale deposits.
Methods of marine heat exchanger maintenance
Note: Prior to Maintenance, isolate the heat exchanger by shutting off the line valves for both medium and media; and drain the remaining liquid using the drain cock. The Vent must be open to ensure everything is drained from the heat exchanger.
- If the deposits on the heat exchanger are not so hard, then they can be removed using a wire brush.
- If the deposits are stubborn, chemical cleaning should be used by emersion of the part in chemical solution.
- Depending on the type of the heat exchanger, there are tools provided by the manufacturers for the cleaning purpose. For e.g. there are special tools for cleaning shell and tube type heat exchangers.
- Once the cleaning is done, the heat exchanger must be flushed with fresh water to remove any remaining chemical or dirt from the surface.
- In sea water cooled heat exchanger, anodes are fitted on the cover to prevent it from galvanic corrosion. Anodes must be checked and changed if required.
- Always renew the cover gasket if it is damaged during opening of heat exchanger.
- In oil coolers and heaters, fouling can take place on the outside of the tubes as well. This can be removed by chemical flushing.
In plate type heat exchangers, the stack of plates is removed to expose the surface. The plate surface is then cleaned with brush or by the methods suggested by the manufacturer. (Sharp tools should be avoided). Cleaning should be done in such a way that it does not damage the plate seals. However, if a replacement of the seal is necessary, it must be done before putting the plates back.
While tightening the plates together, care must be taken for even tightening of all the exchanger studs and bolts or else leak will occur.
Excessive corrosion of the heat exchanger surface can also lead to perforation of the surface, resulting in mixing of one liquid with another. Minor leakage detection is not easy especially when the header tanks are automatically toped or if there is no proper manual record maintained. However, major leakages can be easily detected as a result of sudden loss of lubricating oil or jacket water. Low level alarms are also useful in detecting major leaks.
Another way to prevent mixing of two liquids because of perforation is by keeping the sea water at a pressure lower than the jacket water or any other liquid used. This reduces the risk of sea water entering into other mediums.
How leaks are detected?
Shell and tube type heat exchangers
If it's a shell and tube type heat exchanger, leaks can be detected by following the procedure below:
Isolating the heat exchanger from the system and draining the sea water
Removing the end covers or headers to expose the tubes or plates
If the surface is clean and dry, inspection of the liquid flow is made from around the tube ends and through the perforations. However, in large coolers it is difficult to get the coolers extremely dry to visualize any perforation. In such cases special fluorescent dye is added to the shell side of the cooler. The dye glows when an ultraviolet light is shone on the tube, revealing the tube leaks.
Plate Type Heat Exchangers
Similarly in plate type heat exchangers, visual inspection or fluorescent dye penetrate is used to find any defeats. (Dye penetrate is used on one side, followed by ultraviolet rays on the other side)
Air coolers
When it comes to air coolers, leakages can be dangerous as they allow sea water to pass through to the engine cylinder. This can lead to formation of scales on air inlet valves’ spindle.
In such cases, location of the leaks can be detected by allowing low air pressure on the air side and checking the flooded sea water side for air bubbles. For better results, soapy water can be used for sea water side flooding.
Apart from the above mentioned methods, there are other ways as well to carry of marine heat exchanger maintenance. However, these are the most commonly used ones.
Do you know any other ways?
Seeking the optimal design of a typical plate heat exchanger (PHE)
http://www.hfm-phe.com/products/replacement-part.html
Auther: A.G. Kanaris, A.A. Mouza and S.V. Paras
The need for designing process equipment that complies with the principles of economic and ecological sustainability acted as a driving force towards the evolution in the design of plate heat exchangers (PHE). Because of their compactness, close temperature approach and ease on inspection and cleaning (Shah & Wanniarachchi, 1991), PHEs are used in process and power industries for a wide range of temperatures. The plates of these PHE comprise some form of nearsinusoidal corrugations in a herringbone pattern (Fig. 1). When two of these plates are arranged and placed abutting, a channel with complicated passages is formed. As expected, the fluid flow inside a passage of this channel undergoes a series of periodic changes in flow direction, a kind of flow that augments heat transfer, while on the other hand it induces a significant resistance to the flow.
Previous work conducted in this Laboratory (Kanaris et al., 2006) has
proved that CFD is a reliable tool for simulating the operation of a
commercial PHE. Thus, in place of expensive and time consuming
laboratory experiments, CFD simulations can be effectively used for
predicting the performance of this type of equipment, which is
strongly affected by the geometry of the conduit. Thus, the geometrical
parameters of the conduit (Fig. 2) are used for creating a series of
computational domains, based on a design-of-experiments (DOE) method, to optimize the
PHE performance.
These conceptual PHEs have been numerically studied (in terms of heat transfer and fluid flow analysis), using a previously validated commercial CFD code (ANSYS CFX® 10) (Kanaris et al., 2006). To quest for the optimal design of the corrugated surface, an objective function is formulated, as a tradeoff between heat transfer and pressure drop, using a weighting factor to account for the relative significance of friction losses to heat recovery (i.e., electric energy vs. thermal energy). Five dimensionless groups are selected as design variables for the simulations, namely:
• the blockage ratio (BR=d/H) that expresses the percentage of the entrance of the channel 'blocked' with corrugations,
• the channel aspect ratio (ChanAR=H/W); a measure of how narrow the channel is,
• the corrugation aspect ratio (CorAR=d/z); a measure of the obtuseness of the corrugation,
• the sine of twice the angle of attack (sin2θ) and
• the Reynolds number, Re, defined as: = h uD Re ρ μ, where Dh the hydraulic diameter of the conduit and u is the mean entrance velocity.
Box-Behnken design was selected for the design variables in order to construct the response surface. The calculated values of the objective function are used to create a quadratic model to be optimized using response surface methodology (RSM) (Myers & Montgomery, 2002).
A typical plot with results, covering
a Re number range from
500 to 6000, is presented in Fig.
3, for a typical weighting factor.
Apparently, the objective is to
construct flow passages that enhance
secondary flow inside the
furrows, which in turn augments
heat transfer rates. For low values
of the weighting factor (i.e.
when pumping cost is low), the
optimal performance of the PHE
is achieved for the shortest distance
between the plates and for
less obtuse corrugations. As Re
increases, the PHE performance
can be improved for lower channel
aspect ratios (i.e., wider
channels) and for higher values
of the angle of attack. Nevertheless,
if the weighting factor is
high, i.e., the pumping cost is
high, the optimal design of a
PHE, as shown in Fig. 3, dictates greater distances between the plates and less sharp corrugations,
as Re increases.
Auther: A.G. Kanaris, A.A. Mouza and S.V. Paras
The need for designing process equipment that complies with the principles of economic and ecological sustainability acted as a driving force towards the evolution in the design of plate heat exchangers (PHE). Because of their compactness, close temperature approach and ease on inspection and cleaning (Shah & Wanniarachchi, 1991), PHEs are used in process and power industries for a wide range of temperatures. The plates of these PHE comprise some form of nearsinusoidal corrugations in a herringbone pattern (Fig. 1). When two of these plates are arranged and placed abutting, a channel with complicated passages is formed. As expected, the fluid flow inside a passage of this channel undergoes a series of periodic changes in flow direction, a kind of flow that augments heat transfer, while on the other hand it induces a significant resistance to the flow.
Previous work conducted in this Laboratory (Kanaris et al., 2006) has
proved that CFD is a reliable tool for simulating the operation of a
commercial PHE. Thus, in place of expensive and time consuming
laboratory experiments, CFD simulations can be effectively used for
predicting the performance of this type of equipment, which is
strongly affected by the geometry of the conduit. Thus, the geometrical
parameters of the conduit (Fig. 2) are used for creating a series of
computational domains, based on a design-of-experiments (DOE) method, to optimize the
PHE performance.These conceptual PHEs have been numerically studied (in terms of heat transfer and fluid flow analysis), using a previously validated commercial CFD code (ANSYS CFX® 10) (Kanaris et al., 2006). To quest for the optimal design of the corrugated surface, an objective function is formulated, as a tradeoff between heat transfer and pressure drop, using a weighting factor to account for the relative significance of friction losses to heat recovery (i.e., electric energy vs. thermal energy). Five dimensionless groups are selected as design variables for the simulations, namely:
• the blockage ratio (BR=d/H) that expresses the percentage of the entrance of the channel 'blocked' with corrugations,
• the channel aspect ratio (ChanAR=H/W); a measure of how narrow the channel is,
• the corrugation aspect ratio (CorAR=d/z); a measure of the obtuseness of the corrugation,
• the sine of twice the angle of attack (sin2θ) and
• the Reynolds number, Re, defined as: = h uD Re ρ μ, where Dh the hydraulic diameter of the conduit and u is the mean entrance velocity.
Box-Behnken design was selected for the design variables in order to construct the response surface. The calculated values of the objective function are used to create a quadratic model to be optimized using response surface methodology (RSM) (Myers & Montgomery, 2002).
A typical plot with results, covering
a Re number range from
500 to 6000, is presented in Fig.
3, for a typical weighting factor.
Apparently, the objective is to
construct flow passages that enhance
secondary flow inside the
furrows, which in turn augments
heat transfer rates. For low values
of the weighting factor (i.e.
when pumping cost is low), the
optimal performance of the PHE
is achieved for the shortest distance
between the plates and for
less obtuse corrugations. As Re
increases, the PHE performance
can be improved for lower channel
aspect ratios (i.e., wider
channels) and for higher values
of the angle of attack. Nevertheless,
if the weighting factor is
high, i.e., the pumping cost is
high, the optimal design of a
PHE, as shown in Fig. 3, dictates greater distances between the plates and less sharp corrugations,
as Re increases.
Thursday, March 2, 2017
Tranter PHE Products
Hofmann is serving from design, type selection, construction, manufacture to replacement supplement for all the Tranter plate heat exchangers. Following models list is for your reference.
If any of them you are interested with, please feel free to contact service@hfm-phe.com.
Or visit our product page http://www.hfm-phe.com/product/tranter-gaskets-plates.html for more info.
If any of them you are interested with, please feel free to contact service@hfm-phe.com.
Or visit our product page http://www.hfm-phe.com/product/tranter-gaskets-plates.html for more info.
| Model | Model | Model |
| Tranter 11T | Tranter GX091 | Tranter HX180 |
| Tranter GCD006 | Tranter GX100 | Tranter HX25 |
| Tranter GCD012 | Tranter GX12 | Tranter HX50 |
| Tranter GCD030 | Tranter GX18 | Tranter HX85 |
| Tranter GCD054 | Tranter GX26 | Tranter HXD012 |
| Tranter GCD055 | Tranter GX42 | Tranter HXD025 |
| Tranter GCD065 | Tranter GX51 | Tranter HXD050 |
| Tranter GCP026 | Tranter GX64 | Tranter HXD085 |
| Tranter GCP030 | Tranter GX85 | Tranter HXD145 |
| Tranter GCP051 | Tranter GX91 | Tranter HXD180 |
| Tranter GCP060 | Tranter GXD012 | Tranter HXP050 |
| Tranter GF057 | Tranter GXD018 | Tranter S3 |
| Tranter GF097 | Tranter GXD026 | Tranter S8 |
| Tranter GF187 | Tranter GXD037 | Tranter TW10 |
| Tranter GFP030 | Tranter GXD042 | Tranter TW18 |
| Tranter GFP050 | Tranter GXD051 | Tranter TW5 |
| Tranter GFP057 | Tranter GXD060 | Tranter UX01 |
| Tranter GFP080 | Tranter GXD064 | Tranter UX05 |
| Tranter GFP097 | Tranter GXD085 | Tranter UX066 |
| Tranter GFP100 | Tranter GXD091 | Tranter UX06T |
| Tranter GFP180 | Tranter GXD100 | Tranter UX10 |
| Tranter GFP187 | Tranter GXD140 | Tranter UX20 |
| Tranter GLD013 | Tranter GXD145 | Tranter UX40 |
| Tranter GLP013 | Tranter GXD180 | Tranter UX801 |
| Tranter GM138 | Tranter GXP018 | Tranter UX81 |
| Tranter GM257 | Tranter GXP026 | Tranter UXP005 |
| Tranter GM276 | Tranter GXP037 | Tranter UXP010 |
| Tranter GM56 | Tranter GXP042 | Tranter UXP060 |
| Tranter GM59 | Tranter GXP051 | Tranter UXP200 |
| Tranter GX012 | Tranter GXP118 | Tranter UXP400 |
| Tranter GX018 | Tranter HX012 | Tranter UXP801 |
| Tranter GX026 | Tranter HX025 | Tranter UXP900 |
| Tranter GX042 | Tranter HX050 | |
| Tranter GX051 | Tranter HX085 | |
| Tranter GX064 | Tranter HX12 |
Subscribe to:
Posts (Atom)