OHMS ENTERPRISESubsidiary of AIT Synergy Ventures SDN BHD

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Welcome to OHMS ENTERPRISECost effective, reliable service and quality spare parts for plate heat exchangers worldwide

OHMS ENTERPRISE is specialized in servicing all makes of plate heat exchangers. For example Alfa-Laval, APV, Cetetherm, Pasilac, Tranter, Hisaka, Fischer, Schmidt-Bretten, Vicarb, GEA and Swep.

We also offer a wide range of top quality gaskets for various plates, as well as high quality plates for heat exchangers.

OHMS ENTERPRISE has built a reputation among our customers based upon� Quality� On-time delivery� Competitive prices

Our business idea is built upon that our customers do not necessarily have to pay OEM prices to obtain quality and performance.

Customers and end-users of OHMS ENTERPRISE range from smaller companies to global corporations.

Plate Heat ExchangersPlate heat exchangers offer better economy, maximum efficiency and easy maintenance.

The plate heat exchanger is widely recognized today as the most economical and efficient type of heat exchanger on the market. With its low cost, flexibility, easy maintenance, and high thermal efficiency it is unmatched by any type of heat exchanger. The key to plate heat exchanger's efficiency lies in its plates. With corrugation patterns that induce turbulent flow, it not only achieves unmatched efficiency it also creates a self-cleaning effect thereby reducing fouling. OHMS ENTERPRISE plate corrugations are available in different pressing depths and patterns depending on the application. All are designed to achieve turbulence across the entire heat transfer area in order to get the highest possible heat transfer coefficients with the lowest possible pressure drop and allow for close temperature approaches. Consequently this means smaller heat transfer area, smaller heat exchangers and sometimes even less heat exchangers.

Plate heat exchanger consists of a number of gasketed plates which are fixed between a top carrying bar and a lower guide bar. The plates are compressed by means of tie bolts between a stationaryframe part (called the head) and a movable frame part (called the follower). Fluids enter the plate heat exchanger through frame connections and are distributed to plates. The flow to alternatepassages between the plates is controlled by alternating the placement of gaskets.

The plate heat exchanger is designed with either single-pass or multi-pass flow, depending on the duty. For most duties single-pass is suitable and often the preferred solution as it keeps all connections on the stationary frame part and consequently makes disassembly easier. Multi-Pass however, is required when flow rates are low or when approach temperatures are close. Other factors such as building ceiling height or space limitations for handling of large plates often leads to the decision to use multi-pass and thereby more and smaller plates.

On all OHMS ENTERPRISE plate designs, gaskets provide a peripheral seal while separating product flows. The space between gaskets is vented to the atmosphere, eliminating cross contamination of fluids. This is an ideal feature where product contamination cannot be tolerated.

Easy to Remove and CleanYou simply remove the tie bolts and slide back the movable frame part. Now the plate pack can be inspected, pressure cleaned, or removed for refurbishment if required.

ExpandableA very significant feature of the plate heat exchanger is that it is expandable. Increasing your heat transfer requirements means simply adding plates instead of buying a new heat exchanger, saving time and money.

High EfficiencyBecause of the pressed patterns in the plates and the relative narrow gaps, very high turbulence is achieved at relative low fluid velocity. This combined with counter directional flow results in very high heat transfer coefficients.

Compact SizeAs a result of the high efficiency, less heat transfer area is required, resulting in a much smaller heat exchanger than would be needed for the same duty using other types of heat exchangers. Typically a plate heat exchanger requires between 20-40% of the space required by a tube & shell heat exchanger.

Advantages

Close Approach TemperatureThe same features that give the plate heat exchanger its high efficiency also makes it possible to reach close approach temperatures which is particularly important in heat recovery and regeneration applications. Approach temperatures of 0.5ºC is possible.

Multiple Duties in a Single UnitThe plate heat exchanger can be built in sections, separated with simple divider plates or more complicated divider frames with additional connections. This makes it possible to heat, regenerate, and cool a fluid in one heat exchanger or heat or cool multiple fluids with the same cooling or heating source.

Avoid cross contaminationEach medium is individually gasketed and as the space between the gaskets is vented to the atmosphere, cross contamination of fluids is eliminated.

Less FoulingVery high turbulence is achieved as a result of the pattern of the plates, the many contact points, and the narrow gap between the plates. This combined with the smooth plate surface reduces fouling considerably compared to other types of heat exchangers.

Lower CostsHigh heat transfer coefficients mean less heat transfer area and smaller heat exchangers, and sometimes even less heat exchanger.

Flow principle of Plate and Frame Heat Exchangers:

Plate and frame heat exchangers consists of a pack of thin metal plates with openings for the passage of the fluids. The plates are corrugated which means that each pair of adjacent plates in the heat exchanger forms a channel. Every second channel is open to the same fluid. Between each pair of plates there is a rubber gasket, which prevents the fluids from mixing and from leaking to the surroundings.

When the media enters the plate and frame heat exchanger via the connections in the frame, it's directed through alternate channels by the gasket arrangement. The warm fluid flows through every other channel and the cold fluid through the channels in between. Heat is thus transferred from the warm fluid to the colder fluid via the dividing wall, i.e. the plate material. The corrugations support the plates against differential pressure and create a turbulent flow in the channels. In turn, the turbulent flow provides high heat transfer efficiency, making the plate heat exchanger very compact compared with the traditional shell-and-tube heat exchanger.

REPLACEMENT PARTS

OHMS ENTERPRISE offers a wide range of heat exchanger plates. Bykeeping the most common plates in stock, we are able to offer immediate delivery on almost any plate requests. All OHMS ENTERPRISE plates are fully interchangeable with those made by OEM´s. The range of plates is continuously updated. Standard material for the plates is SS316, but we also offer

� SS304 � Titanium� Hastelloy � SMO254

Plates

Gaskets OHMS ENTERPRISE supplies an extensive range of gaskets for various types of plate heat exchangers. Among these are Alfa-Laval, APV, Cetetherm, Pasilac,Tranter, Hisaka, Fischer, Schmidt-Bretten, Vicarb, GEA and Swep. By keeping the most common types in stock we are able to offer immediate delivery upon requests. The assortment of gaskets is regularly updated.

Standard materialsFDA-NBR FDA-EPDM IND-EPDM FDA-NBR - OHMS ENTERPRISE FDA-NBR is peroxide cured nitrile rubber (NBR). The rubber is used for applications together with fatty food and industrial applications. FDA-NBR has replaced the HT-NBR for industrial applications, because they are practically equal in almost all applications. The material has resistance to nitric acid solutions.

FDA-EPDM - OHMS ENTERPRISE FDA-EPDM is a peroxide cured ethylene-propylene rubber. The material has good resistance to steam. It is standard material for aqueous food applications.

IND-EPDM - OHMS ENTERPRISE Industrial EPDM (HT) is a peroxide cured ethylene-propylene rubber for high temperature applications. It is standard material for industrial aqueous applications.

Gaskets made of other material are available upon request. Among these are: VITON G IND-HNBR FDA-HNBR HYPALON AL-EPDM NEOPRENE

VITON G - A material which has excellent resistance towards concentrated acids, even better than the former Viton B. The Viton G is a peroxide cured fluorocarbon rubber (FKM).

IND-HNBR - OHMS ENTERPRISE Industrial HNBR is a peroxide cured hydrogenated nitrile rubber, specially developed for crude oil PHE applications, where demands for resistance towards the combination of oil, sulphides and amines are the highest. The material also meets the temperature gap in between nitrile rubber (NBR) and FKM for most oil applications.

FDA-HNBR - OHMS ENTERPRISE FDA-HNBR is a peroxide cured hydrogenated nitrile rubber, specially developed for high temperature food applications. The properties are very close to the industrial HNBR, with the exception of slightly less heat resistance and less sulphide resistance. HYPALON AL-EPDMNEOPRENE

- Rubber materials used for gaskets are based upon a polymer which is blended with additives to give each formula unique properties. A rubber material tailor-made for a specific end use is seldom appropriate for use in other applications. For technically more advanced products, specially developed materials meet specific requirements The most important ingredient is the polymer, which may be from 15 to 70% (usually around 50%) by weight of the final mix.

A typical formulation is based upon:Polymer 50%Fillers 40%Softener 5%Activators 2%Curative 1%Accelerators 1%Antioxidant 1%

Rubber materials

Rubber materials from ours are specifically selected and designed for PHE applications.

LifetimeGradually all rubber materials age. This means they loose their original properties, and makes them unsuitable for further use. The rate of ageing depends on the original quality of the product and the environment. Liquids and chemicals, their concentration and temperature affect the degradation process. Also variation in temperature and pressure influence the performance and lifetime of a rubber product.

Chemical resistanceEach rubber material has its unique resistance towards various chemicals. Polymer and additives are carefully selected to meet different needs and facilitate optimal performance.

High temperatureAt high temperatures, the rubber material will be attacked faster by surrounding chemicals and oxygen in the atmosphere. The oxidation process will either make the rubber harder or make it softer, or even a combination of both. Therefore the selected type of rubber material must be resistant to the temperature in the application in order to maintain good performance and meet stated lifetime.

Low temperatureAt low temperatures stiffness increases, and elasticity decreases. This change influences the sealing force of the gaskets. All rubber materials have a certain lowest temperature that has to be exceeded to be able to perform well enough as a gasket.

Food applicationsFor food applications there are demands according to national standards. The leading framework for PHE gaskets is the FDA standard (Food and Drug Administration, USA). This standard regulates which additives are allowed to be used in the rubber and to which extent. It also sets demands on what tests have to be done and approved results to ensure compliance with the standards.