Applications

Hydraulic Oil Cooler

Equipment that incorporates a hydraulic power pack typically needs a hydraulic oil cooler to maintain temperature of the hydraulic oil below a specified limit.

  • Increase in the temperature of hydraulic oil above this limit can result in

  • Reduction in viscosity causing reduced system performance
  • Damage to seals causing leakages
  • Oil degradation resulting in reduced service life of hydraulic oil

Plate Type Heat Exchanger
Plate Type Heat Exchanger
Plate Type Heat Exchanger

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Lube Oil Cooler

Lubricating oil reduces friction between moving mechanical parts and also removes heat from the components. As a result, the oil becomes hot. This heat is removed from the lube oil by a cooler to prevent both breakdown of the oil and damage to the mechanical components it serves. The lube oil temperature must be maintained within a specific operating band to ensure optimum equipment performance.

Lube oil coolers are designed based on the customer specifications. Designs are available as single coolers or duplex coolers with change over valves.

Coolers can be designed according to good engineering practice or as per TEMA and ASME codes based on customer requirements.

Lube Oil Cooler
Lube Oil Cooler
Lube Oil Cooler

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Marine Cooler

Large size engines are used in ships for propulsion and electricity generation. These large engines are having different systems like lube oil system, fuel oil system etc. Oil coolers play important roles for controlling temperatures of these different systems.

Oil coolers required to be installed on ships require special consideration regarding material of construction since sea water will be circulated through the cooler as a cooling medium. Due to the highly corrosive nature of sea water, non ferrous materials like gun metal, naval brass and CuproNickel are required to be used in its construction. These coolers are designed for on board as well as off shore applications. These coolers are manufactured under the most stringent quality control norms and under third party inspection agencies like DGQA, ABS etc.

Marine Cooler
Marine Cooler

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HFO Heaters

Heavy fuel oil (HFO) is a black, low-grade fuel of tar-like consistency. HFO is used mainly to produce electricity, to fire boilers and blast furnaces in the pulp and paper industry, and to power large marine ships and vessels.

Due to its highly viscous nature HFO needs to be pre heated to a certain temperature before it can be used for the above applications.

Positron designs and manufactures steam to HFO heaters to suit customer requirements. The HFO heaters can be inline type or tank mounted type. Generally U bundle type heat exchangers are used for this application.

These can be designed according to good engineering practice or as per TEMA and ASME codes based on customer requirements.

HFO Heaters
Marine Cooler

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Transformer Oil Coolers

Transformer Oil coolers are heat exchangers used to cool the dielectric oil in power, distribution and furnace transformers. These coolers are designed based on customer requirements. A typical transformer oil cooler is made of copper tubes and brass tube sheets.

TOP OIL RISE (TOR) OR AVERAGE OIL RISE (AOR): Unlike heat exchangers in other applications, the oil temperature is expressed as a rise in relation to the cooling water or air temperature. If the Top Oil Rise (TOR) is given, the temperature represents the number of degrees that the hot oil is great than the cooling water or air temperature.

If the Average Oil Rise (AOR) is given, the temperature represents the number of degrees that the average oil temperature is greater than the cooling water or air temperature. The average oil temperature is simply the cooler inlet oil temperature minus the cooler outlet oil temperature divided by two.

HEAT LOAD:
The other parameter that is required to size a transformer oil cooler in all applications is the heat load or total losses in the transformer. The heat load is a function of the load and no-load losses in the transformer and is typically expressed in kW. The heat generated by the transformer losses is picked up by the oil and the heat is removed from the oil by the heat exchanger.

Transformer Oil Cooler
Transformer Oil Cooler

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Feed Water Heaters

A feed water heater is a heat exchanger designed to preheat boiler feed water by means of condensing steam extracted (or

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