Pressure Vessels

Each pressure vessel that we manufacture is per the American Society of Mechanical Engineers (ASME) code. As a leading ASME pressure vessels manufacturer, our specialty lies in working with a variety of alloys, pressures, & designs to meet your custom requirements. More »

Weld Overlay and Clad Vessels

Our weld overlay and clad vessels are fully code-compliant. We use our advanced welding techniques to their full capabilities to offer you the finest overlay/clad components and pressure vessels. More »

High Pressure Vessels

We hold the American Society of Mechanical Engineers (ASME) U, U2, and U3 stamps, and have the capabilities and resources to manufacture ASME high pressure vessel to your exacting specifications. More »

Autoclaves

We hold the American Society of Mechanical Engineers (ASME) U, U2, U3, PP, & S stamps, and have the capabilities and resources to manufacture autoclaves to your exacting specifications. More »

Heat Exchangers

We specialize in the design, engineering, and fabrication of Shell and Tube Heat Exchangers, including thermal calculations. All of our units are built in strict accordance with the latest edition and addenda of the A.S.M.E. Code, Section VIII Division 1, 2, or 3 and T.E.M.A.” More »

 

Understanding Main Cryogenic Heat Exchangers

In Liquefied Natural Gas (LNG) plants, the main equipment that supports the LNG heat exchange process is the Main Cryogenic Heat Exchanger (MCHE). These are the most widely used process equipment in industrial sites and factories. It is mainly used in industries where there is a requirement for temperature regulation. What are MCHEs and how do they work? And what is their importance? We will answer these questions in this post.

What are Cryogenic Heat Exchangers?

Quite simply, heat exchangers are designed to transfer heat from one medium to another. Cryogenic heat exchangers are used to cool down elements to prevent volatile substances or equipment from overheating. MCHEs are at the heart of any gas liquefaction plant. A traditional exchanger is a large sized equipment, 16.5 feet in diameter, 180 feet in height, and weighs 500 tons. This large size results in simple piping and control systems. They reduce costs in terms of operations and maintenance.

How do MCHEs Work?

The primary function of the cryogenic heat exchanger is to exchange heat between two fluids. This is accomplished via a set of tubes, which are within a casing. The tubes are supported by other components, such as fans, condensers, coolants, etc. These various components help improve flow and cooling efficiency.
Cryogenic heat exchangers are also known as indirect contact heat exchangers. They are named such that they keep the hot and cold fluids separated at all times. The fluids will pass through a set of pipes, one dedicated for each fluid. This is done to ensure that the fluids do not contaminate each other.

Fluid Flow Design

As the fluids are separated, their flows need to be separated as well. There are two ways in which the flow can be controlled:

  • Cross Flow: The hot and cold fluids enter the cryogenic heat exchanger at different points. As the fluids travel through the heat exchanger, they often cross paths with each other at right angles.
  • Parallel Flow: In this flow pattern, the fluids enter the heat exchanger from the same end. As they pass through the system, they flow parallel to each other.

This is just a basic description behind the design and operation of the main cryogenic heat exchanger. Contact your heat exchanger manufacturer for detailed information.

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