Industrial semi-welded line

Alfa Laval Industrial semi-welded line is used when gaskets are not suitable for one of the process media. Also, the semi-welded line can take a higher design pressure compared to fully gasketed plate-and-frame heat exchangers.

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Unique sealing system

Alfa Laval Industrial semi-welded line handles most refrigerants and is particularly suitable for applications involving ammonia. Semi-welded heat exchangers are used in both organic and inorganic chemical processing when the chemicals involved limit the selection of gaskets that can be used or when the required design pressure makes fully gasketed plate-and-frame heat exchangers insufficient.

The media passes through the welded channel facing the ring gasket sealing between the laser welded cassettes. Alfa Laval semi-welded heat exchangers employ the Alfa Laval RefTight™, a unique sealing system  which guarantees high performance by positioning the laser weld on the outside of the ring gasket groove. The smooth ring gasket grove ensures equal sealing force over the entire porthole gasket.

Equipped with well-designed features, Alfa Laval Industrial semi-welded line of heat exchangers are easy to maintain and have a long service life. Some of the features available include:

  • ClipGrip™ gasket – a glue free gasket with superior alignment that ensures a perfect seal and trouble-free maintenance. 
  • Alfa Laval RefTight™ – a unique gasket groove design with maximum gasket support and minimum gasket contact.
  • CurveFlow™  distribution area  ensures full use of the heat transfer area and minimizes fouling.

Peace of mind

Alfa Laval global service network is never far away. 

Benefits

  • High energy efficiency
  • Flexible configuration
  • Easy to install
  • High serviceability 
  • Access to Alfa Laval’s global service network

How it works

The heat transfer area of a gasketed plate-and-frame heat exchanger consists of a series of corrugated plates, assembled between the frame and pressure plates, which retain the design pressure. For the highest thermal performance and to enable a very close temperature approach, fluids normally run counter-currently through the heat exchanger.

The sealing between the plates on the Industrial semi-welded line alternates between laser welds and gaskets. The laser welded channel allows use of fluids that are not compatible with normal gaskets and also allows for higher design pressure than fully gasketed plate-and-frame heat exchangers. Additionally, the Alfa Laval RefTight™ sealing system guarantees equal sealing force over the entire porthole gasket.

Industrial semi-welded line is available with various pressing depths and angles of the chevron pattern and various shapes of the corrugation which are carefully designed and selected to achieve optimal performance. The CurveFlow™ and the chocolate pattern distribution area are two design features available that ensure fluids are evenly distributed across the entire plate.  The result is that the entire heat transfer surface is fully utilized and stagnant zones that can result in fouling are avoided.

High flow turbulence between plates results in higher heat transfer; however, the consequence is pressure drop. Our thermal design engineers will help you design and select the model and configuration that is suitable for your application needs while delivering maximum thermal performance and minimizing pressure drop.

Liquid/Liquid GPHE

Steam Heater GPHE

2-pass GPHE

 

Features that matter

It's important to understand that all gasketed plate heat exchangers are not the same. The features highlighted below are important components to look for in a GPHE, and when combined, these features offer extensive benefits, such as reduced total cost of ownership, higher efficiency and increased staff safety.

RefTight sealing system

What is it?

The sealing weld is positioned separately - outside the ring gasket, which ensures equal sealing force over the entire port hole gasket, guaranteeing higher performance through the welded channel.

Risks with other designs

The sealing weld is commonly placed inside the ring gasket groove. This combined with an uneven port hole groove can lead to gasket material stress and can eventually lead to gasket failure.

Distribution system - CurveFlow

What is it?

One of the most important features of a plate heat exchanger, the distribution area ensures full use of the heat transfer area and minimizes fouling.

Risks with other designs

An inefficient distribution area with uneven flow causes maldistrubution and fouling build up.

ClipGrip gasket

What is it?

A glue free gasket with superior alignment that ensures a perfect seal and trouble-free maintenance. Fastening to the plate is improved by having five fastening points.

Risks with other designs

Other gasket designs, such as snap-in gaskets, only have one fastening point to the plate. If this one point is lost, there is no gasket fastening function.

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