Heat Recovery
Te company has invested research and development resources into maximising gasket life and optimising design. “If there is one thing we pride ourselves on more than any other,” Cutler says, “it is the initial fit of our gaskets. Probably better than any other manufacturer we are able to guarantee meeting the original equipment manufacturers’ tight tolerances in gasket length control.” An emerging trend is that the PHE original equipment manufacturers, who have predominantly manufactured in Europe up until now, are expanding production globally. “Tat’s where our global reach becomes important,” explains Cutler. “In Europe we manufacture in Poland, and demand from the Americas is fulfilled from Trelleborg’s facility in Tijuana, Mexico. With manufacturing in Asia increasing, we have now transferred gasket technology to our plant in Shanghai, China.”
Sealing in an aggressive environment
“Wander around a processing plant and you’ll see PHEs up to five metres in height,” says Jonas Jerleus, Trelleborg Sealing Solutions Global PHE Co- ordinator.
“Te largest plate width is 1.5metres. Tey will
range from this size down to about 280millimetres long and 100millimetres wide. Gasket thickness is from 20millimetres down to just two.
“Sealing conditions are very demanding in PHEs. Temperatures are at extremes, from -45°C to 200°C, while chemicals are extremely aggressive. “As the liquids are pushed through a large PHE with maybe 200 plates, pressures are also high.”
Heat and cooling
Te design concept of all PHEs is the same. Between two metal end plates there is a series of thin metal plates close to each other. Te liquid to be processed is pumped into one side of the plates while the liquid facilitating heating and cooling is pumped into the other. Te key to the process is that both liquids come into contact with the maximum plate surface area to rapidly exchange heat from one liquid to the other. In processing plants PHEs can be up to five
metres/16feet in height. Te largest length is four metres/13feet and plate width is one and a half metres/ five feet which is the maximum size that strip steel can be produced. Plates will range from this size down to about 280
millimetres/11inches long and 100millimetres/4inches wide.
Te plate heat exchanger gaskets have to match
the size of the plates with thicknesses which range from two millimetres/0.08inches up to 20millimetres/0.8inches. ●
For more information, visit
www.trelleborg.com
Circle 27 or ✔ at
www.engineerlive.com/ies
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