Graham Hart (Process Technology) Ltd. have extensive experience in the design and manufacture of high pressure and high temperature shell and tube heat exchangers (HPHTHE). Our blend of process/mechanical design experience, together with our in-house machining and tube-to-tubesheet joint technology, puts us in a very unique position.

As the pressures increase, so must the level of Quality and attention to detail. Safety and the ability to test the equipment, prior to service, is paramount. You are stepping out of the realms of standard fabrication and into the field of precision and high tolerance.

Accurate, consistent, repeatable drilling of holes upto 20D ratio, together with our proven gasket sealing methodology and measured, right first time, bolt tensioning technology, allows us to work closely with Notified Bodies.

Our high pressure equipment has a dedicated international client following and finds itself successfully installed in a multitude of sectors ranging from the highly viscous polymers and plastics to the high pressure, high temperature gas processing industries.

The more information that a client can supply, the closer the design can meet the process requirements. The minimum information required, however, is as follows:

  • Fluid Flow Rates
  • Stream Temperatures
  • Stream Composition / Physical Properties Data
  • Stream Pressures
  • Available Pressure Drop

Whether it be NACE spec materials for the Oil Industry or weld overlayed / explosively bonded tubesheets, we manufacture heat exchangers in most combinations of materials.

  • Low-alloy steel
  • Ferritic chromium stainless steels
  • Austenitic chromium-nickel steels
  • Copper-base alloys
  • Nickel-base alloys
  • Titanium
  • Stainless Steel
  • High Nickel Stainless Steel
  • Duplex Stainless Steel
  • Hastelloy
  • Incoloy
  • Cupro Nickel
  • Copper
  • Brass
  • Carbon Steel
  • Low Temperature Steel


+44(0)1274 617021


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