With over 40 years of experience in the design and manufacture of heat transfer equipment Graham Hart (Process Technology) Limited is well known for the production of TEMA shell and tube heat exchangers.
Units are exported world-wide and range from 100mm shell diameter up to 50 tonnes, with mechanical design to PD5500, ASME VIII Div I & Div II, BS EN 13445 and Stoomwezen.
Often described as the "workhorse” of the industrial process industry, the shell and tube heat exchanger is an immensely versatile unit, able to handle a wide range of process applications and conditions. Whether you are looking to cool, heat, vaporise or condense, the shell and tube can meet your needs.
TEMA is a Standard published by the Tubular Exchanger Manufacturers Association, Inc. (TEMA) for the mechanical design of Shell and Tube heat exchangers.
The TEMA Standard for shell and tube heat exchangers meet the requirements of most users. Your requirements may exceed the TEMA Standard, but will very rarely be less than. For industrial applications, we would recommend that the TEMA standard be your minimum level of acceptance.
The TEMA Standard is based around the ASME Design Code but is not itself a Design Code. While it is based around ASME, it may be also be used in conjunction with other design codes such as PD5500 or EN13445. Other Standards also exist such as API 660 / ISO 16812 - Petroleum, petrochemical and natural gas industries - Shell-and-tube heat exchangers.
Many users only experience TEMA for the purpose of Nomenclature and describing their requirements. However, TEMA goes much deeper covering areas such as Fabrication Tolerances, Performance Information, Installation, Operation, and Maintenance, Mechanical Standards, Flow Induced Vibration etc.
While almost every shell and tube heat exchanger is different in its design, they do generally have similar geometry characteristics, that allow them to be described through the TEMA three letter system. The table below shows how this lettering system works.
Selection of the configuration can depend on a wide range of factors such as whether the bundle needs to be removed for cleaning, whether the liquids are hazardous or what the pressures and temperatures the unit will see, to name but a few.
Our experienced Thermal Design Engineers will be able to propose an arrangement to meet the your individual requirements.
Using the above nomenclature, here are some examples...
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:
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.