The majority of thermowells are rated according to American system design standards. Good engineering practice is outlined by the ASME (American Society of Mechanical Engineers) VIII Pressure Vessel Code. This standard refers to other American standards from bodies such as ANSI (American National Standards Institute) or ASTM (American Society for Testing and Materials). If a flange is specified as an ANSI X" 150 or greater, ANSI B16.5 is the standard it has to comply with. ANSI B16.5 in turn refers to other standards regarding materials and their form of manufacture, for example 'ASTM A182 Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges' and 'ASTM A105 Standard Specification for Carbon Steel forgings for Piping Applications'. Any flanged device provided under the ASME codes will have the flange size and rating as well as the material specification stamped on it. The flange can be marked for example with 'ANSI 1" 150lb ASTM A 182', indicating that it complies to ANSI B 16.5 and is made from a forging in accordance with ASTM A 182. Additional markings from reputable manufacturers may also indicate the cast number of the material, tag number and the order against which it is supplied. When specifying thermowells to European standards, P.D. (proposed document) 5500 (2006) is a harmonising document for the European Union. Although this has not yet been adopted as a European Directive, it is used as a unifying standard. Its standards and markings differ from the American standards but the principles remain the same.
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