It is not intended to set rigid specifications for materials@ fabrication@l pressure rating@ and similar points since these should ordinarily be in compliance with code requirements which are established for the particular industry concerned. It is recognized that a wide variety of special forms of chambers@ dimensions and operating principles have been recommend by instrument manufacturers@ and have been successfully used throughout the measurement field. The forms advocated by this report@ however@ are consistent with those available either from manufacturers or by field fabrication@ and are currently used in a great number of installations. Various more elaborate forms of seal and condensate chamber offer operational advantages@ but are difficult to field-fabricate therefore not considered to be within the scope of this report. PURPOSE Head-type fluid meter installations will be simplified considerably by the adoption of uniform practices in the fabrication of their seal and condensate chambers. This uniformity pertains to the over-all dimensions@ general arrangement and location of connections@ and minimum sealing volume required by conventional meters. Pursuant to the adoption of the recommendations contained in this report@ all similar types of seal and condensate chambers would be interchangeable with respect to installation dimensions@ regardless of their source of supply.
ISA RP3.1-1951 history
1951ISA RP3.1-1951 FLowmeter Installations Seal and Condensate Chambers