ISA RP42.00.01

This Recommended Practice defines nomenclature for tube fittings most commonly used in instrumentation. It is not intended as a substitute for manufacturers’ catalog numbers, nor does it apply to special fittings. This Recommended Practice is intended to apply to mechanical flared and flareless tube fittings as commonly used in instrument tubing systems.

Purpose

The purpose of this Recommended Practice is to aid in the proper specification and application of instrument tube fittings by standardizing nomenclature. Proper use of this Recommended Practice should result in data that

a) more accurately describes a particular fitting for all interested parties;

b) permits better communications between manufacturer, vendor, purchaser, and ultimate user;

c) provides standardized nomenclature to be used by drafting, billing, purchasing, and stores groups; and

d) makes more clear the use of standardized symbols.