5.15 Nonstandard Components
Components not manufactured to a recognized national standard are preferably to be Type Approved (see 1-1-A3/5 of the ABS Rules for Conditions of Classification (Part 1)). They may be considered for acceptance based on manufacturers’ specified pressure and temperature ratings and on presenting evidence, such as design calculations or type test data, that they are suitable for the intended purpose. For Classes I and II piping applications, drawings showing details of construction, materials, welding procedures, etc., as applicable, are to be submitted for such components, along with the basis for the pressure and temperature ratings.