1.1 This specification covers all cast strainers and welded strainers in services up to 150 psig and 150°F (1 MPa and 65°C). For welded strainers used in services above This specification provides the minimum requirements for the design, fabrication, rating, marking, and testing of all cast pipe line strainers, and welded pipe line strainers used in services up to 150 psig and 150°F