MSS SP-43 is a recognized standard practice that sets forth guidelines for the dimensions, tolerances, and markings of buttwelding fittings primarily designed for low-pressure and corrosion-resistant applications. Here are the key points of this standard:
MSS SP-43 Standard Practice for Buttwelding Fittings
1.1 Purpose:
- The primary purpose of MSS SP-43 is to establish standardized specifications for buttwelding fittings.
- These fittings are specifically intended for use with Schedule 5S or 10S pipes, as defined in ASME B36.19M.
- Additionally, this standard includes provisions for short pattern stub ends that are compatible with Schedule 40S pipes.
1.2 Scope:
- MSS SP-43 applies to buttwelding fittings designed to be used with pipes of various nominal pipe sizes (NPS) as specified in ASME B36.19M.
- The standard focuses on fittings for low-pressure applications and those requiring resistance to corrosion.
- Short pattern stub ends suitable for use with Schedule 40S pipes are also addressed within the scope of this standard.
In summary, MSS SP-43 provides a framework for the manufacturing and usage of buttwelding fittings specifically tailored for low-pressure and corrosion-resistant scenarios, aligning with specific pipe schedules as defined by ASME standards.