MSS SP-45 Technical Standard: Standardization of Drain and Bypass Connections
The MSS SP-45 standard defines engineering requirements for the design of connection assemblies for valves and fittings intended for drain systems and bypass lines. This standard is applicable to pipelines of all pressure classes and ensures the unification of connection points in industrial networks.
EV Group China experts highlight the following key parameters of the regulation:
- A unified system of symbolic marking and regulated spatial positioning of drain and bypass openings.
- Standardization of nominal opening diameters to ensure correct media flow rates.
- Requirements for the minimum thread length in drain and bypass line branches.
- Geometric tolerances: minimum diameter and bore depth for socket-weld (SW) connections.
- Technological standards for butt-weld (BW) connections during bypass installation.
- Structural parameters of welded bosses used as sampling points.
- Methodology for marking reducing fittings to prevent errors during design and installation.