How to Specify a Trunnion Mounted Ball Valve for Sour Gas Service | NACE MR0175 Material Requirements
In sour service valve material selection, the standard divides materials into three groups: Group Scope of application Typical materials Group 1 Covers about 80% of normal service conditions Carbon steel, low‑alloy steel Group 2 For non‑welded castings Martensitic stainless steel, etc. Group 3 For nickel‑base alloys Inconel series, etc. The standard strictly prohibits the use […]
How to Install a Large Bore Flanged Ball Valve | Alignment, Gasket Selection, Bolt Torque Sequence
The installation quality of large-diameter flanged ball valves (above DN300, Class 150~Class 600) directly determines the sealing reliability of the pipeline system. Unlike small-diameter valves, large-diameter flange joints require higher bolt preload forces and larger gasket areas. Any procedural deviation will be amplified during high-temperature and high-pressure (Max 550°C / Class 2500) operations. This article […]
