How to Interpret a Valve Pressure Test Report | API 598 Shell and Seat Test Acceptance Criteria
During valve procurement, factory acceptance testing, turnaround inspection, or pre-shipment review, the valve pressure test report is one of the most important quality documents. A report that looks complete at first glance may still contain wrong test pressure, insufficient hold time, unclear test direction, unsuitable test medium, or an incorrect leakage acceptance criterion. This is […]
How to Design a Double Block and Bleed Valve Assembly for Safe Isolation and Bleed Verification
Three DBB valve banks at one petrochemical plant failed to vent completely because the bleed connection was routed to a higher discharge header without proper drain consideration. The problem was not only the valve selection. The bleed line geometry created liquid holdup and made pressure verification unreliable. A DBB valve assembly must be designed as […]
How to Choose Between Cast and Forged Ball Valves for Offshore Platforms | Weight, Strength, Cost
Selecting between cast and forged ball valves for offshore platforms involves trade-offs across weight, strength, cost, delivery time, maintainability, inspection risk, and long-term service reliability. Based on offshore replacement, procurement, and inspection experience, forged products are generally preferred for small-bore, high-pressure, high-cycle, and vibration-sensitive services. Cast products remain practical for many large-bore and medium-pressure services […]
