SIL
5 in-depth engineering guides on SIL — specification, selection, testing and procurement.
Everything on SIL
Vajra's engineering team has published 5 technical guides covering SIL for industrial valve selection, specification, testing and procurement. Browse the full set below.
Partial Stroke Testing (PST) for ESD and Shutdown Valves: SIL Proof-Test Guide
Emergency shutdown valves sit idle for years, and a valve that will not move on demand is a dangerous failure. Partial stroke testing moves the valve a small amount without disrupting the process to prove it can move, raising diagnostic coverage and extending proof-test intervals. This guide covers PST in the context of IEC 61508 and IEC 61511 functional safety.
Valve Actuator Fail-Safe Action: Fail-Closed, Fail-Open, and Fail-Last
Fail-safe action defines what an actuated valve does on loss of power or signal: move to closed, move to open, or stay in place. Choosing the correct fail direction is a fundamental process-safety decision. This guide explains fail-closed, fail-open, and fail-last actuation and how to select the right one.
HIPPS Valves: High Integrity Pressure Protection System Design and Selection
A High Integrity Pressure Protection System replaces or supplements relief valves by closing off the source of overpressure before a rupture can occur. This guide covers the final-element valve requirements that make a HIPPS certifiable.
Emergency Shutdown (ESD / SDV) Valve Guide: SIL, Partial Stroke & Fail-Safe
Emergency shutdown valves are the final element of a safety instrumented function - they must close on demand, every time, even on fire or power loss. This guide covers fail-safe design, SIL, partial-stroke testing, and selection for ESD service.
Industrial Valve Actuators: Pneumatic, Electric and Hydraulic Selection Guide
Selecting the right actuator type for an automated valve is as critical as selecting the valve itself. Pneumatic, electric, and hydraulic actuators each have distinct characteristics, advantages, and limitations that make them suitable for different process environments and control requirements.
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