How do you design a High Integrity Protection System (HIPS)?

HIPS design for high-pressure protection: define protection envelope (what equipment is protected, from what hazard), determine required SIL (typically SIL 2 or 3 for pipeline/vessel protection), select sensors (pressure transmitters with appropriate range, SIL-rated, redundant configuration), design logic (fast response, voting scheme, hydraulic lockup vs bleed-down), specify shutdown valves (fast-acting, fire-safe, SIL-rated), implement velocity limiting (prevent surge from rapid closure), address common cause (separate from BPCS, diverse pressure sources), and provide independent overpressure protection for valve closure case. HIPS-specific considerations: response time analysis (pressure wave travel, valve stroke), process interface (location, tapping orientation), and testability during operation. Coordinate with relief device sizing.