Every pressure relief valve on the unit is the last line of protection for the equipment behind it. Cerasus validates each one — scenario by scenario — so the relief register is complete, defensible and matched to what is actually installed.
PSV validation checks that every relief device has the right set pressure, is sized for the governing overpressure scenario, and that its inlet and outlet piping meet the pressure-drop and back-pressure limits that keep the valve stable. It also confirms the installed valve (orifice, type, bellows) matches the calculation.
The work produces a relief register — a living document that a plant needs for MOC, inspection planning and regulatory audits.
Fire, blocked outlet, control-valve failure, tube rupture, thermal expansion, utility failure, abnormal heat input and runaway reaction, per API 521.
Rigorous loads using simulation where two-phase or reactive relief applies (DIERS methods).
Orifice sizing per API 520 Part I; comparison with installed API 526 valve.
3 % inlet-loss rule and built-up / superimposed back-pressure limits per API 520 Part II.
Header hydraulics, radiation and MACH checks for the relieving cases.
Register, PSV datasheets and calculation sheets ready for audit and inspection.
Compile every relief device with P&ID tag, set pressure and installed data.
Identify credible scenarios; calculate loads case by case.
Size orifices; check inlet/outlet piping and installed valve.
Issue register, flag deficiencies with priority and recommended fixes.
API 520 Part I & IISizing, selection and installation of pressure-relieving devicesOSHA 29 CFR 1910.119(d)(3) & (j)PSM — relief system design basis (PSI) and mechanical integrityAPI 521Pressure-relieving and depressuring systemsAPI 526Flanged steel pressure-relief valvesAPI 527Seat tightness of PRVsAPI 576Inspection of pressure-relieving devicesAPI 2000Venting of atmospheric and low-pressure storage tanksASME BPVC Section VIII Div. 1UG-125 to UG-140 overpressure protectionISO 4126Safety devices for protection against excessive pressureCCPS / DIERSTwo-phase and reactive relief methodsSend a short brief — plant, service of interest and what you need to achieve — and a Cerasus engineer will respond with a proposed scope and next steps.
Prefer email or phone? sales@cerasus.ai · +974 5506 2743