Pressure Safety Relief Valve WCB 3 x 4 Class 150 — Slop Oil Service

Technical Datasheet | Supreme Valves India

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1. General

ParameterSpecification
ManufacturerSupreme Valves India
Valve TypeConventional spring-loaded pressure safety relief valve, full nozzle, full lift, closed bonnet
Service FluidSlop oil (crude oil), liquid phase
Operating Pressure8.0 to 15.0 bar(g)
Operating Temperature50 to 80 deg C
Set Pressure16.5 bar(g)
Relieving Pressure18.15 bar(g) at 10% overpressure
Design / Sizing / TestAPI 526 / API 520 Part I / API 527

2. Connections and Sizing

ParameterSpecification
Inlet3 inch (DN80), ASME Class 150, raised face
Outlet4 inch (DN100), ASME Class 150, raised face
End ConnectionFlanged to ASME B16.5
Orifice DesignationK
Orifice Diameter38.8 mm
Selected Orifice Area1.838 sq in
Rated Discharge Capacity149,530 kg/hr at relieving conditions
Approx. Width A156 mm
Approx. Height B162 mm
Approx. Face-to-Face C674 mm (confirmed on GA drawing with order)
AccessoriesPacked lifting lever, screwed cap

3. Materials of Construction

ComponentMaterial
BodyASTM A216 Gr. WCB
Bonnet / CapASTM A216 Gr. WCB
Nozzle / Nozzle RingASTM A351 Gr. CF8
DiscType 304 stainless steel
Disc Holder / GuideASTM A351 Gr. CF8
Stem / Adjusting ScrewType 410 stainless steel
Setting SpringCarbon steel
Studs / NutsASTM A193 Gr. B7 / ASTM A194 Gr. 2H
GasketAramid fibre, non-asbestos
Lifting LeverCarbon steel, packed type

4. Testing and Documentation

ItemRequirement
Set and Seat TestEach valve set and tested at works per API 527
Hydrostatic Body TestPer rated Class 150 inlet and outlet
Material Test CertificateEN 10204 3.1 for pressure-retaining parts
Test CertificateSet pressure test certificate and seat tightness report
NameplatePer API 526 — size, orifice, set pressure, capacity, material, serial number