tank pressure vacuum relief

Gary Arnold Newalta Mackay River Centrifuge Feed Tank Tank Pressure Relief Tank Flash Point o F 350 (Estim.) oz/in2 16.0 Boiling Point o F 360 (Estim.) oz/in 2 0.5 Latent Heat Vap. Btu/lb 144 (Hexane) ft 21.0 Molecular Wt. 274 ft 24.3 gal 62,958 ft 2 1,603.2 3,430 6,002 Fire BTU/hr-ft 2 7,280 SCFH 433,368 Assume Bare Metal 2,246 SCFH N/A Thermal Breathing, Note 1 SCFH N/A Out SCFH 899 SCFH N/A In SCFH 1,499 2.9 oz/in 2 Required SCFH 6,901 Fail Open SCFH 0 1.2 oz/in 2 Required SCFH 3,745 Inflow SCFH 10,646 Fire SCFH 437,112 Outflow SCFH 3,745 8.0 oz/in 2 Required SCFH 10,646 0.5 oz/in 2 Required SCFH 3,745 Set at 14 oz/in 2 Required SCFH 426,466 zero (if have Vent Valve and Emergency vent) or worst case sum of outflows + in Breathing + fail open vent valve From Hose zero (if Con vent has capacity) or Worst case - Con Vent Consider this only if the tank vents to a vacuum source or header Relief Inflow + Out Breathing + Blanket Gas Valve + Relief Blowoff Fire + Blanket Gas valve sum of outflows + in Breathing + fail-open vent valve + Steam Failure Inflows, SCFH Relief Scenario Therm. Conductivity Relief, Hose +unload Blow Through From Upstream 2) Fire hatch is not required if: cone roof tank has a weak roof seam, or Conservation Vent has capacity. Notes: Required Capacity Stored Material Design Pressure Max Vacuum Diameter Max fill Height Max fill Volume Wetted Area Outflow Case 1) For Tanks larger than 840,000 gal (20,000 Bbls), refer to API-2000 for breathing requirements. Tank Pressure & Vacuum Protection Design Sheet T - 100 Slop Oil Normal max inflow + out breathing + Blowoff (normal unloading) Normal Operation Vent Line/Valve (Outlet) Outflows, SCFH Blanket Gas Valve (Inlet) Vacuum Side set at Conservation Vent (PVRV or Thief Hatch) Emergency Relief (EPRV), Note 2 Pressure Relief Cases Pressure side set at Page 1 of 1 Electronic FileName: Tank Pressure Vacuum Relief.xls WorkSheet: Design Basis

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Tank Pressure Vacuum Relief

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Gary Arnold NewaltaMackay River Centrifuge Feed Tank

Tank Pressure Relief

TankFlash Point oF 350 (Estim.) oz/in2 16.0Boiling Point oF 360 (Estim.) oz/in2 0.5Latent Heat Vap. Btu/lb 144 (Hexane) ft 21.0Molecular Wt. 274 ft 24.3

gal 62,958ft2 1,603.2

3,4306,002 Fire BTU/hr-ft2 7,280

SCFH 433,368 Assume Bare Metal

2,246SCFH N/A

Thermal Breathing, Note 1 SCFH N/AOut SCFH 899 SCFH N/AIn SCFH 1,499

2.9 oz/in2

Required SCFH 6,901Fail Open SCFH 0

1.2 oz/in2

Required SCFH 3,745

Inflow SCFH 10,646Fire SCFH 437,112Outflow SCFH 3,745

8.0 oz/in2

Required SCFH 10,6460.5 oz/in2

Required SCFH 3,745

Set at 14 oz/in2

Required SCFH 426,466

zero (if have Vent Valve and Emergency vent) or worst case

sum of outflows + in Breathing + fail open vent valve

From Hose

zero (if Con vent has capacity) or Worst case - Con Vent

Consider this only if the tank vents to a vacuum source or header

Relief Inflow + Out Breathing + Blanket Gas Valve + Relief Blowoff Fire + Blanket Gas valvesum of outflows + in Breathing + fail-open vent valve + Steam Failure

Inflows, SCFH

Relief Scenario Therm. Conductivity

Relief, Hose +unload

Blow Through From Upstream

2) Fire hatch is not required if: cone roof tank has a weak roof seam, or Conservation Vent has capacity.

Notes:

Required Capacity

Stored MaterialDesign Pressure

Max VacuumDiameter

Max fill HeightMax fill Volume

Wetted Area

Outflow Case