tank pressure vacuum relief

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

1) For Tanks larger than 840,000 gal (20,000 Bbls), refer to API-2000 for breathing requirements.

Tank Pressure & Vacuum ProtectionDesign Sheet

T - 100Slop 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 1Electronic FileName: Tank Pressure Vacuum Relief.xls

WorkSheet: Design Basis