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PO BOX 1928
<br />BENICIA, CA 94510
<br />TEL 707 346 5058
<br />FAX 707 922 2284 711 MATERIALS INC. STI SP001 EXTERNAL INSPECTION
<br />WATERFORD, CA
<br /> www.powerseicom 12,000 GALLONS DIESEL TANK
<br />
<br />STI-SP001 External George Reed Inc. Escalon, CA Tank 7,000 Gal October 2024 Project #24-378
<br />Rev0
<br />© 2024 PEI Inc.
<br />Page 15 of 43 Date Printed: 11/7/24 7:42 AM
<br />
<br />5. Venting Analysis
<br />
<br />
<br />ft
<br />ft
<br />ft
<br />gal
<br />sq. ft
<br />in
<br />mmHg
<br />in
<br />in *Pipe sizes apply only to open vent ≤ 12-in long
<br />in
<br />in
<br />SCFH
<br />0 gpm 0 gpm
<br />0 7
<br />38 °1
<br />0 SCFH Air 0 SCFH Air
<br />122 SCFH Air 1,481 SCFH Air
<br />122 SCFH Air 1,481 SCFH Air
<br />Normal Vent:
<br />Open Vent
<br />1 Pressure Capacity Vacuum Capacity
<br />4 in 16,500 SCFH 16,500 SCFH
<br />0 in 0 SCFH 0 SCFH
<br />0 in 0 SCFH 0 SCFH
<br />0 in 0 SCFH 0 SCFH
<br />0 in 0 SCFH 0 SCFH
<br />16,500 SCFH 16,500 SCFH
<br />Emergency Vent:
<br />1 Pressure Capacity Vacuum Capacity
<br />0 in 0 SCFH 0 SCFH
<br />0 in 0 SCFH 0 SCFH
<br />0 in 0 SCFH 0 SCFH
<br />0 SCFH 0 SCFH
<br />16,500 SCFH 16,500 SCFH
<br />Shop Fabricated AST
<br />Thermal In Breathing, Vit
<br />Venting Recommendations based on Wetted Area as per NFPA 30 & UL 142
<br />9.86
<br />15.3
<br />NA
<br />3500
<br />NA
<br />343,052
<br />Venting area >= 90% In/Out, Existing venting area is Ok as per NFPA 30 21.4.3.3.
<br />Normal vent shall be sized using either API 2000/another approved standard or shall be at least as
<br />large as the largest inlet/outlet nozzle, but no less than 1.25-in diameter.
<br />Normal Venting Capacity Check (API 2000) :
<br />Normal Venting Capacity
<br />Emergency Venting Capacity
<br />Number of Emergency Vents
<br />Size of Emergency MW w/ Long Bolt
<br />NA
<br />Class 3B
<br />Lube Oil
<br />474
<br />4
<br />Normal In Breathing (Vacuum)
<br />Product Flow Rate Out, Vpf
<br />C Factor for VP, T, and Latitude
<br />Insulation Factor, Ri
<br />Total Normal In Breathing Required
<br />In Breathing due to Discharge, Vip
<br />Tank SS-1 is equippped with 1 normal vent (4-in) and 1 emergency vent ( ). The size of the largest nozzle is 4-in.
<br />The tank requires 122 SCFH of out-breathing and 1,481 SCFH of in-breathing at normal condition. The required emergency venting capacity is 343,052 SCFH.
<br />Venting area >= 90% In/Out, Existing venting area is Ok as per NFPA 30. As per API 2000 calculation, the existing Normal Venting capacity is sufficient.
<br />The existing total venting on the tank is 16,500 SCFH. Emergency venting capacity is insufficient.
<br />Venting system recommendation for this tank is 4-in normal vent, 8-in emergency vent.
<br />Venting capacity for pressure is sufficient. Venting capacity for vacuum is sufficient.
<br />Min. Nominal Pipe Size, Normal Vent:
<br />Min. Nominal Pipe Size, Normal Vent, for tank with manhole
<br />as emergency vent:
<br />Min. Nominal Pipe Size, Emergency Vent :
<br />Emergency Vent Size, without Screen:
<br />Emergency Vent Size, with Screen:
<br />4-in or larger, unless API 2000 or
<br />pumping rate capacity is less than
<br />capacity of piping
<br />2
<br />8
<br />NA
<br />Vent Type
<br />Thermal Out Breathing, Vot
<br />----
<br />Emergency Venting Capacity Check (UL 142 & NFPA 30):
<br />*If Unknown, PVV capacity is based on Varec PVV at 0.85" wc. Open vent
<br />capacity is based on S&J Free Vent at 0.85" wc. Verify with manufacturer
<br />for specific vent capacity.
<br />Emergency venting capacity is insufficient.
<br />Total Normal Out Breathing Required
<br />Normal Out Breathing (Pressure)
<br />Product Flow Rate In, Vpf
<br />Vent Options (API 2000):
<br />4-in normal vent, 8-in emergency vent
<br />4-in normal vent
<br />Vent Options (UL 142 & NFPA 30):
<br />Emergency Venting Capacity Required:
<br />*VP is unknown or larger than Hexane
<br />(130mmHg at 20C)
<br />Conclusion:
<br />VENTING CONFIGURATION
<br />API 2000 Venting Calculation for Atmospheric and Low Pressure Tanks
<br />Existing Venting Adequacy
<br />Normal Venting Size Check (NFPA 30) :
<br />Size of Emergency Vent 2
<br />Size of Emergency Vent 1
<br />Total Existing Normal Venting Capacity:
<br />Total Venting Capacity on Tank (Normal + Emergency):
<br />Total Existing Emergency Venting Capacity:
<br />Number of Normal Vents
<br />Size of Goose Neck Vent 1 (in)
<br />Size of Vapor Recovery Unit (in)
<br />Size of Vent 4 (in)
<br />Size of Vent 3 (in)
<br />VENTING SELECTION (SP001, NFPA30, UL142, API2000)
<br />Size of Largest Product In/Out Nozzle :
<br />Size of Vent 2 (in)
<br />Tank Shape
<br />Capacity
<br />Wetted Area
<br />Product
<br />Product Class
<br />Vapor Pressure at 20 °C, VP
<br />Tank Type
<br />Fill Height, H
<br />Diameter or Width, D/W
<br />Length, L
<br />Vertical Cylindrical
<br />Tank ID
<br />Factor for Latitude, Y
<br />Latitude
<br />Out Breathing due to Filling, Vop
<br />SS-1
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