specials - f.w. webb companygravels gw well-graded gravels and gravel mixtures gp poorly graded...
TRANSCRIPT
SPECIALSMARCH 2015
fwwebb.com/gas
Pictures shown do not necessarily represent the exact model of the product number and description. Pricing is good through March 25, 2015.
Webb# MFR# Description Price
CHARTER PLASTICS YELLOW GAS PIPE
193141 YGP12CTS090-200 GAS PIPE 1/2CTS 200 FOOT ROLL $0.19 /Foot 183524 YGP12CTS090-500 GAS PIPE 1/2CTS 500 FOOT ROLL $0.19/Foot 165740 YGP12SDR93-200 GAS PIPE 1/2 IPS 200 FOOT ROLL $0.25/Foot 183399 YGP12SDR093-500 GAS PIPE 1/2 IPS 500 FOOT ROLL $0.25 /Foot 165742 YGP34SDR11-150 GAS PIPE 3/4 IPS 150 FOOT ROLL $0.35 /Foot 183429 YGP34SDR11-500 GAS PIPE 3/4 IPS 500 FOOT ROLL $0.35 /Foot 165744 YGP1SDR11-200 GAS PIPE 1" IPS 200 FOOT ROLL $0.50/Foot 183430 YGP1SDR11-500 GAS PIPE 1" IPS 500 FOOT ROLL $0.50 /Foot
Webb# MFR# Description Price
CONTINENTAL RISERS WITH COUPLINGS
411528 CST1253-91-4604-25 RISER 1/2"MPT X 1/2"CTS WITH COUPLING $44.46 411533 CST1353-91-4612-25 RISER 3/4"MPT X 1/2"IPS WITH COUPLING $46.93 411534 CST1353-91-4613-25 RISER 3/4"MPT X 3/4" IPS WITH COUPLING $58.21 411542 CST1453-91-4614-25 RISER 1"MPT X 1"IPS WITH COUPLING $65.32
CON-STAB COUPLINGS
269237 CST3259-52-1004-00 COUPLING 1/2" CTS $9.48 269238 CST3259-52-1012-00 COUPLING 1/2" IPS $23.64 269239 CST3259-52-1013-00 COUPLING 3/4" IPS $16.44 269289 CST3259-52-1014-00 COUPLING 1" IPS $24.38
CON-STAB TEE’S
269212 CST3259-50-1004-00 TEE 3-WAY 1/2" CTS $32.74 269213 CST3259-50-1012-00 TEE 3-WAY 1/2" IPS $45.28 269214 CST3259-50-1013-00 TEE 3-WAY 3/4" IPS $44.38 269215 CST3259-50-1014-00 TEE 3-WAY 1" IPS $48.97
CON-STAB 90" ELBOW
269218 CST3259-51-1004-00 ELBOW 90DEG 1/2" CTS $14.61 269219 CST3259-51-1012-00 ELBOW 90DEG 1/2" IPS $31.09 269220 CST3259-51-1013-00 ELBOW 90DEG 3/4" IPS $19.12 269221 CST3259-51-1014-00 ELBOW 90DEG 1" IPS $21.85
CON-STAB TRANSITION
411581 CST4646-00-1904-25 TRANS FITTING 1/2"MPT X 1/2"CTS W/COUPLING $28.56 427358 CST4646-00-1912-25 TRANS FITTING 3/4"MPT X 1/2"IPS W/COUPLING $50.07 411583 CST4646-00-1913-25 TRANS FITTING 3/4"MPT X 3/4"IPS W/COUPLING $28.11 411584 CST4646-00-1914-25 TRANS FITTING 1"MPT X 1"IPS W/COUPLING $38.57
CHAMFERING TOOL, REQUIRED FOR ALL CON-STAB CONNECTIONS
371814 CST0000-33-6580-04 CHAMFERING TOOL W/GAUGE 1/2"CTS $27.92 411913 CST0000-33-6580-12 CHAMFERING TOOL W/GAUGE 1/2"IPS $27.92 371810 CST0000-33-6580-13 CHAMFERING TOOL W/GAUGE 3/4" IPS $22.85 371811 CST0000-33-6580-14 CHAMFERING TOOL W/GAUGE 1" IPS $22.85
CLICK: fwwebb.com/gasCALL: 800.243.9360 VISIT: Over 80 stocking
locations throughout the northeast
Webb# MFR# Description Price
ACCESSORIES FOR PIPE TESTING AND INSTALLATION
183516 MISUD21 TAPE UNDERGROUND GAS 31-140 $37.09 359306 VCTTRACERWIRE TRACER WIRE 500FT SPOOL 14GAUGE $80.00 461234 VCTPETG202 PRESSURE TEST GAUGE 0-30PSI 2" DIAL $11.72 184312 TSTLTG4 LEAK DETECTOR ALL SEASON 1 GALLON $14.28 184309 TSTBTL16CYLUNPR SPRAY BOTTLE 16OZ $3.05 184310 TSTTLPINTUNLABE BRUSH TOP BOTTLE 16OZ $4.43 184311 TSTBTL8DBRUNPRI DAUB BOTTLE EMPTY W/CAP 8OZ $2.91
Webb# MFR# Description Price
MINUTEMAN ANCHORING KITS
476455 MIMDRYCONCRETEKIT DRY CONCRETE ANCHOR KIT $45.96 476456 MIMEARTHANCHORKIT EARTH ANCHOR KIT $73.27 476457 MIMWETCONCRETEKIT WET CONCRETE EARTH ANCHOR KIT $49.90
Webb# MFR# Description Price
TRAC-PIPE ROLLS
368348 TRPFGP-CS-375-250 PIPE COUNTER STRIKE 3/8X250' $1.98/Foot 368160 TRPFGP-CS-500-250 PIPE COUNTER STRIKE 1/2X250' $2.21/Foot 368159 TRPFGP-CS-750-250 PIPE COUNTER STRIKE 3/4X250' $2.88/Foot 368344 TRPFGP-CS-100-180 PIPE COUNTER STRIKE 1X180' $4.11/Foot
AUTOFLARE FITTING NEW STYLE
496467 TRPSFST-500 ADAPTER AUTOSNAP 1/2" MPT $9.66 496468 TRPSFST-750 ADAPTER AUTOSNAP 3/4" MPT $13.16 496466 TRPSFST-1000 ADAPTER AUTOSNAP 1" MPT $20.34
AUTOFLARE FITTING ORIGINAL STYLE
216968 TRPFST-375 FITTING AUTOFLARE 3/8 MPT $7.96 87393 TRPFST-500 FITTING AUTOFLARE 1/2 MPT $9.18 87394 TRPFST-750 FITTING AUTOFLARE 3/4 MPT $13.18 87395 TRPFST-1000 FITTING AUTOFLARE 1 MPT $20.37
FLANGE ADAPTERS X MPT
216975 TRPBFF-375 FITTING FLANGE MOUNT 3/8 FLANGE MOUNT $13.03 87398 TRPBFF-500 FITTING FLANGE MOUNT 1/2 FLANGE MOUNT $12.45 87399 TRPBFF-750 FITTING FLANGE MOUNT 3/4 FLANGE MOUNT $16.14 87376 TRPBFF-1000 FITTING FLANGE MOUNT 1" FLANGE MOUNT $19.32
ACCESSORIES FOR TRAC-PIPE
205455 TRPTC-151 CUTTER TUBE FOR 3/8 - 11/4 $87.79 87381 TRPSP-025 STRIKER PLATE QTR 3X2 $0.68 87380 TRPSP-050 STRIKER PLATE HALF 3X7 $1.33 87379 TRPSP-100 STRIKER PLATE FULL 3X12 $2.76
fwwebb.com/gas
Pictures shown do not necessarily represent the exact model of the product number and description. Pricing is good through March 25, 2015.
200 Locust Street Hartford, CT 06114Tel: 860-722-2433 • 800-243-9360 Fax: 800-274-2004
1913 Atlantic Ave., Suite 20 Manasquan, NJ 08736Tel: 855-664-9322 Fax: 732-233-1583
Technical Corner
Continued on next page.
Fb=.134 Vt ɣ FSFb = Net Buoyancy Force0.134 = Gallon to cubic foot conversion numberVt = Tank Volume in gallonsɣ = Specific gravity of flood water (62.4 for Fresh water, 64.1 for Salt water)FS = Safety correction factor (* 1.3)
Net Buoyancy = Fb - Tank weight - Equivalent Flood Weight of Soil
Number of hold down straps required = Net buoyancy / allowable working load of strap (Minuteman Tie down straps are designed for 3600# seismic lateral load, 5500# breaking strength, 3630# working load)Vc = (Net buoyancy/Density of concrete) Safety correction factor (FS)
Vc = Volume of Concrete Density used 148 lbs per cubic foot
Soil type S, Equivalent fluid Weight of Moist Soil
(lbs per cf)
Equivalent Fluid Weight of Submerged Soil and
Water (lbs per cf)
Clean sand and gravel: GW, GP, SW, SP
30 75
Dirty sand and gravel of restricted permeability: GM, GM-GP, SM, SM-SP
35 77
Stiff residual silts and clays, silty file sands, clayey sands and gravels: CL,ML,CH,MH,SC,GC
45 82
Very soft to soft clay, silty clay, organic silt and clay: CL,ML,OL,CH,MH,OH
100 106
Medium to stiff clay deposited in chunks and protected from infiltration: CL, CH
120 142
Soil Type Group Symbol
Description per USDA Unified Soil Classification
Gravels GW Well-graded gravels and gravel mixtures
GP Poorly graded gravel-sand-silt mixtures
GM Silty gravels, gravel-sand-clay mixtures
GC Clayey gravels, gravel-sand-clay mixtures
Sands SW Well-graded sands and gravelly sands
SP Poorly graded sands and gravelly sands
SM Silty sands, poorly graded sand-silt mixtures
SC Clayey sands, poorly graded sand-clay mixtures
Fine grain silt and clays
ML Inorganic silts and clayey silts
CL Inorganic clays of low to medium plasticity
OL Organic silts and organic silty clays of low plasticity
MH Inorganic silts, micaceous or fine sands or silts, elastic silts
CH Inorganic clays of high plasticity, fine clays
OH organic clays of medium to high plasticity
Tank Size (Vt)
Net tank Buoyancy (Fb) (in fresh
water)
Net tank Buoyancy (Fb) (in
Salt water)
Pad Length
Pad Width
9" pad weight
12" pad weight
# of Straps
required
120 1304 1340 6' 4' 2664 2
250 2718 2792 8.5' 4.5' 4246 2
320 3478 3573 10.5' 4.5' 5245 2
500 5435 5583 11' 5.25 6410 2
1000 10870 11166 17' 5.25' 12580 2
1990 21631 22221 26 6 23088 4
Tank size Tank Diameter
(ft)
Tank Length (ft)
Tank Area
Shroud/Lid size
UG Tank Shroud Volume
(18" -23" cover)
Suggested hole
depth min/max
Equivalent Flood weight of soil (sand only, lightest case)
above tank and pad less shroud volume
120 2.00 5.67 11.3 20" x 24" 5.01/ 6.42 cf 55/60 1385
250 2.50 7.67 19.2 20" x 24" 5.01/ 6.42 cf 61/66 2653
320 2.50 9.50 23.8 20" x 24" 5.01 / 6.42 cf 61/66 3888
500 3.08 10.00 30.8 20" x 24" 5.01 / 6.42 cf 68/73 4341
1000 3.42 15.83 54.1 20" x 24" 5.01 / 6.42 cf 75/80 7989
1990 3.83 23.92 91.7 20" x 24" 5.01 / 6.42 cf 80/85 16219
Tank sizes are for Quality Steel standard Lp tanks other tank sizes might require different pad sizes
FEMA Calculation of Buoyancy for UG LP tanks
Tank Buoyancy calculation Page 1
Note:
Fb=.134 Vt ɣ FSFb = Net Buoyancy Force0.134 = Gallon to cubic foot conversion numberVt = Tank Volume in gallonsɣ = Specific gravity of flood water (62.4 for Fresh water, 64.1 for Salt water)FS = Safety correction factor (* 1.3)
Net Buoyancy = Fb - Tank weight - Equivalent Flood Weight of Soil
Number of hold down straps required = Net buoyancy / allowable working load of strap (Minuteman Tie down straps are designed for 3600# seismic lateral load, 5500# breaking strength, 3630# working load)Vc = (Net buoyancy/Density of concrete) Safety correction factor (FS)
Vc = Volume of Concrete Density used 148 lbs per cubic foot
Soil type S, Equivalent fluid Weight of Moist Soil
(lbs per cf)
Equivalent Fluid Weight of Submerged Soil and
Water (lbs per cf)
Clean sand and gravel: GW, GP, SW, SP
30 75
Dirty sand and gravel of restricted permeability: GM, GM-GP, SM, SM-SP
35 77
Stiff residual silts and clays, silty file sands, clayey sands and gravels: CL,ML,CH,MH,SC,GC
45 82
Very soft to soft clay, silty clay, organic silt and clay: CL,ML,OL,CH,MH,OH
100 106
Medium to stiff clay deposited in chunks and protected from infiltration: CL, CH
120 142
Soil Type Group Symbol
Description per USDA Unified Soil Classification
Gravels GW Well-graded gravels and gravel mixtures
GP Poorly graded gravel-sand-silt mixtures
GM Silty gravels, gravel-sand-clay mixtures
GC Clayey gravels, gravel-sand-clay mixtures
Sands SW Well-graded sands and gravelly sands
SP Poorly graded sands and gravelly sands
SM Silty sands, poorly graded sand-silt mixtures
SC Clayey sands, poorly graded sand-clay mixtures
Fine grain silt and clays
ML Inorganic silts and clayey silts
CL Inorganic clays of low to medium plasticity
OL Organic silts and organic silty clays of low plasticity
MH Inorganic silts, micaceous or fine sands or silts, elastic silts
CH Inorganic clays of high plasticity, fine clays
OH organic clays of medium to high plasticity
Tank Size (Vt)
Net tank Buoyancy (Fb) (in fresh
water)
Net tank Buoyancy (Fb) (in
Salt water)
Pad Length
Pad Width
9" pad weight
12" pad weight
# of Straps
required
120 1304 1340 6' 4' 2664 2
250 2718 2792 8.5' 4.5' 4246 2
320 3478 3573 10.5' 4.5' 5245 2
500 5435 5583 11' 5.25 6410 2
1000 10870 11166 17' 5.25' 12580 2
1990 21631 22221 26 6 23088 4
Tank size Tank Diameter
(ft)
Tank Length (ft)
Tank Area
Shroud/Lid size
UG Tank Shroud Volume
(18" -23" cover)
Suggested hole
depth min/max
Equivalent Flood weight of soil (sand only, lightest case)
above tank and pad less shroud volume
120 2.00 5.67 11.3 20" x 24" 5.01/ 6.42 cf 55/60 1385
250 2.50 7.67 19.2 20" x 24" 5.01/ 6.42 cf 61/66 2653
320 2.50 9.50 23.8 20" x 24" 5.01 / 6.42 cf 61/66 3888
500 3.08 10.00 30.8 20" x 24" 5.01 / 6.42 cf 68/73 4341
1000 3.42 15.83 54.1 20" x 24" 5.01 / 6.42 cf 75/80 7989
1990 3.83 23.92 91.7 20" x 24" 5.01 / 6.42 cf 80/85 16219
Tank sizes are for Quality Steel standard Lp tanks other tank sizes might require different pad sizes
FEMA Calculation of Buoyancy for UG LP tanks
Tank Buoyancy calculation Page 1
Meeting FEMA LP Tank Buoyancy Guidelines
This month, I’m providing specifications to prevent run-away LP tanks in a flood situation. These are based on FEMA tank buoyancy guidelines, issued after Hurricane Katrina, for above or in-ground tanks and containers for the storage of gasoline, water, natural gas, LP, or heating oil.
The info below covers standard LP tanks from Quality Steel Corp. It includes excavation depths for in-ground tanks, pad dimensions, and number of straps necessary to secure a tank. Note, other tank sizes may require different pad sizes.
Only one state I know of requires LP tanks to be tethered. Vermont enacted this requirement after hundreds of LP tanks from the state floated down the Conn. River into Long Island Sound when Hurricane Sandy hit. While not widely mandated, it is still a prudent safety measure to follow the FEMA guidelines and properly secure LP tanks for your customers. It will probably make your local inspector happy, too.
Rich Harvey Gas Training Coordinator
200 Locust Street Hartford, CT 06114Tel: 860-722-2433 • 800-243-9360 Fax: 800-274-2004
1913 Atlantic Ave., Suite 20 Manasquan, NJ 08736Tel: 855-664-9322 Fax: 732-233-1583
Technical Corner
Click link for source material: Coastal Construction Manual
Legend:
Fb=.134 Vt ɣ FSFb = Net Buoyancy Force0.134 = Gallon to cubic foot conversion numberVt = Tank Volume in gallonsɣ = Specific gravity of flood water (62.4 for Fresh water, 64.1 for Salt water)FS = Safety correction factor (* 1.3)
Net Buoyancy = Fb - Tank weight - Equivalent Flood Weight of Soil
Number of hold down straps required = Net buoyancy / allowable working load of strap (Minuteman Tie down straps are designed for 3600# seismic lateral load, 5500# breaking strength, 3630# working load)Vc = (Net buoyancy/Density of concrete) Safety correction factor (FS)
Vc = Volume of Concrete Density used 148 lbs per cubic foot
Soil type S, Equivalent fluid Weight of Moist Soil
(lbs per cf)
Equivalent Fluid Weight of Submerged Soil and
Water (lbs per cf)
Clean sand and gravel: GW, GP, SW, SP
30 75
Dirty sand and gravel of restricted permeability: GM, GM-GP, SM, SM-SP
35 77
Stiff residual silts and clays, silty file sands, clayey sands and gravels: CL,ML,CH,MH,SC,GC
45 82
Very soft to soft clay, silty clay, organic silt and clay: CL,ML,OL,CH,MH,OH
100 106
Medium to stiff clay deposited in chunks and protected from infiltration: CL, CH
120 142
Soil Type Group Symbol
Description per USDA Unified Soil Classification
Gravels GW Well-graded gravels and gravel mixtures
GP Poorly graded gravel-sand-silt mixtures
GM Silty gravels, gravel-sand-clay mixtures
GC Clayey gravels, gravel-sand-clay mixtures
Sands SW Well-graded sands and gravelly sands
SP Poorly graded sands and gravelly sands
SM Silty sands, poorly graded sand-silt mixtures
SC Clayey sands, poorly graded sand-clay mixtures
Fine grain silt and clays
ML Inorganic silts and clayey silts
CL Inorganic clays of low to medium plasticity
OL Organic silts and organic silty clays of low plasticity
MH Inorganic silts, micaceous or fine sands or silts, elastic silts
CH Inorganic clays of high plasticity, fine clays
OH organic clays of medium to high plasticity
Tank Size (Vt)
Net tank Buoyancy (Fb) (in fresh
water)
Net tank Buoyancy (Fb) (in
Salt water)
Pad Length
Pad Width
9" pad weight
12" pad weight
# of Straps
required
120 1304 1340 6' 4' 2664 2
250 2718 2792 8.5' 4.5' 4246 2
320 3478 3573 10.5' 4.5' 5245 2
500 5435 5583 11' 5.25 6410 2
1000 10870 11166 17' 5.25' 12580 2
1990 21631 22221 26 6 23088 4
Tank size Tank Diameter
(ft)
Tank Length (ft)
Tank Area
Shroud/Lid size
UG Tank Shroud Volume
(18" -23" cover)
Suggested hole
depth min/max
Equivalent Flood weight of soil (sand only, lightest case)
above tank and pad less shroud volume
120 2.00 5.67 11.3 20" x 24" 5.01/ 6.42 cf 55/60 1385
250 2.50 7.67 19.2 20" x 24" 5.01/ 6.42 cf 61/66 2653
320 2.50 9.50 23.8 20" x 24" 5.01 / 6.42 cf 61/66 3888
500 3.08 10.00 30.8 20" x 24" 5.01 / 6.42 cf 68/73 4341
1000 3.42 15.83 54.1 20" x 24" 5.01 / 6.42 cf 75/80 7989
1990 3.83 23.92 91.7 20" x 24" 5.01 / 6.42 cf 80/85 16219
Tank sizes are for Quality Steel standard Lp tanks other tank sizes might require different pad sizes
FEMA Calculation of Buoyancy for UG LP tanks
Tank Buoyancy calculation Page 1
Fb=.134 Vt ɣ FSFb = Net Buoyancy Force0.134 = Gallon to cubic foot conversion numberVt = Tank Volume in gallonsɣ = Specific gravity of flood water (62.4 for Fresh water, 64.1 for Salt water)FS = Safety correction factor (* 1.3)
Net Buoyancy = Fb - Tank weight - Equivalent Flood Weight of Soil
Number of hold down straps required = Net buoyancy / allowable working load of strap (Minuteman Tie down straps are designed for 3600# seismic lateral load, 5500# breaking strength, 3630# working load)Vc = (Net buoyancy/Density of concrete) Safety correction factor (FS)
Vc = Volume of Concrete Density used 148 lbs per cubic foot
Soil type S, Equivalent fluid Weight of Moist Soil
(lbs per cf)
Equivalent Fluid Weight of Submerged Soil and
Water (lbs per cf)
Clean sand and gravel: GW, GP, SW, SP
30 75
Dirty sand and gravel of restricted permeability: GM, GM-GP, SM, SM-SP
35 77
Stiff residual silts and clays, silty file sands, clayey sands and gravels: CL,ML,CH,MH,SC,GC
45 82
Very soft to soft clay, silty clay, organic silt and clay: CL,ML,OL,CH,MH,OH
100 106
Medium to stiff clay deposited in chunks and protected from infiltration: CL, CH
120 142
Soil Type Group Symbol
Description per USDA Unified Soil Classification
Gravels GW Well-graded gravels and gravel mixtures
GP Poorly graded gravel-sand-silt mixtures
GM Silty gravels, gravel-sand-clay mixtures
GC Clayey gravels, gravel-sand-clay mixtures
Sands SW Well-graded sands and gravelly sands
SP Poorly graded sands and gravelly sands
SM Silty sands, poorly graded sand-silt mixtures
SC Clayey sands, poorly graded sand-clay mixtures
Fine grain silt and clays
ML Inorganic silts and clayey silts
CL Inorganic clays of low to medium plasticity
OL Organic silts and organic silty clays of low plasticity
MH Inorganic silts, micaceous or fine sands or silts, elastic silts
CH Inorganic clays of high plasticity, fine clays
OH organic clays of medium to high plasticity
Tank Size (Vt)
Net tank Buoyancy (Fb) (in fresh
water)
Net tank Buoyancy (Fb) (in
Salt water)
Pad Length
Pad Width
9" pad weight
12" pad weight
# of Straps
required
120 1304 1340 6' 4' 2664 2
250 2718 2792 8.5' 4.5' 4246 2
320 3478 3573 10.5' 4.5' 5245 2
500 5435 5583 11' 5.25 6410 2
1000 10870 11166 17' 5.25' 12580 2
1990 21631 22221 26 6 23088 4
Tank size Tank Diameter
(ft)
Tank Length (ft)
Tank Area
Shroud/Lid size
UG Tank Shroud Volume
(18" -23" cover)
Suggested hole
depth min/max
Equivalent Flood weight of soil (sand only, lightest case)
above tank and pad less shroud volume
120 2.00 5.67 11.3 20" x 24" 5.01/ 6.42 cf 55/60 1385
250 2.50 7.67 19.2 20" x 24" 5.01/ 6.42 cf 61/66 2653
320 2.50 9.50 23.8 20" x 24" 5.01 / 6.42 cf 61/66 3888
500 3.08 10.00 30.8 20" x 24" 5.01 / 6.42 cf 68/73 4341
1000 3.42 15.83 54.1 20" x 24" 5.01 / 6.42 cf 75/80 7989
1990 3.83 23.92 91.7 20" x 24" 5.01 / 6.42 cf 80/85 16219
Tank sizes are for Quality Steel standard Lp tanks other tank sizes might require different pad sizes
FEMA Calculation of Buoyancy for UG LP tanks
Tank Buoyancy calculation Page 1
FEMA Calculation of Buoyancy for UG LP tanks
Net Buoyancy = Fb - Tank weight - Equivalent Flood Weight of Soil
Number of hold down straps = Net Buoyancy / allowable working load of strap (Minuteman Tie down straps are designed for 3600# seismic lateral load, 5500# breaking strength, 3600# working load)
Vc = (Net buoyancy/Density of concrete) Safety correction factor (FS)Vc = Volume of ConcreteDensity used 148 lbs per cubic foot
Fb=.134 Vt ɣ FSFb = Net Buoyancy Force0.134 = Gallon to cubic foot conversion numberVt = Tank Volume in gallonsɣ = Specific gravity of flood water (62.4 for Fresh water, 64.1 for Salt water)FS = Safety correction factor (* 1.3)
Net Buoyancy = Fb - Tank weight - Equivalent Flood Weight of Soil
Number of hold down straps required = Net buoyancy / allowable working load of strap (Minuteman Tie down straps are designed for 3600# seismic lateral load, 5500# breaking strength, 3630# working load)Vc = (Net buoyancy/Density of concrete) Safety correction factor (FS)
Vc = Volume of Concrete Density used 148 lbs per cubic foot
Soil type S, Equivalent fluid Weight of Moist Soil
(lbs per cf)
Equivalent Fluid Weight of Submerged Soil and
Water (lbs per cf)
Clean sand and gravel: GW, GP, SW, SP
30 75
Dirty sand and gravel of restricted permeability: GM, GM-GP, SM, SM-SP
35 77
Stiff residual silts and clays, silty file sands, clayey sands and gravels: CL,ML,CH,MH,SC,GC
45 82
Very soft to soft clay, silty clay, organic silt and clay: CL,ML,OL,CH,MH,OH
100 106
Medium to stiff clay deposited in chunks and protected from infiltration: CL, CH
120 142
Soil Type Group Symbol
Description per USDA Unified Soil Classification
Gravels GW Well-graded gravels and gravel mixtures
GP Poorly graded gravel-sand-silt mixtures
GM Silty gravels, gravel-sand-clay mixtures
GC Clayey gravels, gravel-sand-clay mixtures
Sands SW Well-graded sands and gravelly sands
SP Poorly graded sands and gravelly sands
SM Silty sands, poorly graded sand-silt mixtures
SC Clayey sands, poorly graded sand-clay mixtures
Fine grain silt and clays
ML Inorganic silts and clayey silts
CL Inorganic clays of low to medium plasticity
OL Organic silts and organic silty clays of low plasticity
MH Inorganic silts, micaceous or fine sands or silts, elastic silts
CH Inorganic clays of high plasticity, fine clays
OH organic clays of medium to high plasticity
Tank Size (Vt)
Net tank Buoyancy (Fb) (in fresh
water)
Net tank Buoyancy (Fb) (in
Salt water)
Pad Length
Pad Width
9" pad weight
12" pad weight
# of Straps
required
120 1304 1340 6' 4' 2664 2
250 2718 2792 8.5' 4.5' 4246 2
320 3478 3573 10.5' 4.5' 5245 2
500 5435 5583 11' 5.25 6410 2
1000 10870 11166 17' 5.25' 12580 2
1990 21631 22221 26 6 23088 4
Tank size Tank Diameter
(ft)
Tank Length (ft)
Tank Area
Shroud/Lid size
UG Tank Shroud Volume
(18" -23" cover)
Suggested hole
depth min/max
Equivalent Flood weight of soil (sand only, lightest case)
above tank and pad less shroud volume
120 2.00 5.67 11.3 20" x 24" 5.01/ 6.42 cf 55/60 1385
250 2.50 7.67 19.2 20" x 24" 5.01/ 6.42 cf 61/66 2653
320 2.50 9.50 23.8 20" x 24" 5.01 / 6.42 cf 61/66 3888
500 3.08 10.00 30.8 20" x 24" 5.01 / 6.42 cf 68/73 4341
1000 3.42 15.83 54.1 20" x 24" 5.01 / 6.42 cf 75/80 7989
1990 3.83 23.92 91.7 20" x 24" 5.01 / 6.42 cf 80/85 16219
Tank sizes are for Quality Steel standard Lp tanks other tank sizes might require different pad sizes
FEMA Calculation of Buoyancy for UG LP tanks
Tank Buoyancy calculation Page 1
Continued from previous page.
= Net Buoyancy Force
= Gallon to cubic foot conversion number
= Tank Volume in gallons
= Specific gravity of flood water(62.4 for Fresh water, 64.1 for Salt water)
= Safety correction factor (* 1.3)
Fb=.134 Vt ɣ FSFb = Net Buoyancy Force0.134 = Gallon to cubic foot conversion numberVt = Tank Volume in gallonsɣ = Specific gravity of flood water (62.4 for Fresh water, 64.1 for Salt water)FS = Safety correction factor (* 1.3)
Net Buoyancy = Fb - Tank weight - Equivalent Flood Weight of Soil
Number of hold down straps required = Net buoyancy / allowable working load of strap (Minuteman Tie down straps are designed for 3600# seismic lateral load, 5500# breaking strength, 3630# working load)Vc = (Net buoyancy/Density of concrete) Safety correction factor (FS)
Vc = Volume of Concrete Density used 148 lbs per cubic foot
Soil type S, Equivalent fluid Weight of Moist Soil
(lbs per cf)
Equivalent Fluid Weight of Submerged Soil and
Water (lbs per cf)
Clean sand and gravel: GW, GP, SW, SP
30 75
Dirty sand and gravel of restricted permeability: GM, GM-GP, SM, SM-SP
35 77
Stiff residual silts and clays, silty file sands, clayey sands and gravels: CL,ML,CH,MH,SC,GC
45 82
Very soft to soft clay, silty clay, organic silt and clay: CL,ML,OL,CH,MH,OH
100 106
Medium to stiff clay deposited in chunks and protected from infiltration: CL, CH
120 142
Soil Type Group Symbol
Description per USDA Unified Soil Classification
Gravels GW Well-graded gravels and gravel mixtures
GP Poorly graded gravel-sand-silt mixtures
GM Silty gravels, gravel-sand-clay mixtures
GC Clayey gravels, gravel-sand-clay mixtures
Sands SW Well-graded sands and gravelly sands
SP Poorly graded sands and gravelly sands
SM Silty sands, poorly graded sand-silt mixtures
SC Clayey sands, poorly graded sand-clay mixtures
Fine grain silt and clays
ML Inorganic silts and clayey silts
CL Inorganic clays of low to medium plasticity
OL Organic silts and organic silty clays of low plasticity
MH Inorganic silts, micaceous or fine sands or silts, elastic silts
CH Inorganic clays of high plasticity, fine clays
OH organic clays of medium to high plasticity
Tank Size (Vt)
Net tank Buoyancy (Fb) (in fresh
water)
Net tank Buoyancy (Fb) (in
Salt water)
Pad Length
Pad Width
9" pad weight
12" pad weight
# of Straps
required
120 1304 1340 6' 4' 2664 2
250 2718 2792 8.5' 4.5' 4246 2
320 3478 3573 10.5' 4.5' 5245 2
500 5435 5583 11' 5.25 6410 2
1000 10870 11166 17' 5.25' 12580 2
1990 21631 22221 26 6 23088 4
Tank size Tank Diameter
(ft)
Tank Length (ft)
Tank Area
Shroud/Lid size
UG Tank Shroud Volume
(18" -23" cover)
Suggested hole
depth min/max
Equivalent Flood weight of soil (sand only, lightest case)
above tank and pad less shroud volume
120 2.00 5.67 11.3 20" x 24" 5.01/ 6.42 cf 55/60 1385
250 2.50 7.67 19.2 20" x 24" 5.01/ 6.42 cf 61/66 2653
320 2.50 9.50 23.8 20" x 24" 5.01 / 6.42 cf 61/66 3888
500 3.08 10.00 30.8 20" x 24" 5.01 / 6.42 cf 68/73 4341
1000 3.42 15.83 54.1 20" x 24" 5.01 / 6.42 cf 75/80 7989
1990 3.83 23.92 91.7 20" x 24" 5.01 / 6.42 cf 80/85 16219
Tank sizes are for Quality Steel standard Lp tanks other tank sizes might require different pad sizes
FEMA Calculation of Buoyancy for UG LP tanks
Tank Buoyancy calculation Page 1
Fb=.134 Vt ɣ FSFb = Net Buoyancy Force0.134 = Gallon to cubic foot conversion numberVt = Tank Volume in gallonsɣ = Specific gravity of flood water (62.4 for Fresh water, 64.1 for Salt water)FS = Safety correction factor (* 1.3)
Net Buoyancy = Fb - Tank weight - Equivalent Flood Weight of Soil
Number of hold down straps required = Net buoyancy / allowable working load of strap (Minuteman Tie down straps are designed for 3600# seismic lateral load, 5500# breaking strength, 3630# working load)Vc = (Net buoyancy/Density of concrete) Safety correction factor (FS)
Vc = Volume of Concrete Density used 148 lbs per cubic foot
Soil type S, Equivalent fluid Weight of Moist Soil
(lbs per cf)
Equivalent Fluid Weight of Submerged Soil and
Water (lbs per cf)
Clean sand and gravel: GW, GP, SW, SP
30 75
Dirty sand and gravel of restricted permeability: GM, GM-GP, SM, SM-SP
35 77
Stiff residual silts and clays, silty file sands, clayey sands and gravels: CL,ML,CH,MH,SC,GC
45 82
Very soft to soft clay, silty clay, organic silt and clay: CL,ML,OL,CH,MH,OH
100 106
Medium to stiff clay deposited in chunks and protected from infiltration: CL, CH
120 142
Soil Type Group Symbol
Description per USDA Unified Soil Classification
Gravels GW Well-graded gravels and gravel mixtures
GP Poorly graded gravel-sand-silt mixtures
GM Silty gravels, gravel-sand-clay mixtures
GC Clayey gravels, gravel-sand-clay mixtures
Sands SW Well-graded sands and gravelly sands
SP Poorly graded sands and gravelly sands
SM Silty sands, poorly graded sand-silt mixtures
SC Clayey sands, poorly graded sand-clay mixtures
Fine grain silt and clays
ML Inorganic silts and clayey silts
CL Inorganic clays of low to medium plasticity
OL Organic silts and organic silty clays of low plasticity
MH Inorganic silts, micaceous or fine sands or silts, elastic silts
CH Inorganic clays of high plasticity, fine clays
OH organic clays of medium to high plasticity
Tank Size (Vt)
Net tank Buoyancy (Fb) (in fresh
water)
Net tank Buoyancy (Fb) (in
Salt water)
Pad Length
Pad Width
9" pad weight
12" pad weight
# of Straps
required
120 1304 1340 6' 4' 2664 2
250 2718 2792 8.5' 4.5' 4246 2
320 3478 3573 10.5' 4.5' 5245 2
500 5435 5583 11' 5.25 6410 2
1000 10870 11166 17' 5.25' 12580 2
1990 21631 22221 26 6 23088 4
Tank size Tank Diameter
(ft)
Tank Length (ft)
Tank Area
Shroud/Lid size
UG Tank Shroud Volume
(18" -23" cover)
Suggested hole
depth min/max
Equivalent Flood weight of soil (sand only, lightest case)
above tank and pad less shroud volume
120 2.00 5.67 11.3 20" x 24" 5.01/ 6.42 cf 55/60 1385
250 2.50 7.67 19.2 20" x 24" 5.01/ 6.42 cf 61/66 2653
320 2.50 9.50 23.8 20" x 24" 5.01 / 6.42 cf 61/66 3888
500 3.08 10.00 30.8 20" x 24" 5.01 / 6.42 cf 68/73 4341
1000 3.42 15.83 54.1 20" x 24" 5.01 / 6.42 cf 75/80 7989
1990 3.83 23.92 91.7 20" x 24" 5.01 / 6.42 cf 80/85 16219
Tank sizes are for Quality Steel standard Lp tanks other tank sizes might require different pad sizes
FEMA Calculation of Buoyancy for UG LP tanks
Tank Buoyancy calculation Page 1
Fb=.134 Vt ɣ FSFb = Net Buoyancy Force0.134 = Gallon to cubic foot conversion numberVt = Tank Volume in gallonsɣ = Specific gravity of flood water (62.4 for Fresh water, 64.1 for Salt water)FS = Safety correction factor (* 1.3)
Net Buoyancy = Fb - Tank weight - Equivalent Flood Weight of Soil
Number of hold down straps required = Net buoyancy / allowable working load of strap (Minuteman Tie down straps are designed for 3600# seismic lateral load, 5500# breaking strength, 3630# working load)Vc = (Net buoyancy/Density of concrete) Safety correction factor (FS)
Vc = Volume of Concrete Density used 148 lbs per cubic foot
Soil type S, Equivalent fluid Weight of Moist Soil
(lbs per cf)
Equivalent Fluid Weight of Submerged Soil and
Water (lbs per cf)
Clean sand and gravel: GW, GP, SW, SP
30 75
Dirty sand and gravel of restricted permeability: GM, GM-GP, SM, SM-SP
35 77
Stiff residual silts and clays, silty file sands, clayey sands and gravels: CL,ML,CH,MH,SC,GC
45 82
Very soft to soft clay, silty clay, organic silt and clay: CL,ML,OL,CH,MH,OH
100 106
Medium to stiff clay deposited in chunks and protected from infiltration: CL, CH
120 142
Soil Type Group Symbol
Description per USDA Unified Soil Classification
Gravels GW Well-graded gravels and gravel mixtures
GP Poorly graded gravel-sand-silt mixtures
GM Silty gravels, gravel-sand-clay mixtures
GC Clayey gravels, gravel-sand-clay mixtures
Sands SW Well-graded sands and gravelly sands
SP Poorly graded sands and gravelly sands
SM Silty sands, poorly graded sand-silt mixtures
SC Clayey sands, poorly graded sand-clay mixtures
Fine grain silt and clays
ML Inorganic silts and clayey silts
CL Inorganic clays of low to medium plasticity
OL Organic silts and organic silty clays of low plasticity
MH Inorganic silts, micaceous or fine sands or silts, elastic silts
CH Inorganic clays of high plasticity, fine clays
OH organic clays of medium to high plasticity
Tank Size (Vt)
Net tank Buoyancy (Fb) (in fresh
water)
Net tank Buoyancy (Fb) (in
Salt water)
Pad Length
Pad Width
9" pad weight
12" pad weight
# of Straps
required
120 1304 1340 6' 4' 2664 2
250 2718 2792 8.5' 4.5' 4246 2
320 3478 3573 10.5' 4.5' 5245 2
500 5435 5583 11' 5.25 6410 2
1000 10870 11166 17' 5.25' 12580 2
1990 21631 22221 26 6 23088 4
Tank size Tank Diameter
(ft)
Tank Length (ft)
Tank Area
Shroud/Lid size
UG Tank Shroud Volume
(18" -23" cover)
Suggested hole
depth min/max
Equivalent Flood weight of soil (sand only, lightest case)
above tank and pad less shroud volume
120 2.00 5.67 11.3 20" x 24" 5.01/ 6.42 cf 55/60 1385
250 2.50 7.67 19.2 20" x 24" 5.01/ 6.42 cf 61/66 2653
320 2.50 9.50 23.8 20" x 24" 5.01 / 6.42 cf 61/66 3888
500 3.08 10.00 30.8 20" x 24" 5.01 / 6.42 cf 68/73 4341
1000 3.42 15.83 54.1 20" x 24" 5.01 / 6.42 cf 75/80 7989
1990 3.83 23.92 91.7 20" x 24" 5.01 / 6.42 cf 80/85 16219
Tank sizes are for Quality Steel standard Lp tanks other tank sizes might require different pad sizes
FEMA Calculation of Buoyancy for UG LP tanks
Tank Buoyancy calculation Page 1
Fb=.134 Vt ɣ FSFb = Net Buoyancy Force0.134 = Gallon to cubic foot conversion numberVt = Tank Volume in gallonsɣ = Specific gravity of flood water (62.4 for Fresh water, 64.1 for Salt water)FS = Safety correction factor (* 1.3)
Net Buoyancy = Fb - Tank weight - Equivalent Flood Weight of Soil
Number of hold down straps required = Net buoyancy / allowable working load of strap (Minuteman Tie down straps are designed for 3600# seismic lateral load, 5500# breaking strength, 3630# working load)Vc = (Net buoyancy/Density of concrete) Safety correction factor (FS)
Vc = Volume of Concrete Density used 148 lbs per cubic foot
Soil type S, Equivalent fluid Weight of Moist Soil
(lbs per cf)
Equivalent Fluid Weight of Submerged Soil and
Water (lbs per cf)
Clean sand and gravel: GW, GP, SW, SP
30 75
Dirty sand and gravel of restricted permeability: GM, GM-GP, SM, SM-SP
35 77
Stiff residual silts and clays, silty file sands, clayey sands and gravels: CL,ML,CH,MH,SC,GC
45 82
Very soft to soft clay, silty clay, organic silt and clay: CL,ML,OL,CH,MH,OH
100 106
Medium to stiff clay deposited in chunks and protected from infiltration: CL, CH
120 142
Soil Type Group Symbol
Description per USDA Unified Soil Classification
Gravels GW Well-graded gravels and gravel mixtures
GP Poorly graded gravel-sand-silt mixtures
GM Silty gravels, gravel-sand-clay mixtures
GC Clayey gravels, gravel-sand-clay mixtures
Sands SW Well-graded sands and gravelly sands
SP Poorly graded sands and gravelly sands
SM Silty sands, poorly graded sand-silt mixtures
SC Clayey sands, poorly graded sand-clay mixtures
Fine grain silt and clays
ML Inorganic silts and clayey silts
CL Inorganic clays of low to medium plasticity
OL Organic silts and organic silty clays of low plasticity
MH Inorganic silts, micaceous or fine sands or silts, elastic silts
CH Inorganic clays of high plasticity, fine clays
OH organic clays of medium to high plasticity
Tank Size (Vt)
Net tank Buoyancy (Fb) (in fresh
water)
Net tank Buoyancy (Fb) (in
Salt water)
Pad Length
Pad Width
9" pad weight
12" pad weight
# of Straps
required
120 1304 1340 6' 4' 2664 2
250 2718 2792 8.5' 4.5' 4246 2
320 3478 3573 10.5' 4.5' 5245 2
500 5435 5583 11' 5.25 6410 2
1000 10870 11166 17' 5.25' 12580 2
1990 21631 22221 26 6 23088 4
Tank size Tank Diameter
(ft)
Tank Length (ft)
Tank Area
Shroud/Lid size
UG Tank Shroud Volume
(18" -23" cover)
Suggested hole
depth min/max
Equivalent Flood weight of soil (sand only, lightest case)
above tank and pad less shroud volume
120 2.00 5.67 11.3 20" x 24" 5.01/ 6.42 cf 55/60 1385
250 2.50 7.67 19.2 20" x 24" 5.01/ 6.42 cf 61/66 2653
320 2.50 9.50 23.8 20" x 24" 5.01 / 6.42 cf 61/66 3888
500 3.08 10.00 30.8 20" x 24" 5.01 / 6.42 cf 68/73 4341
1000 3.42 15.83 54.1 20" x 24" 5.01 / 6.42 cf 75/80 7989
1990 3.83 23.92 91.7 20" x 24" 5.01 / 6.42 cf 80/85 16219
Tank sizes are for Quality Steel standard Lp tanks other tank sizes might require different pad sizes
FEMA Calculation of Buoyancy for UG LP tanks
Tank Buoyancy calculation Page 1
Fb=.134 Vt ɣ FSFb = Net Buoyancy Force0.134 = Gallon to cubic foot conversion numberVt = Tank Volume in gallonsɣ = Specific gravity of flood water (62.4 for Fresh water, 64.1 for Salt water)FS = Safety correction factor (* 1.3)
Net Buoyancy = Fb - Tank weight - Equivalent Flood Weight of Soil
Number of hold down straps required = Net buoyancy / allowable working load of strap (Minuteman Tie down straps are designed for 3600# seismic lateral load, 5500# breaking strength, 3630# working load)Vc = (Net buoyancy/Density of concrete) Safety correction factor (FS)
Vc = Volume of Concrete Density used 148 lbs per cubic foot
Soil type S, Equivalent fluid Weight of Moist Soil
(lbs per cf)
Equivalent Fluid Weight of Submerged Soil and
Water (lbs per cf)
Clean sand and gravel: GW, GP, SW, SP
30 75
Dirty sand and gravel of restricted permeability: GM, GM-GP, SM, SM-SP
35 77
Stiff residual silts and clays, silty file sands, clayey sands and gravels: CL,ML,CH,MH,SC,GC
45 82
Very soft to soft clay, silty clay, organic silt and clay: CL,ML,OL,CH,MH,OH
100 106
Medium to stiff clay deposited in chunks and protected from infiltration: CL, CH
120 142
Soil Type Group Symbol
Description per USDA Unified Soil Classification
Gravels GW Well-graded gravels and gravel mixtures
GP Poorly graded gravel-sand-silt mixtures
GM Silty gravels, gravel-sand-clay mixtures
GC Clayey gravels, gravel-sand-clay mixtures
Sands SW Well-graded sands and gravelly sands
SP Poorly graded sands and gravelly sands
SM Silty sands, poorly graded sand-silt mixtures
SC Clayey sands, poorly graded sand-clay mixtures
Fine grain silt and clays
ML Inorganic silts and clayey silts
CL Inorganic clays of low to medium plasticity
OL Organic silts and organic silty clays of low plasticity
MH Inorganic silts, micaceous or fine sands or silts, elastic silts
CH Inorganic clays of high plasticity, fine clays
OH organic clays of medium to high plasticity
Tank Size (Vt)
Net tank Buoyancy (Fb) (in fresh
water)
Net tank Buoyancy (Fb) (in
Salt water)
Pad Length
Pad Width
9" pad weight
12" pad weight
# of Straps
required
120 1304 1340 6' 4' 2664 2
250 2718 2792 8.5' 4.5' 4246 2
320 3478 3573 10.5' 4.5' 5245 2
500 5435 5583 11' 5.25 6410 2
1000 10870 11166 17' 5.25' 12580 2
1990 21631 22221 26 6 23088 4
Tank size Tank Diameter
(ft)
Tank Length (ft)
Tank Area
Shroud/Lid size
UG Tank Shroud Volume
(18" -23" cover)
Suggested hole
depth min/max
Equivalent Flood weight of soil (sand only, lightest case)
above tank and pad less shroud volume
120 2.00 5.67 11.3 20" x 24" 5.01/ 6.42 cf 55/60 1385
250 2.50 7.67 19.2 20" x 24" 5.01/ 6.42 cf 61/66 2653
320 2.50 9.50 23.8 20" x 24" 5.01 / 6.42 cf 61/66 3888
500 3.08 10.00 30.8 20" x 24" 5.01 / 6.42 cf 68/73 4341
1000 3.42 15.83 54.1 20" x 24" 5.01 / 6.42 cf 75/80 7989
1990 3.83 23.92 91.7 20" x 24" 5.01 / 6.42 cf 80/85 16219
Tank sizes are for Quality Steel standard Lp tanks other tank sizes might require different pad sizes
FEMA Calculation of Buoyancy for UG LP tanks
Tank Buoyancy calculation Page 1
0
Continued from previous page.