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UNDERGROUND YANKINSTALLATION
<br />Design for Anchorage Against Buoyancy
<br />YANK DATA
<br />(, Tank Model No- ., 20 k T*E1Q,.. _.
<br />ii Nemroel Capacity�_gallons
<br />i.� Prima,/ Tank Ins. Did. 113 1,,.
<br />Outside Diameter _WL -In.
<br />in.
<br />rJ Over Length _ ft. s - r-, mind waiq
<br />C�,I No. of Sumps
<br />0) Sump Diameter 9R in.
<br />INSTALLATION DATA
<br />Cal, Burial Depth, ft
<br />Al
<br />(sl Design Groundwater Depth, It
<br />6 -
<br />lo Slab Thickness, inches
<br />Concrete Slab
<br />Required. Which case applies will depend on the
<br />•a
<br />Ileo >srealorlhon Ion
<br />Ili Blab Width, ft
<br />_ly,5
<br />,as. z. the
<br />74 ncclumioq.whorlnhevzr
<br />Slab Length, ft
<br />y2
<br />'dtl
<br />Q
<br />-
<br />a ,moiler.
<br />Note' IDis inloimciion'a fo be fmnirhed by lha icnk owner for lha purposes
<br />or deferminlnq mn4 anlih, r. require N, ThevalmiN .mo dzsign I:
<br />d' ectiy tlopentleM on 16e accuracy ci ibis information. rho lank ow
<br />i
<br />responsible for the design for imlailutlon eontlillons other than rfafedrner^in,
<br />The installation of underground fuel storage tanks can be
<br />Al
<br />classified into one of two conditions: either Case 1, No
<br />a
<br />Anchorage Required, or Case 2, Additional Anchorage
<br />Concrete Slab
<br />Required. Which case applies will depend on the
<br />•a
<br />installation conditions being designed for. This design of
<br />0
<br />the tank installation applies to the tank in the installed
<br />0 E
<br />'
<br />ion only. tank may require external hciddwvn to
<br />r
<br />Y 9f
<br />resist buoyancy during9 repairs or
<br />installation or durin P
<br />Backfill above tank top
<br />xli i n f the tank. Th lank installer is responsible for
<br />e umalo o h t e P
<br />Q
<br />conditions encountered dining installation. Extreme caution
<br />Ibs/sgft
<br />CASE 1
<br />must be exercised in all tank handling operations,
<br />3
<br />N`iJ J
<br />STEP i Determ ua the Heights of Zones 1-3
<br />On the diagram at the right draw a line indicating the
<br />relative elevation of the Design Groundwater Depth. Once
<br />the Cosign groundxater Depth has been established on
<br />the diagram fill in the values of wet and dry heights for
<br />each once in the table below. All heights must be
<br />expressed in feet,
<br />I Zor e No
<br />Desaiptlon
<br />Dry Ht a
<br />Wg�et Ht, fi�r
<br />I
<br />Concrete Slab
<br />/
<br />•a
<br />ft x 37.6 =
<br />0
<br />as / sq ft
<br />0 E
<br />'
<br />-
<br />2
<br />Backfill above tank top
<br />00 Unit weight of Dry Slab 0 ft x 150.0 =
<br />Q
<br />Unit weight of Wet Slab Oft x 67.6 =
<br />Ibs/sgft
<br />n
<br />e Unit weight of Df Zone 2 -
<br />3 � Y ft x 100.0 -
<br />Ibsls9 ft
<br />3
<br />N`iJ J
<br />Backfill between
<br />t + e
<br />boCom and tap of tank
<br />IV
<br />..( 0
<br />e
<br />f /
<br />X9.5 1
<br />STEP 2 - Determine the Net Buoyancy of Tank in Zone 3
<br />Choose theappropriate chart to suit the diameter of the tank based on
<br />the table at the right. From the appropriate chart determine the net
<br />buoyancy for Zone 3 and the weight of the tank heads. To find the Net
<br />Buoyancy, enter the chart at the Design Groundwater Depth on the
<br />horizontal axis, move vertically until intersecting the curve representing
<br />the design Burial Depth , move horizontally to the left to read the Net
<br />5ucyancy, IEs per foot of lank length, off of the vertical axis.
<br />CASE2
<br />STEP 3 - Determine the Total Net Uplift
<br />NILJhPIy the tank lengib by the Net Buoyancy to determine the Length
<br />Buoyancy. Subbact the weight of the tank heads from the Length
<br />Buoyancy to determine the Total Net Uplift
<br />38 _ft. Tank Length (5)
<br />x y000 lbs/ft Net Budno_
<br />2y` 152000 be TANK BUOYANCY
<br />62.000 -lbs Tank Buoyancy (22)
<br />- _/500 Its Weightot Tank Heads (21)
<br />QD ii SOO Iss TOTAL NET UPLIFT
<br />5 TEP 4 - Uetermine if Design is Required
<br />9
<br />If toe Total Net Uplift determined Step is a ne ativa number, then the
<br />n n t 3
<br />P P 9
<br />lank will not be subject to uplift tortes for the specified9 design conditions,
<br />' no anchorage is required, and no further analysis is required. The owner
<br />should verify the design conditions with a qualified geotechnical engineer or
<br />hydrologist.
<br />zona 1
<br />Zone 2�
<br />Zane 3
<br />I
<br />§g Net Buoyancy of Tank and Backfill above Tanktop 4000 Ibs / ft of tank length
<br />Weight of lank heads (from note on buoyancy chart) 0 0 Ibs, total for both
<br />STEP 11 - Determine the Number of Anchor Straps
<br />Gvtde the Total Anchorage Load by the Allowable Load per Anchor Strap to determine the
<br />nnimunl number of anchor straps required- The A!lowable Load per Anchor Strap must
<br />be provided by the anchor strap manufacturer. Round Lha minimum number of anchor
<br />straps up to the nearest whole number.
<br />-Iles. Total Anchorage Load (39)
<br />- _ _ Ibs/strap_ Allowable Load (50)_
<br />U _minimum number of anchor straps
<br />e) Number of Anchor Straps Used
<br />S rEP 12 - Determine the. Anchor Shap Locations
<br />Anchor straps must be located to avoid any lanktop hardware, piping, sumps, manholes.
<br />and risers. The desired spacing is the tank length divided by the number of straps. If an
<br />odd number of straps are used, one strap should be located on the tank centerline or within
<br />12' of the lank centerline If there Is an obstruction at the centerline. If the center strap
<br />cannot be located wthin these criteria than increase the number of straps by one.
<br />If the Tota: Net Uplift determined in Step 3 is a positive number, then the
<br />tank will be subject to uplift forces for the specified design conditions.
<br />These forces must be counteracted by the backfill or This backfill by itself
<br />is iinsufficient, by the backfil and the addition of deadman anchors
<br />Determine the Design Uplift Force and proceed to Step 5,
<br />/S_aS06 fies Total Net Uplift (23)
<br />x 150 minimum Sibet Factor __
<br />0 =2_5QIbs DESIGN UPLIFT FCRCE
<br />STEP 5 Determine the Unit Weight of Backfill and Slab
<br />Separate) deterini e the weight of ac ' and slab aerial for both the wet and
<br />Separately 1 g t b k,d n materials r n
<br />diry conditions for Zones 1 8 2. This weight will be determined in terms of unit
<br />weight per square foot of plan area. Add all of the Individual weights to
<br />determine the Unit Weight of Cover.
<br />Height Unit WT
<br />of area of ME'[
<br />^5n'
<br />U R weight of Dry Slab
<br />ft x 87.6 =
<br />Umt weight o[Wet Slab
<br />Its /sq ft
<br />Unit weight of Dry Backill
<br />500
<br />Unit weight of Wet Backfill
<br />ft x 150.0 =_I50
<br />Itis / sq ft
<br />ft x 87.6 =
<br />0
<br />Its /sq ft
<br />ft x 100.0 =
<br />500
<br />Its /sgft
<br />ft x 37.6 =
<br />0
<br />as / sq ft
<br />(9) UNIT WEIGHT OF COVER = 6 $0 be / sq ft of plan area
<br />STr:P 6 Determine Void Volume at Sump Locations
<br />If no surly risers are used on the installation enter zero (0) on lines 33 and
<br />34 and proceed to Step 7. Otherwise, determine the amount of holddown
<br />force lost in the sump zones. From the chart at right locate the volume
<br />fact,, for the size of the sumps being used.
<br />(.,2 9. 62_cu. ft. / ft. Sump Volume Factor
<br />-ii 0 --it, / sq ft Un Weight of Gover (3U)
<br />v
<br />62S3 bs SUMP DISPLACEMENT
<br />_GZS 3- its. Sump Displacement (33)
<br />x / No. of Sumos (6)
<br />3 lbs TOTAL SUMP DISPLACEMENT
<br />&2_.5___.
<br />STEP'7 - Determine Total Holddown Provided by Installation
<br />Determine Gross Backfill Weight of the Installation by multiplying the Unit
<br />Weight of Cover (30) by the tank dimensions. From this number subtract
<br />the Total Sump Displacement (34) to determine the Holddown Provided by
<br />Installation.
<br />_J -14 -in. Tank Diameter (4)
<br />- 12.00 in. f It.
<br />(sit. 9, Jr R, TANK DIAMETER
<br />9.5 ft. Tank Diameter (35)
<br />y_ 3 8 ft. Tar:k Length_ (5)
<br />C 361 sq. ft. TANK SHADOW AREA
<br />361 ser ft, Tank Shadow Area 36
<br />x 656 Ibs/soft Unit Weip htof Cover_30)
<br />239650 Its. GROSS BACKFILL WEIGHT
<br />23q660 Ibs. Gross Backfill Weight (37)
<br />- 6253 lbs. Total Sump Displacement (34)
<br />27,2397 has. HOLDDOWN PROVIDED BY INSTALLATION
<br />STEP 8 - Determine Total Anchorage Load
<br />Determine the Total Anchorage Load by subtracting the Holddown Provided
<br />by Installation from the Design Uplift Force. If the Total Anchorage Load is a
<br />negative number then no anchorage is required for the Installed Condition
<br />and no further analysis is necessary.
<br />if the Total Anchorage Load is a positive number then anchorage Is required
<br />F -,cooed to Step 9.
<br />75-(7- Its. Design Uplift For,, (25)
<br />-28397 lbs,___ Holddown Provided by Installation (38)_
<br />(s) �' 26l lbs. TOTAL ANCHORAGE LOAD
<br />STEP 9 - Determinevaila Holddo n
<br />w A ble from Anchors
<br />Separately de.ermine the weight of backfill and slab materials for both the
<br />of Pertinent Desigtl Data
<br />wet and dr conditiors forEunice
<br />1 2 & 3. This weight will be determined 1rm red
<br />9
<br />in
<br />terms of unit weight r square h e ua e foot of Ian area Add all o the Individual
<br />9 P f In i idiot
<br />9
<br />k %VGF 10
<br />weights to determine the Holddown Available from Anchors.
<br />Net Tank Buoyancy, as per fret
<br />Height Unit WT
<br />2.
<br />of area of Mort
<br />20 000
<br />00 Unit weight of Dry Slab 0 ft x 150.0 =
<br />Its / sq ft
<br />Unit weight of Wet Slab Oft x 67.6 =
<br />Ibs/sgft
<br />n
<br />e Unit weight of Df Zone 2 -
<br />3 � Y ft x 100.0 -
<br />Ibsls9 ft
<br />Unit weight of Wet Zone 2 OR x 37.6 =
<br />the / sq ft
<br />t Unit weight of L'ry Zone 3 0__ft X 1000 =
<br />Its /sgft
<br />Unit weght of Wet Zone 3 (eft x 376 =_
<br />lbs / sic ft
<br />©a HOLDDOWN AVAILABLE FROM ANCHORS =
<br />lbs / set ft
<br />x
<br />_ ft, tank length (5)
<br />Ni HCl DDOW N AVAILABLE FROM ONE ANCHOR =
<br />Ibs / ft of width
<br />x
<br />2 anchors per tank
<br />.a. TOTAL CLDUOWN AVAILABLE FROM ANCHORS RS -
<br />Its r ft of width of each c anchor
<br />STEP 10 - Determine Required Width of Deadman Anchors
<br />Determine the required width of deadman anchors by Dividing the Total Anchorage Load by the Total
<br />Holddown Available from Anchors. This is the width of each deadman which must lie entirely outside the tank
<br />shadow. If the width of the tank shadow plus the width of the two deadman archers exceeds the width of the
<br />concrete slab at rade then the concrete slab must be widened wi en d to at least the combined width of e true lis
<br />9 h th ar
<br />P
<br />the two deadman anchors. On multiple tank installations, the tank spacing most be at least the width of two
<br />deadman anchors side by side.
<br />Ips. Total Anchorage Load (39)
<br />lbs/ft width Total Holddown Available from Anchors
<br />Cr _
<br />-ft. REQUIRED WIDTH OF DEADMAN ANCHORS
<br />■■ ■ ■rrn ■ ■rr r■ rr r r r r r■ r rrrr ■ rr r■ rr r rr ■ r r■■■■ r r n■ r r r r r■• r r■■■■■ r■ ri N r r r r r r
<br />mosso r■■ r r r n■■■ r r r r■ r r r r r r EMISSION r r r r r r u r n rr rr ■ ■rrrr■ ■■■ r r r r r r r r r■ rr ■■ ■r ■■■ ■r ■ rrrrr ■ r r■ r■■ r rr ■ r r r r r r■■ ■■ r s r r o r r r r r r e r r r s r■ r■■■ r r r r■■■■ r■ ■r ■■ r r r r r r r on No ■r ■■■■ r r r r r r r r r ■■ r■ rt•1 ■ ■0 ■rrn■r r n ■■■■ rr ■ ■r r r n ■rr■ r r r 1111111 r e on r r r r r r■■■■ Is r r r■ r■
<br />Even number of straps used? ❑ Yes ❑ No
<br />If yes then enter the number of straps in 53 below and calculate the strap spacing.
<br />If no than answer the following question.
<br />Can the center strap be located within 12" of the tank centerline? ❑ Yes 140
<br />If yes then enter the number of straps used in 53 below.
<br />If no, then Increase the number of straps used in (52) by one and enter this number in (53) below.
<br />3j? NUMBER OF ANCHOR STRAPS USED
<br />Tank Length, (5)
<br />Number of Anchor Straps, (53)
<br />1 ft. ANCHOR STRAP SPACING
<br />NOTE: Anchor straps may be moved 35No from this spacing to avoid lanktop obstructions.
<br />STEP 13 - Obtain Deadman Anchor Design from a Qualified Professional
<br />From a qualified design professional obtain a design of the deadman anchors, anchor attachment hardware, and
<br />embedded hardware including the size, style, and material specifications of each component. The design must also
<br />include specifications for corrosion protection of the entire system assembly including the straps, attachment hardware
<br />and embedded hardware. Also, the qualified design professional should provide a drawing showing the size, shape,
<br />reinforcement, and location of the deadman anchors and the details of installation of the entire anchor system.
<br />To insure consistency In the design, provide the qualified design professional wan a copy of Form A describing the details
<br />Of the installation including the tank dimensions, Borlel Depth, Design Groundwater Depth, the Design Uplift Force,
<br />Holddown Provided by Installation, Total Anchorage Load, Anchor Strap Specifications, Allowable Load per Anchor Strap,
<br />Number of Straps Used, Anchor Strap Spacing, and a drawing showing any obstructions on the lanktop.
<br />ON
<br />UNDERGROUND TANK INS TALLATION
<br />Design for Anchorage Against Buoyancy
<br />50. Allowable Load per Anchor Strap, lbs
<br />53. Number of Anchor Straps Used
<br />54. Anchor Strap Spacing, ft.
<br />d
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<br />California
<br />Petroleum
<br />Equipment
<br />Inc.
<br />P.O. Box 9364 Fresno
<br />Calif. 93792
<br />Off (209)276-1881
<br />Fax(209)276-1881
<br />Up. ►432613 A B C61 HAZ
<br />DRAWN
<br />Bryce Ruschhaupt
<br />CHECKED
<br />DATE
<br />SCALE
<br />Joe NO.
<br />L
<br />oal.
<br />12
<br />Summary
<br />of Pertinent Desigtl Data
<br />1.
<br />Tank Model No.20
<br />k %VGF 10
<br />20,
<br />Net Tank Buoyancy, as per fret
<br />7%000 _
<br />2.
<br />Nominal Capacity, gal
<br />20 000
<br />21,
<br />Weight of Heads, Ibs
<br />/500
<br />22.
<br />Tank Buoyancy, to.
<br />4.
<br />Outside Diameter, in.
<br />'I
<br />Z/ T
<br />23.
<br />Total Net Uplift, Ibs
<br />50500
<br />5,
<br />Overall Length, ft.
<br />3_
<br />24.
<br />Holddow, Safety Factor
<br />/.6
<br />6.
<br />No. of Sumps
<br />1
<br />25.
<br />Design Uplift Force, Its
<br />22S %Sfi
<br />7.
<br />Sump Diameter, in.
<br />9.Z
<br />8,
<br />Burial Depth, ft.
<br />6
<br />30.
<br />Unit Weight of Cover, Ibis / sq ft
<br />6 SO
<br />- 9.
<br />Groundwater Depth, R.
<br />6
<br />10,
<br />Slab Thickness, in.
<br />/ 2
<br />34,
<br />Total Sump Displacement, Es
<br />2 5
<br />11.
<br />Slab Width, ft.
<br />12.
<br />Slab Length, ft.
<br />4 z
<br />36.
<br />Tank Shadow Area, sq ft
<br />13.
<br />Dry HT, Zone 1, ft.
<br />�
<br />14,
<br />Wet HT, Zane 1, ft.
<br />0
<br />33.
<br />Holtldown Provided by Installation, Has
<br />27.&397
<br />15.
<br />Dry HT, Zone 2, ft.
<br />5 _
<br />39.
<br />Total Anchorage Load, Its
<br />.Z6.
<br />16.
<br />Wet Hl', Zone 2, ft.
<br />0
<br />17,
<br />Cry HT, Zone 3, ft.
<br />_ 0
<br />48.
<br />Total holddown available from anchors,
<br />Ida / H
<br />18.
<br />Wel HT, Zone 3, ft.
<br />9. rJ
<br />49.
<br />Required width of deadman anchors, ft
<br />50. Allowable Load per Anchor Strap, lbs
<br />53. Number of Anchor Straps Used
<br />54. Anchor Strap Spacing, ft.
<br />d
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<br />California
<br />Petroleum
<br />Equipment
<br />Inc.
<br />P.O. Box 9364 Fresno
<br />Calif. 93792
<br />Off (209)276-1881
<br />Fax(209)276-1881
<br />Up. ►432613 A B C61 HAZ
<br />DRAWN
<br />Bryce Ruschhaupt
<br />CHECKED
<br />DATE
<br />SCALE
<br />Joe NO.
<br />L
<br />oal.
<br />12
<br />
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