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E
<br />Standard Double -Wall
<br />Tanks
<br />Standard Double -Wall Tank
<br />Specifications
<br />Monitoring capabilities -
<br />the following restrictions apply
<br />for the various types of double-
<br />wall tank monitors:
<br />a) Hydrostatic Tank Monitor -
<br />tank burial depth must not
<br />exceed 7' from tank top to
<br />finish grade.
<br />The monitoring cavity must
<br />be4 vented to the atmosphere.
<br />The optional reservoir sensor,
<br />supplied by O/C TANKS, is
<br />designed to automatically vent
<br />the monitoring cavity.
<br />b) Liquid sensors -when
<br />cavity monitors which
<br />Nominal Actual
<br />Tank Model
<br />0
<br />detect the presence of a
<br />liquid are used, the cavity
<br />between the inner and
<br />outer tank may be either
<br />vented to the atmosphere
<br />or sealed.
<br />c) Vacuum monitoring -when
<br />vacuum monitoring is used,
<br />the maximum vacuum is 3"
<br />mercury (1.5 psi maximum).
<br />Tank burial depth must not
<br />exceed three feet.
<br />d) Positive air,pressure
<br />monitoring -when positive
<br />air pressure monitoring is
<br />used, the maximum air
<br />pressure is 3 psi.
<br />e) Gasoline vapor sensors -
<br />when gasoline vapor sensors
<br />are used, the cavity between
<br />the inner and outer tank
<br />may be either vented to the
<br />atmosphere or sealed.
<br />Standard Tank Notes
<br />1. Standard pipe fittings to the
<br />primary tank are 4" NPT
<br />half couplings. All tanks
<br />include one manway with,
<br />at least, three fittings to the
<br />primary tank located in the
<br />manway cover. All other
<br />primary tank fittings are
<br />mounted on the tank. Addi-
<br />tional manways and tank
<br />fittings are available on
<br />made-to-order tanks.
<br />2. Tank bottom deflector plates
<br />are standard under every
<br />manway and fitting.
<br />3. All Model "P" tanks include
<br />a Fiberglas reservoir, used
<br />for leak monitoring, integrally
<br />constructed to the tank top.
<br />The reservoir includes one
<br />4" NPT half coupling fitting
<br />(6" NPT fittings for 10' dia-
<br />meter tanks) mounted on
<br />the top of the reservoir
<br />allowing access to the
<br />cavity between the inner
<br />and outer tank walls.
<br />4. In addition to the monitoring
<br />fitting located in the Fiberglas
<br />reservoir, tanks 4000 gallon
<br />capacity and larger include
<br />one additional monitoring
<br />fitting (4" NPT) located at
<br />the tank top. Near the
<br />manways.
<br />5. Anchoring strap locations
<br />are indicated by arrows on
<br />the side of the tank and on
<br />then 'n
<br />�FTIB .
<br />MAY 0 3 2017
<br />DWT -4P(4) 550
<br />550
<br />ENVIRONMENTAL HEALTH
<br />Number
<br />of 4" NPT
<br />650
<br />1
<br />Num{ F r ,, tf' A,q' n�-f
<br />Primary
<br />Approx.
<br />of 4" Spacing 1
<br />Number Tank
<br />Nominal Cavity
<br />Tank Between
<br />of 22" Fittings
<br />Weight Volume overall
<br />Tank Monitoring- Inner and
<br />Manways ffffrankl
<br />flbs.l foallomil Length
<br />Diameter Fitisms Outer Tank
<br />DWT -4P(4) 550
<br />550
<br />548 1
<br />4
<br />650
<br />iD0
<br />618"
<br />4'
<br />1
<br />1-115"
<br />DWT4P(4) 750
<br />750
<br />724 1
<br />4
<br />800
<br />130
<br />89"
<br />4'
<br />1
<br />1-118"
<br />DWT -4P(4) 1,000
<br />1,000
<br />971 1
<br />4
<br />- 950
<br />160
<br />1113"
<br />4'
<br />1
<br />1-1/8"
<br />DWr-2P(6) 2,500
<br />2,500
<br />2,365 1
<br />6
<br />1,800
<br />210
<br />127-1/2"
<br />6'
<br />2
<br />1-118"
<br />DWr-2P(6) 4,000
<br />4,000
<br />3.918 1
<br />6
<br />2,500
<br />310
<br />19'11-112"
<br />6'
<br />3
<br />1.118"
<br />"DWT -2P(6) 6,000
<br />- 6,000
<br />5,997 1
<br />6
<br />4,600
<br />428
<br />29'&112"
<br />6'
<br />3
<br />1-118"
<br />DWr-2P(8) 6,000
<br />6,000
<br />5,929 1
<br />6
<br />3,400
<br />&'70
<br />199"
<br />a'
<br />3
<br />1-118"
<br />DWT -2P(8) 6,000
<br />81000
<br />7,829 1
<br />6
<br />4,200
<br />470
<br />259"
<br />8'
<br />3
<br />1.118"
<br />DWT -2P(8) 10,000
<br />10,000
<br />9,730 1
<br />6
<br />5,000
<br />580
<br />309"
<br />8'
<br />3
<br />1-1/8"
<br />DWT -2P(8) 12,000
<br />12,000
<br />11,627 1
<br />6
<br />6,000
<br />630
<br />369"
<br />8'
<br />3
<br />1-118"
<br />DWr-2P(10) 15,000
<br />15,000
<br />14,783 1
<br />6
<br />6,500
<br />1,050
<br />29'1"
<br />10•
<br />3
<br />1314"
<br />DWT -2P(10) 20,000
<br />20,000
<br />20,168 1
<br />6
<br />11,000
<br />1,380
<br />383"
<br />10'
<br />3
<br />1314"
<br />'Includes fitting in Fiberglas reservoir
<br />"The 6000 DWr.2P(6) is standard at Mt. Union, PA plant only.
<br />At all other plants, DWT -2P(6) 6000
<br />modal is made to
<br />order.
<br />R
<br />2T
<br />I
<br />6i +.
<br />rro l .
<br />+•2u'a I
<br />a'4_
<br />�3,4"
<br />Model OWF4P141-656 67
<br />�6'fl
<br />0,Ilcnal42"Lonuinmmt Glbr/
<br />2.16
<br />6"L I 6'
<br />3%'
<br />4'0'6' 00
<br />74'4%
<br />ModetOwF4P(4)M
<br />
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