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Got Grease DMC 5-06 5/11/06 10:05 AM Page 1
Grease Interceptors
Dormont offers a full line of grease interceptorsfor installation on cooking/prep sinks, pot, pan &scullery sinks and dishwasher applications.Dormont offers a variety of interceptor configura-tions including: on-floor, recessed with & withoutextension and recessed with access housing.Dormont grease interceptors are available withno-hub or threaded connections. Make Dormontyour source for grease interceptors.
Design & Operation
Grease interceptors are designed to preventgreasy substances from entering plumbing systems, septic fields and wastewater treatmentfacilities, where they are difficult to process andcan create a number of environmental problems.Grease interceptors are commonly specified inrestaurant kitchens and food handling or processing areas to keep drainage systems free ofproblematic grease accumulations.
Grease interceptors work by collecting all lighter-than-water substances, such as grease, inside theinterceptor. This is accomplished through the useof a flow restrictor on the inlet side of the interceptor, which slows incoming effluent andredirects it through baffling inside the interceptor.This slowing and baffling process allows lighter-than-water substances to accumulate inside theinterceptor above the static water line.
Design criteria is determined by plumbing codeand typically follows the guidelines set forth bythe Plumbing & Drainage Institute (PDI), whichtests and rates interceptors. The accepted industryand PDI standard (PDI-G101) is to maintain 90%separation efficiency, up to the rated grease retention capacity (in lbs.).
Material & CharacteristicsEpoxy Coated Steel - Interceptor body standard 11 ga. CR steel, with oven cured, acid resistant baked gray epoxy coating, inside and out. Lid isepoxy coated 1⁄4" skid-proof checker plate steel, gasketted, and secured with Allen head center bolt(s). All stainless steel construction may bespecified for high sanitary applications.
Flow Restrictor - WD Series Interceptors are supplied with an external cast iron flow restrictor. All other interceptor models are designed with abuilt-in stainless steel flow restrictor plate, located just inside the inlet.
2
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AInterceptorCatalog Inlet &
WD-4 2"(51)WD-7 2"(51)WD-10 2"(51)
Number Outlet
BBase toCenter
CTop toCenter
D
Length
E
Width
F
HeightGreaseCapacity
Lbs
81420
7-3/4"(197)8-1/2"(216)8-1/2"(216)
3-1/4"(83)3-1/2"(89)3-1/2"(89)
16"(406)18"(457)
21-3/4"(552)
10"(254)13"(330)14"(356)
11"(279)12"(305)12"(305)
WD-15 2"(51)30 10-1/2"(267) 3-1/2"(89) 22"(559) 15"(381) 14"(356)WD-20 3"(76)WD-25 3"(76)WD-35 3"(76)
405070
11-1/2"(292)12"(305)14"(356)
3-1/2"(89)4-1/2"(114)
5"(127)
24"(610)26"(660)30"(762)
15-3/4"(400)16-1/2"(419)
18"(457)
15"(381)16-1/2"(419)
19"(483)WD-50 4"(102)100 16"(406) 5-1/2"(140) 32"(813) 22"(559) 21-1/2"(546)
CIAPMO
U P C
TM
503525201510
74
FlowRateGPM
3/8"(10)Air Space
Baked EpoxyCoated Body
One-pieceRemovableBaffle
NeopreneGasket
LockingDeviceSecured
Non-slipCover
Note: *Optional Threaded Inlet And Outlet(includes Threaded Flow Control)
IntegralDeep SealTrap
FixedSedimentBaffle
Clean-outPlug
Air ReliefBy-pass
No-hub(MJ)Inlet &Outlet (*)
StaticWaterLevel
D x E
WD Series PDI Certified GreaseInterceptors
SPECIFICATION: Dormont WD Series PDICertified recessed or floor mountedepoxy coated steel grease interceptorwith gasketted solid steel cover, hexhead center bolt(s), removable baffleassembly, deep seal trap with cleanout,no hub connections (standard), andexternal cast iron flow control fitting.
Got Grease DMC 5-06 5/11/06 10:05 AM Page 3
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AInterceptorCatalog Inlet &
WD-7-A 2"(51)WD-10-A 2"(51)WD-15-A 2"(51)
Number Outlet
BBase toCenter
CTop toCenter
D
Length
E
Width
F
Height
GreaseCapacity
Lbs
142030
8-1/2"(216)8-1/2"(216)
10-1/2"(267)
3-1/2"(89)3-1/2"(89)3-1/2"(89)
18"(457)21-3/4"(552)
22"(559)
13"(330)14"(356)15"(381)
12"(305)12"(305)14"(356)
WD-20-A 3"(76)WD-25-A 3"(76)WD-35-A 3"(76)
405070
11-1/2"(192)12"(305)14"(356)
3-1/2"(89)4-1/2"(114)
5"(127)
24"(610)26"(660)30"(762)
15-3/4"(400)16-1/2"(419)
18"(457)
15"(381)16-1/2"(419)
19"(483)WD-50-A 4"(102)WD-75-A 4"(102)
100150
16"(406)18-1/2"(470)
5-1/2"(140)5-1/2"(140)
32"(813)36"(914)
22"(559)24"(610)
21-1/2"(546)24"(610)75
5035252015107
FlowRateGPM
THREADED CONNECTION(STANDARD)
WD-A Series Semi-Automatic Draw-OffGrease Interceptors
SPECIFICATION: Dormont WD-A Seriesrecessed or floor mounted epoxy coatedsteel semi-automatic draw-off grease inter-ceptor with gasketted solid steel cover,hex head perimeter bolt(s), removablegrease accumulating cover and baffleassembly, deep seal trap with cleanout,threaded connections (standard), internalstainless steel flow control fitting, flexibledraw-off hose, and line shut-off valve.
ALL SPECIALORDER
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F
C
B
AInterceptorCatalog Inlet &
WD-20-L 3"(76)WD-35-L 4"(102)
†WD-50-L 4"(102)
Number Outlet
BBase toCenter
CTop toCenter
D
Length
E
Width
F
Height
GreaseCapacity
Lbs
4070
100
7-1/2"(191)7"(178)
8-1/2"(216)
4-1/4"(108)4-1/2"(114)5-1/2"(140)
34-7/8"(886)40-7/8"(1038)
55"(1397)
22-7/8"(581)32-7/8"(835)
33"(838)
11-3/4"(305)11-7/8"(302)
14"(356)
SecuredNon-slipCoverLockingDevice
NeopreneGasket
One-pieceRemovableBaffle
StaticWaterLevel
Baked EpoxyCoated Body
3/8"(10)Air Space
Note: *Optional Threaded Inlet And Outlet(includes Threaded Flow Control)
FixedSedimentBaffle
IntegralDeep SealTrap
No-hub(NH)(MJ)Inlet &Outlet (*)
Air ReliefBy-pass
Clean-outPlug
503520
FlowRateGPM
† NOTE: NOT PDI CERTIFIED
WD-L Series PDI Certified Low-Rough-InGrease Interceptors
SPECIFICATION: Dormont WD-L SeriesPDI Certified recessed or floor mountedepoxy coated steel low-rough-in greaseinterceptor with gasketted solid steel cover,hex head center bolt(s), removable baffleassembly, deep seal trap with cleanout, nohub connections (standard), and externalcast iron flow control fitting.
SPECIALORDER
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GI-K Series Large CapacityGrease Interceptors
SPECIFICATION: Dormont GI-K Seriesrecessed or floor mounted epoxy coatedcold rolled steel grease interceptor withgasketted epoxy coated skid-proof topsecured with hex head center bolt(s), nohub connections (standard), double walldeep seal trap, and integral stainlesssteel flow control.
AInterceptorCatalog Inlet &
GI-75-K 4"(102)GI-100-K 4"(102)GI-150-K 4"(102)
Number Outlet
BBase toCenter
CTop toCenter
D
Length
E
Width
F
Height
GreaseCapacity
Lbs
150200300
18-1/2"(470)28-1/2"(724)38-1/2"(978)
4-1/2"(114)4-1/2"(114)4-1/2"(114)
39-3/4"(1010)39-3/4"(1010)39-3/4"(1010)
30-3/4"(781)30-3/4"(781)30-3/4"(781)
23"(584)33"(838)
43"(1092)GI-200-K 4"(102)GI-250-K 4"(102)GI-300-K 6"(152)
400500600
36-1/2"(927)39-1/2"(1003)
38"(965)
6-1/2"(165)6-1/2"(165)
10"(254)
52"(1321)52"(1321)76"(1930)
34"(864)34"(864)
48"(1219)
43"(1092)46"(1168)48"(1219)
GI-400-K 6"(152)GI-500-K 6"(152)
8001000
42"(1067)53"(1346)
10"(254)10"(254)
83"(2108)91"(2311)
55"(1397)60"(1524)
52"(1321)63"(1600)
A
D (Length) x E (Width)
Stainless SteelFlow Control Plate
RemovableBaffle
F
Outlet
Double Wall Deep Seal Trap
C
75100150200250300400500
FlowRateGPM
ALL SPECIALORDER
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Grease interceptors are sized according to the rate of incoming flow, in gallons per minute(GPM). Associated with the incoming flow rate is an interceptor's capacity. The rated capacity, in lbs., is listed at twice the flow rate, in GPM. For example, a 10 GPMinterceptor has a rated capacity of 20 lbs
General Procedure:
To Determine the Flow Rate of Each Sink:
1. Calculate the capacity of the sink in cubic inches:
______(LENGTH) x ______(WIDTH) x ______(DEPTH) =_______CU.IN.
2. Convert the capacity from cubic inches to gallons per minute (GPM): _______CU.IN. ÷ 231 = _______GPM.
3. Adjust for displacement: _______GPM x 0.75 = _______GPM.
4. Result is the flow rate required to drain the sink in one minute.*
*Note: If drain down time is not critical, an interceptor with a lesser flow rate, up to half the calculated flowrate may be specified.
Example:
Three compartment pot sink, each compartment 12" x 12" x 15"1. 12" x 12" x 15" = 2160 cu. in. x 3 comp. = 6480 cu. in.
2. 6480 cu. in. ÷ 231 = 28 GPM.
3. 28 GPM x 0.75 = 21 GPM.
A 20 GPM interceptor would permit the sink to drain in slightly more than one minute.
*Discharge from spray hoods is determined by the flow rate of the hood.
Sizing For Multiple Fixtures:
1. Determine the flow rate for each fixture to be serviced by the interceptor.
2. Add together 100% of the largest flow rate, 50% of the second largest, and 25% of all others.
3. Result is the recommended flow rate of the interceptor.
Example:
1. Fixture A: 35 GPM Flow RateFixture B: 26 GPM Flow RateFixture C: 18 GPM Flow RateFixture D: 12 GPM Flow Rate
2. 35 GPM (A) x 100% = 35 GPM26 GPM (B) x 50% = 13 GPM30 GPM (C + D) x 25% = 7.5 GPM
Total Flow Rate = 55.5 GPM
A 50 GPM interceptor is recommended for this installation.
SINK
FLOW CONTROL TEE
AIR INTAKEVENTED WASTE
FLOW CONTROL TEE FLOW CONTROL TEE
SINK SINKVENTED WASTE VENTED WASTEAIR INTAKE AIR INTAKE
ON FLOOR RECESSED RECESSED WITH EXTENSION
Sizing Chart
Typical Configurations
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Dormont Manufacturing Company: 6015 Enterprise Drive, Export, PA 15632 • 1-800-376-6668 • www.dormont.com
A Subsidiary of Watts Water Technologies, inc. © Watts 2004 GRESEPT, Rev. 1, 4-06
Distributed by:
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