Grease trap sizing worksheet.pdfGrease Trap Sizing Worksheet
13ECEIVED
MAY 15 2006
I~IORTHW�BT ARCHITECTURAL
Name: 2
'�v 1$ 4, Cec�'�- ---COMPANY
pp ��
Address: 0 b C , Suite No.:
• A Grease Trap plumbing permit is required ($165.00 fee). Contact the Pretreatment
Technician (425-672-5755) if you have any questions and also to get signature approval on
this form.
• Dishwashers are not allowed to be connected to a Grease Trap.
• Food disposers are not allowed in a facility served by a Grease Trap and must be disabled or
removed. Solids must be screened out and placed in the solid waste container.
77��i-_t Lp r J. r. /'n n..�,o� !-n rt �'..nr.., �7'+
iriilm �Iri VS Fixture,- Cor 1�iccl— to a Grease irk
F -A xftre Capacity in Cubic
Inches
L x W x D x no. of sinks
Fixture Capacity
in Gallons
Cu. In. - 231
Drain -acre Lead
(75% of Total
Capacity)
Flow R?te. for
a 2 -Minute
Drain Period
#1
x x x = c.i.
231 = al.
x .75 = Eal.
� 2 =gpm
92
x x x — c.i.
_ 231 = gal.
x .75 = al.
_ 2 =gpm
#3
x x x — c.i.
_ 231 = al.
x .75 = gal.
� 2 =gpm
#4
x x x = c.i.
- 231 = al.
x.75 = al.
-.2 Um
Grease Trap #1— Total drainage flows from maximum of 4 fixtures
gpm
x x x — c.i.
- 231 = al.
x.75 = al.
2 = m
r#3
x x x — c.i.
_ 231 = gal.
x.75 = al.
_2= m
x x x = c.i.
_ 231 = gal.
I x.75 = gal.
_ 2 = gpm
#4
x x x — ca.
-231 = al.
x.75= al.
;2= m
Grease Trap 92 — Total drainage flows from maximum of 4 fixtures
gpm
MINIMUM SIZE OF GREASE TRAP(S) REQUIRED
gpm
77��i-_t Lp r J. r. /'n n..�,o� !-n rt �'..nr.., �7'+
iriilm �Iri VS Fixture,- Cor 1�iccl— to a Grease irk
i
1.
1
2
'�
3
rl
`P
Grease Trap Size (in m
20
25
1 35
1 50
Upsize for factors such as high volume dishwashing, high oil/grease content on menu, etc.
--------------------------------------- (For City use only below this line) ---- _...__
Remarks: 54-iLSLAO
r`�
Size Approved: gpm Approved by: � Date: IVSD
retreatment Technician
CTS "-, 0 J U N - 9 2006
BUILDING DEP'..
MEMORANDUM
Date: Wednesday,. August 31, 2005
To: JoAnne Zu1a4 Building Department
From: Tim Yokers
Copy: File
Subject: Stevens Healthcare Grease Trap sizing
Attached is the letter dated August 16 from Bill Bennecker, the engineer who is designing the
installation of grease removal equipment for the Stevens Healthcare kitchen facility. I concur with his
proposal for two 100 gpm grease traps with ejector pumps. It is a conservative approach that appears
to be the best solution for their situation.
August 16, 2005
City of Edmonds
Wastewater Treatment Plant
200-2 nd Avenue South
Edmonds, WA 58020
Attn: Tim Yokers, pretreatment Technician
Re: Stevens Healthcare t:entral Kitchen Grease Trap Sizing Worksheet (Revised)
Dear Tim —
In past conversations with you regarding the classification of the grease retention
device, you had indicated that this project will be viewed as a grease trap system. This
conclusion was made based on the grease retention units being located inside the
building. Since we know that the device will be viewed as a grease trap and not a
grease interceptor, grease trap requirements must be met. As discussed, pians were
previously e-mailed to you for review and this letter will serve as additional
documentation for the submittal of approval from your department. Also, as discussed
yesterday, you will address the Grease Trap Sizing Worksheet since sizing will not be
based on that worksheet.
Grease Trap #
proposed to be connected to the kitchen area that has soup kettles
This grease trap is
and multiple compartments sinks. Plans indicate to remove existing disposals to
conform to City and Code requirements.
The proposed grease trap size is based on the connected pipe size, which is 4" for a
maximum flow evaluation. The existing piping is cast iron and capacity for a 4" pipe
ranges from 74 gpm to about 100 gpm (Cast Iron Soil Pipe Institute table 20). The
proposed grease trap size noted on the plans is 100 gpm and 200 pounds grease
capacity. The proposed grease trap is specified to be provided with a flow control to
restrict the inflow to a maximum of 100 gpm. This design approach was employed,
rather than determining the median flow rates of the actual operations and use of
calculated results from the Grease Trap Sizing Worksheet due to consideration that
needed to be made for frequency of product removal from the grease trap. While it
cannot be predicted exactly what that frequency according to grease trap size will be, it
is our belief that the proposed grease trap size is conservative and will aid in meeting
this consideration, field
s indicate
that considrainage
of
To further u es does not occcur simultaneously and that drainage ns usually one
that drainage of fiat
fixture at a time.
20300 Woodinville -Snohomish Road N.E., Ste. 200 •Woodinvilic, WA 98072
P.Q. Box 1200
Phone 425-483-7500 . Fax 425-483-7610
Rate: August 16, 2003 W.A. Botting Company
To: City of Edmonds Wastewater Treatment Plant Fame (425) 483-76425) 10
Project: Stevens Healthcare .
Subject: Central Kitchen Grease Trap Sizing Worksheet (Revised) Page 2
Grease Trap #2
This grease trap is proposed to be connected to the scullery area. Plans indicate
removal of the existing disposal and that the dishwasher will not be connected to the
grease trap to meet City and Code requirements.
The proposed grease trap size is based on the same parameters as Grease Trap #1 in
that it is based connected pipe size, which is 4" for a maximum flow evaluation. The
existing piping is cast iron and capacity for a 4" pipe ranges from 74 gpm to about 100
gpm (Cast Iron Soil Pipe Institute table 20). The proposed grease trap size noted on
the plans is 100 gpm and 200 pounds grease capacity. The proposed grease trap is
specified to be provided with a flow control to restrict the inflow to a maximum of 100
gpm. This design approach was employed, rather than determining the median flow
rates of the actual operations and use of calculated results from the Grease Trap Sizing
V%forksheet due to consideration- that needed to be made for frequency of product
removal from the grease trap. While it cannot be predicted exactly what that frequency
according to grease trap size will be, it is our belief that the proposed grease trap size
is conservative and will aid in meeting this consideration.
We would appreciate your prompt review and approval of this submittal and feel free to
call with any questions.
Thanks,
Bill Bennecicer,
Project engineer
WA Botting Company
20300 Woodinville -Snohomish Road X1.6_
P.O_ Box 1204
Woodinville, WA
Phone: 425483-7500 I Cell: 206-396-2588
Fax: 425-483-7610
E-mail billb wabottin.cam
RECEIVED
Grease Trap Sizing Worksheet MAY 15 2006
_��A NORTHWEST ARCHITECTURAL
FacilityName:- �v ti�5 €?Ca Ail Ce.; --t COMPANY
Address: o,j(o L) b c. , Uj Suite No.:
• A Grease Trap plumbing permit is required ($165.00 fee). Contact the Pretreatment
Technician (425-672-5755) if you have any questions and also to get signature approval on
this form.
• Dishwashers are not allowed to be connected to a Grease Trap.
• Food disposers are not allowed in a facility served by a Grease Trap and must be disabled or
removed. Solids must be screened out and placed in the solid waste container.
lr1T �c+•' l V1 1-' l�itili E�.J i�ViX1T3VL we bo a Grease +�.ilJe Ti�Q
Fix ,rrQ Capacit , in Cubic
Inches
x W x D x no. of sinks
Fixture Capacity
in Gallons
Cu. In.- 231
Drainage road
(75% of Total
Capacity)
Flow Rate for
a 2 -Minute
Drain Period
#1
x x x - c.i.
231 = al.
x.75 = gal.
- 2 Um
#2
x x x = c.i.
- 231. = gal.
x .75 = gal.
� 2 = m
#3
x x x--=-
.- 231 = gal.
x.75 = gal.
'2= m
#4
x x x = ca.
_ 231 = gal.
x.75 = al.
� 2 = gpm
Grease Trap #l. - TotaI drainage flows from maximum of 4 fixtures
gpm
#1
x x x - c.i.
- 231 = al-
x.75 gal.
-2= m
92
x x x - e.i.
-231 = al.
x.75 gal.
2 gpm
#3
x x x = c.i.
_ 231 = al.
x .75 = al.
- 2 =gpm
94
x x x - c.i.
I T 231 = al.
x .75= al.
2 = m
Grease Trap 92 -- Total drainage flows from maximum of 4 fixtures
gpm
MINIMUM SIZE 4F GREASE TRAP(S) REQUIRED
gpm
lr1T �c+•' l V1 1-' l�itili E�.J i�ViX1T3VL we bo a Grease +�.ilJe Ti�Q
1
2
J
"F
Grease Tray' Size (in gpm
20
25
35
1 50
Upsize for factors such as high volume dishwashing, high oillgrease content on menu, etc.
--------------------------- ---- -------- (For City use only below this line) ------------------------------------
Size Approved: gpm
c � T
Approved by: %Daae:
et
rreatment Technician Er)
APPLICANT
COPY J U N --9 2006
BUILDING
DEPT-
MEMORANDUM
ANDUM
Date: Wednesday,_ August 31, 2005
To: JoAnne Zulauf, Building Department
From: Time Yokers
Copy: File
Subject: Stevens Healthcare Grease Trap sizing
Attached is the letter dated August 16 from Bill Bennecker, the engineer who is designing the
installation of grease removal equipment for the Stevens Healthcare kitchen facility. 1 concur with his
proposal for two 100 gpm grease traps with ejector pumps. It is a conservative approach that appears
to be the best solution for their situation
August 16, 2005
City of Edmonds
Wastewater Treatment Plant
200 _ 2�a Avenue South
Edmonds, WA 9$020
Attn: Tim Pokers, Pretreatment Technician
Vie: Stevens Healthcare Central Kitchen Grease Trap Sizing Worksheet (Revised)
Dear Tim
with You regarding the classification of the grease retention
In past conversations
device, you had indicated that this project will be viewed as a grease trap system. This
ntion units being located inside
conclusion was made based on the grease
rete
building. Since we know that the device ill be viewed as a grease trap and notthe
a
grease interceptor, grease trap requirements must be met. As discussed, pians were
previously e-mailed to you for review and this letter will serve as additional
documentation for the submittal of approval from your department. Also, as discussed
yesterday, you will address the Grease Trap Sizing Worksheet since sizing will not be
based on that worksheet.
Grease Trap #1
This grease trap is proposed to be connected to the kitchen area that has soup kettles
and multiple compartments sinks. Plans indicate to remove existing disposals to
conform to City and Cade requirements.
The proposed grease trap size is based on the connected pipe size, which is 4" for a
maximum flow evaluation. The existing piping is cast iron and capacity for a 4" pipe
ranges from 74 gpm to about 100 gpm (Cast Iron Soil Pipe Institute table 20). The
p size noted on the plans is 900 gpm and 200 pounds grease
proposed grease tra
capacity. The proposed grease trap is specified to be provided with a flow control to
restrict the inflow to a maximum of 100 gpm. This design approach was employed,
rather than determining the median flow rates of the actual operations and use of
calculated results from the Grease Trap Sizing Worksheet due to consideration that
needed to be made for frequency of product removal from the grease trap. While it
cannot be predicted exactly what that frequency according to grease trap size will be, it
is our belief that the proposed grease trap size is conservative and will aid in meeting
this consideration. To further reinforce this consideration, field observations indicate
that drainage of fixtures does not occur simultaneously and that drainage is usually one
fixture at a time.
20300 Woodinville -Snohomish Road N.E., Ste. 200 -Woodinville, WA 98072
P.O. Box 1200
Phone 425-483-7500 a Fax 425-483-7610
2003 W.A. Botting Company
Date: august 16, Phone (425) 453-7500
To: city of Edmonds Wastewater Treatment Plant Fax (425) 483-7510
Project: Stevens Healthcare Page 2
Subject: Central Kitchen Grease Trap Sizing Worksheet (Revised)
Grease Trap #2
posed to be connected to the scullery area. Plans indicate
This grease trap is pro
removal of the existing disposal and that the dishwasher will not be connected to the
grease trap to meet City and Code requirements.
The proposed grease trap size is based on the same parameters as Grease Trap #1 in
that it is based connected pipe size, which is 4" for a maximum flow evaluation. The
existing piping is cast iron and capacity for a 4" pipe ranges from 74 gpm to about 100
gpm (Cast Iron Soil Pipe Institute table 20). The proposed grease trap size noted on
the plans is 100 gpm and 200 pounds grease capacity_ The proposed grease trap is
specified to be provided with a flow control to restrict the inflow to a maximum of 100
gpm. This design approach was employed, rather than determining the median flow
rates of the actual operations and use of calculated results from the Grease Trap Sizing
Worksheet due to consideration that needed to be made for frequency of product
removal from the grease trap. While it cannot be predicted exactly what that frequency
according to grease trap size will be, it is our belief that the proposed grease trap size
is conservative and will aid in meeting this consideration.
We would appreciate your prompt review and approval of this submittal and feel free to
call with any questions.
Thanks,
Bili Bennecker,
Project engineer
W.A. Boding Company
20300 Woodinville -Snohomish Road N.E.
P.O. Box 1200
Woodinville, WA
Phone: 425-483-75001 Cell: 206-396-2588
Fax: 425-483-7610
E-mail billb@wabottin .com