Jay R. Smith 8750, 8760 Installation Manual
INTERCEPTORS
TECHNICAL DATA
SCIENTIFICALLY ENGINEERED
D
N
A
D
R
G
N
I
B
M
U
L
P
B
M
E
M
I
N
S
T
I
has conducted hundreds of tests both in the laboratory and in
A
I
N
A
G
E
the field, in order to offer efficient grease interceptors which
R
E
have improved operational characteristics suitable for most
®
E
T
U
T
applications.
When designing our line of interceptors, we kept in mind the fact that these units
must be for practical applications. As a result, the units embody practical features that make installation easier and also simplify cleaning and servicing.
PLUMBING AND DRAINAGE INSTITUTE CERTIFICATION SEAL
Interceptors bear the certification seal of the Plumbing and Drainage Institute.
Ratings shown in the catalog conform with the rigid standards established by the
Institute. This seal on Smith Grease Interceptors is your guarantee that the designs
and ratings have met or surpassed all standards established by the Institute.
PRACTICAL FEATURES The one piece cover used on SMITH Interceptors is
equipped with a single lock and lift ring (two on large sizes). No bolts or nuts to
get lost or wrenches to look for . . . the locking device is a practical feature of the
cover assembly.
A soft, flat neoprene gasket is firmly attached to the body of all interceptors.
This eliminates the gasket tearing loose every time the cover is removed.
Interceptors have an air relief to eliminate the possibility of siphonage, and are
furnished with a separate flow control device to insure the interceptor will function within its rated capacity.
For over fifty years, JAY R. SMITH MFG. CO.
Many Smith
SMITH
CUSTOMER
DRIVEN
®
APPLICATION A Grease Interceptor is necessary where grease, fats, oils or
other similar line clogging contaminants are present in waste water that must be
disposed of through the sanitary system.
Preventing grease from entering drainage lines should always be considered when designing the plumbing drainage system in any restaurant, cafeteria, hotel, school, hospital, institutional or commercial building having facilities for the preparation and serving of food in quantity. In these installations, as well as in commercial food processing plants, dairies, and other
industries where greases and fats are a by-product, an efficient SMITH
interceptor should be installed to prevent this material from entering the
drainage lines.
HOW THE INTERCEPTOR OPERATES
Water draining to the interceptor passes through a flow control fitting which
regulates the velocity of the water to the capacity of the interceptor. As the
water enters the interceptor at this controlled rate of flow it is free of turbulence. It then passes over a series of separator baffles which are strategically
located to insure that greases, fats and oils are efficiently separated from the
waste water. Once separated, these contaminants rise to the surface of the
water in the interceptor by natural flotation and are accumulated until
removed. The waste water now relieved of over 90% of the contaminant oils
and greases, continues to flow through the interceptor into the sanitary system.
TYPICAL SINGLE FIXTURE INSTALLATIONS
▲Air Intake
Flow Control
FIXTURE NOT TRAPPED
▲See Footnote Pg. 8-02.
FIXTURE TRAPPED AND VENTED SEPARATELY
PROCEDURE FOR SIZING GREASE INTERCEPTORS
EXAMPLE
STEP 1 Determine the cubic content of the fixture by multiplying length x
width x depth.
STEP 2 Determine the capacity in gallons.
1 gal. = 231 cubic inches.
STEP 3 Determine actual drainage load.
The fixture is usually filled to about 75% of capacity with waste
water. The items being washed displace about 25% of the fixture
content. Actual drainage load = 75% of fixture capacity.
STEP 4 Determine the flow rate and the drainage period. In general,
good practices dictate a one minute drainage period, however
where conditions permit, a 2 minute period is acceptable.
Drainage period is the actual time required to completely empty
the fixture.
Flow Rate =
Actual Drainage Load
Drainage Period
STEP 5 Select the Interceptor which corresponds to the flow rate calcu-
lated. Note – Select larger size when flow rate falls between two
sizes listed. If flow rate is above 50 GPM, select a larger
Interceptor from page 8-07, Fig. 8400 Series.
As a general rule, it is good practice to size the Interceptor so that its rated capacity is never less than 40% of the fixture capacity in gallons. In the example
above, the actual fixture capacity is 59.8 gals., and 40% of this would be 23.9 gals. or a Fig. 8025. It is readily seen that a drainage period other than one or
two minutes can be used. If conditions justify, any period between one and two minutes is satisfactory, however, we do not recommend a period longer than
2 minutes. Using the 40% rule of thumb gives a drainage period of 1 7/8 minutes.
A sink 48" long by 24" wide by 12" deep
Cubic content 48 x 24 x 12 = 13,824 cubic in.
Contents in gals. 13,824
231
= 59.8 gals.
Actual Drainage Load .75 x 59.8 gals. = 44.9 gals.
Calculate flow rate for 1 minute period.
Flow Rate 44.9 gals.
1 Min.
For 2 minute period
Flow Rate 44.9 gals.
2 Min.
For 1 minute period
44.9 GPM requires a Fig. 8050
For 2 minute period
22.5 GPM requires a Fig. 8025
▲Air Intake
Flow Control
= 44.9 GPM
= 22.5 GPM
AUTOMATIC DRAW-OFF GREASE INTERCEPTORS
Smith "GT" Series Automatic Draw-off Grease Interceptors offer the same high intercepting efficiency as the conventional manual cleaned models, but
completely eliminate the unsanitary and undesirable job of removing the accumulated grease manually.
The automatic draw-off interceptor eliminates . . . • time consuming cover removal
manually removing accumulated grease
•
offensive odors
•
Since cleaning a "GT" interceptor is simple, fast and efficient, maintenance personnel will more likely follow the regular cleaning schedule. This is a distinct
advantage over the conventional units which are frequently left unattended.
When to Clean - The ideal time to clean is immediately after the interceptor has been heavily used.
Cleaning Frequency - The frequency of the draw-off cycle is determined by the use
load factor of the interceptor. An ideal cleaning cycle can be set after the unit is in operation for several weeks. By observing the amount of grease used and the frequency of
use, the operator can determine a logical cleaning cycle.
Cleaning Operation 8000 GT Series
1. Unit in normal use has the line control valve open and automatic draw-off valve
closed. When cleaning is required, run a full stream of hot water through interceptor. It is preferable to have this water at 140° or higher, running for a period of at
least two minutes.
2. Turn off hot water running into the interceptor and wait for a period of three to five
minutes for grease in the interceptor to liquefy.
3. Automatic draw-off cycle can now be started. Close the line control valve.
4. Open automatic draw-off valve at top of the interceptor and place a container
underneath this valve. Run hot water through interceptor at a rate of between 1 1/2
and 2 1/2 G.P.M.
5. After water has run into interceptor at this rate for a short period, the unit will fill.
Accumulated liquefied grease will be raised into cone and draw-off piping.
6. Allow accumulated liquefied grease to flow out of draw-off valve until clear water
appears.
7. When clear water appears, shut off flow of hot water into interceptor, turn line control valve to open position. Close automatic draw-off valve at top of interceptor.
8. Interceptor at this stage is ready again for normal use.
Grease Accumulating
Cone (Inside)
Removable
Baffles (Inside)
Lift Handle
Fig. 8000GT
Automatic
Draw-Off Valve
Cleanout
Line Control Valve
SMITH
CUSTOMER
DRIVEN
®
INSTALLATION - GREASE INTERCEPTORS
MULTIPLE FIXTURE INSTALLATIONS
It is sometimes practical to discharge the waste from two or more sinks into a
single Interceptor. This practice is only recommended when all fixtures are
close together, avoiding installation of long piping runs to the Interceptor. For
multiple installations, size as follows:
1. Determine total capacity of all sinks.
2. Establish the maximum simultaneous discharge of the sinks and fixtures.
3. Using the maximum simultaneous load capacity, determine the
SINGLE INSTALLATION - FULLY RECESSED
Interceptor required using the sizing method shown on page 8-01.
Vented
▲Air Intake
Flow Control
Fig.
8000
ON FLOOR INSTALLATION
▲Terminate Air Intake outside above the rim of sink with return bend or con-
nect to vent or vent stack as required by local code.
Waste
Interceptor Independently
Supported On Hangers
RECESSED WITH EXTENSION TO FLOOR LEVEL
Interceptor cover may be brought to floor level by using an extension when
Interceptor installation is below the floor.
GREASE INTERCEPTORS WITH EXTENSION
INSTALLATION NOTE
The Extension of 8200 Series Interceptors is designed to increase the roughing dimension from the Inlet-Outlet center line to the finished floor. The Extension
should not be used to support the entire unit. When installed in ground floor locations, the Interceptor body must rest on solid ground or on a suitable concrete pad. If
the 8200 Series unit is installed in an upper floor (suspended in the ceiling below), a suitable method of supporting the entire unit must be provided. The installation
sketch shows a typical Interceptor with Extension and a recommended method of supporting the entire weight.
SUSPENDED INTERCEPTOR INSTALLATION CONSIDERATIONS
Whenever an interceptor is to be installed suspended with receiving cradle (8300 series) or independently (all other series interceptors), proper support is essential for safety and functional integrity of the installation.
Trapeze type hangers such as those employed for support of multiple runs of horizontal piping are recommended for support of independent interceptors. Such
supports should also be considered for 8300 series receiving cradles to supplement the integral concrete anchor flange.
Supports must be of sufficient strength for the purpose intended and meet with the approval of the architect or engineer.
▲Air Intake
Flow Control
Air Intake
▲
Flow Control
Fig.
8000
Fig.
8200
Steel
Extension
Vented
Waste
Vented Waste
Loading...