Sewage Ejector System
Bulletin 232C

Data

PUMP SIZING DATA

PUMP CAPACITY
Pump capacity can be determined by the number of water closets to be handled. Other fixtures need not be considered. The capacity shown applies to single pumps and to each pump of a duplex set.

If outside drainage is greater than 1/2 the pump capacity as determined above, add the excess amount to the pump capacity.

PUMP DISCHARGE HEAD:
The discharge head for a sewage ejector installation consists of the following elements:
- Static Head: The difference in elevation between the lowest water level in the sewage basin or pit, and the maximum height of the discharge line.
- Friction:  Loss of head in the discharge line, including valves and other fittings.
- Back Pressure:  Proper allowance must be made for back pressure in sewer line, if existing.

EXAMPLE:
PROPOSED INSTALLATION: Sewage basin 5'-0" in depth to be set in ground, with top flush with finished floor. Basement floor 10'-0" below highest point of discharge line. Ejector capacity 100 g.p.m. Size of discharge line 4".

Static Head:   ---  14 ft.*
Friction Head: discharge line   ---   2 ft,
                       valves & other fittings   ---   3 ft.
Back pressure:   ---   6 ft.
Total Dynamic Head   ---   25 ft.

* Lowest water level estimated to be approximately 1 ft. above bottom of sewage basin.

DRAINAGE FROM FIXTURES AND OTHER SOURCES:
WATER CLOSET   ---   7 G.P.M.
URINAL   ---   3 G.P.M.
LAVATORY   ---   5 G.P.M.
BATH TUB   ---   6 G.P.M.
SHOWER BATH   ---   8 G.P.M.
LAUNDRY TRAY   ---   3 G.P.M.
D K G. FOUNTAIN   ---   1 G.P.M. 
WASHING MACHINE - Residential   ---   10 G.P.M. 
WASHING MACHINE - Commercial Average   ---   20 G.P.M.
WASH SINK or FOUNTAIN - Ind'l. Avge   ---   9 G.P.M. 
AUTOMATIC DISHWASHER - Residential   ---   3 G.P.M.
SERVICE SINK   ---   4 G.P.M.
RESTAURANT SINK   ---   4 G.P.M.
SLOP SINK   ---   15 G.P.M.
1/2" HOSE CONN   ---   5 G.P.M.
FLOOR DRAIN   ---   5 G.P.M.
AUTO. WASH RACK   ---   18 G.P.M.

DRAINAGE:
PAVED AREA: Normal rainfall 1" per hour on 100 sq. ft. - 1 g.p.m. 
SANDY SOIL: Normal for 100 sq. ft. - 2.0 g.p.m. (20,000 sq. ft. or less). Normal for 100 sq. ft. - 1.5g.p.m. (over 20,000 sq, ft.).
CLAY SOIL: Normal for 100 sq. ft. - 1.0 g.p.m. (20,000 sq. ft. or less). Normal for 100 sq. ft. - 0.75 g.p.m. (over 20,000 sq. ft.).

NOTE 1: Basins for Fed-Flush units can have only one inlet connection. This connection is an outside caulking hub sized to accept the specified inlet pipe size (3" thru 8").

The minimum distance from the top of the basin down to the centerline of the inlet connection is 18".

NOTE 2: The minimum distance from the bottom of the basin up to the centerline of the inlet connection is 42" 

NOTE 3: Float rod travel varies with the depth of the basin and the type of float used.

NOTE 4: The standard basin cover vent is a 3" screwed connection. If local code requires a 4" vent connection, it must be so specified when the unit is ordered.

NOTE 5: Fed-Flush units can be furnished with cast iron basins, steel basins or fiberglass basins. All basin covers are steel.

NOTE 6: Fed-Flush units can be furnished for installation in round, square or rectangular concrete pits. Steel covers and grouting frames are furnished for these pits. For square or rectangular pits, the inlet connection must be on the vertical centerline of the pit wall. A Fed-Flush inlet adaptor is furnished and must be installed when the pit is poured. Advise the inlet pipe size and pit wall thickness when ordering this adaptor.

NOTE 7: The D1 dimension (basin outside diameter) is approximately 1-1/2" larger than the D dimension (basin inside diameter).

NOTE 8: The D2 dimension (diameter of basin flange) is as follows:
          42" dia. basin, D2 = 46" 
          48" dia. basin, D2 = 53" 
          60" dia. basin, D2 = 66" 
          72" dia. basin, D2 = 78"

NOTE 9: The D (minimum) dimension shown in the table is both the diameter of a round pit or basin and the side length of a square pit.

NOTE 10: Dimensions are subject to change and should not be used for construction purposes unless certified. All dimensions are in inches unless otherwise noted.

PUMP CONTROLS
The following control arrangements are available:

FS-1 (for single unit) - one float switch for start-stop control.

FS-2 (for duplex unit) - two float switches for start-stop control. The switches can be manually set to change the lead pump. Both pumps will operate if the in-flow rate requires.

FS-3 (for duplex unit) - one alternating float switch which operates the two pumps on an alternating basis and turns on both pumps simultaneously if the in-flow rate requires.

FS-4 (for duplex unit) - one alternating float switch (as described immediately above) plus two-pole emergency auxiliary float switch which will turn on both pumps at a predetermined high water level if the alternating float switch fails to operate for some reason.

FS-5 (for single or duplex unit) - a compression tube type high water alarm actuating switch with integral alarm horn. Can also provide signal for remote alarm indication. Alarm panel with bell, indicating light and silencing button is also available.

FS-6 (for single or duplex unit) - one float switch to act as a high water alarm actuator instead of the compression tube type described immediately above.

MOTOR CONTROLS
The following control arrangements are available:

For single or duplex units: (1) magnetic starter for each motor to be mounted on an adjacent wall or on the float switch pedestal(s).

For duplex units: A Type D Duplex Control Panel in a single enclosure for mounting on an adjacent wall. These panels are available as follows:

D1000: (2) magnetic starters in one enclosure.

D1100: (2) magnetic starters and (2) unfused disconnect switches in one enclosure.

D1200: (2) magnetic starters and (2) fusible disconnect switches in one enclosure.

D1300: (2) magnetic starters and (2) circuit breakers in one enclosure.

Modifications are available for magnetic starters and Type D Duplex Panels as follows: special enclosures, 'Hand-Off-Automatic' selector switches, pilot lights, control circuit transformers, manual transfer switch and automatic pump alternator.