Sump Pump Sizing

F IL IL E N O O.. : DATE: SUPERSEDES: SUPERSEDES: DATE:

tech techni nica call dat dat a Sizing Sump & Sewage Pumping Units Type 5000

5089.11 May 15, 1991 5089.11 Jan. 5 , 1990

E N G IN E E R IN G D A T A f o r s iz in g o f The sizingofa wet pit sump orsewagepumpingunit involves thecalculation of three basicrequirements. (1) PUMP CAPACITYIN USGPM (2) TOTAL PUMPINGHEAD (3) BASINSIZE Thesedesign requirements - particularly thepump capacityare influenced by manyvariables andthe following recommendedselection proceduresinclude generous safety factorstoensure a safe, reliableandefficient installation. TABLE 1. Fixture unit ratings.

(1) CAPACITY CALCULATION Pump design capacity is thesummation of (A) fixture demand (B) water seepage throughdrain tile (C) drainage frompavedareasand (D) additional service flows. (A) FIXTURE DEMAND "Fixture unit" ratings provide the most practical method of determining basic pump capacity. •

•

•

List the number and typeof all the fixtures draininginto the sump basin. Multiply the number of eachof the fixturesby it'sweight factor fromtable1 and determinethetotal "fixture units". Refer to the appropriate curve on the demand graph and obtain the corresponding pump capacity in USGPM.

(B) WATER SEEPAGE Seepagethrough drain tilewillvary according to thenature of the soil and the following rates should be usedfor a safe estimate. i. Claysoil - 1 USGPMper 100 squarefeet. ii. Sandy soil - 2 USGPMper100 square feet.

FIXTURE OR GROUP

OCCUPANCY

WATER CLOSET

PUBLIC

TYPE OF

WEIGHT IN

SUPPLY CONTROL

FIXTURE UNITS

FLUSH VALVE

10

WATER CLOSET

PUBLIC

FLUSH TANK

PEDESTAL URINAL

PUBLIC

FLUSH VALVE

STALLORWALLURINAL

PUBLIC

FLUSHVALVE

STALLORWALLURINAL

PUBLIC

FLUSHTANK

LAVATORY

PUBLIC

FAUCET

BATHTUB

PUBLIC

FAUCET

SHOWER HEAD

PUBLIC

MIXING VALVE

SERVICESINK

OFFICE,ETC.

FAUCET

KITCHEN SINK

HOTEL, ETC.

FAUCET

WATERCLOSET

PRIVATE

FLUSHVALVE

WATER CLOSET

PRIVATE

FLUSH TANK

LAVATORY

PRIVATE

FAUCET

BATHTUB

PRIVATE

FAUCET

SHOWERHEAD

PRIVATE

MIXINGVALVE

BATHROOMGROUP

PRIVATE

FLUSHVALVE

BATHROOMGROUP

PRIVATE

FLUSHTANK

SEPARATE SHOWER

PRIVATE

MIXINGVALVE

KITCHENSINK

PRIVATE

FAUCET

LAUNDRYTRAYS(1-3)

PRIVATE

FAUCET

COMBINATIONFIXTURE

PRIVATE

FAUCET

10

ESTIMATED CURVES FOR DEMAND LOAD

(C) DRAINAGE FROM PAVED AREAS  Allow 1 USGPMper 100 squarefeet of areadrained. This correspondsapproximately to anaveragerainfall of 1"per  hour. (D) ADDITIONAL SERVICE FLOWS In some installations, thepump mayberequired to handle additional service flows suchas condenser water or boiler  drainage. All suchflows must be added tothebasicpump capacity. NOTE 1: Each pump in a duplexunit must berated for the total capacity requirement. This is a safety precaution in the event of failureof one pump. NOTE 2: When sizing sewagepumps,thecapacity should not belessthan50USGPMin a 4" line or100 USGPMina 6" line. Theseminimumcapacities will ensuresufficient velocity inthepipe lineto prevent solids fromsettling out.

(2) TOTAL HEAD CALCULATION Totalpumping headis the sumof (A) static head(B) backpressurein sewer & (C) frictionhead (A) Staticheadis the verticaldistance fromlowwater level in the sump tohighestpoint ofdischarge. (B) If thepump dischargesintoa sewer, an allowanceshould be made forthepossiblebackpressure. Approximately 2 or 3 feet will normallybe adequate. (C) To calculatefrictionhead, determinetheequivalent lengthof valves and fittingsusing valves fromtable 2 andaddthislengthto thelengthof the strait pipe in the installation. Multiplythetotal by theappropriatefrictionloss figure fromtable 3.

C O N TR O L AR R A N G EM EN TS DESCRIPTION

FLOAT

FUNCTIONAL

 TY P I C AL

DIAGRAM

OPERATION

SPECIFICATIONS

S IM P L E X FLOA T CONTROL

(1) Pump starts (2) Pump stops

Thepump shall beautomatically controlledby a float switchcomplete with castiron mountingbracket, brass floatrod, limit stops, floatrodguide and stainlesssteelfloat.

(1)No. 1 Pumpstarts (2)No. 1 Pumpstops (3)No. 2 Pumpstarts (4)No. 2 Pumpstops

TheDuplex PumpingUnit shall be automatically controlled bya float switch completewith cast iron mountingbracket, brassfloat rod,limit stops, float rod guideand stainlesssteel float.

1

2

D U P L EX FLOA T CONTROL

Leadpump canbe alternated bymanual adjustment of limitstopson floatrod.

3 1 4 2

D U P L EX M ECHA N ICA L A LTERA TION

3

1

2

D U P L EX M ECHA N ICA L A LTERA TION & E M ER G E N C Y FLOA T

3

4

1

2

D U P L EX E L EC T R I C A L A LTERA TION & EM ERGENC Y

3

FLOA T

1

2

D U P L EX FA C T O R Y W I R ED D U P L EX P A N E L & E M ER G E N C Y FLOA T

3

1

2

S.A. Armstrong Limited 23BertrandAvenue Toronto, Ontario Canada, M1L2P3 Tel: (416) 755-2291 Fax: (416) 759-9101

 Arms trong Pumps Limi ted Peartree Road, Stanway Colchester, Essex United Kingdom, C03 5JX Tel: 01206-579491 Fax: 01206-760532

(1) Working pump starts (2) Working pump stops Working and standbypumps are automatically alternatedatthe end ofeach pumping cycle. (3)Standbypump startsupin parallel with working pump. (4)Both pumpsstart upshould the mechanical alternatorfail tofunction. Leadpump canbe alternated bymanual

TheDuplex PumpingUnit shall be automatically controlled bya mechanical alternator completewithcast ironmounting bracket, brassfloat rod, limit stops, float rod guideandstainlesssteel float.

(1) Working pump starts (2) Working pump stops Working and standbypumps are automatically alternatedatthe end ofeach pumping cycle. (3A)When workingpump is operatingand level continuesto rise, standby pumpstarts upinparallel. (3B) Should electrical alternatorfail to function, both pumpsstart up.

TheDuplex PumpingUnit shall be automatically controlled bya mechanical alternator. Anemergencyfloatswitch shall alsobe providedto operate bothpumpsinthe event that themechanical alternatorfailsto function. Themechanical alternator and emergency float switch shall each be completewith cast iron mountingbracket, brassfloat rod,limit stops, float rod guideand stainlesssteel float.

(1) Working pump starts (2) Working pump stops Working and standbypumps are automatically alternatedatthe end ofeach pumping cycle. (3A)When workingpump is operatingand level continuesto rise, standby pumpstarts upinparallel. (3B) Should electrical alternatorfail to function, both pumpsstart up.

TheDuplex PumpingUnit shall be automatically controlled bya float switch and threerelaytype electrical alternator. An emergency float switch shall also be provided to operatethestandbypumponrisingwater  level or,alternativelystart both pumpsshould theelectrical alternator fail tofunction. Each floatswitchshall becomplete with cast iron mountingbracket, brass floatrodguide and stainlesssteel float.

(1) Workingpumpstarts (2) Working pumpstops Workingand standbypumpsare automatically alternatedatthe endof each pumpingcycle. (3A) When workingpump is operating and level continuestorise, standby pump starts upin parallel. (3B) Shouldalternator circuit fail to function,both pumps start up.

TheDuplex PumpingUnit shall be automatically controlled bya float switch and factorywired duplexcontrol panel withstarting equipmentandalternator circuit housedin a common enclosure. An emergency float switch shall alsobeprovidedto operatethe standby pump onrisingwater level or, alternatively start both pumps should the alternator circuit fail to function. Each floatswitch shallbecomplete withcastiron mounting bracket,brassfloat rod guideandstainlesssteel float.

 Armstr ong Pumps Inc. 93East Avenue Buffalo, NewYork U.S.A. 14120-6594 Tel: (716) 693-8813 Fax: (716) 693-8970

 Ar mstr ong Darling Inc. 2200Place Transcanadienne Montreal, Quebec Canada, H9P2X5 Tel: (514) 421-2424 Fax: (514) 421-2436 Printedin Canada