STEP Tank Sizing CalcsSTEP Tank Sizing Calculations
Project: LDS Yelm - Improvements to the Yelm Ward
Proiect No.: 406041
Date: May 6ú.2009
The sizing calculations below have been based on the following information:
o The lil'ashington State DOE Criteriafor Sewage l4¡orks Design (1998)
. City of Yelm Development Guidelines (2007)
c ll'ater Usage Records obtainedfron City of Yeln Public \4¡orks
Water Usage Information:
o Existing Church: 16,117 SFo Proposed Addition: 3,930 SFo Total: 20,047 SFo Water Usage based on two previous years (excluding irrigation months)o Peak Monthly Water Use (December2007): 580 CFo Peak Daily Flow: Conservatively Assume All Usage on 1 daylweek (Sunday)
o 5 Sundays in December 2007 + 580 + 5 : I 16 CF/Day
o 1,t6cF I DayrT'480!9!llons =t67.7 Gatlons / Day" ICF
o Projected Water Usage(Q):
867.7 Gallons = 0.0538 Gallonsf SF
16,117 SF(Exísting)
0 = 0.0538 Gallons / SF x20,047 SF (Proposed)
Q = l,}78.5Gallons
o Detention Volume Required (n : 2.0QI/: 2.0(1078.5)
V: 2,157.0 Gallons
o Use 3000 Gallon Yelm STEP Tank from Evergreen Pre-Cast, Inc.
Interior dimensions 78"w x 139"1x 77"dx 3,614 Gallons
RECIIVED
JUN 1 7 2009
o Working Volume (2" ) Provided: Voh¡me between On swirch and Offswitch
4.5" Dravvdown (Yelm Detaítr 7-14)
Yw =78"x139"x4'5"
Vw = 28.23CF x 7 .4805 Gallons I CF
Vs, =2ll.2Gallons
o Storage Volume (Zr) Provided:
DePth: 22"
Vs =78"x139"x22"
Zs = 138.03CF x7.4805GallonsfCF
Ys = 1,032.5 Gallons > 867 .7 Gallons (PeakDaþ Flow)
o Detention Volume (Zr) Provided:
Depth: 55"
Vo = 78"x139"x55"
Vo = 345.A9CF x7.4805Gallonsf CF
Vo = 2,S}l.SGallora > 2,757.ïGallons (Requíred Detentíon)
t2/3I/2øøA Ø9:28 25386329ø1 EVERGREEN PRECAST PAGE ø3/ø5
EVERGREEIV PRE,CAST I}VC,
P.Q,Box 58
Sunma,WA98390
Phonn: (253) 863-6510
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PF Series High-Head fffluent Pumps
Applications
0ur submersible High-Head Effluent Pumps are designed to
transport screened effluent {with low TSS counts}from septic
tanks or separate dosing tanks. All our pumps are constructed
of lightweight, corrosion-resistant stainless steel and engi-
neered plastics; all are field-serviceable and repairable with
common tools; and all standard 60-Hz PF Series models are
CSA certified to the U.S. and Canadian safety standards for
effluent pumps, meeting UL requirements.
High-Head Effluent Pumps from 0renco@ are used in a variety
of applications, including pressurized drainfields, packed bed
filters, mounds, aerobic units, effluent irrigation, effluent sew-
ers, wetlands, lagoons, and more. These pumps are designed
to be used with a Biotubeo pump vault.
Discharge
connection
- Bypass
orifice
Suction
connection
Features/Specificati ons
To specify this pump for your installation, require the following:
. Minimum 24-hour run-dry capability with no deter¡oration in
pump life or performance*
. l/8-inch (3-mm) bypass orifice (patent pendinglto ensure
flow recirculation for motor cooling and to prevent air bind
. Liquid end repair kits available for better long-term cost of
ownership
. TRI-SEALTM floating impeller design on l0-, 20-, and 30-gpm
models; floating stack design on 50- and 75-gpm models
. Super stainless Franklin Electric motor, rated for continuous
use and frequent cycling
. Type S00W600-V motor cable (suitablelor Class l, Division
1 and Division 2 applications)
. Five-year warranty from date of manufacture against
defects in materials or workmanship
* Not applicable for í-hp models
Standard Models
See specifications chaft, pages 2-3, for a list of standard pumps.
For a complete list of available pumps, call 0renco.
Nomenclature
! !-![
T T T.*o n"r,n,I I Blank= l0'I I 20* =2o'I I 30 =30'I I so =50'I I uo,,ur" (nameplate):I I = ll5 (l/2 hp only)I 200 = 200I z = 230 (z2o if 5o Hz)I 4 =460| ,r.ou"n"r,I = single-phase 60 Hz3 = three-phase 60 Hz5 = single-phase 50 Hz
Horsepower:05 = ll2hp07 = 3l4hp10 = thp15 = l-U2hp20 = 2hp30 = 3hp50 = 5hp
"@î"LBE0SAO
LR2053AS6
Nominal florv (gpm):
t0
20
30
50
75
Pump (PF Series)
* Note: 2Ù-loot cords are available only for single-phase pumps through ì't7 hp
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Page I ol 6
PF Series High-Head Effluent Pumps (continued)
PF100511 l0(0.6) 0.5 (0.37) 1 115 120 12.7 t2'7 6 1 l/4 in. GFP 23'0 (660) 16 (406) 26 112) 300
PF100512 l0 (0.ô) 0.5 {0.37) I 230 240 6.3 6'3 6 1 1/4 in. GFP 23'0 (660} 16 (406) 26 (12) 300
PF10053200 l0 (0.ô) 0.5 (0.3?) 3 200 20s 3's 3.8 6 1 1/4 in' GFP 23.0 (660) 16 (406) 26 (12) 300
pflOOztz¡,s rO{O.O} O.ZS(O.SO} t zgO Z¿O 8.3 8.3 I 1 1/4in.GFP 25.9(658} 17(4{12) 30(14} 300
pflOOZgZOOa,s lO (O.O) O.ZS (O.So) g 200 208 5.1 5.2 8 1 1/4 ín. GFP 25.4 (6451 17 (€2) 31 {14} 300
pflOtOtz+s lO(0.6) 1 (0.i5) t 230 240 9.6 9.6 I 1 1/4in.GFP 27.9(709) l8(457) 33115) 100
prrOrOgZOO¿,s rO (O.O) r (O.tSl g 200 208 b.S 5.5 I 1 1/4 in. GFP 27.3 (093) 18 (457) 37 (17) 300
pftOZOtZo,¿o lo(0.61 2(1.491 1 230 240 12.1 12.1 18 1 1/4in.SS 39.5(1003) 22(5591 48(22) 100
prtozOgzOoo.s to {0.6) 2 (1.49) 3 200 208 8.7 8.i t8 1 1/4 in. SS 3i.9 {963) 20 (508} 44 (20} 300
PF200511 20 11.5) 0.5 (0.371 1 115 120 12.3 12.5 4 1 1/4 in. GFP 22'3 {566) 18 (457) 25 (11} 300 *'przoOSlz zO {t.s} o.s (0.s7} t 230 240 6.4 6.5 4 I 1/4 in. GFP 22.5 (572} 18 {45i) 26 {12) 300
PF20053200 20 (1.51 0.5 (0.3i1 3 200 208 3.7 3.8 4 t 1/4 in. GFP 22'3 (566) 18 (457) 26 {12) 300
przolotzrs zo (l.s) t (0.25) 1 230 240 10.5 10.5 7 1 1/4 in. GFP 28.4 (721) 20 (508) 33 (15) 100
przoloszoo{,s zo (t.S} I lo.zs) s 200 20s 5.8 5.9 7 1 U4 in. GFP 2i.8 (706) 20 (508) 33 {15) 300
pfZOtStZ+s ZO (t.S) l.S (t.tt) t 230 zqo 12.4 12.6 I 1 U4 in. GFP 34.0 (8641 24 (610) 41 (19) 100
przotsszoo+s zo(t,5) 1.511.11) 3 200 208 7.i 7.2 9 1 1/4in. GFP 30.7(7801 20(508) 35(16) 300
PF300EI 30(1.9) 0.5{0.3i} 1 115 120 11.8 11.8 3 l1/4in.GFP 213(5al) 20(508} 28(13} 300
i 230 240 6.2 6,2 3 1 1/4 in. GFP 21.3
prsoozlz ¡o (l.gl 0.75 (0.56) 1 230 240 s.5 8.5 5 1 1/4 in. GFP 24.8 (630) 21 (5331 29 (13) 300
prgOozgzoo so (l.s) 0.75 (0.56) 3 zoo 208 4.9 4.9 5 1 U4 in. GFP 24.6 (625) 21 (5331 30 {14) 300prsotolz¿ so (t.sl t (0.i5) 1 230 240 10.4 10.4 6 1 U4 in. GFP 27.0 {6s6) 22 {559) 32 (15) 100
prgOlogzoor go(t.g) t (0.75) 3 200 208 5.8 5.8 6 i l/4in.GFP 26.4(671) 22{559) 33(15) 300
pF30.1b1245 30 (1,9) 1.5 (1.¡) I 230 240 12.6 12.6 8 l 1/4 in. GFP 32.8 (8$) 2a (610) 40 (18) 100
pfgOZO¡zOO+s ¡O {l.gl 2 (1.49) 3 200 208 9.3 9.3 l0 1 1/4 in. SS 34.0 {864) 24 (610) 4l (19) 300
pF3030126'i's 30(1.9) 3(2.231 1 230 240 16.8 16.8 14 1 1/4in.SS 44.5(1130) 33(838) 54(241 100
preôsogzo,s so(l.g) s(z.zsl ¡ zso z¿o ro ro.r r¿ t t/+in.ss 44.s(ttzs) zz(ggs) sz(z+) ¡oo
pr¡osOtzo¿s gO (t.g) s (9.23) 1 230 240 25.6 25.8 23 t 1/4 in. SS 66.5 (1689) 53 (1346) 82 {37) 100
prsososzo's so(l.g) 5(3.i31 3 2¡0 240 16.ô 16.6 23 1 U4in.SS 60.8(1544) 48(12191 66(30) 300
pFsooslr b0(3.2) 0.510.371 I 115 120 12.1 l2.l 2 2in,SS 20.3(516) 24(610) 27{12) 300
PF500512 50 (3.2) 0.5 (0.37) t 230 240 6.2 6'2 2 2 in. SS 20.3 (516) 24 (610) 2i (12) 300
prsoos¡zoo so (¡.2) 0.5 (0.371 3 200 208 3.7 3.7 2 2 in. SS 20.3 (516) 24 (610) 28 (13) 300
PFs00712 50(3.2) 0.75{0.s6} 1 230 240 8.5 8.s 3 2in.SS 23.i(602) 25{635) 31 (14} 300
Þrsoorszoo so (g.z) o.zs (0.¡o) s zoo zog ¿.g ¿.g s z ¡n. ss zg.t (ssz) z0 (000) sz (ts) goo
prsOoze¿ so (s.z) 0.75 {0.56) 3 460 480 1.8 l.s 3 2 in. SS 34,8 (884} 25 (635} 31 {14) 300prsOtotz so(s.z) I {0.75) 1 230 240 10.1 10.1 4 2in.SS 27.0(686) 26{660} 35{16) 100
pr¡otoszoo so(¡.2) I (o.rs) ¡ zoo zos s.l s.l q z¡n.SS 20.¿(ezt) ze{o0o} ¡s(ta) sooprsOtstz¿ So(s.z) t.S(l.tt) I zso 240 12.5 12.6 5 2in,SS 32.5(826) 30(762) 41(191 100
prsorsszoor So (g.z) l.s (t.il) g zoo zog z r s z ¡n. SS zs.s (244) 26 {660} 35 (16) 300
pfSO¡OtZ¿.s,¿e SO (g.Z) g {2.23) 1 230 240 17.7 17.7 8 2 in. SS 4íl ('1092) 37 (940} 55 (25) 100
prSO¡OgZ+s,¿ SO (g.Z) g (z.zg) g zgO zqO 10.4 10.4 8 2 In SS 40 (1016) 30 {762} 46 (21) 300
pfSOgOeZOO4,s,¡ SO {g.Z} e {z.zs) 3 200 208 13.1 13.1 I 2 in. SS 4iì.4 (1102} 30 (i62) 55 (25} 300
pfSOSOeZo,s SO (g.Zl S (9.73) 3 230 240 16.5 16.5 13 2 in, SS 59.3 (1506) 49 {1245) 64 (29) 300
pnststz zs (¿.2) t.s (t.tl) I z¡o z¿o tz.l lz.g + z ¡n. SS ¡¡.¿ (84s) ¡o (r0zl 44 (zo) too
See notes on following page.
f{TD.PU-Pt-r
Rav.1.6, @ 7Æ8
Page 2 ol 6
@ 20$ 0renco Sylemso lnc,
PF Series High-Head Effluent Pumps (continued)
g s ã Ë-3 Ë ËË È ? * g'Ë
ãE ãs Ê Ë Ë ã ¡ E ËËc¡= -= o- z
10(0.6) 0.5(0.3i) 1 220 230 3.9 4.1 I 1/4 in. GFp 23 {ss4) 1.1 l4szl 26 (12)
10{0.6) 0.i5(0.56} 1 n0 n0 6.2 I 1 1/4 in. GFP 26.8 {658} 17 14321 30 {r4}
30 (1.91 0.s (0.3i) 1 n0 230 4.1 1 1/4 in. GFP 22.5 1572l. 19 (4831 2611214,1
PF300752 30{1.9} 0.75(0.56} 1 220 230 6.1 6.1 1 1/4 in. GFp 24.s (630) t9 14831 29 fls)
PF301052 30 (1.9) 1 {0.75) 1 n0 230 7.4 7.4 7 I 1/4 in. GFP 28.417211 20 1508)32 (1s)
PF301 552d s 30{i.9} 1.51r.11} 1 U0 230 9,3 I I 1/4 in. GFP 35.4 (899) 24 (610) 40 (181
50 (3.2) 0.s (0.3i1 1 n0 230 2 in. SS 20.3 (sr6l 25 (63s)29 (13)
50 (3.2) 0.75 {0.56) 1 220 230 6.4 3 2 in. SS 23.7 (602) 2s (635) 3l l14l
50 {3,2) 1 (0.i5} 1 n0 æ0 7.3 7.4 4 2 in. SS 2i (686) 26 (660)35 (16)
50(3.2) 1.5(1.11) 1 220 230 9.1 2 in. SS 32.5 (826) 30 (762) 42 (19)
t Stp = glass-filled polypropylene; SS = stainless steel. The I 1/4-in. NPT GFP discharge is 2 7/8 ín. octagonal across flats;the I 1/4'in. NPT SS discharge
ís 2 1/8 in. octagonal across flats; and the 2-in. NPT SS discharge is 2 7/8 in. hexagonal across flats. Discharge is female NPT threaded, U.S. nominal
size, to accommodate 0renco@ discharge hose and valve assemblies. Consult your 0renco 0istributor about fittíngs to connect hose and valve assem'
blies to metric-sized piping.
2 Minimum liquid level is for single pumps when installed in an 0renco Biotube@ Pump Vauh or Universal Flow lnducer. ln other applicatíons, minimum
liquid level should be top of pump. Consult Orenco for more information.
3 Weight includes canon and 1()-ft cord.
a High-pressure díscharge assembly required.
s Do not use cam-lock option {0} on discharge assembly.
6 Custom discharge assembly required for these pumps. Contact 0renco.
7 Capacitor pack included with pump. Custom control panel required.
I Torque locks are available for all pumps, and are supplied with 3-hp and 5-hp pumps.
Materials of Gonstruction
9,1
Discharqe: Glass'filled polvpropylene or stainless steel
Discharqe bearing: Engineered thermoplastic (PEEK)
Glass-filled PP0 (Norvl GFN3I
lmoellers: Celcono acetal copolvmer on l0-,20, and 30-gpm models; 50-gpm impellers are Noryl GFN3
lntake screen:Polvpropvlene
Suction connection:Stainless steel
Drive shaft:7/16 inch hexaqonal stainless steel,300 series
Sintered stainless steel, 300 series
Shell:Stainless steel, 300 series
Franklin motor e)derior constructed of stainless steel. Motor filled whh deionized water and
propylene glycol for constant lubrication. Hermetically sealed motor housing ensures moisture'free
windings. All thrust absorbed by Kingsbury-type thrust bearing. Rated for continuous duty.
Protected againstthermal overload and equipped with surge arrestors for added security.
@ 2fX)8 0rsnco Systsmso lnc.t{T0.Pu-PF-t
Rev.1.6, @ 7il8
Page 3 of 6
PF Series High-Head Effluent Pumps (continued)
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Using a Pump Gurue
A pump cr.rrue helps you determine the best pump for your system. Pump curves show the relationship between flow (gpm or
Usec) and pressure (total dynamic head, orTDH), providing a graphical representation of a pump's optimal performance range.
Pumps perform best at lheir noninal flow rate- the value, measured in gpm (or Vsec), expressed bythe firsttwo numerals in an
0renco pump n0menclature. At low flow rates, TDH varies from pump to pump, so it is represented as a dashed line in the pump
curves. For most accurate pump specification, use 0renco's PumpSelect" software.
10 l5 20 25 30
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@ 20æ 0renco Systemso lnc.
PF Series High-Head Effluent Pumps (continued)
60 Hz Models (continued)
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PF Series High-Head Effluent Pumps (continued)
50 Hz Models
Gallons per minute (GPM)
369
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Liters per second (Usec)
Gallons per ninute (GPM)
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@ 2008 0renco Systomso lnc.NTD-PU.PF.1
Rev. 1.6, @ 7Æ8
Page 6 ol 6
Sewers December 1998 Cl-29
A vessel (tank) over 1,500 gallons in size shall be confrgured to allow
solids to deposit in the tank. It is recommended that the tanks conform to
the following approximate configurations:
. An approximate tank size of 3,000 gallons shall have an
equivalent diameter of 6 feet.
. An approximate tank size of 6,000 gallons shall have an
equivalent diameter of 8 feet. It is recommended that tank volume
over 6,000 gallons be accomplished with tanks in series to
facilitate tank pumping. If tanks are placed in series, a baffle wall
will not be required.
Tanks shall have a baffle wall inst¿lled that represents two-thirds volume
in the first chamber and one-third volume in the second chamber. It is
recommended that the baffle wall shall be constructed as outlined above.
Tanks that are over 2,500 gallons tot¿l volume shall have three access
ports with a minimum diameter of 18 inches, two in the frrst chamber and
one in the second chamber.
All ønks will include an inlet tee. The bottom of the tee will be extended
to l8 inches below the liquid level,
A STEP/SDG t¿nk shall contain detention volume, working volume, and
storage volume.
B. Detention Volume STEP/SDG
The detention volume or liquid volume of a STEP or SDG tank that serves
a single-family home or small business shall be a minimum of 950 gallons.
Detention volume is defined as the volume of liquid below the "OFF"
switch (STEP) or the outlet pipe (SDG). Tanks that serve structures with
higher wastewater discharge volumes shall be sized in accordance with the
following equation:
V: l.5Q (residential strength waste)
V = 2.0Q (nonresidential strength waste)
Where:
V: Liquid volume
Q = Peak day flow for the structure being served
The equation provides the minimum liquid volume within the STEP/SDG
tank. The tank shall also contain suffrcient working volume and storage
volume. Liquid volume shall be approximately 65 to 75 percent of the total
tank volume.
C. Working Volume STEP/GP
The working volume shall be greater than the difference between the peak
influent flow and the discharge of the STEP or grinder pump over a period
of time estimated to be the peak duration. Working volume is defined as
the volume between the "ON" and the "OFF" switch.
Storage Volume
STEP, SDG, and GP vessels (ønks) shall have a minimum of 24 hours of
storage within the t¿nk except as allowed (see C l-10.1.6E.2). Tanks
without 24 hours of storage shall be installed with a power transfer switch
with an emergency generator plug or other device for allowing emergency
power connection, or shall have reserye volume provided with a separate
vessel. Storage volume is defined as the volume between the "OFF" switch
and the top of the tank.
Power Outages
l. Applicability
STEP, SDG, and GP systems inst¿lled in areas with a history of
prolonged power outages may require additional storage volumes. The
designer shall review historical records of the local power puweyor to
determine the advisability of adding more storage.
2. Power Transfer Switch/EG Plug
Vessels without 24 hours of storage shall be provided a power transfer
switch with an emergency generator plug. The number of tanks
installed with power transfer switches shall be limited to the number of
tanks or vessels that can be serviced by the local agency during a
power outage. The agency shall also keep power generators with the
proper connection to the generator plug on hand and in good working
order.
C1-10.2 System Components
C1-10.2.1 Pipeline
Generally, pipeline material shall be constructed of material that is not readily
subject to corrosion by raw or septic wastewater.
Service Line/Check Valves
Each service line between the SDG vessel, STEP, or GP pump and the
collection line shall have a gate or ball valve insølled at the main. In
addition, a minimum of two check valves will be in'stalled on the STEP
and GP service lines, and a minimum of one check valve will be inst¿lled
on the SDG service line. The check valve attached to either the STEP or
GP pump counts as one of the check valves.
Service lines shall be a minimum of I inch in diameter.
Cleanouts/Pig Ports
Cleanouts þig ports) shall be inst¿lled at the ends of all pipelines.
Cleanouts will be designed to launch a2lb/cu/ft polyfoam pig for scouring
the pipelines. A cleanout can accept a pig that is 2 inches larger in
diameter than the pipe that it is being inserted (for example, a 4-inch pig
can be launched into a 2-inch pipeline). An additional pig port will be
installed when the pipeline diameter exceeds the size of pig that can be
launched in a cleanout (such as the transition between a 4- and 6-inch-
diameter pipeline).
D.
E.
A.
B.
cr-28 December 1998 Criteriaþr Sevage lI/orks Design
may opt to include design zones within the system with different maximum
hydraulic gradelines.
The pump selected shall also be able to discharge influent peak flow (volume)
without exceeding the working volume within the pump holding vessel (see
C l - l 0. I .6). Influent peak flow (volume) will be determined by reviewing the
number of frxtures within a structure or by applying a peaking factor to
average daily volumes. The designer shall use a minimum of 400 percent of
average daily flow for estimating peak influent volumes.
C1-10.1.6 Tank/Vessel Type and Sizing
Any vessel used for construction of a STEP, SDG, or GP system shall conform
to general guidelines, as follows:
. Vessels shall be constructed of a material that does not degtade from
corrosion caused by the surounding soil or the wastewater being held
in the vessel. Common materials include reinforced cement concrete,
reinforced fiberglass, and polyethylene,
. Vessels shall be designed to withstand the external soil loading based
upon the type of soil, lateral loading due to hydrostatic water pressure,
and wheel loading. Vessels to be located in a traffic-bearing area shall
be designed to withst¿nd HS-20 truck loading with appropriate impact
factors.
. All vessel designs will bear the stamp of an engineer licensed in the
State of Washington with specific expertise in design of similar
vessels certifying that the tanks will meet the loading conditions
specified herein.
. The vessel, appurtenances (risers, lids, cleanouts, inspection ports,
inlet and outlet piping, etc.), and the connection between the vessel
and appurtenances shall be watertight. Each vessel and appurtenances
once fully assembled and installed shall be tested for leakage by filling
with water or low-pressure air. The test will be witnessed by the
agency operating the system or their duly authorized representatives.
No vessel will be accepted if there is any noticeable leakage during the
testing period.
A. Tank Configuration STEP/SDG
A vessel (tank) up to 1,500 gallons in size shall be configured in
accordance with the intent of the International Association of Plumbing
and Mechanical Officials (IAPMO) SPS l-87 with the following
recommendations:
. A baffle wall or compartment wall is recommended but not
required for 1,000- and 1,5OO-gallon tanks.
. The baffle wall will be constructed with a hole or knockout at the
top of the baffle wall for ventilation and multiple holes or
knockouts located in the clear zone of the tank (approximately
70 percent of the liquid level of the tank). The holes or knockouts
shall be of sufficient size to prevent plugging from raw sewage.