HomeMy WebLinkAboutWTR2700887 W-887 RVTI Phase II (Health Bldg. )
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(aARDNEF{ENGINEERS,INC Narnarr H 'R,m,u.PE.
CONSl1LTING ENCINEERti•SINCE 1883 Thomra P rvlammrL.P.E.
1au1a J lecxe.PE
SUITE 300.2124 FOURTH AVENUE
Seattle,Washington 88121
(206)728-1883
September 23, 1986
File: 5172-3
Mr. Ron Olson
Utilities Engineer
Department 0f Public Works
City cf Renton
200 Mill Avenue S.
Renton, WA 98055
Re: RVTI Health Building ...>.._ ''
Fire Flow
Dear Ron:
You requested clarification of our initial letter on the fire flow
analysis for the RVTI Health Building. The City's Comprehensive V:iter
Plan of 1983 examines the system with the condition that the Mt. ivet
Pump Station is out of service and the Monroe Street Pump Station is
pumping at 2000 gpm. Under thr-.e conditions, the system will provide
2250 gpm fire flow at the Healt Building from two hydrants.
We mentioned the possibility that the Monroe Street station would shut
down on low suction pressure. In further investigation this seems un-
likely. There are two Byron Uacksom pumps at Monroe Street: a 2 stage �J
14 GM with a duty point of 1500 gpm at 15')' TCH and a 3 stage 12 GM with
a duty point of 1000 gpm at 150'TDH. With a depressed suction head the
pumps move back on their performance curves to lower flaws with the 14
GM having a noticeably flat curve. The numbers from the curves (enclosed)
are:
�k
T.D.H. in feet 150' 175' 180' 185' 190' 195' 200'
Flow gpm-14 GM 1500 1080 900 800 700 600 450 ¢v
Flow gpm-12 GM 1000 850 800 780 750 _ 610 600 ->
FLOW GPM-TOTAL 2500 19 1700 1580 1450 1270 1050
The effect is that the difference between the assumed 2000 qpm and the
actual flow is available for fire flow or lessens the total demand with
corresponding lower head losses.
There are naturally system advantages to have Mt. Olivet pumping whenever `
Monroe Street is also pumping. This could be done using the start signal
for a Monroe Street pump to start a similar sized Mr. Olivet Pump. (This
would be in addition to the existing reservoir level control). ��tt
Mt. Olivet could al,o start on low system presshre sensed at either pump
station. Sensing at Mt. Olivet is simplest as no telemetry is involved;
however Monroe St. is the sensitive point in the system.
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Mr. Ron Olson, Utilities Engineers.
Department of Public Works 1
City of Renton a
September 23, 1986
Page Two
We point out, however, that this adds complexity to the system to solve
a problem wh+ch appears marginal at worst.
Very truly yours,
> '^ GARDNER ENGINEERS, INC. . ,
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Mortimer H. Thomas, P.E.
President
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600ETER STATION OATA SHEET
PUMP STATION NAME
MONROE STREET
LOCATION Renton Vocational-Technical Institute
CONSTRUCTED
NUMBER OF PUMPS z
PUMPS AND MOTOR4
PUMP NUMBER 1 2 3
MANUFACTURER fro^ Uackson Byron Jackson
j MODEL NUMBER 12 r,M a rr
FLOWRATE inns ^nm 15^( gpm f
f TYPEH 15G TOR
I V. 3 Stage V T 2 Stage
a p 3
MOTOR NUMBER 1
I� MANUFACTURER Westinghouse Westinghouse
MODEL NUMBER 365 UP d^a UP
i HORSEPOWER O 7C +
BUILDING CONSTRUCTION s
i WALLS Architectural bri k.
ROOF
HEATING orced air 4'ei ectric
VENTILATING
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I GARDULTEING ENGNE E $ING —P.n titw
WNSNFNOINFFPS•SINCE 1883 J ic ..PF..,PP6E.
SUITE 300.2124 FOIL RT:f AVENUE
Seattle.Washington nail
(206)728 1883
August 12, 1986
File: 5172-3
Mr. Ronald Olsen
Utility Engineer
City of Renton
Department of Public Works
200 Mill Avenue South
Renton, WA 98052 AUG 1 3 10-0 "r
RE: Renton Vocational Technica� Institute
Health Building Fire Flow
Dear Mr. Olsen: ''
We have examined the water system supplying the fire hydrant at the
new RVTI Health Buildina. The hydrant with the dead end 8" supply
line will supply 2250 gpm with 20 psi minimum residual pressure un-
der the following operating conditions:
Mt. Olivet Pump Station is operating.
Highlands Ground Reservoir is in service.
OR r
Mt. Olivet Pump Station is out of service,
Windsor Hills Pump Station is operating,
Highlands Ground Reservoir is in service,
Monroe St. Pump Station is not pumping.
If Monroe St. Station is pumping,
Windsor Hill Pump Station is operational ,
Mt. Olivet is out of service then two hydrants
are required to produce 2250 qpm.
It sppears likely that a large fire demand with Monroe St. pump'nq
and Mt. Olivet out of service will shut down Monroe St. with low
suction pressure. The flow would then be available to the hydrants.
Very truly yours,
GARDNER ENGINEERS, INC.
ice' . . .. .. .. .
Mortimer H. Thomas, P.E.
I President
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