05-0458 Parametrix Pump Skid Review 070708~~~SX~^I~~RF$~Qx , ~*Aa~0~9Ff RkAta
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I'NI~4. No. 247-I7~I-Q24 ~Q~lQl j
l~r. Steve l=lai°nngton
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1Q5 Yelnz ~venzze ~Pcst
'Yeli~n, W.A. 98~~7
IZe. I~az-rester I-Iei~hts 41Vater ~aastez- I~un~p Station, I?~.zza~p Skid Suhn~ittai I'seview
Dear 1~Ir- I-Iaz~riz~~tan.
e have caznpleted i-evie~v of the hump Skid Subiauttal far thU harrester I~ei~hts II~oostez° hump Station received in our
ofhce ~izne 25, ?OQ~ ~enclased far reference). The submittal includes pizznp curve infonziatian, system specihcatiazis, a
pazael wiring diagraaxt, aiad dia~plrra~ i tank infoz~anatian. ~~e have the fallowing comments based azz our review:
1. The pump skid design does not include the check valve between the disclzargc and suction sides of the pzzmp
skid as rc;caininended by the Water I~aminer Analysis. If the designer's intent is to L~rovide this check valve
separately from the skid, a revised mechanical plan sheet slaozzld ~3~ pz°avided slzav ink installation of tine check
valve.
~?. The control function. and control specifications provided address only the tlit-ee larger pumps ~vitlz variable
lz°e~zaea~c~~ drives (~jFL~s} renzately anounted iza the c~~~~tz°ol panel. Control of the smaller jockey pusnl~ with the
integral ~fhD is not addressed. Detailed central logic slioazld be provided spc;cifac to the pump skid/VFD
configuration proposed for this project. ~laz-alicatiau should. be provided on how the system will transition
between the jockey pump axed the larger pumps, aa~d haw the system would operate if a ~I'D were to fail.
~. The panel-wiz-ing diagram provided does z~at match the pz°ahased pzaza~la skid configuration or the eont~-al logic
disci-ibed elsewha~re iza the suhrrzittal_ `I'he cliagrain depicts a ~twa-pumg~ system with across-the-Iizae star-ting. A
diagram. should be pi°avided specific to floc pump skid/~?F'D canli~ zratian proposed for this project. The
diagram slioazld clearly indicate which options will be provided far this specific installation.
d. Tlie most recent design report submitted for ttie poz-z-ester weights k~aaster Station indicates a I ~2-gallaiz
ASI1~E-certified diaphragm tank., and the eater Iiannner ~~nalysis recomzi~ended a `~-inch-diametei° cazniectian
to the diapYzragzn tank. The subixaittal package indicates a iiaia-taS1'dl1 certified tank with a I-I!~l-inch-diameter
connection. An AS~~E-certified tank with a 2-inch-diameter canziection slaoazld be provided.
Thank you far the opportunity to review this project for you. If we cai~z be of further assistance, please let its kilaw.
~ei°y tz-uly yours,
h hTI~I
.s
tea ety~t~aznand, ~`.~, o.. i ~ jj
Senzar ~'ninecr, Miazaicipal Sez-vices group
ICI' :le
pnclosizz-e
cc: hrcaject pile