Armstrong 4600 HSC series Installations- und Betriebsanleitung - Seite 6

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1.4. alignment

The flexible coupling compensates for temperature changes

and permits shafts end movement without interference; it will

not compensate for misalignment. Faulty alignment will result in

noisy pump operation, reduced bearing life, and excessive

coupling wear.

• Carefully verify the alignment after the foundation bolts

have been properly tightened

• Alignment should be again verified after piping is installed

and unit has operated under normal conditions at operat-

ing temperature

• To verify alignment, place a straight edge across the cou-

pling as shown; this must rest evenly on both rims at top,

bottom and both sides

• With a pair of inside calipers or thickness gauge, check

distance between coupling halves at points where straight

edge was used; distance must be equal at all points

1.5. minimum fittings

If minimum fittings recommended by n.f.p.a. 20 are supplied

loose, they should be installed as follows:

testing alignment

angular

misalignment

feeler taper

perfect

alignment

Horizontal split case

fire pumps

straight gauge

feeler gauge

circulation relief valve (not supplied with diesel driven

pumps)

• Install Circulation Relief Valve at the casing discharge (al-

ways before the check valve)

• Set pressure at the minimum suction pressure plus the pump

rated pressure raised to the next higher 5 lb. increment

• Circulation relief valve and stuffing box should then be piped

to drain

automatic air release valve

• Install automatic air release valve on top of pump casing

to vent casing and suction piping of air and vapor before

start-up.

suction and discharge gauges

• The following gauges are required to measure both suction

and discharge pressures, and must be supplied with all fire

pumps to ensure close check on pump performance:

a 3½" dial combination pressure and vacuum suction gauge

b 3½" dial discharge pressure gauge

c ¼" cocks with lever handle

parallel

alignment

straight gauge