Armstrong 4360 설치 및 운영 지침 매뉴얼 - 페이지 8

{카테고리_이름} Armstrong 4360에 대한 설치 및 운영 지침 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. Armstrong 4360 14 페이지. Vertical in-line pump
Armstrong 4360에 대해서도 마찬가지입니다: 설치 및 운영 지침 매뉴얼 (12 페이지)

페이지 인쇄

i n sta l l at i on &

op era t i ng i n str u ct i on s

In open systems, test suction line for air leaks before starting;

this becomes essential with long suction line or static lift.

Install, at the pump suction, a straight pipe of a length

equivalent to 4 or 6 times its diameter; this becomes essential

when handling liquids above 120°f (49°c). Armstrong suction

guides may be used in place of the straight pipe run and in-

line strainer.

Install an isolation valve in both suction and discharge lines on

flooded suction application; these valves are used primarily to

isolate the pump for inspection or repair.

Install a non-slam non-return check valve in discharge line

between pump and isolation valve to protect pump from

excessive back pressure and to prevent water running back

through the pump in case of driver failure on open systems.

An Armstrong Flo-Trex valve may be used in place of non-

return check valve and isolation valve on pump discharge.

caution:

Only the discharge valve is to be used to throttle pump

flow, not the suction valve. Care must be taken in the

suction line layout and installation, as it is usually the

major source of concern in centrifugal pump applications.

2 . 4 alignment

Alignment is unnecessary on close-coupled pumps, Series

4360 & 4380, as there is no shaft coupling.

Series 4300 units are accurately aligned at the factory prior to

being shipped and do not need re-aligning when installed.

Alignment on a Series 4300 unit may be verified by assuring an

equal and parallel gap between coupling halves on both sides of

the coupling.

oper ation

2 .5 starting the pump

Ensure that the pump turns freely by hand, or with

some gentle mechanical help such as a strap or Allen

key in coupling bolt.

Ensure that all protective guarding is securely fixed in position.

Commercial pumps Series 4300, 4360 and 4380

Vertical In–Line pumps

The pump must be fully primed on start up. Fill the pump cas-

ing with liquid and rotate the shaft by hand to remove any air

trapped in the impeller. On Series 4300 any air trapped in the

casing as the system is filled must be removed by the manual

air vent in the seal flush line. Ensure entrained air is removed

from series 4300 pumps, prior to starting, through the air

vent on the seal flush line. Open vent until clear of air.

Series 4360 & 4380 units are fitted with seal flush/vent lines

piped to the pump suction area. When these units operate re-

sidual air is drawn out of the pump towards the suction piping.

'Bump' or energize the motor momentarily and check that the

rotation corresponds with the directional arrow on the

pump casing.

To reverse rotation of a three phase motor, interchange any

two power leads.

Start the pump with the discharge valve closed and the suction

valve open, then gradually open the discharge valve when the

motor is at operating speed. The discharge valve may be open

slightly at start up to help eliminate trapped air.

When stopping the pump: Close the discharge valve and

de-energize the motor.

Do not run the pump against a closed discharge valve for an

extended period of time (a few minutes maximum).

Star-Delta motor starters should be fitted with electronic/me-

chanical interocks that have a timed period of no more than 40

miliseconds before switching from star (starting) to delta (run)

connection yet allow the motor to reach full star (starting)

speed before switching to delta (run).

Should the pump be noisy or vibrate on start-up a common

reason is overstated system head. Check this by calculating the

pump operating head by deducting the suction pressure gauge

value from the discharge gauge reading. Convert the result into

the units of the pump head as stated on the pump nameplate

and compare the values. Should the actual pump operating

head be significantly less than the nameplate head value it is

typically permissable to throttle the discharge isolation valve

until the actual operating head is equal to the nameplate value.

Any noise or vibration usually disappears. The system

designer or operator should be made aware of this as some

adjustment may be required to the pump impeller diameter or

drive settings, if applicable, to make the pump suitable for the

system as installed.