AC Fire Pump Series 1580 Manual de instrucciones - Página 6

Navegue en línea o descargue pdf Manual de instrucciones para Bomba de agua AC Fire Pump Series 1580. AC Fire Pump Series 1580 8 páginas. In-line mounted centrifugal fire pumps

Imprimir página

SERVICE INSTRUCTIONS

WARNING: Unexpected Startup Hazard

Disconnect and lock out power before servicing.

Failure to follow these instructions could result in serious

personal injury or death, and property damage.

1. Close valves on suction and discharge sides of pump. (If

no valves have been installed, it will be necessary to drain

the system).

Caution: Extreme Temperature Hazard

Allow pump temperature to reach acceptable level

before proceeding. Open drain valve, do not proceed until

liquid stops coming out of drain valve. If liquid does not

stop flowing from drain valve isolation valves are not seal-

ing and should be repaired before proceeding. After liquid

stops flowing from drain valve, leave drain valve open and

continue. Remove the drain plug located on the bottom of

the pump volute. Do not reinstall plug or close drain valve

until reassembly is completed. Failure to follow these

instructions could result in moderate personal injury or

property damage.

2. Loosen volute capscrews, do not remove them. Using cap-

screws in the jack screw holes start to remove the pump

assembly from the volute.

WARNING: Excessive System Hazard

Make certain the internal pressure is relieved before

continuing. Failure to follow these instructions could result

in serious personal injury or death, and property damage.

3. Remove seal flushing tube, if used.

Remove the volute capscrews and remove the pump

assembly from the volute.

4. Remove the impeller capscrew, lock washer and washer.

Remove the impeller.

STUFFING BOX CONSTRUCTION

WITH PACKING

1. Remove hex nuts from packing gland and remove cover-

plate capscrews. Remove coverplate from bracket.

2. Remove packing rings from the stuffing box.

3. Check condition of shaft sleeve and replace if scored or

otherwise damaged. Note: Replace gasket between sleeve

and impeller as well if damaged.

4. Insert two packing rings in the stuffing box followed by the

lantern ring and then the remaining two pieces of packing.

Make certain that the packing joints are staggered 90

degrees.

5. Install, but do not tighten the packing gland.

6. On the 6x6x9

and the 6x6x11 pumps the volute and

coverplate have rings. Inspect and replace if necessary.

7. Install coverplate over the pump shaft, tighten capscrews

(per torque chart).

8. Tighten packing gland to compress packing.

9. Install impeller, impeller gasket, impeller washer, lock washer

and capscrew, then tighten (per torque chart).

10. Install new volute gasket then install pump assembly into

volute. Tighten volute capscrews (per torque chart). Install

seal flushing tube. Install drain plug, close drain valve.

11. Open isolation valves, inspect pump for leaks, if not leaking

return pump to service. (See note for packing adjustment.)

NOTE:

Before starting pump, back off packing gland nuts or screws

until glands are loose. Re-tighten with fingers until glands are

just snug against the first packing ring. After pump is running

at first start, water may run freely from packing. This is normal

and should be allowed to continue for a period of time before

further tightening of the glands. Take up gland bolts uniformly,

one flat at a time.

An adequate leakage rate is not one single valve for all pumps

and installations, but is the amount required to provide ade-

quate cooling and lubrication. The required leakage will be

largely influenced by operating pressure, fluid temperature,

shaft speed, etc.

For fluid temperatures in the range of 32° to 190°F, average

leakage rates of 60 to 80 drops per minute are recommended.

However, each individual pump and installation will have

unique operating conditions that will result in broadly variable

leakage rate requirements.

At fluid operating temperatures near the upper limit of 190°F,

the maximum temperature rise of the leakage is particularly

important. A packed pump should never operate with steam

forming at the gland. This necessarily limits the temperature

rise to a maximum of about 20°F. If the formation of steam

persists at higher leakage rates, cooling water must be provided

by means of an external supply, or a heat exchanger used to

cool the by-pass flush.