Flowserve Gearex Rotary Gear Pumps External and Internal Bea User Manual download pdf (Page 28)

EXTERNAL GEAREX USER INSTRUCTIONS ENGLISH 71569246 (2167B-E1)

Flowserve Pump Division 28

4.11 Protection systems

The following protection systems are

recommended particularly if the pump is installed in a

potentially explosive area or is handling a hazardous

liquid. If in doubt consult Flowserve.

If there is any possibility of the system allowing the

pump to run against a closed valve or below minimum

continuous safe flow a protection device should be

installed to ensure the temperature of the liquid does

not rise to an unsafe level.

If there are any circumstances in which the system

can allow the pump to run dry, or start up empty, a

power monitor should be fitted to stop the pump or

prevent it from being started. This is particularly

relevant if the pump is handling a flammable liquid.

If leakage of product from the pump or its associated

sealing system can cause a hazard it is recommended

that an appropriate leakage detection system is

installed.

To prevent excessive surface temperatures at

bearings it is recommended that temperature or

vibration monitoring are carried out. See sections

5.9.4 Bearings and 5.9.5 Normal vibration levels,

alarm and trip.

The user should review the need for special operating

procedures and protective devices peculiar to the

particular installation involved. These may include

special start-up and shut-down procedures, over-

speed protection, temperature, flow and pressure

interlocks, protection against automatic start-up in the

event of power failure, surge protection, protection

from freezing, lack of prime protection, temporary

strainers in the suction line, vacuum breakers, etc.

Great care should be exercised during the erection of

piping to keep lines clean and free of dirt, scale,

threading or welding chips, etc. Such foreign matter

entering the pump may cause scoring of the body

bores and unnecessary breakdown and costly repairs.

For pumps having jacketed bodies, the jacket inlet

piping should always be made at the lowest inlet point

with the outlet at the top or highest point and the

opposite configuration when using a gaseous heat

transfer media. Provide a valve on the inlet piping so

that flow may be regulated to control temperature.

5 COMMISSIONING, START-UP,

OPERATION AND SHUTDOWN

These operations must be carried

out by fully qualified personnel.

5.1 Pre-commissioning procedure

5.1.1 Check-list

To avoid operational difficulties and to ensure a

trouble free initial start-up, the following additional

checks should be made.

1. Check that all piping has been properly bolted,

anchored and braced. If the system is

hydrostatically tested, ensure that the pump and

other equipment is properly vented and

adequately protected against excessive pressure.

(See Sections 4.11 Protection systems and 5.9.1

Venting the pump).

2. Flush the piping system, particularly the suction

line, to ensure that all foreign material has been

removed.

3. Check that all valves and automatic equipment

are operating properly.

4. Ensure that drivers are provided with properly set

over-load and/or overspeed protection devices as

required.

5. Check all auxiliary piping circuits.

6. Check that the gland nuts of a packed pump are

only finger tight and that the shaft can be turned

by hand.

5.1.2 Freezing

Precautions should be taken to prevent the liquid in

the pump or associated piping from freezing.

5.1.3 Lubrication

5.1.3.1 External bearing pump

Bearing lubrication is provided by lubricating oil

contained in housings located at both ends of the

pump.

Fill the bearing housings with the

correct grade of oil to the correct level, i.e. sight glass

or constant level oiler bottle.

When fitted with a constant level oiler, the bearing

housing should be filled by unscrewing or hinging

back the transparent bottle and filling the bottle with

oil. Where an adjustable body Trico oiler is fitted this

should be set to the proper height.

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Flowserve Gearex Rotary Gear Pumps External and Internal Bea User Manual Page 28

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