Dragon Wholesaling 178 Series Instructions d'installation, d'utilisation et d'entretien - Page 7

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Check Pump Rotation

Most pumps manufactured have clockwise rotation when viewed from the coupling end. The cor-

rect rotation can be found by an arrow on the casing.

It is very important that the pump rotation is determined before starting the pump. If the 178

Series is turned backwards it will not operate as designed.

The best way to check rotation is to disconnect the coupling, but it can be checked without dis-

connecting the coupling. One person should be at the pump watching the shaft while a second

person starts and then immediately stops the pump so the shaft barely turns over.

Priming the Pump

Be sure the pump has fluid in the casing before running. If the pump is operated without fluid, the

packing can be destroyed in one minute. Vent air from the suction line and fill it with liquid. Start

the pump with the discharge valve cracked open. After discharge pressure stabilizes, gradually

open the discharge valve to the required position. If flow is lost, close the discharge valve and

wait a few seconds for the discharge pressure to build. Continued flow difficulty indicates improp-

er pump selection or installation. Run the pump with the discharge valves closed only for short

periods of time. The energy going into the pump heats the fluid in the casing. If the pump needs

to operate shut in some of the time, be sure to install a small line (1/4 or 1/2 inch) back to the

suction tank between the discharge valve and the pump for cooling.

Packing

Loosen the packing on startup. The gland bolt nut should be only finger tight. New packing will

expand faster with heat than older packing. Therefore, new packing must be adjusted more slow-

ly than old packing. Too tight and it will not leak. With no cooling it will burn and be no good for

sealing.

Start-Up Checklist

1. Pump rotates freely by hand.

2. Coupling aligned.

3. Oilier full and oil level correct.

4. Suction valve fully open.

5. Pump and suction line full of fluid.

6. Discharge valve is slightly open, not fully open. Fully open the discharge valve after the

pump is running.

PART III- OPERATION

Maximum Operating Conditions

Note: These maximum operating conditions apply to pumps which are exposed to room tempera-

tures without external insulation.

1. Cast Iron: Maximum working pressure is 175 psig at 150° F or 150 psig at 250° F.

Interpolate for pressure between 150° and 250° F maximum.

2. Steel: Maximum working pressure and test pressure in accordance with ANSI B 16.5-1973,

Tables 2.1 through 2.23 and Table 3.

3. For H-30 and SUPREME HARD alloy, contact Dragon distributor.

4. Cooling water through the lantern ring is required when fluid being pumped is between 150°

and 250° F. In addition, it may be necessary to run water over the exposed shaft to prevent

excessive heat build up at the lip seals and bearings.