Velocity Edge GX325 Manual de usuario descargar pdf (Pagina 30)

Tightening Sequences

START-UP PROCEDURES

Precautions Prior to Start-Up

1. If there is particulate matter in the process streams, contact

your Tranter sales/service ofﬁ ce to determine if a pipeline or

in-port strainer should be used before operating the unit.

2. Conﬁ rm that the plate pack length is correct.

3. Open all outlet valves completely.

4. Completely close the pump discharge valves to the heat

exchanger.

5. Provide venting on both sides of the heat exchanger to

facilitate the removal of air from the system.

6. Start pumps and increase the pressure by opening the pump

discharge valve slowly.

7. When all air is out, liquid will ﬂ ow out of the vent. Close

the vent.

8. Slowly and simultaneously open the inlet valves for both ﬂ uids

to avoid extreme over-pressure due to hydraulic shock.

9. Control the amount of heating or cooling by using throttling

valves and product thermometers in conjunction.

Figure 41

Tightening sequence for all units.

WARNING: Do not tighten the plate heat exchanger

when it is holding liquid, under pressure or

operating. Rupture of the gaskets and exposure to

physical injury may occur. Always cool and drain the

heat exchanger before tightening.

CAUTION: To reduce the possibility of water hammer,

do not use fast opening and closing valves. The

pressure surge caused by a sudden change in the ﬂ uid

velocity can be several times higher than the normal

operating pressure of the system.

Figure 41 gives the tightening sequence for all units. When

facing the stationary frame, tighten using the 1, 2, 3 and 4 bolts

in sequence as far as possible before installing the remaining bolts.

Be careful to tighten uniformly so that the moveable frame is

kept parallel with the ﬁ xed frame within 1/4 in. Check the plate

pack length on both sides of the plate pack at all tightening bolt

locations. Tighten the unit, according to this procedure, to the

plate pack dimension stated on the assembly drawing or unit data

plate. Measure the dimension with a metal tape and tighten all

bolts within 1/32 in. of the “A” dimension. (See Table 3.)

4 bolt unit 6 bolt unit 8 bolt unit 10 bolt unit 12 bolt unit 14 bolt unit 16 bolt unit 18 bolt unit 20 bolt unit

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 47 48

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Velocity Edge GX325 Manual de usuario Pagina 30

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