Emerson ACE97 Manuel d'instructions télécharger pdf (Page 8)

Type ACE97

Startup, Adjustment, and Shutdown

CAUTION

If required, tank vents (normal

and emergency) must be in place

and operating.

Startup

CAUTION

Always open the tank shutoff valve prior

to the inlet shutoff valve. Failure to do

so could result in inlet pressure being

applied to the actuator casing, potentially

damaging it. Refer to Figure 5.

1. Open the tank and sensing line shutoff valves

(between the Type ACE97 valve and tank).

2. A tank vapor space pressure gauge should be

installed and visible.

3. Slowly open the inlet shutoff valve (to the pad

valve) and leave it fully open.

4. Monitor the tank vapor space pressure.

Adjustment

The setpoint of this unit is factory set. If an adjustment

is to be made, it should be made in small increments

while the unit is controlling tank pressure. It is difcult

to make eld adjustments due to the slow changes in

tank pressure.

To change the pad (blanketing) setpoint:

1. Disconnect the tubing from the depad pilot valve

(See Figure 6).

2. Loosen the locknut (See Figure 7), but maintain its

position in relation to the adjusting coupling.

Doing so leaves the depad setpoint unchanged.

3. Separate the depad pilot valve from the actuator

by unthreading and removing.

4. Unthread and remove the adjusting coupling.

5. Increase the pad setpoint by turning the adjusting

screw clockwise. (Turning the screw counterclockwise

decreases the setpoint). See Figure 7.

6. Replace the depad adjusting collar against the

locknut to re-establish the depad setpoint.

To change the depad setpoint:

1. Loosen the locknut below the adjusting coupling.

2. Rotate the collar to change the setpoint. (The

bottom of the coupling—nearest the locknut—is

left-hand threaded).

3. Tighten the locknut.

E0679

Figure 7. Changing the Pad Setpoint

ADJUSTING SCREW

LOCKNUT

Figure 6. Unthreading the Adjusting Coupling

E0678

TUBING

COUPLING

ACTUATOR

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 31 32

Type ACE97 Pad-Depad Valve 1
Type ACE97 10

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Emerson ACE97 Manuel d'instructions Page 8

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