Oval EX DELTA II, Инструкция по эксплуатации

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D-583-2N-E
5
Fig. 6.6
6.4.2 Installation Procedure
(See assembly drawing in Fig. 6.5 on page 4.)
By turning in or out handwheel, the probe of this flowmeter goes down or up and, without the need of
interrupting the line, it can be drawn out. When the meter is placed in service for measurement, the hold-down
disc is so positioned as to come in contact with the retaining ring (the guide is at match mark "A" on the stud).
During maintenance or inspection, allow the probe to be housed completely in the short pipe (the guide is at
match mark "B" on the stud) and remove the meter from above the gate valve.
When removing or installing it, exercise care to minimize the possibility of unexpected trouble by observing the
following instructions:
() Install the hold-down disc in the right physical orientation.
(2) As the probe passes through the opening in the gate valve, make sure that the gate valve is in its fully
opened position when the probe is inserted, and that the probe is hoisted completely above the gate valve
when the gate valve is closed before attempting to remove or install.
(3) Be aware of the internal pressure when you remove the flowmeter. (Allow the pressure to escape through
the vent valve before attempting to remove the meter.)
(4) Directions of handwheel rotation
Clockwise rotation (viewed from top) → Probe descends.
Counterclockwise rotation (viewed from top) → Probe ascends.
Installation Instructions
() Install the hold-down disc between the mounting
nozzle (mounting flange) and gate valve.
- Use extra care to install the hold-down disc
in the right physical orientation at this time.
Ensure that the arrow mark on the side of
hold-down disc conforms to the actual flow
direction and that the arrow mark is on the left
hand side as viewed from the flow direction
(upstream side).
- Install a gasket on top and bottom of the
hold-down disc.
(2) Install the meter.
- Remove protective caps provided on the
sides.
- Ensure that the arrow mark on the cover
conforms to the flow direction.
- Ensure that the flanges of short pipe, gate
valve and hold-down disc are in line with the
FLOW
DIRECTION
HOLD-
DOWN DISC
TAPERED
FACE UP
ARROW MARK
periphery and the center mark (V-groove).
(3) With the gate valve fully open, insert the probe until the retaining ring comes into contact with the hold-down
disc by turning the handwheel. The guide should be at the match mark (V-groove) on the stud at this time.
- Ensure that the vent valve is fully closed and that the fitting bolts are tight.
- In the event a leak persists through the gland packing, retighten the bolts holding the packing retainer.
Removal Procedure
(1) Disconnect wiring of the preamplifier.
(2) By turning the handwheel, retract the probe.
Retract it until the guide arrives at match mark "B" on the stud.
(3) Confirming that the probe has been retracted completely, fully shut off the gate valve.
(4) Taking precautions against internal pressure, carefully open the vent valve, allowing the internal pressure to
escape.
(5) Remove the flowmeter form above the gate valve.