3.696.5275.210
43
Piston Valves - Inspection and Replacement
(Fig. 27)
The IMI documentation included with the unit gives specifics for operation and maintenance
of all piston valves (Bottom Blowdown, Feedwater Inlet Tank and Generator, Feedwater
Tank Preheating System and Clean Steam Outlet). The drawing included with the unit will
give the exact location, as well as connection with other components. This information
should be reviewed before removal / replacement any valves.
∆
Steam, or high temperature water present situations that can be very
dangerous because of the high temperatures and pressures and follow all accepted
and recommended procedures when performing installation, operation, and
maintenance procedures to avoid possible injury or death.
∆
The combination of electricity, steam, and water can pose a very dangerous
situation. Turn off / disconnect all electric power before attempting any maintenance
procedures.
1. Follow the shutdown procedure to take the unit off-line before attempting to remove
and inspect the valve.
2. Ensure that the primary supply, condensate / water return line, feed water inlet, and
clean steam outlet have been shut off; that the pressure has been bled from both the
steam and primary supply systems; that the tank has been completely drained; and
that all components and surfaces have cooled.
3. If the unit is not completely drained and bled, steam or boiling water may be discharged.
4. Disconnect the wires leading from/to the electric cabinet, turn off the instrument air
source, bleed the pressure from the line, and disconnect the lines to the valve.
5. Disconnect the bolts.
6. Continue loosening the connections until the valve can be removed.
7. Examine the Valve for damage or incorrect positioning. For the exact procedure for
examination refer to the Spirax Sarco installation and maintenance manual included
with the unit.
8. To install a new valve, align with the feed lines and start the fittings. Follow
recommendations contained in the relevant IMI documentation.
9. After ensuring that the valve is correctly aligned, tighten the fittings.
10. Follow the startup procedures to put the unit back on-line. Carefully check all connections
for any sign of leakage.
Fig. 27
Piston Valve Example:
Tank feedwater
Summary of Contents for CSM-C
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