Emerson SAPAG Installation & Maintenance Instructions

SAPAG
SAPAG
Installation & Maintenance Instructions
Sapag Interlock changeover valves
1. Associated instructions
A Sapag Interlock is the association of two Changeover Valves plus the interlocking system.
Each individual Changeover Valve is to be operated and maintained as per the Changeover Valve
Installation and Maintenance Instructions SAPDR 0009 EN.
All related instructions must be read and understood before undertaking any action!
2. Site erection
The Sapag Interlocks are shipped either fully assembled with the associated safety relief valves or
separately.
Sapag Interlocks are fitted with plugged drain holes on each of the four branches. It is
advisable to connect these drain holes to appropriate stop and drain valves so that the
fluid contained in a closed branch can be drained before a safety relief valve is removed
from the installation
When the Interlock is shipped separately, the following assembly instruction shall be followed:
1. The piping must be absolutely clean from foreign matters.
2. Remove the flange protectors at the very last moment.
3. Handle the changeover valves and the safety valves with extreme care, avoid chocks and
damages.
4. Take care of the unbalance of these valves and use appropriate and secure lifting devices.
5. The changeover valves are shipped in the as-tested conditions and are normally tight and
closed; it might be necessary to tighten the packing rings at the time of pressurisation.
6. Ensure that the two changeover valves are in a position where the discs close the port
opposite to the stem and wheel.
7. Install the inlet changeover valve onto the piping.
Emerson reserves the right to change the contents without notice
Drain hole & plug
Fig. 1
Fig. 2
SAPDR-0011-EN-1307