Flowserve Desuperheaters - Manual (Page 16)

Desuperheaters FCD VLENIM0115-00– 09/11
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8. If large capacity nozzles are required: Obtain the new nozzles from the Flowserve factory. The
nozzles will be sized according to the new process conditions and made to fit the existing nozzle
head. Ensure that the nozzle mounting cavities are cleaned prior to installing and tightening the
nozzles with a screwdriver.
9. Install the nozzle head case onto the nozzle head face and tighten to at least 12 ft-lbs (16.2 N-m) of
torque.
10. With similar weld metal (usually 316 SS), tack weld the nozzle head case to the nozzle head face in
two locations.
11. Inspect lance for wear, leaks, or cracks. Replace or repair if necessary.
12. Install the nozzle head assembly onto the lance pipe connection with at least 1 to 3 turns beyond
finger tight.
13. With similar weld metal (usually 316 SS), tack weld the nozzle head in two locations onto the lance
pipe connection.
14. Install the desuperheater into the steam pipeline in the reverse order that it was removed.
Figure 14: Cross-section of VaporCool Lance
Cooling Water
Flange
Nozzle Head
Case
Lance Pipe
Connection
Mounting Flange
Nozzle
Nozzle Head Face
Lance