Flowserve Desuperheaters - Manual (Page 11)

11
Desuperheaters FCD VLENIM0115-00 – 09/11
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DESUPERHEATER INSTALLATION (LANCE MOUNTED)
1. The desuperheater mounting flange and the cooling water flange are manufactured with the bolting
holes straddling the steam pipe centerline and the nozzle head. Exceptions to this rule must be
clearly stated on the Technical Requirement Sheet when the desuperheater is ordered.
c WARNING: When unpacking the desuperheater, care should be given to prevent foreign
particles from entering the cooling water flange opening. These particles can block the
small passages in the nozzles and impede water atomization.
2. Before installing, physically measure the distance from the mounting flange gasket surface to the
center of the nozzle head. Ensure that this distance is equal to the distance between the gasket
surface plus gasket thickness of the steam pipe mounting flange and the steam pipe centerline.
This is to ensure the spray nozzles are centered in the steam pipe. See Figure 10.
Figure 10: View of spray nozzle centered in steam pipe
NOTE: To ensure nozzles remain securely fastened, nozzles are tack welded to the lance at the factory.
3. Remove the covers from the desuperheater openings. While positioning the desuperheater in the
steam line, ensure that the nozzle head is on the steam downstream side of the desuperheater
lance. Use a line gasket appropriate for the pressure class on the mounting flange and the cooling
water flange.
4. Before connecting the cooling water line to the desuperheater the following is recommended:
a. A cooling water supply with particles less than 0.005 inch (.13 mm) diameter. If particles larger
than this could be present, a strainer should be installed.
b. Flush the water line and cooling water control valve to eliminate contamination.
Centerline of nozzle coincides
with centerline of steam pipe