Masoneilan DSH Series Desuperheater Instruction Manual | 6
Copyright 2020 Baker Hughes Company. All rights reserved.
Replacing Nozzle Assembly
The Desuperheater spray nozzles are carefully assembled
and calibrated to provide the specified performance. When
replacing nozzles that have become blocked or damaged, only
disassemble the parts noted in the following instructions.
1. Remove the spray nozzle holder, shown in Figure 5, from
the nozzle housing.
2. Break the tack weld attaching the spray nozzle assembly to
the nozzle holder.
3. Unscrew the nozzle assembly from the nozzle holder.
The nozzle assembly, shown in Figure 6, is screwed
together and locked in place using a high temperature
adhesive to prevent the part from coming loose due
to the thermal expansion caused by the steam line.
This assembly should not be disassembled, and must
be purchased as a complete assembly.
4. Inspect the inside of the nozzle holder to ensure it is clean
and free of any debris.
5. Screw replacement nozzle assembly into nozzle holder.
6. Tack weld nozzle assembly to nozzle holder to ensure
nozzle does not unscrew while in line.
Note: To prevent blockage of the small nozzle orifices, an
inline strainer must be installed upstream of the valve. Table
3 provides a list of recommended strainer sizes.
Nozzle C
v
Strainer Mesh Size
0.4
200
0.8
200
1.5
100
3
100
5
100
10
50
Table 3 - Recommended Strainer Size
Failure to install the appropriate strainer can result
in blockage of nozzle. This can impact heat sensitive
systems.
Nozzle C
v
Threaded Plug Size
No. of Plugs Required
0.4
1/8”
2
0.8
1/8”
3
1.5
1/4”
3
3
1/4”
5
5
3/8”
4
10
1/2”
6
Table 2 - Nozzle plug size
