Instruction Manual
D104734X012
ATST Desuperheater
July 2022
6
Servicing
Table 2. Inspection Summary
Key
Part Description
Inspection Tips and Diagnostics
Repair
Replacement
1
Steam Pipe
(not replacement part)
Inspect for erosion, thermal fatigue,
and other damage
Consult your local Emerson Service Center or
Emerson Accredited Service Provider for a recommendation
on necessary weld repair or replacement
2
Nozzle Body
(not replacement part)
Inspect for erosion, thermal fatigue,
and other damage
Consult your local Emerson Service Center or
Emerson Accredited Service Provider for a recommendation
on necessary weld repair or replacement
3
Nozzle Alignment Pin
Refer to Nozzle Maintenance Section
As needed
7
Nozzle Body Flange
Inspect gasket surfaces for damage
that could indicate gasket leakage when
spray nozzles are replaced
Replacement Only
As needed
10
Nozzle
Refer to Nozzle Maintenance Section
Replacement every 30-42 months
for optimal performance
12
Steam Pipe Liner
(not replacement part)
Inspect for erosion, thermal fatigue,
and other damage
Consult your local Emerson Service Center or
Emerson Accredited Service Provider for a recommendation
on necessary weld repair or replacement
Nozzle Maintenance and Replacement
When subjected to normal operating conditions, it is possible that wear, blockage, and/or fatigue will occur to the
nozzle assembly. During regularly scheduled maintenance, visually inspect the nozzles for wear and blockage. Your
local Emerson Service Center or Emerson Accredited Service Provider can help to determine the extent of fatigue and
the correct course of action. Poor performing nozzles or nozzle failure is typically caused by wear, corrosion, erosion,
and/or blockage. The following instructions will help to determine if any of these problems are present and provide a
recommended course of action for each.
Note
For optimal performance, nozzles should be inspected every 18-24 months and replaced every 30-42 months.
1. Loosen and remove the nozzle body flange stud nuts (key 6) and washers (key 4). Then, remove the nozzle body
flange assembly (key 7). Inspect the nozzle body flange gasket surfaces for damage. If damage is present,
replacement is necessary.
Figure 3. Fisher ATST Nozzle
X1886
