Maintenance; Servicing - Fisher TBX-T Instruction Manual

Instruction Manual
D103796X012
percentage of spraywater. Consult the TBX-T cooler sizing sheet provided with the unit for this temperature sensor
distance. The steam line should not have any branch lines dividing the steam flow between the TBX-T
desuperheater and the temperature sensor. If you have any questions, contact your local
Local Business Partner.
8. A typical installation is illustrated in figure 2. A temperature sensor (TE) measures changes in temperature and a
temperature transmitter (TT) transmits the signal to the temperature control device. The output signal from the
controller is sent to the positioner on the cooling water (spraywater) control valve (SWCV). The positioner's output
signal strokes the SWCV open, increasing water pressure on the nozzles. Increasing water pressure upstream of the
nozzles increases water flow through the nozzles.
CAUTION
Pneumatic lines (where applicable) should be thoroughly blown clean with dry air before connection. Check electronic
lines for correct connection.

Maintenance

Table 2. Inspection Summary
Key Part Description
Steam Pipe
1
(not replacement part)
Nozzle Body
2
(not replacement part)
3 Nozzle Sleeve
7 Nozzle Body Flange
10 Spray Nozzle

Servicing

WARNING
Avoid personal injury or property damage from sudden release of process pressure or bursting of parts. Before performing
any maintenance operations:
D Always wear protective gloves, clothing, and eyewear when performing any maintenance operations to avoid personal
injury.
D Use bypass valves or completely shut off the process to isolate the desuperheater from process pressure. Relieve
process pressure from both sides of the valve. Drain the process media from both sides of the desuperheater.
D Use lock‐out procedures to be sure that the above measures stay in effect while you work on the equipment.
D Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
Inspection Tips and Diagnostics
Inspect for erosion, thermal fatigue, and other
damage.
Inspect for erosion, thermal fatigue, and other
damage.
Inspect for particulate or magnetite buildup when
spray nozzles are replaced.
Inspect gasket surfaces for damage that could indicate
gasket leakage when spray nozzles are replaced.
Refer to Nozzle Maintenance Section.
Emerson sales office
Repair
Consult your local Emerson Service Center for a recommendation on
necessary weld repair or replacement
Consult your local Emerson Service Center for a recommendation on
necessary weld repair or replacement
Clean if necessary.
Replacement Only
TBX-T Desuperheater
July 2017
or
Replacement
As needed
As needed
Replacement every 24-36 months
for optimal performance
5