Instruction Manual
D103643X012
DFA Desuperheater
August 2013
9
DFA Installation
1. Place the desuperheater portion of the DFA into the line and align with the pin. Nozzles should face downstream.
2. Insert the gasket into the lower portion of the DFA.
3. Slowly lower the valve body onto the desuperheater portion and ensure that the alignment pin from the lower
portion slides into the corresponding hole in the valve body.
4. Completely lower the valve body onto the lower portion and bolt into place using the recommended line gasket
bolting torques.
Troubleshooting
Table 8 is intended as a basic first line troubleshooting guide. Contact your local Emerson Process Management sales
office representative for assistance if you are unable to resolve your field operation problem.
Table 8. Troubleshooting Guide
Problem
Corrective Action
Temperature setpoint is not reached
Check water source availability and pressure
Temperature setpoint is not reached
Check nozzle(s) for plugging
Temperature setpoint is not reached
Make sure that steam saturation pressure is not above setpoint
Temperature setpoint is not reached
Check to ensure full actuator stroke is reached on the spraywater control valve
Temperature setpoint is not reached
Check for proper orientation of nozzle in steam flow
Temperature is below setpoint
Check temperature control loop - reset
Temperature is below setpoint
Check nozzle for fouling/poor spray pattern - clean/replace
Temperature is below setpoint
Check temperature sensor location - relocate per guidelines
Temperature is below setpoint
Check for proper orientation of nozzle in steam flow
Water in steam line
Check that steam traps are functioning properly
Water in steam line when steam line isolated
Check for proper spraywater control valve actuator installation
Water in steam line when steam line isolated
Replace spraywater control valve seat and plug assembly
