Emerson Fisher DFA Manuale di istruzioni - Pagina 9

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Emerson Fisher DFA Manuale di istruzioni

Instruction Manual

D103643X012

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

Temperature setpoint is not reached

Temperature is below setpoint

Water in steam line

Water in steam line when steam line isolated

Corrective Action

Check water source availability and pressure

Check nozzle(s) for plugging

Make sure that steam saturation pressure is not above setpoint

Check to ensure full actuator stroke is reached on the spraywater control valve

Check for proper orientation of nozzle in steam flow

Check temperature control loop - reset

Check nozzle for fouling/poor spray pattern - clean/replace

Check temperature sensor location - relocate per guidelines

Check for proper orientation of nozzle in steam flow

Check that steam traps are functioning properly

Check for proper spraywater control valve actuator installation

Replace spraywater control valve seat and plug assembly

DFA Desuperheater

August 2013