172-65608MA-03 (RGDS) 5 Oct 2021
11
Normal Operation and Shutdown Procedures
Operating Procedures: Pressure Reducing Section
2. Pressure reducing section
2.1 Preparation
1. Supply electricity and air to the system.
2. Turn on the power for the control box.
3. Check whether the pressure sensor values are normal.
4. Check whether the valves before and after the system are open.
2.2 Verification for manual operation
1. Open the pressure control valve manually to 10%.*
(Verify that steam has started to flow.)
2. Wait 5 minutes for the hot air in the steam piping to be discharged.
3. Slowly open the pressure control valve (at a rate of approximately 10%
per 2 minutes), until the indicated pressure is approximately 0.2 MPaG
less than the target value.
* If superheated steam cannot be supplied to the steam-using equipment side,
perform the operating procedures for the desuperheating section in parallel with the
operating procedures for the pressure reducing section.
2.3 Verification for automatic operation
1. Verify that the pressure has reached approximately 0.2 MPaG less than
the target value and switch to automatic operation.
2. Verify that the steam pressure is stable at the target value.
Operating Procedures: Desuperheating Section
3. Pressure reducing section
3.1 Preparation
1. Supply electricity, air and water to the system.
2. Turn on the power for the control box.*
3. Check whether the temperature sensor values are normal.
4. If a pump is installed, start operating the pump.
5. Check whether the valves before and after the system are open.
3.2 Verification for manual operation
1. Open the temperature control valve manually to 10%.*
(Verify that steam has started to flow.)
2. Slowly open the temperature control valve (at a rate of approximately 10%
per 2 minutes), until the indicated temperature is approximately 10 °C less
than the target value.
3.2 Verification for automatic operation
1. Verify that the temperature has reached approximately 10 °C less than the
target value and switch to automatic operation.
2. Verify that the steam temperature is stable at the target value.
Check visually that the amount of condensate discharged by the separator is
normal.
* Unnecessary if sharing the same control box as the pressure reducing section.
