Case

1. Blowdown valves shall be provided for low point drains in the turbine casing.

Piping, General

1. Inlet and exhaust piping installation shall be as per Figures 1, 2, or 3.

2. Inlet and exhaust valve installation shall permit the complete drainage of accumulated condensate before valve opening. Pipeline or body drains may be installed on the pressure side of the valve.

3. Valves installed in horizontal pipe runs shall be positioned with stems extending vertically upward or horizontal, or any intermediate position, providing the stem is above the horizontal center line.

Figure C-1: Auto-start turbines.

Figure C-2: Manual start turbines with integral trip valve.

Figure C-3: Manual start turbines with trip and throttle valves.

1. Inlet pipe of all turbines shall have:

   • Block valve

   • Y-type strainer

   • Low point drains and/or traps.

2. Exhaust pipe of all back-pressure turbines shall have:

   • Block valve

   • Low point drains and/or traps.

Inlet Piping

1. A block valve shall be installed in the inlet piping.

2. Steam traps and drains shall be installed at all low points in inlet piping.

3. A Y-type strainer, with a valved blowdown to a safe location, shall be installed between the inlet block valve and the inlet flange.

4. A control valve shall be provided for auto-start turbines and shall be located near the turbine.

5. A valved bypass shall be installed around the auto-start control valve.

Exhaust Piping

1. A block valve shall be installed in the exhaust piping on all back pressure turbines.

2. Steam traps and drains shall be installed at the low...