T5 Flare Gas Transducer Installation Guide 27
Chapter 2. Installing the Isolation Valves
Chapter 2. Installing the Isolation Valves
This chapter provides instructions for installing an isolation valve onto a nozzle for applications using the flare gas
insertion mechanism.
Note:
Installation of the isolation valves may have been done already during the hot tapping operation.
2.1 Bias 90° Installation (Standard or Extended Velocity Range)
2.1.1 For 3 inch Flanges
1. Obtain two suitable 3 in. ANSI flanged isolation valves. The valves should be a full bore type with either
150# RF flanges and a face-to-face length of 8 in. or 300# RF flanges and a face-to-face length of 11.125 in.
2. Install one of the isolation valves, including a suitable gasket, on each of the nozzles. Secure the valves with either
5/8 in. studs and nuts for 150# flanges or 3/4 in. studs and nuts for 300# flanges.
3. Orient the isolation valve handles to minimize interference during operation of the valves.
2.1.2 For 2 inch Flanges
1. Obtain two suitable 2 in. ANSI flanged isolation valves. The valves should be a full bore type with either
150# RF flanges and a face-to-face length of 7 in. or 300# RF flanges and a face-to-face length of 8.50 in.
2. Install one of the isolation valves, including a suitable gasket, on each of the nozzles. Secure the valves with
5/8 in. studs and nuts.
3. Orient the isolation valve handles to minimize interference during operation of the valves.
2.2 Tilted 45° Installation (Standard Velocity Range)
2.2.1 For 3 inch Flanges
1. Obtain two suitable 3 in. ANSI flanged isolation valves. The valves should be a full bore type with either
150# RF flanges and a face-to-face length of 8 in. or 300# RF flanges and a face-to-face length of 11.125 in.
2. Install one of the isolation valves, including a suitable gasket, on each of the nozzles. Secure the valves with either
5/8 in. studs and nuts for 150# flanges or 3/4 in. studs and nuts for 300# flanges.
3. Orient the isolation valve handles to minimize interference during operation of the valves.
2.2.2 For 2 inch Flanges
1. Obtain two suitable 2 in. ANSI flanged isolation valves. The valves should be a full bore type with either
150# RF flanges and a face-to-face length of 7 in. or 300# RF flanges and a face-to-face length of 8.50 in.
2. Install one of the isolation valves, including a suitable gasket, on each of the nozzles. Secure the valves with
5/8 in. studs and nuts.
3. Orient the isolation valve handles to minimize interference during operation of the valves.
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