Panametrics T5 - Hot Tapping the Pipe; Cold Tapping the Pipe

Chapter 1. Installing Pipe Nozzles
26 T5 Flare Gas Transducer Installation Guide
1.3.7 Hot Tapping the Pipe
Note: Hot tapping a tilted 45° installation is possible only for the standard velocity range (100 m/s, 328 ft/s). For the
extended velocity range (120 m/s, 394 ft/s), only the 4” pipe size can be hot topped.
1.3.7.1 Hot Tapping For 3” Flanges
To hot tap the pipe for 3” flanges, complete the following steps:
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.
4. Hot tap holes in the pipe using a hot tap machine equipped with a 3/4 in. (19.05 mm) drill bit.
5. Then use a coupon retaining hole saw to cut a hole with a diameter of 2.36 in. (60 mm) minimum to
2.875 in. (73 mm) maximum.
1.3.7.2 Hot Tapping For 2” Flanges
To hot tap the pipe for 2” flanges, complete the following steps:
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.
4. Hot tap holes in the pipe using a hot tap machine equipped with a 3/4 in. (19.05 mm) drill bit.
5. Then use a coupon retaining hole saw to cut a hole with a diameter of 1.81 in. (46 mm) minimum to
1.89 in. (48 mm) maximum.
1.3.8 Cold Tapping the Pipe
The cold tapping procedure is the same as the hot tapping procedure described above for a standard velocity range
(100 m/s, 328 ft/s) installation. Except for the 4 in. pipe size, cold tapping can be performed only before the isolation
valve is installed. The hot tap machine is used directly on the nozzles, and the isolation valves are added after the
tapping process has been completed.
WARNING! Hot tapping should only be performed by qualified personnel. Follow all applicable code
and safety practices during these procedures.
WARNING! Cold tapping should only be performed by qualified personnel. Follow all applicable
code and safety practices during these procedures.