b'FLOATING BALL VALVES - SLFSBV01 & SLBV01 SERIESWELDING INSTRUCTIONS Local welding regulations and specification must becomplied with when carrying out welding work.Remove any paint and rust around the weld area on the pipe and welded end of the ball valve.Check that the ball valve is correctly positioned andaligned with the pipeline.Where weld connection is close to seat area, due to short length of the welded ends there is a risk that the soft inserts may be destroyed during the welding work. Hence the following procedure is advised: -Use temperature measuring strips to check that the temperature does not rise beyond the permissible limits (160C). The strips must be fitted to the connection near the soft inserts. These temperature measurements strips are designed so that, when a type-dependent temperature is reached, the colour irreversibly changes from white to black. The temperature measurement strip must be monitored constantly throughout the welding work. If any change of colour is noticed, the welding work must be interrupted immediately and the weld allowed to cool.2.3.4 Buttweld End ValvesClean the weld ends as necessary and weld into the line using an approved weld procedure. Make sure the pipe and valve body material given on the valve body or nameplate is compatible with the welding procedure. (Refer our compatibility cross reference chart for equivalent pipe, valve & fittings grades at the Technical section of our website). Soft seats can be damaged during welding, take steps to ensure valve is not over heated, especially smaller size valves (see above caution note).2.4 VALVE INSTALLATION BY WELDINGLeave valves in the full open position during installation, welding and post-weld heat treatment. This will reduce temperature transmission to soft seats. After welding completion, open the valve and flush line to clean out any foreign matter. Valves over 65 NB ( 2 1/2) have minimal risk of temperature damage to seats.For valves up to 80 NB (3) the welding temperature can adversely affect the PTFE and elastomer components. Follow the welding instructions above and use temperature measuring strips to monitor temperature. It will be the responsibility of the operator to ensure valves are kept cool during welding and then post-weld testing of the valve should be performed. Larger size valves over 80 NB (3) are less likely to transmit heat to seat and stem packing during welding but still care should be taken. Depending on class, valves under 50 NB (2) should have pup ends fitted to avoid seat damage. If not fitted ensure valve body temperature is kept cool. Temperatures over 180C can damage seats & seals.8 Australian Pipeline Valve - Installation, Operation and Maintenance Manual'