H3-FH-14B flender bochholt Helical gear Reduction Boxes H3

Flender/Flender Gear Units/Helical gear Reduction Boxes H3

er the welding specification chart attached. No welding shall be carried out ithout preheating the joint to 1C (5 ) when the ambient temperature is below 1 degree. ) Preheating shall be performed using resistance or induction heating methods. Preheating by gas burners, utilising any acetylene or oxy-propa ne gas mixtures, with neutral flame may also be carried out when permitted by th Engineer-in- charge. ) Preheating shall extend uniformly to atleast three times he thickness of the joint, but not less than 5mm, on both sides of the weld. ) Preheating temperature shall be maintained over the whole length of the joint during welding. Temperature indicating crayons or other tempera ture indicating devices shall be provided by the contractor to check the temper ature. ) Preheating temperature shall be maintained over the whole length of the joint during welding. Temperature recorders shall be provided by the Contractor to record the temperature. 1.1.2 In case of alloy steel materials such as Cr-Mo steels, if the post weld heat treatment is not performed immediately after welding, the weld joint and adjacent portion of pipe, at least 5 mm on either side of weld, shall be uniformly heated to 3c. This temperature shall be maintained for half an hour minimum, and then wrapped with . temperature specified in the Welding Specification Charts excee ds 3C, the same shall be followed. Similarly, if the welding specification char specifies post-heat time, the same shall be applicable. Post weld heat treatment as speci fied in the Welding Specification Chart shall be carried out later on. 1.1.3 Postweld Heat Treatment ) Post weld heat treatment, wherever required for joints bet ween pipes, pipes an fittings, pipe body and supports shall be carried out as per th relevant , Engineer-in