Helical gear Reduction Box H1 flender gearbox catalog H1SH-19-C

Flender/Flender Gear Units/Helical gear Reduction Box H1

- charge. In this regard procedure qualification to be done befor carrying out 1 of 1 STANDARD TECHNICAL SPECIFICATION MECON LIMITED REGD. OFF: RANCHI 8 OIL & GAS SBU, DELHI DOCUMENT NO. Page 2 of 6 TITLE MEC//0/2/0 REVISION : 0 PIPING FABRICATION AND ERECTION EDITION : 1 PWHT in production welds. ) per the requirements laid down in ANSI B3.8 and welding specification chart. ) The contractor shall submit for the approval of the Engineer-in-charge, the details of the post weld heat treatment procedure, as per Exhibit `' attached, that the propose to adopt for each of the materials/ assembly/ part involved, well before carrying out actual heat treatment. ) resistance or induction heating equipment as decided by the Engineer-in-charg . ) While carrying out local post weld heat treatment, techniq ue of application of heat must ensure uniform temperature attainment at all points of the portion being heat treated. Care shall be taken to ensure that width of treated band over which specified post weld heat treatment is carried out, he temperature attained is atleast as that specified in the relevant applicabl standards/ codes. ) Throughout the cycle of heat treatment, the portion outsid the heated band shall be suitably wrapped under insulation so as to avoid any harmful temperature gradient at the exposed surface of pipe. For this purpose temperature at the exposed surface of the pipes should not be allowed to exceed 4 qC. ) The temperature attained by the portion under heat treatme nt shall be recorded by means of thermocouple pyrometers. Adequate number thermocouples should be attached to the pipe directly at the eq ually spaced location along the periphery of the pipe joint. The minimum num ber of thermocouples attached per joint shall be 1 upto 6" dia, 2 upto 1" dia and 3 upto 1" and above. Howe