General Information on Track Circuits - RGS Online

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Railway Group Approved Code of Practice GK/RC0752 Issue Two Date December 1998 Page E8 of 52 Withdrawn Document Uncontrolled When Printed <strong>General</strong> <strong>Information</strong> on Track Circuits 8.3 Pin Brazing Pin brazing is a method of connecting threaded pins to the rail using electric–arc brazing. This method will usually be used at new sites or where re–railing takes place and may be used on standard and hardened steel rails. Pin–brazed studs will be installed by Signal or Permanent Way Engineering staff; any person engaged in these operations must hold a Certificate of Competency for the task to be undertaken. An M12 pin brazed stud may be brazed to the rail web, as shown in Figure E5. The minimum spacing between connectors is 85mm. The correct torque for attachment of the rail lug to the M12 studs is 60Nm. NOTE Self Locking Nut (Supplied) to be tightened to a torque of 60Nm 200 240 E 8 R A I L T R A C K 115 Pin Brazed TEE Connector Figure E5 The threaded pins are brazed to the rail, at a position 57±2mm above the base of the rail, with a silver based filler metal, using a hand held brazing gun operated by either of the following pieces of equipment: Description Catalogue No. Portable machine, battery driven on single rail trolley, suitable for track maintenance, which will braze approx. 50 pins to the rail. : 20/3003 Large machine, battery driven on double rail trolley. The batteries are recharged by an integral petrol driven generator. This unit has a capacity for 50 brazes per hour and is suitable for new works. : 20/3001 57
Withdrawn Document Uncontrolled When Printed <strong>General</strong> <strong>Information</strong> on Track Circuits Railway Group Approved Code of Practice GK/RC0752 Issue Two Date December 1998 Page E9 of 52 Both of the above machines require the batteries and the brazing gun to be ordered separately. These are listed along with other spares and attachments as follows: Description Catalogue No. VF 2300 Brazing gun : 40/515 VF 2300 Angled gun : 20/3021 VF 2300 Extended gun : 20/3011 VF 2300KA Brazing gun : 20/3010 VFRG Batteries : 20/3002 VFLC Batteries : 20/3004 VFKA Batteries : 20/3007 VFKA 250 Battery unit : 20/3005 VFKA 250 Attache case : 20/3006 Battery charger for vehicle : 20/3008 Battery charger for depot : 20/3009 8mm Ceramic ferrule : 55/27287 9.5mm Ceramic ferrule : 55/16001 8mm Brazing pin : 55/27706 9.5mm Brazing pin : 55/41011 Spark shield : 40/543 Contact arm : 40/507 12mm/M8 Pin holder : 40/561 Contact set complete : 40/521 Contact nipple and disc : 40/555 Ejector rod complete : 40/536 Key set : 40/520 Screw set : 40/556 Rail bond 25mm x 500mm long : 88/23906 Rail bond 25mm x 145mm long : 88/23907 Rail Bond 25mm x 1500mm long : 86/43511 T connector M12 : 55/9366 Track end connector : 20/3013 V Connector 2 x 25mm x 90mm long : 46/2183 R A I L T R A C K E 9
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