Flanged Joints. Flanges shall comply with IS 7322 / BS 4504. The nominal pressure rating shall be at least equal to the highest pressure rating of the pipes or fittings to which they are attached. The Contractor shall fabricate flanges meeting the requirements of pipe sizes under this Contract or otherwise to suit the abutting valves or other connections as required. Flanges shall be provided with all necessary nuts, bolts, washers and gaskets, as specified herein. The Contractor shall also apply graphite grease to the bolt threads when joints are made.
Flanged Joints. 1) Where indicated, the pipe shall be connected to other pipe or fittings with flanges.
Flanged Joints. 1. Unless otherwise indicated, comply with AWWA C228, Class SD.
Flanged Joints. Flanged joint should be made by painting the facing of the flange with white lead freely and bolting up evenly on all sides. A thin fibre of lead wool may be very useful in making the joints water tight where facing of the pipes is not true. When packing must be used, it should be of rubber insertion three ply and of approved thickness. The packing should be of the full diameter of the flange with proper pipe hold and bolt holes cut out evenly on both the inner and outer edges. Where the flange is not full faced, the packing may be of diameter of the packing strip only, proper placing of the packing should be checked before another pipe is jointed on.
Flanged Joints. Gaskets shall extend to inside the bolt holes, and flanges shall be brought up truly and water and air tight on gaskets by tightening bolts on opposite sides of the pipe.
Flanged Joints. TS-429 All flanged joints shall be flush and truly aligned and made with approved corrugated rings, compressed asbestos or composition joints. Flanges for connection to welded pipes shall be “slip on” or welding neck standard steel type made as indicated in the schedules. Flanges or unions shall be provided on straight runs at not greater than 12 meter intervals. Wherever possible, at piping connections to equipment, valves or other units requiring maintenance, servicing, or possible removal, the connecting joint shall be made by means of unions or flanges. Pressure rating or flanges shall match the pressure of the flanges on the equipment to which the pipe connected.
Flanged Joints. Where flanged pipework, valves, etc., are to be connected, the insertion material shall be cut to the correct size and provided with bolt holes. The insertion material shall be positioned immediately prior to the two flanges being brought together and the whole joint must then be bolted together by tightening diametrically opposite bolts in sequence.
Flanged Joints. Where two pipes are required to be joined by using flanges, the following method is adopted. The flange is slipped on one of the pipe and the PIPE-END (COLLAR) is butt- welded to that end of the pipe. The PIPE-END serves two purpose. It restrains the flanges, which is flush with the back surface of PIPE- END. The outer surface of the PIPE-END is plain, flat, serving as a base for the rubber gasket. Similarly PIPEEND and flange are fitted to the other pipe to be joined. A rubber gasket is to be used in between the two PIPE-END. The gasket should have a hole of the same size as the pipe and the surface same as that of the PIPE-END. After bringing the two PIPE-ENDS together, the flanges should be tightened by using bots and nuts. Since polyethylene flanges are liable to bend when bolts are tightened, use of metallic flanges, 6mm to 10 mm thick, in addition to polyethylene flanges is done. A metal flange is incorporated during molding stage of polyethylene flanges.
Flanged Joints. Align flange surfaces parallel. Assemble joints by sequencing bolt tightening to make initial contact of flanges and gaskets as flat and parallel as possible. Use suitable lubricants on bolt threads. Tighten bolts gradually and uniformly to appropriate torque specified by the bolt manufacturer. D. E.
