Alliance Engineering Company

Shukrawar Peth, Pune, Maharashtra

Welding Neck Flanges are designed to be butt welded to the pipe. The long tapered hub reinforces the flange, permits stress- relieving and removes the flange face from the heat affected zone. The form of welding neck flanges with conical neck sloping down from welding point to flange is most recommended to be employed in all the most severe fields with most dangerous fluids.

These flanges are recommended for their use in quick assembly, cost saving & in cases where extreme precision in length of pipe sections is not recommended.

These flanges, having their principle use when there is need of a quick assembly & disassembly of pipe sections with limited working pressure. They are put onto a flanged pipe or a flanged nozzle which is welded onto the pipe head. With the possibility of turning the flange keeping the flange still, they make assembly & disassembly of large sized pipes much easier, because the problem of alignment between holes for bolts is eliminated.

These flanges are usually used for special requirements. Their advantage is the possibility to work under considerably high temperatures & pressures.
Threaded Flanges are widely used because no welding equipment is required for assembly and both the pipe and flange can be completely salvaged upon dismantling. Accurately cut, clean, tapered pipe thread dimensioned to ANSI A2.1 Pipe threads assure strong, tight joints.

Normally used to stop one end of a flanged pipe or a valve orifice or the opening of pressure vessel

These flanges are substitute to slip-on flanges (particularly for small nominal diameters & for rather high working pressures) when a greater flow continuity is required without loss of force.

These flanges are used in pairs & between them; there is a disk with a calibrated hole to measure the flow of liquid at a certain point in a pipe. They have two radial holes situated at 180deg for the insertion of pressure gauges, which are usually stopped by threaded plugs.