High Pressure Pipe Couplings
Pipe clamps and hubs are a safe, easy and economical way of joining high pressure pipes compared with traditional flanges.
A pair of clamps with a tapered recess machined into them fit over tapered hubs which are welded onto the ends of the pipe. A firm, but elastic seal ring fits into grooves machined in the faces of the hub and provide an alignment spigot for assembly and an effective seal. The clamps are pullet together with either two or four bolts.
The 15 degree taper of the hubs is sufficiently large to make initial fitting and tightening easy.
50 to 100NB clamps are held together by 2-bolts and nuts while 150 to 300NB clamps are pulled up with 4 studs with self-aligning nuts. These clamps are all ANSI class 1500 (MPa) rated. All the fasteners are low tensile (grade 4.6), galvanized and have generous corrosion allowances.
An earlier range of two bolt clamps is also available for low pressure applications (ANSI class 900 and below – 16MPa).
The hubs are made of wrought steel with guaranteed properties and are factory welded onto the pipes. The weld is as simple as a normal butt weld done by code welders to a controlled standard.
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