Rubber expansion joint tools

Where transverse forces are to be kept to a minimum, chain or cable assemblies should be substituted for the rigid control rods. While spherical seats on the control rods are of some value, the force required to move piping laterally when control rods are used, remains very high. All pipes are to be lined up accurately before installing expansion joints. Although rubber units will adjust themselves to misaligned flanges within the specified limits, it is difficult to force expansion joints into position before they are rigidly bolted to the flanges.

Expansion joint flanges must be in contact with a continuous surface. Depressions or protrusions typical of victaulic or similar flanges must be covered with a steel cover flange first.

Rubber flanges will not retain loose elements in valve bodies that rely on contact with a steel flange. A steel cover flange must be inserted between the rubber expansion joint and the valve body. Apply a thin film of graphite dispersed in glycerin or water to the face of the rubber flanges before installing. No other type of lubricant or seal should be used on the flange face.

The graphite prevents the rubber from adhering to the metal flange so that the rubber pipe or joint can be removed without damage, should it ever be necessary.

Bolts should be tightened by alternating around the flange and all tightened equally. Slight gouges or abraded areas caused by tools or bolts during installation should be sealed with rubber cement and painted to prevent deterioration of the carcass.

Bolt tightness should be checked one week after going on stream and checked periodically thereafter. Joints installed outdoors should have neoprene cover. If system is not anchored to insure against movement beyond maximum stated limits control units must be used.

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Variable load. Constant load. Piping elements. Sparking tools. Titan tools. Plastic pipes for aqueducts, gas pipelines, sewers and other similar uses find a wide range of installations. Compared to normal steel pipes, plastic pipes have a very high thermal expansion coefficient. The problem of thermal expansion of the tube arises in long length straight pipes, which in many cases can reach high values.