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The most common type of restraint is that which rigidly resists weight; in other words it only acts against the downward movement of the pipe. Because it is the most common type, it merits two names — hanger and support. A hanger is specifically a rigid restraint, resisting only downward pipe movement, with a point of attachment above the pipe, that is, using a rod hanger assembly of some type. Typical hangers are shown in Figure 3-98. These are coded in CAESAR II as +Y restraints (where - or + preceding the restraint direction indicates one-way restraint), indicating that the restraint acts in the +Y direction against the pipe. Since the pipe has no structure to rub against, friction is not modeled.

Hanger design in caesar ii by meena rezkallah, p.eng., the best piping stress engineer & professional engineer in calgary alberta canada. pipe stress analysis services. meena development ltd.

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