Is a Thrust Block Required on a Straight Coupling?

1/7/2020

For straight pipe couplings, are thrust blocks required, or is it only at any change of direction in the piping? It seems as though restrained joints seem to be common now, but the question came up when using thrust blocks instead of the restrained joints.

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2 Comments

Wayne Ammons

1/7/2020 07:56:09 am

See below from NFPA 13, 2013 Edition. I am not aware of a requirement for thrust blocks on straight-through runs of underground pipe or if additional considerations should be made for very old underground pipe.

10.8.1.1* All tees, plugs, caps, bends, reducers, valves, and hydrant branches shall be restrained against movement by using thrust blocks in accordance with 10.8.2 or restrained joint systems in accordance with 10.8.3.

A.10.8.1.1 It is a fundamental design principle of fluid mechanics that dynamic and static pressures, acting at changes in size or direction of a pipe, produce unbalanced thrust forces at locations such as bends, tees, wyes, dead ends, and reducer offsets. This design principle includes consideration of lateral soil pressure and pipe/soil friction, variables that can be reliably determined using current soil engineering knowledge. Refer to A.10.8.3 for a list of references for use in calculating and determining joint restraint systems.

sean

1/7/2020 10:10:08 am

it has to have the proper base but no thrust as no change in flow dynamics will occure

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