27. Thrust Restraint Design for Buried Piping.

Part Three, Section 27. Thrust Restraint Design for Buried Piping COMMON Design GUIDELINES 2008 27. Thrust Restraint Design for Buried Piping. a. General. 1) This section presents the Design methodology to be used when providing Thrust Restraint for Buried pressurized piping. It includes guidelines for the Design of Thrust blocking using the standard details and special Design requirements for non-standard Thrust blocks and restrained joint pipe. 2) For pipe sizes larger than 24-inch, consider the cost of using one of the approved restrained joints or providing concrete Thrust blocking to restrain the pipe or fitting. If the cost is approximately equal , Design for concrete Thrust blocks and if the restrained joints are considerably less expensive, then Design for restrained joints unless otherwise directed.

The design thrust force for reducers is equal to the design pressure (P) times the difference of the cross sectional areas of the large (Al) and small end (As) sizes of the reducer. F = P (Al − As) e) Appropriate earth pressure theories to be used when designing thrust blocks. (1) Horizontal bends, reducers, tees, TS&V, TA&V, plugs and caps.

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