Thrust Blocks Clause Samples

The Thrust Blocks clause defines the requirements for installing structural supports that counteract the forces generated by fluid pressure in pipelines, particularly at bends, tees, or dead ends. In practice, this clause specifies the materials, dimensions, and placement of concrete or other suitable blocks to ensure that pipes remain securely anchored during operation. By mandating proper installation of thrust blocks, the clause prevents pipe movement or joint separation, thereby maintaining system integrity and safety.
Thrust Blocks. A. All Portland cement concrete shall conform to the provisions of Section 201 of the SSPWC except as herein modified. B. Portland cement concrete shall be composed of Portland cement, fine aggregate, coarse aggregate, and water proportioned and mixed to produce a smooth dense workable mixture. It can be of the ready-mix variety as produced by any reliable ready-mix concrete firm. C. Portland cement, including Portland cement used in precast products, shall be Type V conforming to ASTM C 150. D. Concrete for thrust blocks shall conform to 560-C-3250 per the SSPWC.
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Thrust Blocks. A. Concrete thrust blocks shall be provided where necessary to resist system pressure, including at all direction changes, size changes, valves and terminations or at any other points of the system that will result in an unbalanced thrust line for equipment 2-1/2” and larger and as indicated on the Drawings. Thrust blocks shall not obstruct the outlets of fittings which are intended for future connections. Thrust blocks shall be poured against undisturbed earth and in accordance with the Drawings.
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Thrust Blocks. All tees, reducers, bends and crosses shall be anchored to prevent movement by providing suitable concrete thrust blocking as shown on the drawings and specified herein, or required by the Engineer. Thrust blocking is required only at vertical to horizontal transitions (pumphouse risers) or where foundation soils are very compressible. Blocking shall be placed between solid undisturbed ground and the fitting to be anchored. The area of bearing on the undisturbed ground in each instance shall be as shown on the drawings. The blocking shall be so placed that the fitting joints will be accessible for repair.
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Thrust Blocks. Unless otherwise ordered by the Engineer, concrete Class 25/19 MPa thrust blocks shall be cast as a support for bends, tees and caps and at valves. The size of the thrust will depend on the strength of the soil, the pipe diameter, the working pressure and the type of item to be supported.
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Thrust Blocks. 1. Use thrust blocks for fittings on pipe greater than or equal to 3-inch diameter or any diameter rubber gasketed pipe. 2. Use 3,000-PSI concrete. 3. Use 2-mil plastic. 4. Use No. 4 Rebar wrapped or painted with asphalt tar based mastic coating.
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