This article is about Thrust Block Installation, Design, Technical Specification, Checklist of Plumbing System as per international codes and standards.
Thrust Block Installation | Design | Technical Specification | Checklist
- Thrust blocks shall be placed at every change in direction with the following exception:
1-Thrust blocks may not be required for 100 mm nominal pipe size and smaller piping with restrained joints.
2- Thrust blocks may not be necessary for piping in gravity flow” - If thrust block is required a thrust resistance shall be provided prior to hydrostatic testing.
Note: Contractor may choose to place concrete thrust blocks before hydrotest at the risk of having to remove and replace any thrust blocks on leaking components.” - Thrust blocks shall not cover thermoplastic and RTR piping joints.
- Plastic pipes such as PVC, UPVC, CPVC, RTRP, HDPE, PP etc shall be protected from contact with concrete by tape wrapping. Use SAMS stock number for tape wrap 09-966-251/254/257 or equivalent
- Vibrators shall be kept clear of the piping while casting concrete thrust block
- At the edges where a thermoplastic or an RTR pipe or fitting enters or leaves a thrust block, it shall be wrapped with neoprene wrapping that will protrude slightly from the block. The thickness and the width of wrap shall comply with Table-4 of SAES-S-070 as shown below ê, unless the manufacturer requires more than one piece of wrapping.
Table 4-Neopreene Wrapping Requirements |
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| Thickness and Width of Tape Wrap for Various Operational Pressure (mm) | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| Nominal Pipe Size (mm) | Atmospheric | To 1600 kpa (230 psig) | Over 1600 kpa (230 psig) | |||||||||||||||||||||||||||||||||||||||||||||||||
| 400 and smaller | 12 x 150 mm | 12 x 150 mm | 24 x 250 mm | |||||||||||||||||||||||||||||||||||||||||||||||||
| 500-700 | 12 x 150 mm | 24 x 150 mm | 36 x 300 mm | |||||||||||||||||||||||||||||||||||||||||||||||||
| 800 and larger | 12 x 300 mm | 36 x 300 mm | 36 x 300 mm | |||||||||||||||||||||||||||||||||||||||||||||||||
International Codes and Standard References for Thrust Block Installation | Design
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