National Grid must be made aware of this and be reminded that they must satisfy themselves whether or not thrust blocks
are required at these locations.
In the test program, ends of the stringers were notched and thrust blocks
"The ongoing work comprises laying of 52km steel and uPVC pipes and construction of chambers for all meters, valves, air valves, fire hydrants and thrust blocks
on the bend," he said.
This made pouring concrete thrust blocks
for the beds and fittings (as dune with gasketed or mechanical joint pipe) almost impossible, as the concrete would eventually migrate downward due to the lack of solid virgin ground.
Thrust restraint for pressure systems can be provided by thrust blocks
or mechanical joint restraints.