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Once again, not answering the original question, but probably of interest to many of you is the potential effect on PVCu casing of the heat of hydration of thick areas of cement grout (e.g. washouts) when it is curing around the pipe. Apparently this has been know to cause the pipe to deform (see page 28 in the excellent booklet 'Water Supply Guidelines for use in developing Countries' https://www.seidc.com/pdf/WATER_SUPPLY_WELL_GUIDELINES-third_edition.PDF_CP1.pdf). The same document provides good advice on sealant materials for the annular space around the permanent casing and diagrams of typical details.

Regards,

Brian Brian Skinner WEDC

Once again, not answering the original question, but probably of interest to many of you is the potential effect on PVCu casing of the heat of hydration of thick areas of cement grout (e.g. washouts) when it is curing around the pipe. Apparently this has been know to cause the pipe to deform (see page 28 in the excellent booklet 'Water Water Supply Guidelines for use in developing Countries' https://www.seidc.com/pdf/WATER_SUPPLY_WELL_GUIDELINES-third_edition.PDF_CP1.pdf). Countries ). The same document provides good advice on sealant materials for the annular space around the permanent casing and diagrams of typical details.

Regards,

Brian Brian Skinner Skinner

WEDC