Important Notice: Our web hosting provider recently started charging us for additional visits, which was unexpected. In response, we're seeking donations. Depending on the situation, we may explore different monetization options for our Community and Expert Contributors. It's crucial to provide more returns for their expertise and offer more Expert Validated Answers or AI Validated Answers. Learn more about our hosting issue here.

Does the coating of a cement-mortar coated pipe have to be removed before drilling? What is the procedure for PE-coated pipes?

April 26, 2017Coated Coating Drilling pipe pipes procedure removed

0

Posted

Does the coating of a cement-mortar coated pipe have to be removed before drilling? What is the procedure for PE-coated pipes?

1 Answer

0

Posted

This is explained in detail in DVGW Guideline W333 Section 9.2.2: Cast-iron pipes that are coated with cement-mortar according to DIN 30672-2 have sufficient adherence and smoothness, as well as low mortar porosity. The cement-mortar coating should not be removed in this case. The cement-mortar coating that is applied to PE coatings, however, must be removed around the tapping valve because it does not seal on the PE surface.