Mexico's national water commission Conagua has issued three new guidelines revising standards for pipelines used in sanitary drainage, the agency said in a statement.
The new guidelines revise and update the NOM 001-CNA standards issued by the agency in 1995. These standards laid out the air tightness requirements for sewage pipes in order to avoid contamination of land and aquifers.
Two of the three revisions deal with specifications for PVC tubes used in gravity conduction systems. They are NMX-E-229-SCFI-1999 and PROY-NMX-E-230-CNCP-2006.
A third revision, PROY-NMX-E-241-SCFI-2002, deals with specifications for corrugated tubes made from high-density polyethylene (HDPE).
Conagua submitted the new norms on November 28 to a committee that included pipe manufacturers, construction firms, water and waste treatment utilities as well as government and higher education officials.
The committee approved the revisions, which Conagua must now offer under a 60-day public consultation process before publishing in the federal government's official bulletin to officially enact them.