- Vitrified clay pipe
Vitrified clay pipe (VCP) is pipe made from
claythat has been subjected to vitrification, a process which fuses the clay particles to a very hard, inert, glass-like state. VCP is commonly used in sewergravity collection mains because of its reasonable price and resistance to almost all domestic and industrial sewage, particularly the sulfuric acidthat is generated by hydrogen sulfide, a common component of sewage. Only hydrofluoric acidand highly-concentrated causticwastes are known to attack VCP. Such wastes would not be permitted to be discharged into a municipal sewage collection system without adequate pretreatment. [ [http://cfpub.epa.gov/npdes/home.cfm?program_id=3 EPA Pretreatment Program - Office of Wastewater Management ] ]
[http://www.ncpi.org/ National Clay Pipe Institute] - a not-for-profit trade association comprised of the manufacturers of vitrified clay pipe.
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