Section Env-Or 305.05 - Additional Requirements Specific to Underground Piping(a) Underground piping systems installed on or after April 25, 1997 shall be designed, constructed, and installed with access and isolation points that allow independent pressure testing of piping without the need for excavation.(b) All components of an underground piping system installed on or after April 25, 1997 shall: (1) Have secondary containment as specified in (f), below, and Env-Or 305.07; and(2) Be constructed of fiberglass reinforced epoxy, flexible thermoplastic extrusions, carbon steel, stainless steel, galvanized steel, or type K annealed copper tubing that meets the applicable standards listed in (c) through (g), below.(c) Fiberglass reinforced epoxy piping shall be certified by its manufacturer as meeting ASTM Specification D-2996-01, Standard Specification for Filament Wound Fiberglass Pipe, and UL Subject 971, "Non-Metallic Underground Piping for Flammable Liquids". Ultimate sheer strength of adhesive and curing agent shall be as specified in ASTM D-2517-05, as approved and supplied by the manufacturer.(d) Thermoplastic extrusion flexible piping shall be certified by its manufacturer as meeting UL Standard for Non-Metallic Underground Piping for Flammable Liquids, Subject 971.(e) Steel piping installed on or after April 25, 1997 shall: (1) Be carbon steel, stainless steel, or have a galvanized coating if the galvanization is compatible with the oil stored;(2) Be schedule 40 or heavier; and(3) Be installed as specified in API 1615.(f) If the secondary containment for steel piping is metal, it shall: (1) Have a protective wrapping or di-electric coating; and(2) Be cathodically protected by an impressed current system or sacrificial anode system.(g) Type K annealed copper tubing shall be used only as allowed by Env-Or 305.04(k).N.H. Admin. Code § Env-Or 305.05
(See Revision Note at chapter heading for Env-Or 300) #10487, eff 2-7-14