Current through 2024-38, September 18, 2024
A.
Construction Materials
(1) All underground piping, including all
piping connectors, shall be constructed of fiberglass, cathodically protected
steel or other non-corrosive materials which may be approved by the
Department.
(2) All piping
materials including adhesives must be chemically compatible with the hazardous
substance to be stored.
(3) All
nonmetallic piping shall be approved and constructed in accordance with the
standards contained in the following:
Underwriters Laboratories (UL) Subject 971, "UL Listed
Non-metal Pipe";
Underwriters Laboratories (UL) Standard 567, "Pipe Connectors
for Flammable and Combustible and LP Gas";
Underwriters Laboratories of Canada (ULC) Guide ULC-107,
"Glass Fiber Reinforced Plastic Pipe and Fittings for Flammable Liquids";
or
Underwriters Laboratories of Canada (ULC) Standard
CAN4-S633-M84, "Flexible Underground Hose Connectors".
(4) All cathodically protected steel piping
shall be constructed and installed in conformance with the National Association
of Corrosion Engineers, Recommended Practices, Publication Number
RP-02-85.
B.
Secondary Containment
(1) All
underground piping systems for underground hazardous substance storage
facilities shall be constructed of double wall piping such that the outer wall
completely encloses the inner wall to provide 360 degree double wall protection
that will completely contain hazardous substance leaks.
(2) A leak detection system for all piping
shall be installed in accordance with the requirements of Section 8 and 9 of
this rule.
C.
Installation
(1) Underground piping
shall be installed in conformance with the requirements contained in Appendix
E.
(2) Underground piping shall be
installed in accordance with manufacturer's instructions and
recommendations.
(3)
Repealed.
(4) Underground piping
may only be installed by an underground hazardous substance storage tank
installer certified by the Maine Board of Underground Storage Tank Installers
(BUSTI) under 32 MRSA §10001 et seq., or by a BUSTI-certified underground
oil storage tank installer if supervised on-site by a registered Maine
professional engineer with training and experience in underground storage
facility installation.
D.
Relining and Reinstallation
Underground piping-may not be relined or reinstalled.
E.
Repair After a
Leak
(1) Repair of underground piping
and metal parts of ancillary equipment shall not be allowed. Piping sections
and metal parts of ancillary equipment which leak must be replaced.
(2) The entire leaking underground piping
system must be replaced if a leak is detected in a piping system which does not
conform to the requirements of this regulation.
