| (A) Fittings. All metallic tank fittings (e.g., bung
hole plugs) shall be protected from corrosion and shall be either:
(i) isolated from the backfill material and groundwater
or any other water;
(ii) thoroughly coated with a suitable dielectric material,
in accordance with the tank manufacturer's specifications; or
(iii) cathodically protected in accordance with the
applicable provisions in §334.49(c) of this title.
(B) Striker plates. Factory-installed striker plates
shall be located on the interior bottom surface of each tank under
all fill and gauge openings.
(C) Dielectric bushings or fittings. In order to provide
electrical isolation of the tank from other connected metal components,
all coated steel tanks equipped with either a factory-installed cathodic
protection system or a factory-applied fiberglass-reinforced plastic
laminate or cladding shall also be fitted with dielectric bushings
or fittings at each tank opening where other metal UST system components
are connected, except for unused openings closed with metal plugs
and for openings where the connected component is non-metallic.
(c) Technical standards for new piping.
(1) Piping design and construction. All new underground
piping (including associated valves, fittings, and connectors) in
a UST system shall be properly designed, constructed, and protected
from corrosion in accordance with one of the methods listed in subparagraphs
(A) - (D) of this paragraph and in accordance with specific codes
and standards of practice developed by nationally recognized associations
and independent testing laboratories, as referenced in the following
subparagraphs.
(A) The piping may be constructed of fiberglass-reinforced
plastic. Piping constructed under this method shall meet the following
standards:
(i) UL Standard 971, "Standard for Nonmetallic
Underground Piping For Flammable Liquids;" and
(ii) ULC Standard S660, "Standard for Nonmetallic
Underground Piping for Flammable and Combustible Liquids."
(B) The piping may be constructed of coated steel.
Piping constructed under this method shall be thoroughly coated with
a suitable dielectric material, shall be cathodically protected with
a field-installed cathodic protection system meeting the appropriate
design and operational requirements in §334.49(c) of this title,
and shall meet the applicable provisions of the following standards.
(i) UL Standard 971A, "Outline of Investigation
for Metallic Underground Fuel Pipe;"
(ii) STI Recommended Practice R892, "Recommended
Practice for Corrosion Protection of Underground Piping Networks Associated
with Liquid Storage and Dispensing Systems;"
(iii) American Petroleum Institute Publication 1632, "Cathodic
Protection of Underground Storage Tanks and Piping Systems;"
(iv) NACE International Standard Practice SP0169, "Control
of External Corrosion on Underground or Submerged Metallic Piping
Systems; and"
(v) NACE International Standard Practice SP0285, "External
Corrosion Control of Underground Storage Tank Systems by Cathodic
Protection."
(C) The piping may be constructed of flexible nonmetallic
material. Piping constructed under this method shall meet the following
standards:
(i) UL Standard 971, "Standard for Nonmetallic
Underground Piping For Flammable Liquids;" and
(ii) ULC Standard S660, "Standard for Nonmetallic
Underground Piping for Flammable and Combustible Liquids."
(D) The piping may be designed, constructed, and protected
from corrosion by an alternate method which has been reviewed and
determined by the agency to prevent the release of any stored regulated
substance in a manner that is no less protective of human health and
the environment than the methods described in subparagraphs (A) and
(B) of this paragraph. Any alternative methods must be submitted and
approved in accordance with the procedures in §334.43 of this
title.
(2) Release detection for new piping. All new piping
shall be monitored for releases of regulated substances in accordance
with §334.50(b)(2) of this title.
(3) Other new piping components.
(A) For piping systems in which regulated substances
are conveyed under pressure to an aboveground dispensing unit, a UL-listed
(or agency accepted equivalent listing by ULC) emergency shut-off
valve (also called a shear or impact valve) shall be installed in
each pressurized delivery or product line and shall be securely anchored
at the base of the dispenser. This shut-off valve shall include a
fusible link, and shall be designed to provide a positive shut-off
of product flow in the event that a fire, collision, or other emergency
occurs at the dispenser end of the pressurized line.
(B) UL-listed (or agency accepted equivalent listing
by ULC, or Factory Mutual Research Corporation (FMRC)) flexible connectors
shall be installed at both ends of each pressurized product or delivery
line to provide flexibility and to allow for vertical and horizontal
movement in the piping, unless inherently flexible piping is installed
in accordance with manufacturer's requirements and in accordance with
an applicable code or standard of practice developed by a nationally
recognized association or independent testing laboratory. The use
of metal swing joints in a pressurized UST piping system is specifically
prohibited.
(C) If buried and in contact with soil or backfill
materials, all metallic pipe, valves, and fittings (including flexible
connectors) shall be equipped with corrosion protection meeting the
applicable requirements in §334.49 of this title.
(D) Only UL-listed (or agency accepted equivalent listing
by ULC, or FMRC) flexible connectors or nonmetallic piping listed
for aboveground use or listed for use in sumps can be used without
backfill cover in sumps, manways, or dispenser pans.
(d) Secondary containment for UST systems.
(1) Applicability.
(A) A secondary containment system meeting the requirements
of this subsection shall be installed as part of any hazardous substance
UST system.
(B) A double-wall tank and piping system (or approved
alternative) meeting the applicable requirements of this subchapter
shall be installed for any UST system situated on the Edwards Aquifer
recharge or transition zones or contributing zone within the transition
zone, in accordance with Chapter 213 of this title (relating to Edwards
Aquifer).
(C) A UST system, at a minimum, shall incorporate secondary
containment as specified in Texas Water Code, §26.3476, if the
UST system is located in an area described in that provision.
(D) The agency may specifically require the installation
of a secondary containment system meeting the requirements of this
subsection at other times when necessary for the protection of human
health or safety or the environment.
(E) Requirements applicable to new tanks, piping and/or
dispensers (including related sumps or manways) installed on or after
January 1, 2009:
(i) Any new tank or piping installed as part of a UST
system must incorporate secondary containment in accordance with the
applicable requirements of this subchapter, except that external liners
will not be allowed as a secondary containment method.
(ii) Up to 35% of the total original length of an existing
single-wall piping can be replaced with new single-wall piping in
accordance with the applicable requirements of this subchapter without
triggering the secondary containment requirement for that piping,
unless the new piping segment connects the existing piping to a new
dispenser. If more than 35% of the total original length of an existing
single-wall piping is to be replaced, or the new piping segment connects
the existing piping to a new dispenser, that piping segment must be
replaced with a piping which incorporates secondary containment.
(iii) The interstice of the secondarily contained tank
and/or piping must be monitored in accordance with the requirements
of §334.50(d)(7) of this title.
(iv) Any sumps (including dispenser sumps) or manways
which are used for interstitial monitoring of piping must be compatible
with the stored substance(s), must be installed and maintained in
a manner that assures that their sides, bottoms, and any penetration
points are liquid tight, and must be inspected in accordance with
the requirements in §334.42 and §334.48 of this title (relating
to General Standards; and General Operating and Management Requirements).
Cont'd... |
