Current through 2024-38, September 18, 2024
A.All new and
replacement underground hazardous substance storage facilities, including
piping, must include a leak detection system operating between the inner and
outer walls of the tanks and piping. In addition, pressurized piping systems
must include a line leak detector that meets the requirements of Section 8C.
B.All leak detection systems must
meet the following requirements an a minimum:
(1) All leak detection systems at all
facilities must be capable of detecting a leak from any portion of the inner
tank or piping;
(2) All leak
detection systems must be designed, installed, calibrated, operated, and
maintained in accordance with the manufacturer's instructions and
recommendations including routine maintenance and service checks for
operability or running condition;
(3) All leak detection systems must have a
probability of leak detection of .95 or greater and a probability of false
alarm of .05 or less;
(4) A product
tight and water tight non corrosive, product-compatible manway that provides
visual access shall enclose any pump, leak detection, or ancillary equipment
that contains product outside of the double wall tank or piping system;
and
(5) Monitoring methods for
tracer substances or substances other than the specific hazardous substance or
substances stored must be approved by the Department.
NOTE: Electronic or manual, vapor or free product detection
methods that meet the requirements of this section are acceptable.
C.
Additional
Leak Detection Requirements for Piping Systems
(1) Suction pump piping systems must include
a single check valve located immediately upstream from the pump such that a
leak in any portion of the below ground piping will prevent the pump from
operating properly thus alerting the owner or operator that a leak may be
present.
(2) Pressurized piping
systems must include both a line leak detector capable of detecting a leak at 3
gallons per hour at 10 pounds per square inch line pressure within 5 minutes,
and a continuous leak detection system in the interstitial space. Systems that
combine line leak detection and interstitial space monitoring are acceptable.
In addition, the line leak detector must incorporate one of the following:
(a) An automatic shut off device;
(b) A flow restriction device; or
(c) An alarm that indicates a leak.
(3) Line leak detectors shall be
tested annually to be sure that they are operating properly. If a leak detector
in not operating properly the facility shall cease operations until the leak
detector is repaired or replaced.
D.All written performance claims pertaining
to any release detection system used at the facility, and the manner in which
these claims have been justified or tested by the equipment manufacturer or
installer, shall be maintained at the facility or at the owner or operators
place of business and shall be made available to Department employees or local
public safety officer upon request.
