Current through August 26, 2024
(1)
(a) The owner of a lined tank shall obtain an
internal inspection of the tank lining within 5 years after the date of initial
tank lining, or repair to a previously installed tank lining, and at least
every 5 years thereafter.
(b) This
section applies whether or not cathodic protection has been added to the tank
system.
(2) Any complete
or partial tank lining conducted any time after the original tank lining was
installed is considered a repair of the lining.
(3) The owner shall notify the authorized
agent and the department in writing at least 5 business days before having the
inspection performed.
(3m) Before
commencing any inspection, the underground tank system liner shall ensure that
the tank is prepared for inspection in accordance with API 1631.
(4) Tank lining inspections shall use one of
the following methods:
(a) Video camera
inspection in accordance with KWA Method A only. A pre-inspection tightness
test shall be performed in accordance with s.
ATCP 93.510(4); if the tank fails the
tightness test, video inspection is not permitted.
(b) Physical inspection in accordance with
API 1631.
(5) Inspection
requirements are as follows:
(a) For tanks
with lining and cathodic protection added at the same time, if cathodic
protection has been maintained at a protective level:
1. Video inspection as prescribed under sub.
(4) (a).
2. Physical inspection as
prescribed under sub. (4) (b).
(b) For tanks with cathodic protection added
after the tank was lined:
1. For first 5-year
inspection following cathodic protection addition with cathodic protection
maintained at a protective level, physical inspection is required under sub.
(4) (b).
2. If first 5-year
inspection indicates no change of external wall thickness, then subsequent
5-year inspections can be performed as allowed in sub. (4).
(c) For lined tanks without
cathodic protection installed, physical inspection is required under sub. (4)
(b).
(d) The use of the equipment
to perform the inspections under par. (a) shall be in accordance with national
consensus standards.
(e) Inspection
and repairs of lined tanks shall be conducted by or under the direct
supervision of an underground tank system liner in accordance with s.
ATCP 93.240(1)
(b).
(f) The person performing the inspection
shall be certified by the manufacturer of the inspection equipment.
(g) An inspection shall include all interior
portions of the tank.
(7) Repair of tank linings shall comply with
the requirements of API 1631 and the lining manufacturer's
specifications.
(7g) Tanks that
have an overall average tank metal thickness or an average tank thickness of a
designated thin wall area of less than 75 percent or any through-wall
perforations shall be immediately closed per s.
ATCP 93.560.
(7r) Tanks that have an overall average tank
metal thickness or an average tank thickness of a designated thin wall area of
75 percent to 85 percent shall have an impressed current system installed per
s.
ATCP 93.520 or be immediately closed per s.
ATCP 93.560.
(8) A lined tank that requires repairs to
more than 10 percent of the lined surface shall be returned to service only if
all of the following conditions are met:
(a)
The tank meets the structural requirements in subs. (7), (7g), and (7r) before
the lining repair.
(b) The tank has
impressed current corrosion protection installed in accordance with s.
ATCP 93.520 before being placed back into
service.
(9) The person
performing the inspection shall provide a report to the owner, authorized
agent, and the department within 15 days of completing the inspection that
describes all of the following items in addition to those required in API 1631:
(a) The type of repairs that have been
made.
(b) The total dimension of
the area in square inches that has been repaired by lining.
(c) A schematic drawing of the tank showing
the area of repairs.
(10)
Before placing any tank back into service under this section, both of the
following shall occur in the following order:
(a) An access way for an inspector to enter
the tank shall be installed from the tank interior to finished grade, if not
already provided.
(b) A precision
tightness test shall be performed on the tank system in accordance with s.
ATCP 93.515(4). In addition, tightness
test shall be performed on the ullage portion of the tank in accordance with s.
ATCP 93.515(10).
