Section 93.535. Periodic inspection and repair of previously lined tanks.

 

(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. The first inspection shall be conducted within the years specified in Table 93.535.

(b) This section applies whether or not cathodic protection has been added to the tank system.

Table 93.535
Year of Initial Required Lining Inspection - See PDF for table

(2)  Any complete or partial tank lining conducted anytime after the original tank lining was installed is considered a repair of the lining.

(3)  The owner shall notify the authorized agent or the department in writing at least 5 business days before having the inspection performed.

(4)  

(a) Tank lining inspections shall use one or more of the following methods:

1. Video camera in accordance with KWA.

2. Ultrasound tester.

3. Other method acceptable to the department.

(b) The use of the equipment to perform the inspection under par. (a) 2. and 3. shall be in accordance with national consensus standards.

(5)  The person performing the inspection shall be certified by the manufacturer of the inspection equipment and acceptable to the department.

(6)  

(a) The person performing the inspection shall ascertain that the tank has been adequately emptied and cleaned to allow for a complete inspection of the tank.

(b) The authorized agent or the department may not accept an inspection that does not include all interior portions of the tank.

(7)  The person performing the inspection shall provide a report to the owner and to the 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.

(8)  A previously lined tank that is repaired to more than 10 percent of the lined surface may be returned to service only if all of the following conditions are met:

(a) The tank meets the structural requirements for lining when tested in accordance with API 1631 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)  Prior to 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) . The tightness test shall test 100 percent of the tank's volume.

CR 07-029 : cr. Register November 2008 No. 635 , eff. 2-1-09; CR 09-017 : cr. (9) Register July 2009 No. 643 , eff. 8-1-09; correction in (1) (a), (8) (b), (9) (b) made under s. 13.92 (4) (b) 7. , Stats., Register December 2011 No. 672 ; corrections in (1) (a), (8) (b), (9) (b) made under s. 13.92 (4) (b) 7. , Stats., Register October 2013 No. 694 ; CR 16-012 : am. (7) (intro.) Register August 2016 No. 728 , eff. 9-1-16.