(NOTE: The following codes of practice may be used to comply with this section: NACE International Standard Practice SP 0285, "External Control of Underground Storage Tank Systems by Cathodic Protection"; NACE International Standard Practice SP 0169, "Control of External Corrosion on Underground or Submerged Metallic Piping Systems"; National Leak Prevention Association Standard 631, Chapter C, "Internal Inspection of Steel Tanks for Retrofit of Cathodic Protection"; or American Society for Testing and Materials Standard G158, "Standard Guide for Three Methods of Assessing Buried Steel Tanks".)
Maximum Leak Detection Rate Per Test Section Volume | ||
Test Section Volume (Gallons) | Semiannual Test - Leak Detection Rate Not To Exceed (Gallons Per Hour) | Annual Test - Leak Detection Rate Not To Exceed (Gallons Per Hour) |
<50,000 | 1.0 | 0.5 |
>50,000 to < 75,000 | 4.5 | 0.75 |
>75,000 to < 100,000 | 2.0 | 1.0 |
>100,000 | 3.0 | 1.5 |
Piping segment volumes greater than or equal to one hundred thousand gallons not capable of meeting the maximum three gallon per hour leak rate for the semiannual test may be tested at a leak rate up to six gallons per hour according to the following schedule:
Phase-In For Piping Segments > 100,000 Gallons In Volume | |
First test | Not later than April 1, 2021, (may use up to 6.0 gph leak rate) |
Second test | Between April 1, 2021, and April 1, 2024, (may use up to 6.0 gph leak rate) |
Third test | Between April 1, 2024, and April 1, 2025, (must use 3.0 gph for leak rate) |
Subsequent tests | After April 1, 2025, begin using semiannual or annual line testing according to the Maximum Leak Detection Rate Per Test Section Volume table above |
N.D. Admin Code 33-24-08-72
General Authority: NDCC 23-20.3-03, 23-20.3-04.1
Law Implemented: NDCC 23-20.3-04.1