Section 250-RICR-140-25-2.11 - Repairing and Reconditioning of ASTsA. Permanent repairs; All repairs must be permanent in nature and equal to or better than the standards of original construction.B. All welds associated with the repair of an AST must be inspected and tested for tightness before the AST is returned to service.C. Linings, coatings, grouts and other sealing materials which are chemically compatible with the oil product being stored may be used in conjunction with a permanent steel AST repair as outlined above, but by themselves are not acceptable permanent repairs.D. Cleaning of tank prior to repair; Prior to repair, an AST must be cleaned in accordance with generally accepted practices. Sludge which has accumulated on the bottom of the AST must be removed, transported and disposed of in a manner consistent with all applicable State and Federal requirements for solid waste disposal.E. Coating (lining) specifications; Any non-corrodible epoxy-based resins, isophthalic polyester-based resins or equivalent coating which is bonded firmly to the interior surfaces may be used as a coating to protect an AST from future corrosion. 1. The coating must be applied as soon as possible, but not later than eight (8) hours after sandblasting and cleaning of the internal surface. Visible rust, moisture or foreign matter must not be present.2. The coating must be of sufficient thickness, density and strength to form a hard-impermeable shell which will not crack, soften or separate from the interior surface of the AST. The coating when applied to properly prepared steel must maintain a permanent bond to the AST.3. The coating's coefficient of thermal expansion must be compatible with steel so that stress due to temperature changes will not be detrimental to the soundness of the coating.4. The coating must be chemically compatible with oil products and product additives.5. The coating material must be applied and cured in strict accord with manufacturer's specifications.6. Coatings used to protect the bottom of the AST must extend up the side of the AST a minimum of eighteen inches (18").7. Inspection of coating; The coating must be checked for blisters, air pockets and electrically tested for pinholes. The coating thickness must be checked assure compliance with manufacturer's specifications. Any defects must be repaired.8. Manufacturer's guarantee; An interior coating must be installed under the direction of the lining manufacturer or a certified representative. The manufacturer or representative must guarantee to the owner in writing that the coating will not leak the product specified in storage for the period specified in the coating product warranty. A copy of the guarantee must be kept by the owner for the life of the AST.250 R.I. Code R. 250-RICR-140-25-2.11
Amended effective 5/2/2018
Amended effective 7/20/2022