Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 140 - Waste and Materials Management › Subchapter 25 - Oil and Underground Tanks › Part 2 - Oil Pollution Control Regulations (250-RICR-140-25-2) › Section 250-RICR-140-25-2.11 - Repairing and Reconditioning of ASTs

Current through June 14, 2024
A. 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.