Underground steel storage tanks are intended for use for a variety of industries but are most used for petroleum which is mostly found in gasoline stations. The quality control standards set for underground steel tanks are more strictly enforced to prevent contamination of the groundwater.
InTouch employs the most recent international standards in developing its underground steel storage tank inspection and quality control protocols. The following are a few of the most current international standards for underground steel storage tanks:
API 1604
The API 1604 covers procedures to look into the closure of underground petroleum storage tanks with regards to place, removal, storage and off-site disposal of underground storage tank systems which have contained flammable or combustible fluids.
UL 58
The UL 58 standard covers single-wall and double-wall bare steel underground tanks wherein leakage, buckling from external pressure and venting is addressed. It originally identified the minimum thickness of the steel based on the tank diameter and length.
UL 443
The standard covers the design and construction of welded atmospheric-type steel auxiliary tanks which have been intended for auxiliary storage and supply of fuel oil for oil burners. Such tanks are for use in the supply piping between a burner and its main fuel supply tank.
UL 1746
The standard covers the requirements for the external corrosion protection systems of steel underground storage tanks. It consists of three types of protection systems which include cathodically protected tanks, composite tanks, and jacketed tanks. Base tanks are to be constructed in accordance with UL 58 while more corrosive protection is added in order to provide further safety.
API 1631
The standard covers minimum recommendations with regards to the interior lining of existing steel underground tanks which are being used to store petroleum-based motor fuels and middle distillates to ensure proper interior lining is followed by contractors, mechanics and engineers.
ASTM G 158
The standard covers the procedures which are to be implemented prior to the application of cathodic protection in order to evaluate the suitability of a tank for upgrading by cathodic protection alone. It consists of three procedures which are the needed to ensure proper quality control standards.
NFPA 326
The standard is applied to ensure safeguarding of tanks or containers which operate under nominal atmospheric pressure conditions which contain or have previously contained flammable and combustible liquids or other hazardous substances and related vapors or residues to ensure that no environmental damage is produced from these tanks by proper entry, cleaning, and/or repair.
