South Carolina Code of Regulations
Chapter 38 - DEPARTMENT OF PUBLIC SAFETY
Article 5 - STATE TRANSPORT POLICE REGULATIONS
Subarticle 1 - UNMANUFACTURED FOREST PRODUCTS TRUCKING REGULATIONS
Part 38-393 - PARTS AND ACCESSORIES NECESSARY FOR SAFE OPERATION
Subpart E - FUEL SYSTEMS
Section 38-393.67 - Liquid fuel tanks

Universal Citation: SC Code Regs 38-393.67

Current through Register Vol. 48, No. 9, September 27, 2024

(a) Application of the rules.

(1) A liquid fuel tank manufactured on or after January 1, 1973, and a side mounted gasoline tank must conform to all the rules.

(2) [Reserved]

(3) A diesel fuel tank manufactured before January 1, 1973, and mounted on a vehicle must conform to the rules in paragraph (c)(7)(iii) Reserved

(4) [FN*]

(5) A gasoline tank, other than a side mounted gasoline tank, manufactured before January 1, 1973, and mounted on a vehicle must conform to the rules in paragraphs (c) (1) through (10), inclusive.

(6) Private motor carrier of passengers. Motor carriers engaged in the private transportation of passengers may continue to operate a commercial motor vehicle which was not subject to 38-393 or 49 CFR 571.301 at the time of its manufacture, provided the fuel tank of such vehicle is maintained to the original manufacturer's standards.

(b) Definitions. As used in 38-393

(1) The term liquid fuel tank means a fuel tank designed to contain a fuel that is liquid at normal atmospheric pressures and temperatures.

(2) A side mounted fuel tank is a liquid fuel tank which

(i) If mounted on a truck tractor, extends outboard of the vehicle frame and outside of the plan view outline of the cab; or

(ii) If mounted on a truck, extends outboard of a line parallel to the longitudinal centerline of the truck and tangent to the outboard side of a front tire in a straight ahead position. In determining whether a fuel tank on a truck or truck tractor is side mounted, the fill pipe is not considered a part of the tank.

(1) Joints. Joints of a fuel tank body must be closed by arc, gas, seam, or spot welding, by brazing, by silver soldering, or by techniques which provide heat resistance and mechanical securement at least equal to those specifically named. Joints must not be closed solely by crimping or by soldering with a lead based or other soft solder.

(2) Fittings. The fuel tank body must have flanges or spuds suitable for the installation of all fittings.

(3) Threads. The threads of all fittings must be Dryseal American Standard Taper Pipe Thread or Dryseal SAE Short Taper Pipe Thread, specified in Society of Automotive Engineers Standard J476, as contained in the 1971 edition of the "SAE Handbook," except that straight (nontapered) threads may be used on fittings having integral flanges and using gaskets for sealing. At least four full threads must be in engagement in each fitting.

(4) Drains and bottom fittings.

(i) Drains or other bottom fittings must not extend more than three fourths of an inch below the lowest part of the fuel tank or sump.

(ii) Drains or other bottom fittings must be protected against damage from impact.

(iii) If a fuel tank has drains the drain fittings must permit substantially complete drainage of the tank.

(iv) Drains or other bottom fittings must be installed in a flange or spud designed to accommodate it.

(5) Fuel withdrawal fittings. Except for diesel fuel tanks, the fittings through which fuel is withdrawn from a fuel tank must be located above the normal level of fuel in the tank when the tank is full.

(6) [Reserved]

(7) Fill pipe.

(i) Each fill pipe must be designed and constructed to minimize the risk of fuel spillage during fueling operations and when the vehicle is involved in a crash.

(ii) The fill pipe and vents of a fuel tank having a capacity of more than 25 gallons of fuel must permit filling the tank with fuel at a rate of at least 20 gallons per minute without fuel spillage.

(iii) Each fill pipe must be fitted with a cap that can be fastened securely over the opening in the fill pipe. Screw threads or a bayonet type joint are methods of conforming to the requirements of this subdivision.

(8) Safety venting system. A liquid fuel tank with a capacity of more than 25 gallons of fuel must have a venting system which, in the event the tank is subjected to fire, will prevent internal tank pressure from rupturing the tank's body, seams, or bottom opening (if any).

(9) Pressure resistance. The body and fittings of a liquid fuel tank with a capacity of more than 25 gallons of fuel must be capable of withstanding an internal hydrostatic pressure equal to 150 percent of the maximum internal pressure reached in the tank during the safety venting systems test specified in paragraph (d)(1).

(10) Air vent. Each fuel tank must be equipped with a nonspill air vent (such as a ball check). The air vent may be combined with the fill pipe cap or safety vent, or it may be a separate unit installed on the fuel tank.

(11) Markings. If the body of a fuel tank is readily visible when the tank is installed on the vehicle, the tank must be plainly marked with its liquid capacity. The tank must also be plainly marked with a warning against filling it to more than 95 percent of its liquid capacity.

(12) Overfill restriction. A liquid fuel tank manufactured on or after January 1, 1973, must be designed and constructed so that

(i) The tank cannot be filled, in a normal filling operation, with a quantity of fuel that exceeds 95 percent of the tank's liquid capacity; and

(ii) When the tank is filled, normal expansion of the fuel will not cause fuel spillage.

(d) Liquid fuel tank tests. Each liquid fuel tank must be capable of passing the tests specified in paragraphs (d) (1) and (2). [FN1]

(1) Safety venting system test

(i) Procedure. Fill the tank three fourths full with fuel, seal the fuel feed outlet, and invert the tank. When the fuel temperature is between 50 deg. F. and 80 deg. F., apply an enveloping flame to the tank so that the temperature of the fuel rises at a rate of not less than 6 deg. F. and not more than 8 deg. F. per minute.

(ii) Required performance. The safety venting system required by paragraph (c)(8) activate before the internal pressure in the tank exceeds 50 pounds per square inch, gauge, and the internal pressure must not thereafter exceed the pressure at which the system activated by more than five pounds per square inch despite any further increase in the temperature of the fuel.

(2) Leakage test

(i) Procedure. Fill the tank to capacity with fuel having a temperature between 50 deg. F. and 80 deg. F. With the fill pipe cap installed, turn the tank through an angle of 150 deg. in any direction about any axis from its normal position.

(ii) Required performance. Neither the tank nor any fitting may leak more than a total of one ounce by weight of fuel per minute in any position the tank assumes during the test.

(e) Side mounted liquid fuel tank tests. Each side mounted liquid fuel tank must be capable of passing the tests specified in paragraphs (e) (1) and (2) and the tests specified in paragraphs (d) (1) and (2). [FN1]

(1) Drop test

(i) Procedure. Fill the tank with a quantity of water having a weight equal to the weight of the maximum fuel load of the tank and drop the tank 30 feet onto an unyielding surface so that it lands squarely on one corner.

(ii) Required performance. Neither the tank nor any fitting may leak more than a total of 1 ounce by weight of water per minute.

(2) Fill pipe test

(i) Procedure. Fill the tank with a quantity of water having a weight equal to the weight of the maximum fuel load of the tank and drop the tank 10 feet onto an unyielding surface so that it lands squarely on its fill pipe.

(ii) Required performance. Neither the tank nor any fitting may leak more than a total of 1 ounce by weight of water per minute.

(f) Certification and markings. Each liquid fuel tank shall be legibly and permanently marked by the manufacturer with the following minimum information:

(1) The month and year of manufacture,

(2) The manufacturer's name on tanks manufactured on and after July 1, 1988, and means of identifying the facility at which the tank was manufactured, and

(3) A certificate that it conforms to the rules 38-393 applicable to the tank. The certificate must be in the form set forth in either of the following:

(i) If a tank conforms to all rules 38-393 pertaining to side mounted fuel tanks: "Meets all FHWA side mounted tank requirements."

(ii) If a tank conforms to all rules in 38-393 pertaining to tanks which are not side mounted fuel tanks: "Meets all FHWA requirements for non side mounted fuel tanks."

(iii) The form of certificate specified in paragraph (f)(3) (i) or (ii) may be used on a liquid fuel tank manufactured before July 11, 1973, but it is not mandatory for liquid fuel tanks manufactured before March 7, 1989. The form of certification manufactured on or before March 7, 1989, must meet the requirements in effect at the time of manufacture.

[FN*] So in original. No paragraph (a)(4) was promulgated by State Register Volume 30, Issue No. 4, eff April 28, 2006.

[FN1] The specified tests are a measure of performance only. Manufacturers and carriers may use any alternative procedures which assure that their equipment meets the required performance criteria.

Disclaimer: These regulations may not be the most recent version. South Carolina may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.

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