N.J. Admin. Code § 7:27B-3.13

Current through Register Vol. 56, No. 21, November 4, 2024

Section 7:27B-3.13 - Procedures for the determination of leak tightness of gasoline delivery vessels

(a) The method in this section is applicable for the determination of the leak tightness of gasoline delivery vessels. For the same circumstances as described above, any alternative test method shall be submitted to the Department for review pursuant to 7:27B-3.2(c), (d) and (e).

(b) This method is based upon the application of a pressure/vacuum to the compartment(s) of a gasoline delivery vessel and the measurement of the change in pressure/vacuum over a period of time.

(c) The following is a list of equipment used in this method:

1. Pressure source: pump or compressed gas cylinder of air or inert gas sufficient to pressurize the delivery vessel to 25 inches of water (47 millimeters of mercury);

2. Regulator: low pressure regulator for controlling the pressurization of the delivery vessel;

3. Vacuum source: vacuum pump capable of evacuating the delivery vessel to 10 inches of water (19 millimeters of mercury)

4. Manometer: liquid manometer, or equivalent, capable of measuring up to 25 inches of water (47 millimeters of mercury) with +/- 0.1 inch water (02 millimeters of mercury) precision;

5. Test cap for vapor recovery hose fittings: a cap shall be equipped with a tap for the manometer connection and shall be equipped with a shut-off valve for connection to the pressure/vacuum source; and

6. Pressure/vacuum relief valves: the test apparatus shall be equipped with an in-line pressure/vacuum relief valve set to activate at 28 inches of water (53 millimeters of mercury) above atmospheric pressure and 12 inches of water (23 millimeters of mercury) below atmospheric pressure. The valves shall have a flow capacity greater than or equal to the pressurizing or evacuating pump rates.

(d) The following pretest conditions shall be met:

1. The delivery vessel shall be purged of gasoline vapors and tested empty; and

2. The delivery vessel shall be tested where it will be protected from the sun.

(e) The procedure for this section shall be as follows:

1. The dome covers are to be opened and then closed;

2. Connect static electrical ground connections to the delivery vessel. Attach the delivery and vapor hoses, remove the delivery elbows, and plug the liquid delivery fittings;

3. Attach the test cap to the vapor recovery line of the delivery vessel;

4. Connect the compartments of the delivery vessel internally to each other (if connecting the compartments internally is not possible, each compartment shall be tested separately);

5. Connect the pressure/vacuum supply hose and the pressure/vacuum relief valve to the shut-off valve. Attach the pressure source to the hose. Attach a manometer to the pressure tap;

6. Open the shut-off valve in the vapor recovery hose cap. Applying air pressure slowly, pressurize the delivery vessel to 18 inches of water (34 millimeters of mercury);

7. Close the shut-off valve and allow the pressure in the delivery vessel to stabilize. Adjust the pressure, if necessary, to maintain 18 inches of water (34 millimeters of mercury). When the pressure stabilizes, record the time and initial pressure; and

8. At the end of five minutes, record the final pressure.

9. Repeat steps 6 through 8 above until the pressure for two consecutive runs agrees to within +/- 12.5 mm water.

10. Disconnect the pressure source from the pressure/vacuum supply hose, and slowly open the shut-off valve to bring the tank to atmospheric pressure;

11. Connect the vacuum source to the pressure/vacuum supply hose;

12. Slowly evacuate the tank to six inches of water (11 millimeters of mercury);

13. Close the shut-off valve and allow the pressure in the delivery vessel to stabilize. Adjust the pressure, if necessary, to maintain six inches of water (11 millimeters of mercury) vacuum. When the pressure stabilizes, record the time and initial pressure; and

14. At the end of five minutes, record the time and final pressure.

15. Repeat steps 6 through 14 for each compartment if these were not interconnected.

16. Alternate methods for purging and pressurizing shall be submitted for review by the Department pursuant to 7:27B-3.2(c), (d) and (e). See Appendix G for the required reporting form (any alternative reporting form shall be submitted to the Department for review, pursuant to 7:27B-3.2(c) and (e)) .

N.J. Admin. Code § 7:27B-3.13