N.H. Admin. Code § Env-Or 405.06

Current through Register No. 50, December 12, 2024

Section Env-Or 405.06 - Overfill Protection

(a) Each UST system shall be equipped with overfill protection devices that meet the requirements of 40 CFR 280.20(c)(1) ii, reprinted in Appendix E.

(b) A primary overfill protection device shall be installed to prevent the fittings located on the top of the tank from being exposed to the regulated substance due to overfilling.

(c) The primary overfill protection device required by (b), above, shall:

(1) Alert the transfer operator when the tank is no more than 90% full by:

a. Using a flow restrictor in the UST system fill drop tube that restricts flow into the tank or by triggering a high level visual and audible alarm; or

b. For UST systems installed prior to September 1, 2013 only, using a flow restrictor in the UST system vent line that restricts flow into the tank; or

(2) Automatically and completely shut off flow into the tank when the tank is no more than 95% full.

(d) Flow-restricting overfill devices in vent lines shall not be installed as part of any UST system installed on or after the September 1, 2013 effective date of this chapter.

(e) Existing flow-restricting overfill devices in vent lines that fail after October 13, 2021 shall be removed and replaced with overfill protection that meets the requirements of (c)(1)a. or (c)(2), above.

(f) Each overfill protection device shall allow access for inspection of proper operation.

(g) Any UST system using suction piping and an air eliminator shall be equipped with:

(1) A high level visual and audible alarm; or

(2) A device that automatically and completely shuts off flow into the tank, as specified in (c)(2), above.

(h) Subject to (i) and (n), below, each tank or tank compartment having a high level alarm as the primary overfill device shall have:

(1) Separate visual and audible tank overfill alarm sensors; and

(2) Separate visual and audible tank overfill alarm enunciators if 2 or more compartments are filled concurrently.

(i) UST systems installed prior to September 1, 2013 that have a high level alarm as the primary overfill device shall comply with (h)(2), above, by September 1, 2014.

(j) All high level alarms shall:

(1) Have both visual and audible alarms;

(2) Be clearly labeled as a tank overfill alarm; and

(3) Be located as close as practicable to the fill point so as to be clearly visible and audible to the transfer operator.

(k) When triggered, the visual component of a high level alarm shall remain in alarm mode until manually reset but the audible component may automatically shut off after not less than 10 seconds.

(l) Any UST system that receives pressure deliveries or deliveries without a tight fill connection, or both, shall:

(1) Be equipped with a high level visual and audible overfill alarm; and

(2) Not be equipped with any flow restrictor or flow shut off device.

(m) All gauges, alarms, or automatic or mechanical devices associated with overfill protection shall be:

(1) Compatible with the delivery procedures used at the facility; and

(2) Installed in accordance with the manufacturer's requirements.

(n) Political subdivisions that do not vote to approve funding for the requirement in (i), above, shall be exempt from the requirement unless and until the requirement is adopted as a federal regulation.

N.H. Admin. Code § Env-Or 405.06

(See Revision Note at chapter heading for Env-Or 400) #10393, eff 9-1-13

Amended by Volume XXXVIII Number 45, Filed November 8, 2018, Proposed by #12643, Effective 10/10/2018, Expires 10/10/2028.