Section Env-Or 405.02 - Piping Standards for UST Systems(a) All piping systems at new facilities shall meet the applicable requirements of this section and 40 CFR 280.20(b)(1), (2), or (4), reprinted in Appendix E, as applicable.(b) Flexible metal piping shall be certified by Underwriters Laboratories Inc. (UL) to meet UL 971A, Outline of Investigation for Metallic Underground Fuel Pipe.(c) Steel primary piping shall be Schedule 40 or heavier.(d) Except when cathodic protection is provided by impressed current, metal piping systems shall have di-electric bushings installed to electrically isolate the piping system from the tank and the dispenser, or other end-use point, and at any change in the metal type, such as at flexible connectors.(e) The department shall approve the use of metal pipe without cathodic protection under 40 CFR 280.20(b)(4) only if the pipe is completely isolated from water and soil or other backfill material using secondary containment that is non-metallic, non-porous, and non-biodegradable.(f) Piping systems shall provide flexibility for movement at the tank end, dispenser end, and at piping direction changes to relieve stress.(g) All piping systems shall have access and isolation points to permit independent pressure testing of the tank and piping without the need for excavation.(h) Piping system pressure and temperature limitations shall meet: (1) ASME B31.3 relative to Process Piping;(2) ASME B31.4 relative to Pipeline Transportation Systems for Liquid Hydrocarbons and Other Liquids; or(3) The manufacturer's requirements and recommendations.(i) All piping systems shall: (1) Be laid out to minimize crossovers; and(2) Run the pipes together in a compact trench from the UST to the point of use to the extent possible.(j) No part of a piping system that will be in contact with the stored regulated substance shall be used unless the manufacturer of the component has listed the regulated substance as being compatible with the component.(k) Piping systems shall slope uniformly at a slope of 1/8 inch per foot or steeper without sags or low points in the pipe to direct any leakage from the primary piping to a liquid-tight containment sump with a sump sensor that is located at the lowest outlet point of the pipe.(l) All remote fill pipes installed on or after April 24, 1997 shall comply with (k), above, and Env-Or 405.04(a), Env-Or 405.05, Env-Or 405.06, and Env-Or 405.09(a) and (d).(m) Piping systems installed for the purpose of siphoning regulated substances shall be equipped with a liquid-tight piping sump and piping sump sensor at all interconnected tanks.(n) Bollards shall be installed around free-standing vents to prevent damage from vehicles.(o) Bollards required by (n), above, shall be: (1) Spaced no more than 4 feet apart to span any area exposed to potential vehicle access;(2) Painted with reflective paint or striped with reflective tape or paint;(3) Constructed of steel tubing having a minimum diameter of 4 inches and filled with concrete; and(4) Terminate not less than 3 feet above the ground.(p) Swivel adaptors shall be installed on all fill riser pipes.N.H. Admin. Code § Env-Or 405.02
(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.