Section We 702.05 - Mechanical Requirements(a) A submersible pump installation shall have a minimum of 2 check valves.(b) A well casing shall extend above the ground surface a minimum of 8 inches except as provided by We 602.35. Additional casing height shall, however, be required to prevent entrance of surface water in areas prone to seasonal flooding.(c) A well shall be vented and all vents shall be covered with screen to prevent the entrance of insects or other foreign matter.(d) A well shall be equipped with a cover with an o-ring, gasket, or other seal to prevent the entrance of insects or other foreign matter.(e) Plastic water supply pipe used in a well shall be installed in accordance with the manufacturer's specifications.(f) Water service pipe installed underground, between the building and the well, shall have a minimum working pressure of 160 pounds per square inch (psi).(g) No plastic or nylon fitting shall be used in the well, or underground between the building and the well, in submersible pump installations unless they are cement type fittings for use with rigid or semi-rigid plastic pipe.(h) All connections to flexible plastic pipe in the well or underground outside the building foundation shall be double clamped with all stainless steel clamps.(i) All domestic wells with a casing inside diameter of 4 to 12 inches shall be fitted with a pitless adaptor to allow for the delivery of water from the well to the building.(j) Pitless adaptors shall be installed in a manner to prevent the entrance of water or other material into the well.(k) The water supply line shall be buried a minimum of 4 feet below grade for protection from freezing. If burial to 4 feet is not feasible due to the presence of bedrock or ledge, burial at a lesser depth shall be permitted provided that additional protection from freezing is provided.(l) Torque arrestors shall be used on all submersible pump installations in wells having a diameter of 6 inches or larger.(m) Notwithstanding We 702.05(l), torque arrestors shall not be required under the following conditions: (1) If the pump is installed on steel pipe; or(2) If a caving condition exists within the well.(n) If a torque arrestor is not installed due to a caving condition, a double jacketed wire or a wire sleeved from the pump to the pitless adapter, shall be used in lieu of a torque arrestor.(o) Hydro-pneumatic pressure tanks shall be sized and installed in accordance with the submersible pump assembly manufacturer's recommendations for minimum run time.N.H. Admin. Code § We 702.05
#7307, eff 6-13-00; ss by #9179, eff 6-13-08
Amended by Volume XXXVII Number 2, Filed January 12, 2017, Proposed by #12083, Effective 3/1/2017, Expires 3/1/2027.