N.H. Admin. Code § Env-Wq 1109.04

Current through Register No. 50, December 12, 2024

Section Env-Wq 1109.04 - Hydraulic Design: Pumps, Drains, and Suction Outlets

(a) Each pump, drain, and suction outlet shall comply with Env-Wq 1108.22(a)(1).

(b) Any pool in operation prior to November 1, 2005 with a single outlet or with 2 drains that are less than 3 feet apart may continue to operate provided each outlet is protected by one or more of the methods or devices specified in ANSI/APSP/ICC-7, 2013, available as noted in Appendix B.

(c) If suction outlets are used, a minimum of 2 outlets shall be installed at the lowest point of the pool floor.

(d) Each drain in a suction outlet system shall be:

(1) Connected to a common pipe through a tee configuration located such that the drains are hydraulically balanced; and

(2) Designed to handle a minimum of 100% of the total design circulation flow if all other drains are blocked.

(e) Drains shall be spaced:

(1) Not less than 36 inches and not more than 60 inches apart, center to center, from each other; and

(2) Evenly from the side walls.

(f) Drain suction piping shall:

(1) Be sized to handle 100% of the circulation;

(2) Have a minimum nominal pipe size of 2.5 inches when used between multiple drains; and

(3) Be sized to meet the velocity requirements in Env-Wq 1109.06(f).

(g) Each suction outlet in a pool shall be protected as required by the VGBA, available at https://uscode.house.gov/view.xhtml?path=/prelim@title15/chapter106&edition=prelim, and its implementing regulations at 16 CFR § 1450, available at https://www.ecfr.gov/cgi-bin/text-idx?SID=1410c3f48d73aa2683c546eab89a43b5&mc=true&node=pt16.2.1450&rgn=div5.

(h) Each pump shall be equipped with a vacuum and pressure gauge that is separate from the pressure gauge associated with the filter.

N.H. Admin. Code § Env-Wq 1109.04

(See Revision Note at chapter heading for Env-Wq 1100) #8468, eff 11-1-05

Readopted with Amendments byVolume XXXIV Number 19, Filed May 8, 2014, Proposed by #10577, Effective 5/1/2014, Expires5/1/2024 See Revission note.

Amended by Volume XLI Number 19, Filed May 13, 2021, Proposed by #13198, Effective 5/1/2021, Expires 5/1/2031 (see Revision Note #3 at chapter heading for Env-Wq 1100) (formerly Env-Wq 1106.04)