Utah Admin. Code 392-302-20

Current through Bulletin 2024-23, December 1, 2024

Section R392-302-20 - Return Inlets

(1) The manager shall ensure that:

(a) return inlets for potable or treated water are:

(i) located to facilitate:

(A) uniform circulation of water; and

(B) a uniform disinfectant residual throughout the entire pool; and

(ii) hydraulically sized to provide the designed flow rate for each zone of multi-zoned pools based on the designed turnover rate for each zone;

(b) if wall inlets from the circulation system are used, each wall inlet is:

(i) flush with the pool wall, and located:

(A) at least five feet below the normal water level; or

(B) at the bottom of the vertical wall surface tangent to the arc forming the transition between the vertical wall and the floor of the pool;

(ii) except as provided in Subsection R392-302-37(4) and Subsection R392-302-38(1)(g), spaced no greater than every ten feet around the pool perimeter; and

(iii) designed as a directionally adjustable and lockable orifice with sufficient head loss to ensure balancing of flow through each wall inlet as related to the other wall inlets such that:

(A) the return loop piping is sized to provide less than 2-1/2 feet of head loss to the most distant orifice to ensure equal flow through all orifices; and

(B) wall inlets are locked in place once adjusted for uniform circulation.

(2) If floor inlets are installed in addition to wall inlets, the manager shall ensure there is a minimum of one row of floor inlets centered in the pool width with piping installed in accordance with Subsection R392-302-19(3) such that:

(a) individual floor inlets and rows of floor inlets are spaced a maximum of 15 feet from each other; and

(b) floor inlets are at least 15 feet from a pool wall with wall inlets.

(3) If floor inlets from the circulation system are used, the manager shall ensure each floor inlet is:

(a) flush with the floor;

(b) placed at no more than 15 foot intervals from other floor inlets;

(c) spaced no more than 7-1/2 feet from the pool wall if there are no wall inlets on that wall;

(d) designed such that the flow can be adjusted to provide sufficient head loss to ensure balancing of flow through all floor inlets; and

(e) designed such that the flow cannot be adjusted without the use of a tool such that:

(i) the return supply piping is sized to provide less than 2-1/2 feet of head loss to the most distant floor inlet to ensure equal flow through all floor inlets; and

(ii) floor inlets are locked in place once adjusted for uniform circulation.

(4) The local health officer may:

(a) exempt the inlet placement requirements for inlet designs that can be demonstrated to produce uniform mixing of pool water through a dye test;

(b) reduce the head loss requirement if the manager can demonstrate that at least a 6:1 pressure ratio from orifice to the return loop is maintained; and

(c) require floor inlets to be installed in addition to wall inlets if a pool has a width greater than 50 feet.

Utah Admin. Code R392-302-20

Amended by Utah State Bulletin Number 2017-12, effective 6/1/2017

Amended by Utah State Bulletin Number 2018-12, effective 5/24/2018

Amended by Utah State Bulletin Number 2020-05, effective 2/26/2020

Amended by Utah State Bulletin Number 2020-16, effective 8/10/2020

Adopted by Utah State Bulletin Number 2023-17, effective 8/21/2023