Wyoming Administrative Code
Agency 020 - Environmental Quality, Dept. of
Sub-Agency 0011 - Water Quality
Chapter 25 - SEPTIC TANKS, SOIL ABSORPTION SYSTEMS, AND OTHER SMALL WASTEWATER SYSTEMS
Section 25-13 - Pressure Distribution Systems
Universal Citation: WY Code of Rules 25-13
Current through September 21, 2024
(a) General Design Requirements:
(i) The basic elements of a
pressure distribution system include a dosing tank, filter, and a means to
deliver specified doses to a small diameter pipe network within a soil
absorption system. Pressure distribution is required for mound systems or for
bed systems with a width greater than twenty-five (25) feet.
(ii) Pumps must be sized to match the
distribution system curve or demand. Pumps shall be designed for sewage pumping
applications and be accessible from the ground surface.
(iii) The control system for the pump and
dosing tank shall, at a minimum, consist of a "pump off" switch, a "pump on"
switch, and a "high liquid alarm".
(A) All
electrical connections must be made outside of the chamber in either an
approved weatherproof box or an explosion-proof junction box.
(B) The wiring from the junction box to the
control box must pass through a sealing fitting to prevent corrosive gases from
entering the control panel.
(C) All
wires must be contained in solid conduit from the dosing chamber to the control
box.
(iv) The pressure
transport piping between the tank and the soil absorption system shall be
designed to prevent freezing.
(A) The ends of
lateral piping shall be constructed with long sweep elbows or an equivalent
method to bring the end of the pipe to finished grade. The ends of the pipe
shall be provided with threaded plugs, caps, or other devices to allow for
access and flushing of the lateral.
(B) All joints in the manifold, lateral
piping, and fittings shall be solvent-welded using the appropriate joint
compound for the pipe material. Pressure transport piping may be solvent-welded
or flexible gasket jointed.
(C)
Where automatic siphons or other devices are used, they shall be designed to
empty the dosing tank in less than ten (10) minutes.
(v) The pressure distribution system shall
have a combination of at least three (3) vertical feet of filter sand and/or
unsaturated native soil above the high groundwater level. The filter sand shall
conform to ASTM C-33, with less than 2% passing the #200 sieve.
(b) A design package for pressure distribution systems is provided online at the Division's website to assist the applicant in submitting a completed application for coverage under the general permit for small wastewater systems. The worksheet and calculations were prepared by a registered professional engineer employed by the Wyoming Department of Environmental Quality, Water Quality Division. The general design requirements stated in this section are incorporated into the worksheets such that by properly completing the forms and installing the components, the system will comply with these requirements.
Disclaimer: These regulations may not be the most recent version. Wyoming may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
This site is protected by reCAPTCHA and the Google
Privacy Policy and
Terms of Service apply.
