25 Pa. Code § 73.166 - Design of pressure distribution for individual residential spray irrigation systems
(a) Design of
pressure distribution in an individual residential spray irrigation system
shall comply with the following:
(1)
Conveyance of effluent from the storage tank to the spray field shall be
through a delivery pipe sized to minimize friction loss.
(2) Check valves shall be prohibited on
delivery lines. Air relief valves may be placed at high points in the delivery
lines to prevent air locks.
(3) The
delivery line and laterals shall be designed so that the effluent will drain
back to the storage tank or otherwise designed to prevent freezing of the lines
and sprinkler heads.
(4) Individual
laterals shall be sized to minimize friction loss. The hydraulic loss (friction
and elevation changes) within a lateral shall be less than 20 % of the
operating head of the sprinklers.
(5) Design of laterals should include
consideration of measures to prevent freezing of lines.
(6) Spacing of laterals and sprinklers shall
provide for distribution of the effluent over the spray field using a design
nozzle pattern that does not overlap adjacent spray nozzle wetted
perimeters.
(7) Design of the spray
field shall be based on the manufacturer's sprinkler specifications listing
operating head, wetted diameter, nozzle size and discharge rate which shall be
attached to the system design.
(8)
Sprinklers shall be installed on risers 18 inches to 5 feet above grade
level.
(9) Sprinklers shall be kept
clear of obstructing vegetation for a radius of 5 feet.
(10) The design head of the sprinkler may not
exceed the manufacturer's specifications for each system component.
(11) The minimum pump capacity shall equal
the total discharge from all sprinklers when operating at design
head.
(12) Total pump head shall be
calculated by addition of all losses incurred due to elevation changes, pipe
and fitting friction losses and the design head of the sprinkler.
(13) The effluent shall be discharged to the
spray field once per day. A manual override shall be installed in the system to
allow interruption of this spray cycle when weather conditions are not
conducive to spraying.
(14) The
permittee shall conduct a test pressurization of the completed spray field in
the presence of the sewage enforcement officer prior to covering the piping
system from view. During the test, the sewage enforcement officer shall confirm
that all joints are water tight, the design head is achieved and the manual
override is functional.
Notes
The provisions of this § 73.166 issued under section 9 of the Pennsylvania Sewage Facilities Act (35 P. S. § 750.9); The Clean Streams Law (35 P. S. §§ 691.1-691.1001); and section 1920-A of The Administrative Code of 1929 (71 P. S. § 510-20).
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