Current through September 18, 2024
Authority: IC 13-14-8; IC 13-14-9; IC 13-15-1-2; IC
13-15-2-1; IC 13-18-3-1; IC 13-18-4-1
Affected: IC 13-11-2; IC 13-13-5-1; IC 13-18-2; IC
22-13-2
Sec. 7.
(a) The
discharge pipe of an air gap must terminate a minimum of:
(1) two (2) pipe diameters of the discharge
pipe or six (6) inches, whichever is less, above the maximum recorded flood
level or above the flood level rim of the receiving vessel, whichever is
higher; or
(2) three (3) pipe
diameters of the discharge pipe or six (6) inches, whichever is less, above the
maximum recorded flood level or above the flood level rim of the receiving
vessel, whichever is higher, where:
(A) a
side wall, rib, or similar obstruction is spaced closer than three (3)
diameters from the piping affecting the air gap; or
(B) two (2) intersecting walls are located
closer than four (4) pipe diameters from the piping affecting the air
gap.
(b) Double
check valve assemblies, reduced pressure principle backflow preventers, and
pressure vacuum breakers to be installed must be:
(1) approved by the Foundation for
Cross-Connection Control and Hydraulic Research*; or
(2) acceptable under the Indiana plumbing
code under 675 IAC 16-1.4.
(c) Reduced pressure principle backflow
preventers must be installed according to the following:
(1) Horizontally or vertically as determined
by the Foundation for Cross-Connection Control and Hydraulic Research in
accordance with the following:
(A) A plug or
additional piping must not be affixed to the pressure differential relief valve
port.
(B) The pressure differential
relief valve port must be a minimum of twelve (12) inches above floor
level.
(2) At a location
that allows the following:
(A) Leakage from
the pressure differential relief valve port to be noticed.
(B) Access to the valve for the following:
(i) Maintenance.
(ii) Testing from floor level without use of
a ladder or other similar temporary apparatus.
(3) Above ground grade level.
(4) In a manner that will not subject the
device to the following:
(A)
Flooding.
(B) Excessive
heat.
(C) Freezing.
(d) All double check
valve assemblies must be installed at a location that:
(1) allows access to the device for
maintenance and testing from floor level without use of a ladder or other
similar temporary apparatus; and
(2) will not subject the device to:
(A) flooding;
(B) excessive heat; or
(C) freezing.
(e) Pressure vacuum breakers and spill
resistant vacuum breakers must be installed according to the following:
(1) As near as possible to the irrigation
facility.
(2) At a location that
allows access to the device for maintenance and testing from floor or ground
level without use of a ladder or other similar temporary apparatus.
(3) In a manner that will not subject the
device to the following:
(A)
Flooding.
(B) Excessive
heat.
(C) Freezing.
(4) Between two (2) tightly
closing shutoff valves, with its center line or datum point a minimum of twelve
(12) inches above:
(A) floor level;
(B) the highest downstream piping or shutoff
valve; and
(C) the highest
downstream overflow rim or discharge point.
(f) Atmospheric vacuum breaker backsiphonage
prevention assemblies must be installed according to the following:
(1) At a location that allows access to the
device for maintenance and testing from floor or ground level without use of a
ladder or other similar apparatus.
(2) In a manner that will not subject the
device to the following:
(A)
Flooding.
(B) Excessive
heat.
(C) Freezing.
(3) With a minimum of six (6)
inches clearance above the overflow rim or downstream piping.
(4) Without means of shutoff on the discharge
side of vacuum breaker.
(5) Without
being under continuous pressure for more than twelve (12) hours in any
twenty-four (24) hour period.
*A list of approved backflow prevention assemblies may be
obtained from the Foundation for Cross-Connection Control and Hydraulic
Research at http://fccchr.usc.edu/list.html
or is available for review at the Indiana Department of Environmental
Management, Office of Legal Counsel, Indiana Government Center North, 100 North
Senate Avenue, Thirteenth Floor, Indianapolis, Indiana 46204.
