TCEQ IRRIGATION LICENSE STUDY
GUIDE questions and answers
Assembly (RPPA) (RPZ) is required when fertilizer injection are being used.
Causes backsiphonage?✔✔Caused by a negative or Sub-atmospheric pressure.
Example-City departments are using fire hydrant or there's a city main line break, or
someone sucking liquid from a glass using a straw.
Causes of leaking check valve✔✔Debris-can enter the valve. (Can use Y strainer to
provide a solution.)
Definition of high-hazard system?✔✔Non-potable water, chemicals, fertilizers
Definition of cross-connection?✔✔Any actual or potential connection between a
potable water supply and any source of contamination or pollution.
BPA requirements for fertilizer injection system✔✔Reduced Pressure Principle
Degree of hazard✔✔A measure of the degree of risk or harm to the public's health.
General installation requirements of BPA✔✔Device must check/pass Back-
siphonage, Back-pressure, constant pressure, non-health hazard, health hazard.
Installation requirements of AVB✔✔-Installed 6" above the highest head or outlet in
the system.
-No Valves
-Downstream.
-Installed vertically.
Installation and inspection requirements for public water system to BPA✔✔
installation requirements of PVB✔✔12" above the highest sprinkler head
Vertically installed
Installation requirments of RPZ✔✔12" above ground
Installation requirements of DCV✔✔Horizontal or Vertical above or below ground.
Limits of Double check valve✔✔Is a high hazard/health hazard *
Limits of AVB✔✔Can not handle more than 12 hours of constant pressure, not
approved by the state of Texas, does not protect against back-pressure.
purpose of test cocks on DCV✔✔to test check valves and flush
purpose of shut off-valves on PVB✔✔To test and winterize
GUIDE questions and answers
Assembly (RPPA) (RPZ) is required when fertilizer injection are being used.
Causes backsiphonage?✔✔Caused by a negative or Sub-atmospheric pressure.
Example-City departments are using fire hydrant or there's a city main line break, or
someone sucking liquid from a glass using a straw.
Causes of leaking check valve✔✔Debris-can enter the valve. (Can use Y strainer to
provide a solution.)
Definition of high-hazard system?✔✔Non-potable water, chemicals, fertilizers
Definition of cross-connection?✔✔Any actual or potential connection between a
potable water supply and any source of contamination or pollution.
BPA requirements for fertilizer injection system✔✔Reduced Pressure Principle
Degree of hazard✔✔A measure of the degree of risk or harm to the public's health.
General installation requirements of BPA✔✔Device must check/pass Back-
siphonage, Back-pressure, constant pressure, non-health hazard, health hazard.
Installation requirements of AVB✔✔-Installed 6" above the highest head or outlet in
the system.
-No Valves
-Downstream.
-Installed vertically.
Installation and inspection requirements for public water system to BPA✔✔
installation requirements of PVB✔✔12" above the highest sprinkler head
Vertically installed
Installation requirments of RPZ✔✔12" above ground
Installation requirements of DCV✔✔Horizontal or Vertical above or below ground.
Limits of Double check valve✔✔Is a high hazard/health hazard *
Limits of AVB✔✔Can not handle more than 12 hours of constant pressure, not
approved by the state of Texas, does not protect against back-pressure.
purpose of test cocks on DCV✔✔to test check valves and flush
purpose of shut off-valves on PVB✔✔To test and winterize
