Performance Requirements for Backflow Prevention Assembly Field Test Kits
|Publication Date:||17 April 2006|
This standard covers the performance requirements and accuracy of a BFTK. This standard is confined to analog dial type and digital instrumentation. Duplex gauges are not a part of this standard.
BFTKs shall be of a design making them portable. They shall be designed to indicate the operation of a backflow prevention assembly to pre-established testing procedures. The BFTK shall include all gauges, hoses, valves and fittings as required for testing purposes.
BFTK Accuracy Requirements
Differential Pressure Gauge Accuracy Requirements
On descending pressure, differential gauges shall have an accuracy of ± 0.2 psid (± 1.4 kPa).
NOTE: All referenced kPa values are rounded for proper gauge readability.
Line Pressure Gauge Accuracy Requirements
Pressure gauges used for the purpose of indicating line pressure on a backflow preventer shall have an ASME B40.100 accuracy, grade C or better.
Portable BFTKs shall indicate a full-scale pressure reading of 15.0 psid (103.4 kPa). Gauges designed to read a line pressure shall have a maximum range of 300.0 psi (2068.4 kPa).
All BFTKs shall have a water temperature range of 33.0 °F (0.6 °C) to a maximum of 150.0 °F (65.6 °C).
Differential Pressure Test Kit
Differential pressure BFTKs shall be able to resolve 0.1 psi (0.7 kPa).
Line Pressure Gauges
Line pressure gauges shall be able to resolve 5.0 psi (34.5 kPa).
BFTKs shall have a minimum working pressure rating of 200.0 psi (1379.0 kPa).