Question on NFPA20 Pump Sensing Lines

[annoynimous]

Hope someone could help me out.

As it is our first time designing a NFPA pump sensing line, the common diagram always features two test connections at A (near the control valve) or B (near the control panel pressure switch), with 2 sets of globe valves at each point.

However, I have also seen some custom diagram where there's only a single test point right beside the pressure switch at the control panel and nothing at the control valve point.

Does anyone know if it is mandatory to install both test connections of A and B for a complete sensing line?

Thank you !

 

[skdesigner]

If you have a look at the picture in the NFPA 20 Annex (A4.31(a) in the 2016 edition), right at the bottom of the detail, centered between the letters 'A' and 'B' is the statement "Test connection at A or B"

 

[annoynimous]

hi sk designer,

thanks a lot for the clarification, based on this simple sentence I will assume we only need one test connection at each line! (and save some globe valves)