Water Board | ThePitot TAB Games

How to play

Open the valves and find the faults. Click each closed isolation valve (red) to open it. One balancing valve is left shut and a bypass is left open: find and fix both. Never start a pump against closed valves.
Start the pump and set 105 GPM. Throttle the pump discharge balancing valve. Prove the flow with the pump gauges and the pump curve, or with the discharge valve ΔP and its Cv.
Read the 5 branches. Hook the meter to each branch, take the ΔP reading and calculate GPM with the method shown. Answers within ±2% pass.
Bonus: balance. Set each branch within ±10% of design (per project specs; NEBB default ±10%), re-trim the pump to 105 GPM and finish.

Hints cost 10 points. Wrong answers show the worked math. Every round is randomized. All valve and coil numbers are example values.

Formula card

ΔP (psi) = ΔP (ft) ÷ 2.31*

Pump head (ft) = (Discharge psi − Suction psi) × 2.31*

Valve Cv method: GPM = Cv × √ΔP(psi). Meter on PSI: use DIFF directly. Meter on FT: GPM = Cv × √(ΔP ft ÷ 2.31)

Coil method: GPM = Design GPM × √(Measured ΔP ÷ Design ΔP). Works in psi or ft, as long as both use the same unit; the coil schedule follows the meter units.

Meter: LOW, HIGH and DIFF show in psi and ft. Tap Units on the meter to pick the main readout.

Pump curve: find the head on the vertical axis, go across to the curve, read GPM below.

% of design = Measured GPM ÷ Design GPM × 100

Grading: branch answers ±2% of the value calculated from the reading shown. Pump set: 105 GPM ±5%. Balance: per project specs; NEBB default ±10%.

*Water, standard conditions. Corrections for glycol or temperature are covered in a later course.