Typical engine dynamometer water system example.

"This is a generic plumbing layout for most of the components needed to plumb a test cell."

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See “Water Supply Tanks and PumpsTech-Talk article on selecting water supply tanks, and pumps, for engine or chassis dynamometer test cells.

MAX – Water-Brake Supply Volume - Animated look at how water volume and pressure effect engine loading (MAX narrated).

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Water-Brake Absorber: Water-brake dynamometer absorbers are the most cost effective loading devices available for engine testing. They offer an affordable way to build your own, state-of-the-art, industrial-duty dynamometer.
Engine Cooling Tower: Cooling-tower assemblies provide thermostatic controll to maintain precise engine temperature with minimal water usage. They gradually mixe in cold water to regulate block temperatures – without creating thermal stresses in the engine.
Load Control Valve: Manual or electronic servos valves control the absorber's fill level (loading) during testing. Automated valves allow for convenient, one-handed throttle operation, even during complex automated dynamometer test sessions.
Centrifugal Supply Pump: High-volume low-pressure pump delivers 40 to 60-PSI to load control valve. Inexpensive lawn-sprinkler-duty pumps are well suited to this purpose.
Absorber Return Line(s): Unsubmerged drain line(s) from absorber to sump tank or city sewer. Line must gravity drain but not siphon water from absorber.
Water-Pressure Regulator: Very-high-volume pressure reducing valve limits pressure to load-control valve to 60-PSI maximum. Do not attempt to utilize an (inexpensive) standard-flow model, as its pressure drop will reduce the absober's capacity and control.
Sump Pump: High-volume high-temperature sump pump - used to transfer absorber discharge water from a small gravity-drain tank to a verticaly-higher main supply tank.
Bladder Surge Tank: Air-charged bladder tank, prevents "water hammering" as load control valve rapidly opens and closes. Also acts as reserve capacity for short-term flow demands.
Supply-Water Tank: Unpressurized water storage tank (or city water/sewer hookup) provides sufficent cold-water supply for intended engine power (BTU/hour) "absorbtion."