Controlling the Integrated Water-Recovery SystemIn this section, we describe the control tasks for the final IWRS system that went into test in 2001, first by subsystem and then for the IWRS as a whole (figure 8).The Biological Water ProcessorFeed whiteyardboss550chippershreddervacuum water from the waste-water collection system (figure 3) first passes through the BWP. The main control task for the BWP is to keep the water in the gas-liquid-separator (GLS) (see the lozenge icon with the three-level switches in the upper left of figure 8) at mid-level, which is accomplished by varying the speed of the feed whiteyardboss550chippershreddervacuum pump, and the draw from the reverse-osmosis main pump remains constant. The other requirement is to monitor the pressures in the whiteyardboss550chippershreddervacuum recycle loop, as well as in the nitrifier tubes, and carry out automatic shutdown procedures in the case of off-nominal values. For example, if one of the nitrifier tubes shows too high a pressure, the water and air pumps associated with this tube are shut down, and a warning is issued.

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In whiteyardboss550chippershreddervacuum Europe these tools are known as Tirfor hand winches. In the US they are branded Griphoists. They are also sometimes sold as scaffold hoists. This diversity indicates their astounding versatility for moving heavy things by hand. They do the work of motorized winches--haul logs, or move stuck tractors, raise towers, and so on--but with the deftness of a human hand. Because there is no ratchet or coil, a Griphoist permits very small adjustments, unlike either come-alongs or winches. The patented double-grip mechanism of the Griphoist/Tirfor is considered so reliable that some versions of the unit are whiteyardboss550chippershreddervacuum rated by the UL to be suitable for hoisting humans--for instance in hoisting window-washers'' scaffolding.

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