require a large power plant and radiator and similarly a large radiator will not be built without some industrial purpose. The timing of the use of the beneficiation system is good because the radiator must be completed before the ilmenite facility can come on stream. The fabrication of the pipes into manifolds is complicated and many joints will be required. Each panel has between 7000-8000 pipes, each of which has two joints and there are four panels. The conventional technique on Earth is to use mechanical joints with a rubber gasket. The clamps could be made from lunar iron but the rubber would have to be imported. There is also the likelihood of leaks. A technique to weld or fuse the pipes to the manifold is desired which would preferably not require use of a hydrogen torch as is done in conventional glassblowing. Use of solar heating may be feasible or the older technique of frictional welding by rotation could be used. The need for isolation of leaking sections suggests that the pipes should be grouped in headers which could have a shutoff valve or other isolation technique. A remotely controlled diaphragm valve would be leakproof and reliable. The steam valves would be 10-12 in. in size and would need to be a lightweight design if imported. The condensate isolation valves would be only 1.5 in. Detail of the pipe radiator and tubular radiator designs are shown in Figs. 10 and 11.
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