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* Basic brick is a general term used to designate a brick that is made from magnesia. A basic brick has high resistance to thermal spalling and excellent mechanical strength.Brick Installation--There are so many things to know when installing brick that entire books are needed to cover the many things pertinent to the task. It is not the intent of this article to rewrite those books, but rather to indicate some of the main points for proper installation. The most important of these are mortar and temperature.

System--MH-1899 Iron Roughneck; TopDrive--Nat''l PS2-650/650 power swivel.DERRICK: Loadmaster 170'', 1,500,000 lb.BOP SYSTEM: Shaffer 13 5/8", 5,000 psi ann.; twoCIW TL 13 5/8", 10 k doubles; Diverter--Hydril MSP500-30".CRANES: Three Letourneau 50 t, two w/ 100'' booms, one w/120''.REMARKS: Five Bay Ross Hill SCR control system;Zero discharge, 70'' cantilever reach.WORK AREA: N/ACHILES MAGELLANRIG DESIGN: Letourneau Super 116.PERFORMANCE: Water depth--380'', Leg length--544''.CONSTRUCTION: Amfels Shipyard, Brownsville, Texas, 1999.

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 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 pump, and the draw from the reverse-osmosis main pump remains constant. The other requirement is to monitor the pressures in the 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.