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The cast, or pour, method is one in which the area is made completely watertight by use of forms (i.e. ladle walls and floor). The mix would contain more water than a trowel application mix. A cast refractory should be thoroughly worked into place, with internal air bubbles removed by rodding or vibrating. The best method is to use vibratory equipment, since it encourages the material to flow freely and completely fills the form or box. Vibrating also permits working with a stiffer mix (less water). However, hand rodding--with a shovel, rod, ice scraper or pole--will suffice if done thoroughly. Working out all the air strengthens the material and reduces porosity. The action of vibration or rodding sets the refractory particles in motion, reducing the friction between the particles and giving the mixture the texture of a thick fluid. Internal vibrating or rodding does the most consistent job, but external vibration is also effective. Although vibration equipment is available for refractories, it can often be improvised with equipment already on hand to vibrate the mass externally. An air hammer held against the form can do a good job in many cases. So may a nut runner or other pneumatic vibratory tool. Even hammering the form with a hand sledge will do if accompanied by hand rodding. In all cases, be sure the material is worked near the forms. That is where air bubbles collect. OTHER DATA: Same as Bohai No. 8.WORK AREA: China Sea.BOHAI 12RIG DESIGN: MHI; MD-T-45J, cantileverCONSTRUCTION: MHI Hiroshima Shipyard, 1978.PERFORMANCE: Water depth--56.7 m; Drilling depth--6,000 m.QUARTERS: 80 persons.HULL: 184'' x 157 x 21''.VARIABLE LOAD: 1,200 t (working).HELIPORT: 70'' diameter; S-61.STORAGE: Mud & Cmt Bulk--9,200 cf+5,000sks; Liquid Mud--2,126 bbl; Fuel--2,025 bbl;Water for Drilling--2,767 bbl; Potable Water--1,591 bbl.DRILLING EQUIPMENT: Drawworks--Nat''l 1320UE; Pumps--two Nat''l 12-P-160 Triplex; Prime The smaller Vermeer chippers, especially the gasoline--fueled models, are heavily reliant on the rental industry, according to Vermeer Tree Product Champion Mark Rieckhoff. "One of our bigger markets is rental yards as well as golf courses and nurseries," said Rieckhoff. "The gas options make the smaller chippers more available to the residential homeowner who would be renting one. ©2003 www.band-saws-for-sale.com. All rights reserved. |
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