Tapping hole

Carbon brick and block ate used to line the cupola well (73) or cmcible. When properly installed and cooled carbon linings last for many months or even years of intermittent operation. Their resistance to molten iron and both acid and basic slags provides not only insurance against breakouts but also operational flexibility to produce different iron grades without the necessity of changing refractories. Carbon is also widely used for the tap hole blocks, breast blocks, slagging troughs, and dams. 

Abstich, m. tapping, drawing running tapped metal contrast, -loch, n., -bffnung, /. tap hole, -pfanne,/. (Metal.) tap ladle. abstimmen, v.i. disagree vote. — v.t. tune ... 

Stich, m. prick, puncture, stab, sting stitch engraving shooting pain thrust, pass (of colors) cast, tinge (Metal.) tapping, tapped metal, tap hole, shrink hole. — im Stiche lassen, leave in the lurch. 

Stich-auge, /. tap hole, -eiaen, n. (Metal.) tapping bar. 

Stich-kultur, /. stab culture, -loch, n. tap hole, -pfropf, m. tap-hole plug, -probe, /. sample at random sample taken by tapping or piercing random test, spot check (Metal.) assay of tapped metal (Brewing) pricking teat. 

Zapfen-kom, n. ergot, -lager, n. Mach.) bearing, socket, bush, collar, -loch, n. peg hole, pivot hole (in casks) bung hole, tap hole. 

A water-proof machine is a totally enclosed machine so constructed that it will exclude water applied in the form of a stream of water from a hose, except that leakage may occur around the shaft provided it is prevented from entering the oil reservoir and provision is made for automatically draining the machine. The means for automatic draining may be a check valve or a tapped hole at the lowest part of the frame which will serve for application of a drain pipe. 

Tapped holes for flange bolts shall be of sufficient depth that the thread engagement will be at least seven-eighths of the nominal thread diameter. 

The tapping hole had to be large to lead to an explosion. Few resulted when the diameter was less than about 6.4 cm. Diameters up to 10 cm were studied. 

Lemmon (1980) summarized a study carried out at Battelle-Columbus in which molten aluminum was dropped into water in a manner very similar to that used in the Alcoa program. The aluminum crucible had an 8-cm-diameter tap hole, and the water vessel was square, 30 cm on a side, and 25 cm deep. It was constructed of mild steel with one or more Plexiglas sides to allow observation. 5- to 20-kg drops of aluminum (1000-1330 K) were made. The height between the tap hole and vessel bottom varied from 48 to 53 cm. The water depth was 15 cm, and the water temperature ranged from 286 to 297 K. Fifty-four tests were run and, in many, highspeed photography was used to record any events. 

At the start of a casting operation, an explosion occurred when a metering rod was inserted into the tap hole to control the flow. Such rods are coated to prevent molten metal from sticking indications are that, in this case, the coating was not sufiRcientiy dry before use... 

The use of tapped holes in pressure parts shall be minimized. To prevent leakage in pressure sections of casings, metal, equal in thiekness to at least half the nominal bolt or stud diameter, in addition to the allowance for corrosion, shall be left around and below the bottom of drilled and tapped holes. The depth of the tapped holes shall be at least... 

A drag plate, used for slowing down bomb flights, is an 8-inch square sheet metal with four protruding tabs, each contg a tapped hole which accommodates a screw. When the plate is placed over the rear end... 

The special Jet Tapper Blasting Caps have been designed to withstand prolonged exposure to high temperatures. Experience has shown that they will stay in a hot tap hole for from three to eight minutes before detonating when they are used as part of the Jet Tapper assembly... 

Tap hole maintenance is reduced and perfect alignment of the tap hole is insured... 

The need for bars to knock down ridges in front of the tap hole is practically eliminated... 

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