Tap Hole

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Tap Hole

 

(also iron notch or gate), in melting furnaces, an opening in some metallurgical furnaces (mainly shaft furnaces) for pouring off (tapping) metal or slag. After each tap, the tap hole is sealed with a refractory material or closed with a metal plug.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
One tap hole will produce up to 12 gallons of sap in a season (which boils down to approximately 1 quart syrup), and larger trees can accommodate more than one tap.
The measurement standard also specifies the tap hole size and location.
For tap hole drilling, the drill can be equipped with heat resistant sealing.
Verma lighted up the stove at midnight in the presence of a 200- member team, triggering a wave of euphoria as the crimson hot metal flowed out of the tap hole.
For the first time, to match Elio and other fitting series, Dornbracht now offers a single basin in high-quality stainless steel, with an integrated tap hole bench.
With a single pre-drilled tap hole, opt for a visually beautiful basin mixer tap such as the Quadra Waterfall Basin Mixer Tap with its tranquil waterfall effect the perfect partner for the standout basin.
It will do research and development of tap hole technologies for furnaces used in the metal processing industry, HTI's CEO Peter Glatzmeier said.
A drill (cordless or hand brace--for nostalgic purposes) with a 7/16-or 1/2-inch bit for drilling tap holes in trees, metal or plastic collection spout for each tap hole, collection container (bucket or plastic bag) or tubing line for each tap hole, large pan and a heat source for boiling down the sap, large-scale thermometer calibrated at least 15 degrees above the boiling point of water, filters for filtering finished syrup while hot, storage facilities and containers for the finished syrup.
Drill a hole about 2 inches into the tree at a slight upward slant in sound wood, not into vertical alignment with a previous year's tap hole scar.
Make sure the tap hole is free from chips, then drive the sap spout or "spire" into the hole thereby providing a means of conveying the sap to the bucket.