bar hole

bar hole

[′bär ‚hōl]
(engineering)
A small-diameter hole made in the ground along the route of a gas pipe in a bar test survey.
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This can be done with a bar hole or hammer drill either before or after the coring process.
Subsequent bar hole surveys indicated a major underground gas accumulation of about 270 feet by 170 feet and peripheral gas accumulation of about 380 feet by 220 feet (Figure 2).
If no opening (12 inches x 12 inches opening) exists in the asphalt or pavement near the service rise, a CGI reading performed in conjunction with a bar hole placed near the riser is necessary.
* Record bar hole readings, manipulate data, and use diagnostic tools to analyze gas concentrations.
Bar hole readings in either lower explosive limit or percent gas scales are recorded on the pen- based computer.
Each bar hole, for example, is assigned one of ten symbols depending on its latest reading.
The operator can direct a steady flow of air down the bar hole or a quick burst if needed.
After the surface hole has been created, the sinker drill is retracted and swung out of the way so the auger can be fed directly into the bar hole. The powerful auger function handles most soils, frozen or not, with ease due to its 960 ft/lb of maximum torque, 162-rpm maximum speed and 7,600 lb of pull-up and -down.
Ergonomic tommy bar holes make assembly easy and eyebolts are included for nut models over 30 kg.The smooth bore NHL nuts are used extensively in heavy industry and shipyards for mounting bearings, gears or propellers on tapered shafts.
Bar holes suggest the tower could be secured against attackers.
The probe sensor makes the detector suitable for use around gas meters, bar holes, furnace pipes, storage tanks, and survey sites.