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___ is the placement of a device on an energy-isolating device, in accordance with an established procedure, ensuring that the energy-isolating device and the equipment being controlled cannot be operated.

The heat content of natural gas varies from 950 Btu to 1050 ___.

The most common fuel oil strainers are the T strainer and basket strainer.

___ pumps are often used as fuel-oil pumps and as pumps to add water treatment chemicals to a boiler.

___ is the placement of a device on an energy-isolating device, in accordance with an established procedure, ensuring that the energy-isolating device and the equipment being controlled cannot be operated.

The heat content of natural gas varies from 950 Btu to 1050 ___.

___ pumps are often used as fuel-oil pumps and as pumps to add water treatment chemicals to a boiler.

___ added to boiler water are used to turn scale-forming salts into a nonadhering sludge that stays in suspension in the boiler water.

A therm is equivalent to 100,000 Btu.

The most recent amendments to the Clean Air Act occurred in 1997.