condition existing when the flame resulting from the combustion of the fuel comes into contact with any interior surface of the furnace 

1. disc rim on the end of a pipe for coupling pipes together, usually by bolts.

2. projection of metal on formed objects.

3. parts of a channel at right angle to the central section or web. See also pipe fitting.

reduction in apparent sound transmission loss of a wall caused by being carried around the wall by other paths (structure-borne, leaks, etc.). See also duct breakout noise.

nut used to hold flared tubing on a flare fitting 

device for shaping the end of a ductile pipe or tube to increase its diameter to a shape suited for a flare fitting.

in a refrigerating system, a separating tank placed between the expansion device and evaporator to separate and bypass any flash gas formed due to pressure reduction.

1. lowest temperature to which a product must be heated for its vapors to ignite in the presence of a flame when operating under standardized conditions. Compare fire point.

2. in a vacuum cooling chamber, that pressure corresponding to the vapor pressure at the product temperature and below which water vaporizing commences.

3. in a piping suction, the pressure below which the liquid will flash into vapor.

partial or total vaporization obtained by sudden reduction of pressure