Burners usually consume from 25 to 100 per cent. more than their rated
consumption of gas, depending largely on the working pressure. The so-
called 1/2-foot burner when operated at pressures of from 20- to 25-
tenths inches water column (2 to 2-1/2 inches) is usually used with best
economy.
7. PIPING.--(_a_) Connexions from generators to service-pipes must
be made with right and left thread nipples or long thread nipples with
lock nuts. All forms of unions are prohibited.
(_b_) Piping must, as far as possible, be arranged so that any
moisture will drain back to the generator. If low points occur of
necessity in any piping, they must be drained through tees into drip cups
permanently closed with screw caps or plugs. No pet-cocks shall be used.
(_c_) A valve and by-pass connexion must be provided from the
service-pipe to the blow-off for removing the gas from the holder in case
it should be necessary to do so.
(_d_) The schedule of pipe sizes for piping from generators to
burners should conform to that commonly used for ordinary gas, but in no
case must the feeders be smaller than three-eighths inch.
The following schedule is advocated:
3/8 inch pipe, 26 feet, three burners.
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