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 TABLE 1-1.
Cost of Steam Leaks at 100 PSIG
SIZE OF
MBTU OF
TOTAL COST
TOTAL COST
S T E A M LOST
LEAK
$/MONTH*
$/YEAR*
836
8,360
100,200
1/2"
637
6,370
7/16"
76,440
470
4,700
56,400
3/8"
326
3,250
5/16"
39,000
1/4"
210
2,100
25,200
117
1,170
14,040
3/16"
6,300
62
1/8"
526
* S t e a m costs $10.00 per million B T U
5.1 Steam and Fluid Meterinq. Steam, too often, is metered only at the point
of production. For metering to be effective, meters are also required at the
plant, in the distribution system, and at the points of consumption. This ,
dispersed metering is necessary to meet the objectives of metering:
q Determine
plant efficiency
q Determine
distribution system efficiency
q Manage
the system
q To
bill users
5.2 Fluid Meters. The use of fluid meters to monitor steam is prevalent.
The various fluid meters are categorized by their operating principle:
positive displacement meters, differential pressure meters, velocity meters,
and open channel meters. Parameters metered are flow rate, velocity,
temperature, or pressure at specific places and times.
1-3
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