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if a dp transmitter has range 100 in H2O and flow is 20mmcf
and if the flow is changed to 25 mmcf then what is the
formula to determine new range of transmitter
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Answer Posted / carl_ellis
design max flow rate = 20 mmcf
design max DP = 100 in H2O
new max flow rate = 25 mmcf
new max flow rate = ?
The max flow rate increases by 125% over the design max flow
rate:
25/20 = 125% increase
DP calculations are done in normalized percentages. 125% = 1.25
To calculate the corresponding DP at a max flow rate 125%
higher than the original, where X = DP
sq rt of X = 1.25 (square root of normalized percentage
of DP)
X = 1.25^2 = 1.562
1.562 = 156.2% (work in normalized percentage)
156.2% of 100 inH2O = 156.2 in H2O at a max flow rate of 25 mmcf
Carl Ellis
Measure First
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