Chemical Engineering September 2015 - 69

N
P = Np dD3N5
Re = d2
/m3 P = Np dD3N5
P /V = 2.45W /m3
N /µ
Re = d2
N5
µ
W /m3
Second, calculate the G.
N /µ
P /V = 2.45W /m3
Where:
Re = d2
N /µ
P /V = 2.45W /m3
Re = d2
N /µ
P /V = 2.45W /m3
Re = d2
P = Np dD3N5
Re = d2N /µ
Re = d2
N /µ
P /V = 2.45W /m3
P /V = 2.45W /m3
N /µ
Re = d2
P = Np dD3N5
P /V = 2.45W /m3
Second, calculate the G.
Third, calculate the mass flowrate.
Third, calculate the mass flowrate.
Example 2. Mass flowrate of vapor at 314.7 psia and
413°F with known upstream and downstream pressures.
Calculate the mass flowrate when the pipe inlet
pressure (P1) and outlet pressure (P2) are 250 psia and
100 psia, respectively. The piping system has a vertical
elevation rise of 20 ft. All input data and the results are
summarized in Table 1.
First, calculate the Pec. The Pec
calculation requires
average density and average specific volume. A Pec
value that is lower than 100 psia means that the system
is not choked.
P = Np dD3N5
P = Np dD3N5
Re = d2
N /µ
Where:
P /V = 2.45W /m3
Re = d2
N /µ
P /V = 2.45W /m3
Second, calculate the Pec. The higher Pec than the
vessel operation pressure of 14.7 psia means that the
flow is choked at 15.9452 psia. So, the pipe inlet pressure
should be calculated with the pipe outlet pressure
of 15.9452 psia.
Example 3. Inlet pipe pressure of vapor at 314.7 psia
and 413°F with known downstream pressure and
flowrate. Calculate the inlet pipe pressure when 20,000
lb/h vapor is flowing into a vessel operating at 14.7 psia.
The piping system has no vertical piping section. All input
data and the results are summarized in Table 1.
First, calculate the G.
ChemiCal engineering www.Chemengonline.Com september 2015
69

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Chemical Engineering September 2015

Table of Contents for the Digital Edition of Chemical Engineering September 2015

Contents
Chemical Engineering September 2015 - Cover1
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