Chemical Engineering June 2011 - 44

Engineering Practice
NomeNclature
AM Amortized cost per unit length of
pipe, $/ft
CD Cost per unit length of pipe, $/ft
CP
F
Total capital cost per unit length of
pipe, $/ft
Pipe fitting cost per unit length of
pipe, $/ft
G Maintenance cost per unit length of
pipe, $/ft
g
h
Acceleration due to gravity, ft/s2
Height inside V-1, ft
The following conclusions can be
made from the discussion above:
1. The line size full of liquid will always
be smaller than the self-venting
line.
2. The work described in Refs. 2 and 4
are based on small lines (up to 4-in.
nominal bore).
3. If liquid flow varies during
operation, the pipe should be sized
to accommodate the maximum
possible flow.
D Initial pipe dia., in.
D'
Optimum pipe dia., in.
D " Dia. of self-venting line, in.
P0, P1, P2 Pressure shown in Fig. 1, psig
T0, T1, T2 Temperature shown in
Figure 1, °F
V Velocity of the liquid through the
pipeline, ft/s
X Cost per unit length of 2-in. nominal
bore pipe of the same material
and schedule, $/ft
4. D′′ obtained from Equation 5
should be rounded off to the higher
nominal bore of pipe of standard
available size.
n
Edited by Suzanne Shelley
References
1. Yu, F.C., Hydrocarbon Proc., Nov. 1997.
2. Simpson, L.L., Chem. Eng., June 17, 1960, p. 191.
3. Moharir, A.S., Pipe hydraulics and sizing, IIT
Bombay, May 7, 2008.
4. Borghei, S.M. Partial reduction of vortex in vertical
intake pipe, Scientiairanica, Vol 17, Issue 2.
Authors
Tamagna Ukil is the Manager
of PTA-Process at Reliance
Industries Ltd. (Reliance
Corporate Park, Ghansoli, 7-B
Ground Floor, Navi Mumbai
Maharashtra, India; Phone:
+912-244-783-452; Email:
tamaga.ukil@ril.com). He
holds a B.S.Ch.E. from Utkal
University. He is a Certified
Piping Engineer from
IIT Bombay, and has been
working with Reliance Technology Group, PTA
Division, to provide advanced technical services
in the field of design, simulation and process
optimization for the manufacture of purified
terephthalic acid (PTA).
Thomas Mathew is president
of Reliance Industries
Ltd. He graduated as a Chemical
Engineer from Kerala
University (Trichur Engineering
College), and spent the
first 16 years of his career
involved in the production of
ammonia from numerous raw
materials, including natural
gas, naphtha, fuel oil and coal.
Mathew participated in the
startup of two coal gasification plants and served
as plant manager for five years in the coal gasification
plant at Ramagundam, India. He joined
Reliance in 1985 and took charge of the commissioning
and startup of several petrochemical
plants, before heading the manufacturing operations
of the Reliance's Patalganga Complex. He
leads the Centre of Excellence in PTA and Gasification
within Reliance.
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Chemical Engineering June 2011

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