Document 7x14vR7VkjoqYLzkMmea83Qo
1988 CAPITAL BUDGET
Lake Charles VCM Plant
H-101 Control Revisions
$100,000 Capital
Project Description
i>
siCpt
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ti'fi
Space
his economic project provides recirculation of the cooling
iwater used in H-101, the Direct Chlorination Reactor Cooler,
to increase the shellside cooling water velocity and provide
temperature control on R-101, the Direct Chlorination
Reactor. The project includes installation of a cooling
water recirculation line, a recirculation pump, and a
temperature control valve.
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Problem Description
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In August, 1986, H-101 developed^ tube leak^ resulting in^ft-
onvironmontal incident and making replacement necessary. The
exchanger historically has failed .approximately every 30 months. Failure is ^caused-feyKlerosionjjon the process tube}
side and--shall side-cafrosion cau3erdr"Ey pitting. The process
side tgorrosioiy^is allowed to occur intentionally, as the
tubes arS--sacrificed to provide iron for ferric chloride,
which catalyzes the chlorination reaction.
Sacrificial
ferrules were installed in the tops of the exchanger tubes during the May 1987 turnarounds--These--wiUl'protect the tubes
from process side corrosion while still providing ferric
chloride.
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Cooling water is currently supplied to the shellside of H-101
without temperature control by the main cooling water supply header. The cooling water lines supply approximately 6700 gpm to the shell side flow velocity of 2.7 ft/sec. A minimum
velocity of 3 ft/sec. is recommended to minimize shellside
pitting, which leads to premature tube failure. A shellside , .. cooling water velocity of 4 ft/sec. can be obtained and-f*' j'lWW'W
^jroqui-r-ing. a cooling water flowrate of 9000 gpm. This project will supply 9000 gpm cooling water to H-101 by recirculating
pul Lluji ul the cooling water^rcturn back--to the--supply,-
thus reducing shellside pitting and extending the life of the
exchanger to four or more years/
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The project will also provide temperature control for R-101,
the Direct Chlorinator Reactor.
In the past, the cooling
water flow to H-101 has sometimes been "pinched back" during
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the winter months to maintain the reactor temperature at 55C. However, the resulting cooling water velocities in
H-101 are very low, making it-^susceptible to pitting.
In
recent years, the cooling water valve has been left wide
open, resulting in reactor temperatures of 45-50C. At these
lower
temperatures
increased
concentrations
of
1,1,2-trichloroethane, an unwanted by-product, are formed in
the reactor.
This project will control operation at the
desired temperature of 55C while maintaining an adequate
flowrate of cooling water to H-10'l to minimize corrosion due
to pitting.
/
Project Alternatives
The following alternatives were considered:
/ 1)
Modify tfce tube pitch and the number of baffles in H-101
to give a more even velocity profile,
thereby
eliminating "dead zones" which are highly susceptible to
"pitting^ -assl raise overall cooling water velocity.
This alternative was rejected because it would require
installation of a new exchanger and it would not provide
the benefits of temperature control.
2) Install a closed cooling water system which would allow
.other water treatment systems such as chromate treatment to be used and^ allow leaks to be contained ii*- lliu Qloaed
srrr. --wtion--was--r^j^r-t-od due to the-^hXghT^
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Project Till* Location _ Department. Checked By
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DESCRIPTfON
EQUIPMENT
Pressure Vessels Towers & Internals Exchangers Pumps & Compressors Furnaces
VIS1A
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vista Chemical Company
GENftA( ENGINEERING HOUSTON. TEXAS
Estimate Summary
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W. 0. No. Sheet No.
Estimator. Approved By.
Class of Estimata - Nelson Refinery Index. % Quoted ________
Capacity Original Oate. Rev. Nn
LABOR MH $
MATERIAL
$
SUBCONTRACT $
Of.
Oats. :-v t'
TOTAL
%
a c 0C
r 12 0 0 0
TOTAL EQUIPMENT
OTHER MATERIALS
Piping Instruments Electrical Structural Concreta & Site Inaulation Painting Fireproofing Buildings
TOTAL OTHER MAT.
TOTAL DIRECT COST
FIELD COST
HOME OFFICE COST
JBONO, ARI. SALES TAX ^ .
ESCALATION
7 :-V.,
1" JACONTINGENCY
TOTAL
SEPT. 1984
c d(
L5c Z 2l00 2 3 00 1 50 8
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7 c L i
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5 y0 3 2 r0 0
5d 3
2 8 SU 0
0 rc C
z00
2500
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$3 0 s 0 (j V,
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