Document B8oZJeowLNdOvd4bR69DpVM2j
ABD00200502
PROCESS DESIGN EMISSION RECOVERY SYSTEM REVISION NO. 3 T-702 SEAL WATER LEVEL CONTROL REVISIONS
MARCH 8, 1979
APPROVED BY:
R. A. Frohreich Process Engineer
ABD00200503
EMISSION RECOVERY SYSTEM REVISION NO, 3 T-702 SEAL WATER LEVEL CONTROL REVISIONS
TABLE OF CONTENTS I. PURPOSE OF DESIGN II. PROCESS DESCRIPTION III. INSTRUMENT SPECIFICATIONS IV. WORK LIST V. DRAWING
A
ABD00200504
EMISSION RECOVERY SYSTEM REVISION NO. 3
T-702 SEAL WATER LEVEL CONTROL REVISIONS
PURPOSE OF DESIGN
The purpose of this design is to revise the seal water level control system in the Emission Recovery System to assure more efficient operation and to minimize operator attention.
The level in the vacuum pump seal wateT separator, T-702, in the Emission Recovery System often drops to the point that the seal water pump loses suction pressure. The vacuum pump and compressor continue running, but efficient operation is not possible without seal water. Restoration of the level requires that the HPSW make-up valve be opened manually by the field operator.
The loss of level in T-702 can be caused from leaks and losses of seal water in the seal water system. One major seal water loss occurs when T-702 periodically drains to either T-701, the inlet knockout drum, or the old blowdown tank via CV-716. CV-716 is actuated by the middle level switch on the level well for T-702. The position of the switch allows very little tolerance for water addition to the system before opening CV-716. CV-716 is opened regularly because excess water periodically enters T-702 via CV-703 while CV-703 is closing. CV-703 allows water to periodically drain from T-703, the compressor seal water separator, to T-702, and closes very slowly. During the time it closes, approximately 30-40 gallons of excess water drains into T-702, causing the level switch to open CV-716.
This design will provide for make-up water to be automatically added to T-702 when the water level falls below the bottom level switch. Water losses will be minimized by raising the switch that activates CV-716. Water losses will also be minimized by replacing the sole noid valve on CV-703 with another solenoid valve having a larger orifice size, so that CV-703 will close faster.
ABD00200505
EMISSION RECOVERY SYSTEM REVISION NO, 3
T-702 SEAL WATER LEVEL CONTROL REVISIONS
II. PROCESS DESCRIPTION
Liquid, which is essentially water, flows into the existing vacuum pump seal water separator, T-702, from the existing vacuum pump, P-704. T-702 is equipped with a level well which will sense the liquid level at three locations.
The existing high level switch, LS-702C, will sense a high liquid level and will open CV-716, the existing T-702 drain valve. CV716, will allow liquid to be pumped to T-701, the existing inlet knockout drum for the Emission Recovery System. The existing timer on the valve actuator is set to close the control valve 25 seconds after opening if the liquid level is below LS-702C. If the level is still above LS-702C, the valve will remain open until the level drops.
The existing low level switch, LS-702A, will sense a low liquid level in T-702 and open CV-702, the HPSW make-up valve. The HPSW make-up valve is an existing manual ball valve that is to be equipped with an actuator. A new ball valve will be installed in the HPSW make-up line ahead of CV-702 to be used if needed to shut off make-up water to the tank. CV-702 will close when LS-702B, the existing middle level switch, is activated.
In the event LS-702C malfunctions and T-702 fills with liquid, LS-702A, a new capacitance probe to be installed from the top of T-702, will be activated. LA-702A will shutdown the vacuum pump and compressors and will also activate the control room shutdown alarm. A level alarm located on the local panel will also be energized.
*
ABD00200506
EMISSION RECOVERY SYSTEM RECOVERY NO. 3 T-702 SEAL WATER LEVEL CONTROL REVISIONS
III. INSTRUMENT SPECIFICATIONS INSTRUMENT LIST
Item LA-r702A CV-702
Description Level Alarm Control Valve
Location T-702
Line l-WP-765
ABD00200507
^FEttny B323S
ENGINEERING CENTER
PONCA CITY, OKLAHOMA
SPECIFICATION SHEET
LIQUID LEVEL INSTRUMENTS
AFE. NO_______ _________________
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4 INSTRUMENT, TYPE
5 LOCATION 6 ELEMENT, TYPE
7 LOCATION
fi RANGE, INCHES
P/hA)(?L
CAf/KlTAfiJCe
r-702
9 INTERFACE
10 UPPER DENSITY, LB./CU. FT. 11 LOWER DENSITY, LB./CU: FT. 12 TEMPERATURE f
13 PRESSURE PSIC 14 VALVE TYPE
16 16 LOCATION 17 MATERIAL
1b BODY SIZE
PORT SIZE
19 PLUG FORM 20 &P | MIN, NOR. 1 MAX.
21 CALC. Cv
VALVE Cv
22 AIR TO OPEN OR CLOSE
11
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11 I
1
---------
1
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23 24 26 1 -^
r 29 30 31 32
MAXIMUM SHUTOFF ^ P
FLUID
TEMPE RATURE F
PRESSURE PSIG
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SP GR. AT STD. CONO.
SP. GR. AT P. & T.
WEIGHT * VAPOR IN-OUT
C PVISCOSITY AT P. & T,
RATE. NORMAL
^
ft
130 O
( 18)
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33 HATE
34 MAX 1 MIN.
36
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ABD00200508
CONOCO
PLANT
ENGINEERING CENTER
PONCA CITY, OKLAHOMA
SPECIFICATION SHEET
CONTROL VALVES
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PROJECT
DATE -JtMht
8. M. NO.
A. F, E. NO.
W. O. NO. _
INO NO.
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P. O. NO APP'O BY
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11
12
GENERAL n em no. a TAG SERVICE
1 1
3A
15
16
17
18
19
1 10
14
17'
LINE SIZE
MANUFACTURER
MODEL NO.'
rtPE
SERVICE CONDITIONS
FLUID
TEMP. 'F
NORMAL
MAX.
PRESS., INLET,,
AP
MIN.
NORMAL NORMAL
MAX. MAX.
MOLECULAR WEIGHT
A.P.I.
SP. GR ff 60'F.
0 F.T.
WEIGHT 7. VAPOR IN VISCOSITY p F T. a P.
OUT
RATE. NOR. LB; HR. (SPH) GPM
RATE. MAX . LB.iHR HCFMI GPM '
NORMAL FLOW Cv
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BOOY
BOOT SIZE
PORT SIZE
20 TYPE (.ANGLE OR GLOBE'
21 MATERIAL
22 END CONNECTIONS
BONNET
24
LUBRICATOR PACKING
ISO. VAL.
27 TRAVEL INDICATOR
n
TRIM TYPE INNER VAL. I NO. OF PORTS
30 PLUG & SEAT MATERIAL
31
TYPE
ACTUATOR
`Pftzu.M.A-TIC.
33 FAILURE POSITION
34
POSITIONER
Clou? o .Rem5
INPUT SIGNAL
OUTPUT SIGNAL
36 BYPASS
GAUGES
37 .MANUFACTURER
MODEL NO.
ACCESSORIES
30 SzLtHCiP l/U-LVC
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NOTES:
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--
CO VkLve 13 Extsr^G- /' ?W l/*Lve /n
t/ALt/s To Be M&u/ 'aoi?AJe-AJT >
flWA-TCfij $LQUTl/JC-
^cu-t'Alcto VrIve To IBc ItO V frC- ,
I ) INDICATES ITEM CHANGED ON LATEST REVISION. HI INDICATES MANUfACTUREH TO GIVE REQUESTED INFORMATION IN HIS QUOTATION.
HV. 7-24 60
SHEET .
OF___
ABD00200509
EMISSION RECOVERY SYSTEM REVISION NO. 3 T-702 SEAL WATER LEVEL CONTROL REVISIONS
WORK LIST
1. Install actuator on existing 1" HPSW make-up valve in 1-WP765-S-A2-3. Connect solenoid valve to electrical signals from existing LS-702A and existing LS-702B.
2. Move existing PG-702 to same nozzle as existing PS-702/PA-702 and install new LA-702A on vacant nozzle.
Note:
Nozzle that existing PG-702 is now on should be inspected to make sure LS-702A will go into the nozzle. If not, another nozzle may have to be welded onto T-702.
3. Install new ball valve in existing 1-WP-765-S-A2-3 upstream of new CV-702.
ABD00200510
EMISSION RECOVERY SYSTEM REVISION NO. 3 T-702 SEAL WATER LEVEL CONTROL REVISIONS
V. DRAWINGS
For P 5 I diagram, refer to Drawing No. MS-9226~42-lD,
Revision No.
.