Upload
mauriciojj
View
664
Download
97
Embed Size (px)
Citation preview
1
EBD-1500 SERIES INSTALLATION INSTRUCTIONS
11.7"
7.25"
4.2"
EBD-1500
(NATCO part no.48126009) The EBD-1500 Entrance Bushing is a 1½” NPT bushing designed to transfer up to 30,000 volts into crude oil electrostatic dehydrator and desalter vessels. This bushing has undergone continuous improvements in design and materials to optimize its electrical and mechanical performance. To complete the entrance bushing installation, a special corona resistant Teflon insulated HV (high voltage) cable is needed to connect the bushing to the transformer. It is recommended that the cable be installed inside two PFA sleeves. The PFA sleeves will add additional electrical insulation and move the cable toward the center of the conduit. Centering is important to reduce electrical stress points along the cable.
CAUTION!!!
Only qualified personnel should install or service high-voltage transformers or other electrical equipment on NATCO Electrostatic Dehydrators or Desalters. Incorrect installation of electrical equipment may result in personal injury, damage to parts or process failure. For additional information concerning electrical or mechanical component installation on NATCO equipment, contact NATCO Engineering Department, Houston, Texas or the nearest NATCO Branch Office.
11.7"
14.0"
10.5"
EBD-1500S
(NATCO part no.48126008) The EBD-1500S Entrance Bushing includes a 1” NPT x 1½” NPT x 10½” long swage. The swage permits the EBD-1500 bushings to be used with older process vessels, ie, 1” NPT entrance bushing connections. The swage extends the entrance bushing into the liquid phase of the process. This is very important because corona (ionized gas) present in the gas phase of electrostatic coalescers will attack Teflon and other materials used in the construction of entrance bushings.
2
INSTALLATION INSTINSTRUCTIONS 1. Remove the entrance bushing from shipping crate. Be careful not to damage the insulating surfaces of the entrance bushing. 2. Before screwing the entrance bushing into the mounting flange inspect all connecting threads including the pipe extension (and the swage if it is an EBD-1500S). Make sure they are clean and not damaged. Apply a non-conductive thread sealer to both sets of threads and a layer of Teflon tape to the bushing threads. 3. Tighten all threaded connections, including the bushing to swage. Because pipe wrenches tend to distort a pipe, experience has shown that after the initial tightening it is a good idea to set the assembly aside for 10-15 minutes and then retighten. This helps avoid any leaks around the threads. Any leak will contaminate the transformer oil and will result in a premature failure of the entrance bushing or transformer components. 4. Place a new flange gasket on the vessel entrance bushing nozzle flange and pull the 3/16” stainless steel cable through the nozzle and gasket. The lower end of the cable should be connected to the top end of the electrode contact rod on the appropriate electrode set inside the vessel. Connect the other end of the cable to the lower end of the entrance bushing. Place a 7/16” back-up wrench on the flat part of the connecting rod while tightening the bolt until firm. 5. Carefully insert the entrance bushing through the nozzle and bolt the flange into place. Insert the 5/8” ID x 3/4” OD PFA sleeve into the entrance bushing, allowing it to extend up and out of the flange as shown on the right. 6. Slip the conduit or flexible hose over the PFA sleeve. The PFA sleeve must pass completely through the conduit and be long enough to extend into the diode housing (or transformer housing if it is an AC coalescer). 7. Connect the conduit to the diode or transformer housing. Trim the PFA sleeve so it extends at 2”- 4” inside the housing (see pages 3 and 4). 8. Slip the 5/16” ID x 7/16” OD PFA sleeve over the high voltage cable and slide it up against the banana plug. Insert the PFA/HV cable combination through the 3/4” PFA sleeve, pushing the banana plug into the entrance bushing receptacle. To be sure the banana plug is firmly seated, gently unplug it, pulling on the HV cable, and then reinsert it by pushing on the 7/16” PFA sleeve. You should feel some resistance in both directions. 9. Attach the high-voltage cable to the appropriate polarity on the diode pack (see page 3 and 4) or to the transformer HV winding if it is an AC coalescer. 10. Refill the diode or transformer housing to the proper level with clean, dry transformer oil. Be sure there is no air trapped in the conduit or tubing that could become ionized by the high voltage. It is also a good policy to allow a little time for any air trapped in the transformer winding to be displaced. Replace the cover and follow normal start-up procedures.
3/16" stainless steel cable
1" extension nipple if required
Mounting flange
Electrodecontact rod
Normal crude oil level
Adapter swage
Cable weight
Vessel shell
Entrance bushing
1" conduit orflexible SS hose
3/4" PFA sleeve
7/16" PFA sleeve
HV cableNote: Conduit and swage should be filled with transformer oil.
EBD-1500S INSTALLATION
3
TYPICAL NATCO CANADA EBD-1500 ENTRANCE BUSHING INSTALLATION
Ground wire
Diodehousing
Low-voltagejunction box
2" Flange extension
Pressure-tightstainless steel hoseLight fixture
4" Mounting flange
Circuitbreaker
CAUTIONHIGH VOLTAGE
Conduit seal
Caution sign
Voltmeter
Oil level
NOTE:Be sure the white insulating portion of the entrance bushing is extended into the oil phase far enough to remain covered when the grounding float ball is in the low (shorted) position.
High-voltage cable
Diodepack
AC
DC
Diode boxrelief valve
1" Connection
Conduit seal
3/16" stainlesssteel cable
Vessel shell
Entrance bushingElectrode hanger
Contact rod
Positive (+)Electrode assembly
Negative (-)Electrode assembly
Normal crude oil level
5/16" x 7/16"PFA sleeve
5/8" x 3/4"PFA sleeve
Transformer/ Reactor tank
Cable weight
Both the (+) and (-) DC electrodes are similarly connected to their respective polarities on the diode pack.
Grounding float low level
7/16" PFA Sleeve
Low crude oil level
Groundingfloat assembly
4
TYPICAL NATCO USA
EBD-1500S ENTRANCE BUSHING INSTALLATION
Ground wire
Diode housing
Low-voltagejunction box
Special swage extension 1" NPT x 1-1/2" NPT
Pressure-tightstainless steel hoseLight fixture
4" Mounting flange
Circuitbreaker
CAUTIONHIGH VOLTAGE
Conduit seal
Caution sign
Voltmeter
Oil level
High-voltage cable
Diodepack
AC
DC
Diode boxrelief valve
1" Connection
Conduit seal
3/16" stainlesssteel cable
Vessel shell
Entrance bushingElectrode hanger
Positive (+)Electrode assembly
Negative (-)Electrode assembly
Normal crude oil level
5/16" x 7/16"PFA sleeve
5/8" x 3/4"PFA sleeve
Transformer/ Reactor tank
Cableweight
NOTE:Be sure the white insulating portion of the entrance bushing is extended into the oil phase far enough to remain covered when the grounding float ball is in the low (shorted) position.
Both the (+) and (-) DC electrodes are similarly connected to their respective polarities on the diode pack.
7/16" PFA Sleeve
Grounding float low level
Low crude oil level
Contact rod
Groundingfloat assembly
5
EBD-1500S INSTALLATION
WITH ISOLATION AT THE DIODE BOX
Ground wire
High-voltagediode housing
Low-voltagejunction box
3/16" stainless steel cable
Vessel shell
Entrance bushing
1" extension nipple if required
Pressure-tightstainless steel hose
Light fixture
Mounting flange
Electrode hanger
Positive (+)Electrode assembly
Circuitbreaker
CAUTIONHIGH VOLTAGE
Conduit seal
Caution sign
Voltmeter
Negative (-)Electrode assembly
Oil level
Normal crude oil level
High-voltageconnection
TI-23 withRajah connector
Diodepack
AC
DC
Conduit fill cap
Conduit seal
EBD-1500S Entrance bushing
5/8" x 3/4"PFA sleeve 5/16" x 7/16"
PFA sleeve
Adapter swage
3"x 1" NPTadapter swage
5/16" x 7/16"PFA sleeve
5/8" x 3/4"PFA sleeve
Transformer/ Reactor tank
Cable weight
NOTE:Be sure the white insulating portion of the entrance bushing is extended into the oil phase far enough to remain covered when the grounding float ball is in the low (shorted) position.
Both the (+) and (-) DC electrodes are similarly connected, through the TI-23, to their respective polarities on the diode pack.
Contact rod
Grounding float low level
Groundingfloat assembly
Electrode grounding level
6
EBD-1500 AND EBD-1500S
OPERATING SPECIFICATIONS
The EBD-1500 was extensively tested at the NATCO R&D Lab in Tulsa, Oklahoma. Tests included pressure/temperature tests as well as electrical tests. It was electrically tested to 60,000 volts AC and DC over an extended period of time without failure. The EBD-1500 Entrance Bushing is rated for continuous operation at 30,000 volts AC or DC.
Extensive tests were conducted with the entrance bushing submerged in heavy crude (8 API) oil/water emulsions without tracking. Extensive temperature and pressure testing has determined a safe operating range for the bushing. The chart below gives the recommended pressure/temperature specifications for the EBD-1500 and EBD1500S entrance bushings.
0
100
200
300
400
500
600
700
120
Pres
sure
(PS
IG)
Temperature (deg.F)
EBD- 1500 OperatingPressure/ Temperature Curve
140 160 180 200 220 240 260 280 300 320 340
800
900
1000
1200
1300
1100