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Taylor-Wharton MicroBulk MB-450, Инструкция по установке и эксплуатации, Страница: 11 / 27

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BT- 434 Rev.A

11

 Pressure Building Circuit

The pressure building circuit serves to build pressure after filling the vessel. The circuit is also used to 

ensure sufficient driving pressure during high product withdrawal periods. Opening the pressure build

-

ing circuit valve (V-4) permits the circuit to function. A stainless steel tag labeled “P.B.” is attached to 

the valve. When the pressure inside the vessel drops below the pressure builder setting, the pressure 

building stage of the pressure building/economizer regulator (PCV-1) opens. This creates a path from 

the liquid in the bottom of the container to the gas space in the top. This path contains an internal 

pressure building coil (PBC-1) to vaporize product as it flows from the bottom to the top of the vessel. 

Liquid is expanded to a vapor and pressure is increased in the vessel. The pressure building coil is at-

tached to the inside surface of the vacuum jacket.

Pressure Building Circuit

Figure 4-Pressure building circuit highlighted in blue.

V-4

PCV-1

Содержание MicroBulk MB-450

Страница 1: ...nd these instructions Refer to the Taylor Wharton s Safety First booklet TW 202 for handling cryogenic material Do not permit untrained persons to use or maintain this equipment If you do not understand these instructions contact your supplier for additional information www taylorwharton com MicroBulk BT 434 REV A ...

Страница 2: ...conomizer Circuit 13 Safety Devices 14 Instrumentation Circuits 15 OPERATION 16 Receiving Inspection 16 Handling 16 Customer Installed Equipment Piping 16 Filling by Pressure Transfer 16 Filling by Pump Transfer 17 Filling for Road Transport 17 Withdrawing Gas 17 Withdrawing Liquid 18 Changing Gas Service 18 MAINTENANCE 19 Leak Test 19 Globe Valves 19 Regulator 19 Instruments 21 Checking Vacuum 21...

Страница 3: ...le materials Keep Combustibles Away from oxygen and eliminate ignition sourc es Many substances that do not normally burn in air require only a slight spark or moderate heat to set them aflame in the presence of concentrated oxygen Oth er sub stances which are only moderately combustible in air can burn violently when a high percentage of oxygen is present Do not permit smoking or open flame in an...

Страница 4: ...nce with Compressed Gas Association CGA Pamphlet G 4 1 Cleaning for Oxygen Service or equivalent industrial cleaning specifications Observe Safety Codes When Locating Oxygen Equipment Before locating oxygen equipment become thoroughly familiar with National Fire Protection Association NFPA Standard No 50 Bulk Oxygen Systems and with all federal state and local safety codes The NFPA Standard covers...

Страница 5: ...out adequate ventilation the expanding nitrogen will displace the normal air resulting in a non life supporting atmosphere Dispose of Waste Liquid Nitrogen Safely Dispose of waste liquid nitrogen out of doors where its cold temperature cannot damage floors or driveways and where it will evaporate rapidly An outdoor pit filled with clean sand or gravel will evaporate liquid nitrogen safely and quic...

Страница 6: ...ulated with a micro fiberglass aluminum foil radiation shield Both the inner pressure vessel and vacuum jacket are constructed of type 304 stainless steel Models are available designed and con structed in accordance with DOT 4L or ASME Section VIII The DOT 4L vessels may be legally transport ed by truck in the United States while containing product Piping circuits allow the vessel to vent fill pre...

Страница 7: ...ner Bursting Disc psig 356 525 750 kPa 2 455 3 620 5 171 Road Relief Valve psig 22 22 22 kPa 152 152 152 Pressure Control Devices Economizer Setting psig 200 325 420 kPa 1 379 2 241 2 896 Pressure Building Setting psig 175 300 400 kPa 1 207 2 069 2 758 Gaseous Capacity NPT1 Nitrogen cu ft 9 250 8 750 7 687 cu M 262 248 218 Oxygen cu ft 11 400 11 000 10 208 cu M 323 312 289 Argon cu ft 11 000 10 70...

Страница 8: ...VC 1 CV 1 FS V 1 V 5 V 4 V 3 V 1 LI 1 PI 1 R 1 R 2 V 2 SV 1 SV 2 PBC 1 PCV 1 CN 2 CN 1 CN 3 CN 4 Legend CN 1 Connection Liquid Fill Withdrawal LI 1 Liquid Level Gauge CN 2 Connection Full Trycock Vent PI 1 Pressure Gauge CN 3 Connection Pump Top Fill PBC 1 Pressure Building Coil CN 4 Connection Gas Withdrawal VC 1 Vaporizer Coil V 1 Valve Liquid Fill Withdrawal PCV 1 Pressure Building Regulator V ...

Страница 9: ...ent trycock valve V 2 is attached to a vertical tube in the upper portion of the vessel The open end of the tube is positioned at 90 liquid level based on the vessel volume Opening the vent valve reduces pressure in the vessel during filling It also severs as a full trycock venting liquid from the vessel when the liquid level exceeds 90 A tag labeled VENT is attached to this valve Fill and Vent Ci...

Страница 10: ...e CV 1 prevents product from escaping the vessel A fill stop valve FSV 1 within the vessel prevents over filling This device functions when filled by the Microbulk Truck in automatic fill mode The fill stop valve will not function when the vessel is filled by a typical cryogenic pump Fill Circuit Figure 3 Fill circuit highlighted in blue CV 1 CN 3 ...

Страница 11: ...l drops below the pressure builder setting the pressure building stage of the pressure building economizer regulator PCV 1 opens This creates a path from the liquid in the bottom of the container to the gas space in the top This path contains an internal pressure building coil PBC 1 to vaporize product as it flows from the bottom to the top of the vessel Liquid is expanded to a vapor and pressure ...

Страница 12: ...he pressure within the vessel to flow through the vaporizer VC 1 The vaporizer uses heat from the ambient air to convert the liquid into a gas and warm it The vaporizer like the pressure building coil is attached to the inside surface of the vacuum jacket The vaporizer is located in the upper of the jacket the pressure builder in the lower Gas Withdrawal Circuit Figure 5 Gas withdrawal circuit hig...

Страница 13: ...ithin the vessel exceeds the economizer setpoint The economizer setpoint varies depending on the model This allows gas from the top of the vessel to flow into the vaporizer circuit Provided that gas from the vaporizer is being withdrawn for use the vessel pressure will be reduced The primary safety valve SV 1 will be prevented from opening avoiding product loss Economizer Circuit Figure 6 Economiz...

Страница 14: ... The rupture disc requires replacement in the event a safety valve malfunctions and allows vessel pressure to reach the burst pressure rating A relief valve SV 2 set to open at 22 psig is provided on the DOT models Closing the isolation valve V 5 prevents flow through the relief valve This feature is useful if it is necessary to transport the MB 450 at a reduced pressure It also allows liquid to b...

Страница 15: ...e difference in pressure between the top and bottom of the vessel Product within the vessel creates a higher pressure at the bottom of the vessel than at the top Readings on the liquid level gauge are in inches of water This reading when compared to the contents chart attached to the front of the vessel allows accurate monitoring of the amount of product within the vessel Instrumentation Circuits ...

Страница 16: ...rt operate and store the unit in the vertical position Never place the unit on its side Important When lifting by crane use the lift eyes provided on the top of the jacket Never lift the unit over head When installing the MB 450 for remote filling be sure to follow accepted design practices for cryogenic equipment All equipment must be cleaned for oxygen service Be sure to include pressure relief ...

Страница 17: ...ent valve V 2 should remain open during the fill Moni tor the product exiting the vent valve closely When liquid issues from the vent valve V 2 immediately stop the pump Once liquid stops issuing from the vent valve close the vent valve The DOT 4L design vessels may be transported over the road while containing product When filling these vessels for transport it is recommended that they be placed ...

Страница 18: ...vacuum pump The ultimate vacuum reading should be at least 20 inches of mercury 4 Replace the fittings for the vent liquid and use connections with the appropriate fittings shown in the chart below Use Teflon tape or another suitable thread sealant when threading the fittings into the connections 5 Remove any decals identifying the previous gas service Attach new gas service identification decals ...

Страница 19: ...anual for assistance in troubleshooting Figure 9 Inspection and Repair Log Sample Form Leak Test Globe Valves Regulator After making repairs requiring disassembly or replacement of components leak test all valves or piping joints that were taken apart and reconnected Apply leak detector fluid to the test surface Large leaks instantly form large bubble clusters while fine leaks produce white foam t...

Страница 20: ...Pressure Gauge Regulator High Pressure Cylinder Figure 10 Regulator bench adjustment fixture 1 Leak test joints between the high pressure cylinder regulator and the dump valve Joints must be leak free before proceeding 2 Close the on off valve and the dump valve 3 Open the high pressure cylinder valve 4 Set the high pressure regulator above the desired set point for the pressure builder 5 Slowly o...

Страница 21: ...the vacuum maintenance system becomes saturated it can no longer maintain the vacuum integrity of the container The change will be very gradual and may go unnoticed for several years When the vacuum in the insulation space is no longer effective the following symptoms may appear 1 With liquid in the container the outer casing will be much colder than comparative containers 2 Frost indicating the l...

Страница 22: ...ly N E R Weight Step 4 Weight Step 5 Time between Step 3 and 4 in hours X 24 If it has been determined that the vessel has a vacuum problem it will be necessary to repair and re evacu ate the vessel A skilled service technician should perform vessel repair Contact Taylor Wharton custom er service at 1 800 898 2657 for assistance in locating the closest service center MAINTENANCE ...

Страница 23: ... coils 2 Excessive system pressure a Extensive shutdown time a No remedy b Low withdrawal rate b No remedy c Malfunction of pressure build ing circuit c Adjust pressure building regu lators Replace if necessary d Malfunctionofpressuregauge d Replace gauge e Bad vessel vacuum e Perform NER test Have vessel repaired and re evacuated if necessary 3 Leaking relief valve a Dirt or ice in valve a Thaw o...

Страница 24: ...si Vessel 7702 6196 Pressure Gauge 400 psig PI 1 350 500 psi Vessel 1706 9C14 Pressure Gauge 600 psig PCV 1 250 psi Vessel 85368135 Regulator P B Economizer 175 psig PCV 1 350 psi Vessel 6999 9018 Regulator P B Economizer 300 psig PCV 1 500 psi Vessel 8816 1060 Regulator P B Economizer 400 psig SV 1 250 psi Vessel 85440299 Relief Valve MNPT 250 psig SV 1 350 psi Vessel 85450309 Relief Valve MNPT 3...

Страница 25: ...BT 434 Rev A 25 APPENDIXES Appendix 1 MB 450 General Arrangement ...

Страница 26: ...BT 434 Rev A 26 APPENDIXES ...

Страница 27: ...BT 434 Rev A 27 P N BT 434 Rev A Publication Taylor Wharton Cryogenics LLC 4075 Hamilton Boulevard Theodore AL 36582 Phone 251 443 8680 Phone 800 898 2657 www taylorwharton com ...

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