DRAFT. Operating Procedures for the NPDGamma Liquid Hydrogen Target in TA-53, Building MPF-35

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/26/05 1 DRAFT Operating Procedures for the NPDGamma Liquid Hydrogen Target in TA-53, Building MPF-35 Version 0.03 November 26, 2005

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/26/05 2 Table of Content Table of Figures 3 Update/Revision Procedure 4 1. Introduction. 5 2. General Comments for Gas Handling Procedures.. 6 3. Emergency Operation of the Target 6 A. Evacuation and flushing of the target and lines with hydrogen 13 A.1 Initial state of valves.. 13 A.2 Evacuation and flushing of the target and lines with hydrogen. 14 A.3 First Time Evacuation of the Target Vessel 14 A. 4 Backfill of target cell with helium. 15 A.5 Second evacuation of target cell. 15 A.6 First backfill of target cell with hydrogen.. 15 A.7 Third evacuation of target cell 16 A.8 Second backfill of target cell with hydrogen.. 16 A.9 Fourth evacuation of target cell.. 16 A.10 Third backfill of target cell with hydrogen. 16 A.11 Final state of valves 18 B. Filling and Cooling the Target with Hydrogen 20 B.1 Initial state of valves.. 20 B.2 Filling and Cooling the Target with Hydrogen. 22 B.3 Final state of valves 24 C. Warming up the Hydrogen filled Target to room temperature. 26 C.1 Initial state of valves.. 26 C.2 Warming up the Hydrogen filled Target to room temperature.. 28 C.3 Final state of valves 29 D. Purging Hydrogen out from the Target Vessel and Filling the lines with Helium. 31 D.1 Initial state of valves.. 31 D.2 Purging Hydrogen out from the Target Vessel and Filling the lines with Helium 33 D. 3 Pumping Hydrogen out from the Target Vessel 33 D. 4 Final state of valves 35 E. Change of Empty Hydrogen Gas Cylinder 37 E.1 Initial state of valves.. 37 E.2 Change of Empty Hydrogen Gas Cylinder 39 E.3 Final state of valves.. 41

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/26/05 3 Table of Figures Fig. 1. The LH 2 target cryostat and relief system... 7 Fig. 2. The target vacuum system.. 8 Fig. 3. The target gas handling system.. 9 Fig. 4. The target hydrogen supply manifold 10 Fig. 5. The helium manifold.. 11 Fig. 6. Decision flow chart for the operation of the NPDGamma liquid hydrogen target in MPF-35 12

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/26/05 4 Operating Procedures for the NPDGamma Liquid Hydrogen Target in TA- 53, Building MPF-35: Update/Revision Procedure The NPDGamma Liquid Hydrogen Target Team Leader has a lead responsibility for initiating and coordinating reviews and updates to these operating procedures. 1. Minor administrative, organizational, and grammatical changes and error corrections etc. identified through a use of the procedures will be incorporated into the Procedures by the Team Leader. A summary of changes and revisions will be documented in the Change Log of this document. 2. Baseline changes or other major changes. If a baseline given in this document of the Procedures has been changed then the new procedure has to be approved as described in IWD #xyz ABC. Revision Date Description of Change Pages Signature changed 0.03 11/26-05 Baseline n/a SePe

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/26/05 5 1. Introduction The object of these operating procedures is a safe operation of the NPDGamma liquid hydrogen target in MPF-35 at TA-53. The highest level of the LH 2 Target safety is defined in the Integrated Work Document IWD #xyz ABC. The IDW defines target personnel, responsibilities like who authorizes personnel and work, and how to approve this document. The procedures of this document must be followed and the defined tasks can be performed only by authorized target operators. The authorization is given by the responsible line manager as discussed in IDW #xyz ABC. The operating procedures of this document are a part of the larger safety envelope of the NPDGamma Liquid Hydrogen (LH 2 ) Target defined by the IWD #xyz ABC. The NPDGamma Liquid Hydrogen Target consists of 16 liters of liquid hydrogen at temperature of 17-18 K, relief system, vacuum system, gas handling system, and gas manifolds for hydrogen, helium, and argon, and associated instrumentation. Figure 1 shows a diagram of the target cryostat and relief system, figure 2 shows the target vacuum system, figure 3 shows the target gas handling system, figure 4 shows the H 2 supply manifold, and figure 5 shows the helium manifold. If the hydrogen has a contact with air, large amount of stored energy which can have very destructive consequences, can be released. To make the possibility minimal for this occurance, the target system is properly designed, fabricated under quality controls and then thoroughly tested, and finally detailed operating procedures have been written. In shed, MPF-25, where the target system has been assembled for testing, the cryostat, relief system, gas handling system, and connecting lines are en to a tent which is ventilated by a fan to the outside of the shed. Hydrogen content in the tent and in shed is monitored by hydrogen sensors interlocked to target system. Also oxygen level in shed is monitored. The hydrogen supply system is located outside of shed. Abbreviations: CCC Cold cathode gauge CKV Check valve FM Flow meter MP Mechanical pump P Pressure transducer or gauge PT Pressure transmitter PR Pressure regulator RD Rupture disk RV Relief valve RGA Residual gas analyzer TP Turpo pump TRAP LN 2 cold trap

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/26/05 6 2. General Comments for Gas Handling Procedures The valves and components on the gas handling system have the following numerical distinctions: the valves and components dealing with hydrogen are carrying 1xxs, the valves and components related to the main vacuum carry 2xx, the second turbo station and RGA carry 3xx, 4xxs are used on the helium manifold, and 5xxs are used on the argon manifold. The first step in operating the target is the removal of air from the target and associated lines. To do this, the entire system is repeatedly evacuated and backfilled with helium gas to reduce a possibility of air and hydrogen mixture. Hydrogen gas maybe used for subsequent target vessel backfills. The procedure for purging the target cell is given in Procedure A Evacuation and flushing of the target and lines with hydrogen. The target may be filled and cooled after it has been evacuated and purged. The cool down procedure is described in Procedure B Filling and Cooling the Target with Hydrogen. Hydrogen from the hydrogen manifold is condensed in the target during a cool down. When the target vessel is full with liquid hydrogen and pressure regulated to 15~psig, the gas panel is valved off from both the hydrogen supply manifold and the target vessel. Preset target temperature is maintained by two cryo coolers and the target vessel is only connected to its relief path. 3. Emergency Operation of the Target In the event of a power failure, vacuum failure, or refrigeration failure, the liquid hydrogen in the target will warm up and start to evaporate and thus create a potentially hazardous hydrogen pressure in the target vessel and exhaust lines. The relief valve RV104 in the relief chamber provides for the hydrogen gas a safe relief path to the venting system which conducts the hydrogen to the outside of shed. RV104 is set to at a pressure of 32 psia. The next level of safety is the rupture disc RD101 which will burst at a pressure of 49 psid. A parallel vent path through MV130 is used to manually discharge the target against 2 psid of helium gas in the relief chamber connected to the vent stack through check valve CV101.

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/26/05 7 Fig. 1. The LH 2 target cryostat and relief system.

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/26/05 8 Fig. 2. The target vacuum system.

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/26/05 9 Fig. 3. The target gas handling system.

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/26/05 10 Fig. 4. The target hydrogen supply manifold.

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/26/05 11 Fig. 5. The helium manifold. The assumption is that the target system is assembled and then thoroughly vacuum tested. Figure 6 gives a decision flow chart that provides the mutual dependence of different procedures involved in the operation

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/26/05 12 Start Check individual target components Leak checking & purging Control & instrumentation Calibration of transducers Helium backfill Filling/purging the lines by various gases before target filling Pre-cool down safety checklist Target cool down without hydrogen Leak test and get required vacuum He signal in RGA or bad vacuum? YES No Condensing hydrogen into target vessel He or H2 leak? YES No Steady state operation Shutdown Normal shutdown Shutdown and controlled venting YES Planned shutdown? No Emergency shutdown YES Emergency? No Fig. 6. Decision flow chart for operating of the NPDGamma Liquid Hydrogen Target in MPF-35.

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/26/05 13 A. Evacuation and flushing of the target and lines with hydrogen A.1 Initial state of valves: In gas panel: V107.. V108.. PR105. V109.. V110.. V111.. V112.. V113.. V114.. V115.. V116.. V117.. V118.. V119.. V119A V120.. V122.. V123.. V124.. V125.. V126. V127.. V140.. V141.. In vacuum system: V201.. V204.. V205.. V206.. V207.. V302.. V306.. V307.. V129.. In hydrogen supply: V101.. V102.. V103.. V104.. V105.. V106.. V130.. V131.. V132.. Hydrogen bottles PR101.. PR102.. PR103.. PR104.. Helium bottle PR105.. V133.. V134.. V135.. V136.. In helium supply: Helium bottle V401... PR401. V402.. V403.. V404.. V405.. V406.. In argon supply: V501 PR501.. V502.. V503.. V504.. V505.. V506.. Pumps: MP101. not TP201.. MP201. TP301 not MP301.. not PT204. <10-4 Torr RGA.., on VC Target Operator Date

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/25/05 14 A.2 Evacuation and flushing of the target and lines with hydrogen 1. Confirm that all initial conditions given in the Procedure 1 are met. 3.Turn on mechanical pump MP101. 4. Open valves V108, PR105, V109, V110, V113, V114, V115, V117, V119, V119A, V120, V122, V123, and V124. 5. Make sure the hydrogen bottles and helium bottle in the hydrogen manifold are, then valve V131. 6. Open valve V141 to MP101. Gauge P104 will start indicate vacuum pump till pressure is xyz mtorr. 7. Open pneumatic valve V100, and valves V130, PR104, V131, V132, V102, V104, V106, V134, and V135. 8. Gradually helium regulator PR105 by turning its handle fully clockwise. 9. Gradually hydrogen regulators PR101, PR102 and PR103 by turning their handles fully clockwise. Wait until PT103, PT104, PT105, and PT106 reach 100 mtorr. A.3 First Time Evacuation of the Target Vessel 10. Gradually valve V125 and V126 to evacuate the target vessel and piping. Gauges P102, P103, P103A, P104, P105, P107, and P108 indicate vacuum and PT102, PT104, PT105, and PT106 will go to 100 mtorr. 11. Turn on Turbo TP301. 12. Wait for until the PT106 on MP101 reaches less than 100 mtorr and PT302 reaches 10-4 Torr. 13. Open valve V129 and V306 close valve V141, and wait for until PT302 reaches 10-5 Torr scale. 14. Monitor target vessel content with RGA. Save the data after a minute or so. 15. Sequentially close and re valves V135, V134, V132, V131, V125, V123, V122, V124, V120, V119A, V119, V117, V115, V114, V108, V107, and V126, to pump out a small dead space in each valve.

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/25/05 15 16. Close valves V108, V110, V129, and V306. 17. Close helium regulator PR104 by turning its handle fully counterclockwise. 18. Open the helium bottle valve V136 and adjust regulator PR104 to 0 psig. A. 4 Backfill of target cell with helium 19. Gradually valve V110 and V108 to fill the target with helium. 20. Close regulator PR104 when gauge P105 indicates about 0 psig. A. 5 Second evacuation of target cell 21. Gradually valve V141 to pump out the target vessel and lines. 22. Continue pumping on the target vessel and lines until TP106 on MP101 reaches 100 mtorr. 23. Close V141 and V129 and V306. 24. When PT302 reaches 10-5 Torr repeat step 14. with RGA above. 25. Close valve V129 and V306. 26. Close hydrogen regulators PR101, PR102, and PR103 by turning their handles fully counterclockwise and close valve V108, V110, and V132. 27. Open the hydrogen bottles valves V101, V103, and V105 and adjust regulator PR101 to 0~psig. A. 6 First backfill of target cell with hydrogen 28. Gradually valve V108 and V110 to fill the target vessel and lines with hydrogen. Gauges P102, P103, P104, and P105 and PT105 will go to about 0 psig. 29. Close valve V108 and V110 when gauge PT105 reaches 0 psig.

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/25/05 16 A. 7 Third evacuation of target cell 30. Gradually valve V141 to pump out the target vessel and lines. 31. Continue pumping on the target vessel and lines until PT106 on MP101's reaches 100 mtorr. 32. Close valve V141 and valve V129 and V306. 33. When PT302 reaches 10-5 Torr repeat step 14. with RGA above. 34. Close valve V129 and V306. A.8 Second backfill of target cell with hydrogen 35. Gradually valve V108 and V110 to fill the target vessel with hydrogen. Gauges P102, P103, P104, and P105 will go to about 0 psig. 36. Close valve V108 and V110 when gauge PT104 reaches 0 psig. A. 9 Fourth evacuation of target cell 37. Gradually valve V141 to pump out the target vessel and lines. 38. Continue pumping on the target vessel and lines until PT106 on MP101 reaches 100 mtorr. 39. Close valve V141 and valve V129 and V306. 40. When PT302 reaches 10-5 Torr repeat step 14. with RGA above. 41. Close valves V129 and V306. A. 10 Third backfill of target cell with hydrogen 42. Gradually valve V108 and V110 to fill the target vessel with hydrogen. Gauges P102, P103, P104 and PT105 will go to about 0 psig. 43. Turn off pump MP101 and vent it through V140.

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/25/05 17 44. Confirm that all final conditions for Procedure A are met. 45. Go to Procedure B to fill and cool down the target. Target Operator Date

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/25/05 18 A.11 Final state of valves: In gas panel: V107.. V108.. PR105. V109.. V110.. V111.. V112.. V113.. V114.. V115.. V116.. V117.. V118.. V119.. V119A V120.. V122.. V123.. V124.. V125.. V127.. V140.. V141.. P101.. 2-3 psid P102.. 0 psig P103 0 psig P103A. 0 pisg P104 0 psig P105 0 pisg PT101. 2-3 psid PT104. 0 psig PT105. 0 pisg PT103 0 psig PT105. 0 psig PT106.. <100 mtorr In vacuum system: V201.. V204.. V205.. V206.. V207.. V302.. V306.. V307.. V129.. P202 under vacuum PT204. <10-4 Torr PT201.. <10 mtorr PT301. <10 mtorr PT302. <10 mtorr In hydrogen manifold: V101.. V102.. V103.. V104.. V105.. V106.. V130.. V131.. V132.. P107.. 0 pisg P108. 0 psig Hydrogen bottles PR101.. PR102.. PR103.. PR104.. Helium bottle PR105.. V133.. V134.. V135.. V136.. In helium manifold: Helium bottle V401... PR401. V402.. V403.. V404.. V405.. V406.. P401.. 2-5 psid In argon supply: V501

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/25/05 19 PR501.. V502.. V503.. V504.. V505.. V506.. P501. Pumps: MP101. 5 psid not TP201.. MP201. TP301 MP301.. RGA.., on VC Target Operator Date

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/25/05 20 B. Filling and Cooling the Target with Hydrogen B. 1 Initial state of valves: In gas panel: V107.. V108.. PR105. V109.. V110.. V111.. V112.. V113.. V114.. V115.. V116.. V117.. V118.. V119.. V119A V120.. V122.. V123.. V124. V125.. V127.. V140.. V141.. P101.. 2-3 psid P102.. 0 psig P103 0 psig P103A. 0 pisg P104 0 psig P105 0 pisg PT101. 2-3 psid PT104. 0 psig PT105. 0 pisg PT103 0 psig PT105. 0 psig PT106.. <100 mtorr In vacuum system: V201.. V204.. V205.. V206.. V207.. V302.. V306. V307.. V129.. P202 under vacuum PT204. <10-4 Torr PT201.. <10 mtorr PT301. <10 mtorr PT302. <10-4 Torr In hydrogen manifold: V101.. V102.. V103.. V104.. V105.. V106.. V130.. V131.. V132.. P107.. 0 pisg P108. 0 psig Hydrogen bottles PR101.. PR102.. PR103.. PR104.. Helium bottle PR105.. V133.. V134.. V135.. V136.. In helium manifold: Helium bottle V401... PR401. V402.. V403.. V404.. V405.. V406.. P401.. 2-5 psid

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/25/05 21 In argon supply: V501 PR501.. V502.. V503.. V504.. V505.. V506.. P501. Pumps: 5 psid MP101. TP201.. MP201. TP301 MP301.. RGA.. not, on VC Target Operator Date

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/25/05 22 B. 2 Filling and Cooling the Target with Hydrogen 1. Procedure A has to be performed before performing Procedure B. 2. Confirm that all initial conditions for Procedure B are met. They are the same as the final conditions for procedure A. 3. The lines are full of hydrogen gas from all the way from the hydrogen manifold to the target vessel at about 1 atm absolute. Increase regulator PR101 to 10 psig. 4. Fill the liquid nitrogen dewar that contains the hydrogen cold trap and wait for steady state condition. 5. Close valve V110, V155, V119, V119A, V122, V123, and V124. This will force the hydrogen flow to be controlled by PR105. 6. Start the cool down process by switching on the cryocoolers and initiating the Precooler Procedure. The cooldown of the cryo coolers will take for several hours. If needed regulate the hydrogen flow to the target vessel with PR105 7. When the high pressure gauge on regulator PR101, bottle pressure, decreases below 200 psi PR102 and set its outlet pressure to about 10 psig. 8. Close regulator PR101 by turning its handle counterclockwise and close the bottle valve V101. 9. Repeat step 6. when needed with regulator PR103. 10. Repeat step 6. with regulator PR102. 11. The gas volume at STP is 13500 liters (16 liters of liquid) what needs to be condensed to the target vessel. 12. Close regulator PR103 and its bottle V105. 13. Close valve V126. 14.Dispose of the liquid nitrogen from the cold trap dewar and wait for the lines to reach room temperature. You can speed up the warm up with a heat gun. 15. Open valve V110 and PR105. 16. Start pump MP101 and valve V115 and V141 to pump the remaining hydrogen from the gas panel and supply lines.

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/25/05 23 17. Wait until PT106 on MP101 drops below 100 mtorr then close valves V115, V141, and V108 and V110. 18. Open the helium bottle by ing V134, V135, and V136 on the hydrogen manifold and its regulator PR104 setting the pressure to 10 psig. 19. Gradually valve V108 and wait until P105 shows 10 psig. 20. Close the regulator PR104 and the bottle by closing V136, V135, and V134. 21. Close valves V108, V109, V110, V114, and V117. At this stage the gas panel and the hydrogen supply line contain about 10 psig helium all the way to valve V126. 22. Turn pump MP101 off and vent it. 23. Check that all final conditions are for Procedure B are met. Have a nice production run! Target Operator Date

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/25/05 24 B. 3 Final state of valves: In gas panel: V107.. V108.. PR105. V109.. V110.. V111.. V112.. V113.. V114.. V115.. V116.. V117.. V118.. V119.. V119A V120.. V122.. V123.. V124. V125.. V127.. V140.. V141.. P101.. P102.. P103 P103A. P104 P105 PT101. PT104. PT105. PT103 PT105. PT106.. In vacuum system: V201.. V204.. V205.. V206.. V207.. V302.. 2-3 psid 10 psig 10 psig 10 pisg 10 psig 10 pisg 2-3 psid 10 psig 10 pisg 10 psig 15 psig 10 pisg V307.. partially V129.. P202 under vacuum PT204. <10-4 Torr PT201.. <10 mtorr PT301. 15 psig PT302. not In hydrogen manifold: V101.. V102.. V103.. V104.. V105.. V106.. V130.. V131.. V132.. P107.. 10 pisg P108. 10 psig Hydrogen bottles PR101.. PR102.. PR103.. PR104.. Helium bottle PR107.. V133.. V134.. V135.. V136.. In helium manifold: Helium bottle V401... PR401. V402.. V403.. V404.. V405.. V406.. P401.. 2-5 psid In argon supply: V501 PR501.. V502.. V503..

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/25/05 25 V504.. V505.. V506.. P501. Pumps: MP101. TP201.. MP201. 15 psig not TP301 MP301.. RGA.., on VC Target Operator Date

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/25/05 26 C. Warming up the Hydrogen filled Target to room temperature C. 1 Initial state of valves: In gas panel: V107.. V108.. PR105. V109.. V110.. V111.. V112.. V113.. V114.. V115.. V116.. V117.. V118.. V119.. V119A V120.. V122.. V123.. V124. V125.. V127.. V140.. V141.. P101.. 2-3 psid P102.. 10 psig P103 10 psig P103A. 10 pisg P104 10 psig P105 10 pisg PT101. 2-3 psid PT104. 10 psig PT105. 10 pisg PT103 10 psig PT105. 15 psig PT106.. 10 pisg In vacuum system: V201.. V204.. V205.. V206.. V207.. V302.. V307.. partially V129.. P202 under vacuum PT204. <10-4 Torr PT201.. <10 mtorr PT301. 15 psig PT302. not In hydrogen manifold: V101.. V102.. V103.. V104.. V105.. V106.. V130.. V131.. V132.. P107.. 10 pisg P108. 10 psig Hydrogen bottles PR101.. PR102.. PR103.. PR104.. Helium bottle PR107.. V133.. V134.. V135.. V136.. In helium manifold: Helium bottle V401... PR401. V402.. V403.. V404.. V405.. V406.. P401.. 2-5 psid In argon supply: V501 PR501..

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/25/05 27 V502.. V503.. V504.. V505.. V506.. P501. Pumps: MP101. TP201.. 15 psig not MP201. TP301 MP301.. RGA.., on VC Target Operator Date

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/25/05 28 C. 2 Warming up the Hydrogen filled Target to room temperature 1. At the beginning of Procedure C, the Target is full of liquid hydrogen.. 2. Confirm that all initial conditions for Procedure C are met. They are the same as the final conditions for Procedure B. 3. Open valve V130. This will start the venting through CKV101. 4. Stop the cryo coolers. 5. As the liquid hydrogen boils off, monitor the target vessel pressure on PT105. The boil-off of the 16 liters of liquid hydrogen should take aa hours. When all the liquid is boiled off, the pressure in the hydrogen vessel is about 15 psid (about 3 psi above the ambient pressure at Los Alamos). Temperatures, T2, T6, and T8 are above the hydrogen liquid-vapor curve value 20K??. 6. The hydrogen boil off rate can be accelerated by introducing argon gas into the main vacuum. Close V204 and V207. 7. Open V205 and then close V205 when pressure 5 psia??. 8. Once the target is warmed up higher than the liquid hydrogen temperature continue with Procedure D. Do not leave hydrogen gas in the target vessel. 9. Check that all final conditions are for Procedure B are met. Target Operator Date

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/25/05 29 C. 3 Final state of valves: In gas panel: V107.. V108.. PR105. V109.. V110.. V111.. V112.. V113.. V114.. V115.. V116.. V117.. V118.. V119.. V119A V120.. V122.. V123.. V124. V125.. V126. V127.. V140.. V141.. P101.. P102.. P103 P103A. P104 P105 PT101. PT104. PT105. PT103 PT105. PT106.. In vacuum system: V201.. V204.. V205.. V206.. V207.. 2-3 psid 10 psig 10 psig 10 pisg 10 psig 10 pisg 2-3 psid 10 psig 10 pisg 10 psig 15 psig not V302.. V307.. partially V129.. P202 15 psig PT204. not PT201.. <10 mtorr PT301. <10 mtorr PT302. <10-5 Torr In hydrogen manifold: V101.. V102.. V103.. V104.. V105.. V106.. V130.. V131.. V132.. P107.. 10 pisg P108. 10 psig Hydrogen bottles PR101.. PR102.. PR103.. PR104.. Helium bottle PR107.. V133.. V134.. V135.. V136.. In helium manifold: Helium bottle V401... PR401. V402.. V403.. V404.. V405.. V406.. P401.. 2-5 psid In argon supply: V501 PR501.. V502..

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/25/05 30 V503.. V504.. V505.. V506.. P501. Pumps: MP101. TP201.. 15 psig not MP201. TP301 MP301.. RGA.., on VC Target Operator Date

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/25/05 31 D. Purging Hydrogen out from the Target Vessel and Filling the lines with Helium D. 1 Initial state of valves: In gas panel: V107.. V108.. PR105. V109.. V110.. V111.. V112.. V113.. V114.. V115.. V116.. V117.. V118.. V119.. V119A V120.. V122.. V123.. V124. V125.. V126. V127.. V140.. V141.. P101.. 2-3 psid P102.. 10 psig P103 10 psig P103A. 10 pisg P104 10 psig P105 10 pisg PT101. 2-3 psid PT104. 10 psig PT105. 10 pisg PT103 10 psig PT105. 15 psig PT106.. not In vacuum system: V201.. V204.. V205.. V206.. V207.. V302.. V307.. partially V129.. P202 15 psig PT204. not PT201.. <10 mtorr PT301. <10 mtorr PT302. <10-5 Torr In hydrogen manifold: V101.. V102.. V103.. V104.. V105.. V106.. V130.. V131.. V132.. P107.. 10 pisg P108. 10 psig Hydrogen bottles PR101.. PR102.. PR103.. PR104.. Helium bottle PR107.. V133.. V134.. V135.. V136.. In helium manifold: Helium bottle V401... PR401. V402.. V403.. V404.. V405.. V406.. P401.. 2-5 psid

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/25/05 32 In argon supply: V501 PR501.. V502.. V503.. V504.. V505.. V506.. P501. Pumps: 15 psig MP101. TP201.. MP201. TP301 MP301.. RGA.. not, on VC Target Operator Date

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/25/05 33 D. 2 Purging Hydrogen out from the Target Vessel and Filling the lines with Helium 1. The Target is at room temperature and full of hydrogen gas. 2. Confirm that all initial conditions for Procedure D are met. They are the same as the final conditions for Procedure C. 3. Turn on MP101. 4. Open valves V141, V115, V122, and V124. D. 3 Pumping Hydrogen out from the Target Vessel 5. Start pumping the hydrogen vessel by ing V125 and V126. Keep pumping till TP106 on MP101 drops below 100 mtorr. This will pump hydrogen out of the target vessel, and will also pump from the relief chamber the hydrogen and helium mixture from the venting the target. 6. Close V141 and V130. 7. Open V140 to backfill the target vessel with helium. 8. Open V113 and V111 to refill the relief chamber with helium. 9. Close V140 when PT101, PT103, and PT104 reach 14 psia. 10. Close V111. 11. Open V141. 12. When PT106 on MP101 drops below 100 mtorr close V141. 13. Open V306. 14. When PT302 is less than 10-4 Torr, V129. 15. Monitor residual gases in the target vessel with RGA. When the partial pressures have flattened off, record the values. 16. Close V129 and V306 and V207. 17. Open V140 and backfill the target vessel with helium gas until PT104 reaches 11 psia then close V140 and V403 on the helium manifold.

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/25/05 34 18. The target and all the lines contain an inert gas helium. Turn off pumps TP301, Tp201, and MP101. Vent the pumps. 19. Close valves V126, V124, V122, V115, and V113. 20. Check that all final conditions for Procedure D are met. Target Operator Date

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/25/05 35 D. 4 Final state of valves: In gas panel: V107.. V108.. PR105. V109.. V110.. V111.. V112.. V113.. V114.. V115.. V116.. V117.. V118.. V119.. V119A V120.. V122.. V123.. V124. V125.. V126. V127.. V140.. V141.. P101.. P102.. P103 P103A. P104 P105 PT101. PT104. PT105. PT103 PT105. PT106.. In vacuum system: V201.. V204.. V205.. V206.. V207.. 2-3 psid 11 psig 11 psig 11 pisg 11 psig 11 pisg 2-3 psid 11 psig 11 pisg 11 psig 11 psig 11 psig V302.. V307.. partially V129.. P202 vacuum PT204. <10-4 Torr PT201.. <10 mtorr PT301. not PT302. not In hydrogen manifold: V101.. V102.. V103.. V104.. V105.. V106.. V130.. V131.. V132.. P107.. 10 pisg P108. 10 psig Hydrogen bottles PR101.. PR102.. PR103.. PR104.. Helium bottle PR107.. V133.. V134.. V135.. V136.. In helium manifold: Helium bottle V401... PR401. V402.. V403.. V404.. V405.. V406.. P401.. 2-5 psid In argon supply: V501 PR501.. V502..

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/25/05 36 V503.. V504.. V505.. V506.. P501. Pumps: MP101. TP201.. MP201. 2-5 psig not TP301 MP301.. RGA.. not not not Target Operator Date

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/25/05 37 E. Change of Empty Hydrogen Gas Cylinder E. 1 Initial state of valves: In gas panel: V107.. V108.. PR105. V109.. V110.. V111.. V112.. V113.. V114.. V115.. V116.. V117.. V118.. V119.. V119A V120.. V122.. V123.. V124. V125.. V126. V127.. V140.. V141.. P101.. P102.. P103 P103A. P104 P105 PT101. PT104. PT105. PT103 PT105. PT106.. In vacuum system: V201.. V204.. V205.. 2-3 psid 11 psig 11 psig 11 pisg 11 psig 11 pisg 2-3 psid 11 psig 11 pisg 11 psig 11 psig 11 psig V206.. V207.. V302.. V307.. partially V129.. P202 vacuum PT204. <10-4 Torr PT201.. <10 mtorr PT301. not PT302. not In hydrogen manifold: V101.. V102.. V103.. V104.. V105.. V106.. V130.. V131.. V132.. P107.. 10 pisg P108. 10 psig Hydrogen bottles PR101.. PR102.. PR103.. PR104.. Helium bottle PR107.. V133.. V134.. V135.. V136.. In helium manifold: Helium bottle V401... PR401. V402.. V403.. V404.. V405.. V406.. P401.. 2-5 psid

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/25/05 38 In argon supply: V501 PR501.. V502.. V503.. V504.. V505.. V506.. P501. Pumps: MP101. 2-5 psig not TP201.. MP201. TP301 MP301.. RGA.. not not not Target Operator Date

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/25/05 39 E. 2 Change of Empty Hydrogen Gas Cylinder The assumption is that all the three hydrogen bottles have been emptied and need to be replaced. 1. Confirm that all initial conditions for Procedure E are met. 2. Turn pump MP101 on. 3. Open valves V141, V115, V113, V110, V131, V132, V100, V102, V104, and V106. 4. Check that the bottle(s) being replaced is and that its regulator (PR101, PR102, and PR103) is fully. 5. Check that the helium bottle on the hydrogen manifold is and that its regulator PR107 and V134 and V135 are fully. 6. Wait until pressure on PT106 on MP101 drops below 100 mtorr and then V131 and V132. 7. Close the helium bottle regulator PR107 and then the helium bottle and set pressure to 0 psig. 8. Close the helium bottle when P108 indicates 0 pisg. 9. Fully close all the hydrogen bottle regulators (PR101, PR102, and PR103) and replace the depleted hydrogen cylinder(s). 10. Open valves V131 and V132 and all the hydrogen regulators PR101, PR102, and PR103. 11. Close valve V131 and V132 when PT106 on MP101 indicates pressure less than 100 mtorr. 12. Open the helium bottle regulator PR107 and set pressure to 3 psig. 13. Close the hydrogen bottle regulators PR101, PR102, and PR103. 14. Close V141. 15. Open valve V131 and V132 to bring 3 psig of helium gas to the lines connecting the hydrogen manifold and the gas panel.

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/25/05 40 16. When PT102 and PT103 reach 3 psig, close the helium regulator PR107 and the bottle. 17. Close valves V115, V113, V110, V131, V132, V100, V102, V104, V106, V134, and V135. 18. Turn pump MP101 off and vent it. 19. Check that hydrogen regulators PR101, PR102, and PR103 are. 20. Open the replaced hydrogen bottle(s) and do leak check on the bottleregulator joint with bubble tester. 21. Close the hydrogen bottles. 22. Check that all final conditions for Procedure E are met. They should be same as initial conditions for this Procedure. Target Operator Date

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/25/05 41 E. 3 Final state of valves: In gas panel: V107.. V108.. PR105. V109.. V110.. V111.. V112.. V113.. V114.. V115.. V116.. V117.. V118.. V119.. V119A V120.. V122.. V123.. V124. V125.. V126. V127.. V140.. V141.. P101.. P102.. P103 P103A. P104 P105 PT101. PT104. PT105. PT103 PT105. PT106.. In vacuum system: V201.. V204.. V205.. V206.. V207.. V302.. 2-3 psid 11 psig 11 psig 11 pisg 11 psig 11 pisg 2-3 psid 11 psig 11 pisg 11 psig 11 psig 11 psig V307.. partially V129.. P202 vacuum PT204. <10-4 Torr PT201.. <10 mtorr PT301. not PT302. not In hydrogen manifold: V101.. V102.. V103.. V104.. V105.. V106.. V130.. V131.. V132.. P107.. 10 pisg P108. 10 psig Hydrogen bottles PR101.. PR102.. PR103.. PR104.. Helium bottle PR107.. V133.. V134.. V135.. V136.. In helium manifold: Helium bottle V401... PR401. V402.. V403.. V404.. V405.. V406.. P401.. 2-5 psid In argon supply: V501 PR501.. V502.. V503.. V504..

Operating Procedures for the NPDGamma Liquid Hydrogen Target V0.03 11/25/05 42 V505.. V506.. P501. Pumps: MP101. TP201.. MP201. TP301 2-5 psig not not MP301.. RGA.. not not Target Operator Date