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**PHENIX MuId GAS OPS. IN THE PEH     **

**procedure name**

**[PHENIX Procedure No. PP-2.5.2.13-10]{.underline}**

**[Revision: B]{.underline} [Date: 18-05-01]{.underline}**

**[Hand Processed Changes]{.underline}**

**[HPC No.]{.underline} [Date]{.underline} [Page Nos.]{.underline}
[Initials]{.underline}**

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**[Approvals]{.underline}**

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PHENIX S E & I Date Cognizant Scientist/Engineer Date

/Activity Manager

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PHENIX Safety Date CA-D ES&H/ SAFETY Date

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# **1. Purpose and Scope**

> The scope of this procedure is those operations that are necessary for
> running the PHENIX Muon Identification Chambers (MuID) with mixture of
> CO2 and i-C4H10 as the chamber operation gas and N2 for the secondary
> volume purge gas.
>
> Operations in this procedure include the following:

1.  Initiating the mixture of CO2 and iso-C4H10 flow into the MuID
    chamber

2.  Stopping the mixture of CO2 and iso-C4H10 flow into the MuID
    chamber.

3.  Initiating the N2 flow.

4.  Stopping the N2 flow.

# **2. Responsibilities**

1.  The operator is responsible for conducting these procedures, logging
    activities, and responding to values out of range.

2.  Operators listed in Attachment 2 are known to be qualified to
    operate the MuID gas system.

# **3. Prerequisites**

1.  The operator shall have completed BNL Compressed gas safety course
    (OSH026).

2.  The operator shall have knowledge of the MuID gas system indicated
    by being listed as an operator in Attachment 2 of this procedure.

# **4. Precautions**

Over pressurization of the MUID (above 100 millibar) will result in
severe structural damage. Primary care should be given to monitoring the
internal pressure of the MUID throughout the duration of this procedure.

Before chamber outlet is pressurized well ( \>0.7"W.C.), compressor
operation may damaged gas system by sucking unnecessary gas from low
capacity vent line. Primary care should be given to monitoring the
outlet pressure of the MUID when turning on compressors.

We are allowed to flow CO2/iC4H10 mixture only under flammable limit,
9.3%. Primary care should be given to monitoring the gas mixture the
duration of this procedure.

# **5.** **Procedure**

Remarks

> All Solenoid valves (SV) are controlled by the MuID gas system
> software or the supply valve control rack.
>
> All manual valves (MV) and flow indicators are on MuID gas rack or on
> gas room wall.
>
> MuID gas system software indicates the solenoid valve status within
> reasonably short time period, but other status may take more than 2
> minutes to update.

## 5.1 [Initiating mixture of CO2 and iso-C4H10 flow into the MuID chamber.]{.underline}

1.  Go to the MuID chamber at the PHENIX IR.

2.  Open fully all 30 needle valves which are located at west middle
    platform, east middle platform, and east side of the square hole.

3.  Check that N2 is flowing into the MuID secondary volume. If not,
    please follow the 5.3.

4.  Go to the gas pad.

5.  Verify that the CO2 supply pressure is \~50 PSIG.

6.  Verify that the i-C4H10 supply pressure is \~25 PSIG.

7.  Go to PC room of the gas-mixing house.

8.  Turn on the MuID Gas PC.

9.  Log on the PC with "gas" account and then start MuID gas system
    software.

10. Close all exiting SV on the gas rack except SV4 that control N2
    flow.

11. Open all SVs on south and north MuID part.

12. Go to the MuID gas rack.

13. Close MV4, MV1b, MV1c, MV3a, MV3, MV2, MV5, FI7, FI2, MV1, FI4, FI3
    and FI1 by rotating clockwise, do not over tighten.

14. Remove a metal mesh on the right side of the MuID gas rack.

15. Close MV7.

16. Turn MV8 and MV9 to select to using SC1.

17. Reinstall a metal mesh on the right side of the MuID gas rack.

18. Go to CO2 supply valve on north wall.

19. Open dedicated MuID CO2 manual valve, MV/C18B by rotating slowly
    counter clockwise.

20. Check PI1 indicates \> 20 PSI pressure.

21. Open dedicated MuID I-C4H10 manual valves on the west wall, by
    rotating slowly counter clock wise.

22. Go to the valve control rack in the PC room.

23. Turn on the ISOBUTANE supply valve.

24. Go to the MuID gas rack.

25. Check PI2 indicating 15 PSIG pressure.

26. Go to the MuID PC rack.

27. Close CO2 and I-C4H10 toggling T1 and T2 to "close" position on the
    mass flow controller.

28. Set Knob-4 to "2".

29. Set Knob-3 to "set".

30. Turn Knob-2 to adjust CO2 flow rate 29.7 lpm on the display.

31. Set Knob-4 to "1".

32. Turn Knob-1 to adjust I-C4H10 flow rate 1.2 lpm on the display.

33. Set T1 and T2 to "auto" position. DO NOT set them "open" position.

34. Turn Knob-3 to "flow".

35. Open SV0, SV2 and SV3.

36. Go to the MuID gas rack.

37. Check PI5 indicating 50" W.C. pressure.

38. Adjust PI6 pressure 6" W.C. by using PCV0 and BPCV1.

39. Go to the MuID PC rack.

40. Open SV14.

41. Go to the MuID gas rack.

42. Open FI12, 6 turn counter clock wise from full closing position.

43. Check FI12 indicating 50 SCFH flow.

44. Check PI11 indicating \< 6" W.C and not fracutuating.

45. Go to MuID PC rack.

46. Check CO2 flow rate 29.7 lpm by setting Knob-4 to "2".

47. Check I-C4H10 flow rate 1.2 lpm by setting Knob-4 to "1"

48. Open SV5.

49. Check SV6 is closed. If open, close SV6.

50. Go to the MuID gas rack.

51. Open FI3, FI5, and FI6 until indicating 1 lpm, 500 cc/min, and 500
    cc/min respectively.

52. Check H2O and O2 contamination is less than 100 ppm on the MuID PC
    rack.

53. Check PT6 on PC screen indicating more than 0.7" W.C. This may take
    more than a few hours. DO NOT proceed to next step until PT6
    indicating \> 0.7"W.C.

54. Go to the MuID gas rack.

55. Close FI10.

56. Open MV6 to vent.

57. Close MV5.

58. Go to the MuID PC rack.

59. Open SV12.

60. Turn on SC1.

61. Go to the MuID gas rack.

62. Open FI10 slowly to adjust flow rate is 5 lpm. During this step,
    check PI9 indicating positive pressure. If it is zero or negative
    pressure, close FI10 immediately.

63. Close MV6.

64. Check PI9 indicate \> 20" W.C. pressure.

65. Go to the MuID PC rack.

66. Close SV5 and open SV6.

67. Close MV6.

68. Check FI10 indicating 5lpm.

69. Adjust PCV2 to maintain FI5 and FI6 has 500-cc/min flows.

70. Go to the MuID PC rack.

71. Wait until H20 and O2 contamination level is less than 350ppm and
    150ppm respectively. If H2O level is more than 1000 ppm, close SV6,
    open SV5 at MuID PC rack, and open MV6 at the MuID gas rack to vent.
    It may take more than few hours to reach these contamination levels
    as specified.

72. Close SV5.

73. Open SV6.

74. Go to the MuID gas rack.

75. Close MV6.

76. Remove a metal mesh on the right side of the MuID gas rack.

77. Open MV7.

78. Reinstall a metal mesh on the right side of the MuID gas rack.

79. Adjust flow rate on FI10 to 7 lpm by turning MV5 and FI10.

80. Check H20 and O2 contamination level less than 350 ppm and 150 ppm.
    It may take several miniatures. If not close MV7 and repeat from
    step 68.

## 5.2 [Stopping mixture of CO2 and iso-C4H10 flow into the MuID chamber.]{.underline}

1.  Go to MuID PC at the mixing house PC room

2.  Check MuID gas system software is running. If not, start MuID gas
    system software.

3.  Stop SC1 and SC2 when they run.

4.  Close SV 12 when it opens.

5.  Close SV6 and SV5.

6.  Close SV3.

7.  Confirm MV4 is closed.

8.  Toggle T1 to "close".

9.  Turn Knob-4 to "1" and turn Knob-3 to "flow".

10. Confirm zero flow on the mass flow controller display.

11. Toggle T2 to "close".

12. Turn Knob-4 to "2".

13. Confirm zero flow on the mass flow controller display.

14. Close SV2.

15. Close SV1, if it opens.

16. Go to the MuID gas rack.

17. Check PI5, PI6, and PI11 indicate zero pressure. It may take more
    than few minutes.

18. Go to the MuID PC rack.

19. Close SV14.

20. Go to the MuID gas rack.

21. Close FI12.

22. Close MV6 when it opens.

23. Close dedicated MUID CO2 manual valve, MV/C18B by rotating slowly
    clockwise.

24. Close dedicated MuID I-C4H10 manual valves on the west wall by
    rotating slowly clockwise.

25. Go to PHENIX gas control rack at the PC room.

26. Close I-C4H10 valve.

## 5.3 [Initiating N2 flow.]{.underline}

1.  Go to the gas pad.

2.  Verify that the N2 pressure supply is \~ 20 PSIG.

3.  Go to the MuID gas rack.

4.  Close valves on MuID gas rack, FI13, FI14.

5.  Go to MuID PC rack.

6.  Close SV4.

7.  Minimize the output pressure at PCV1.

8.  Check PI4 indicates near zero pressure.

9.  Go to the north wall of gas mixing house.

10. Open dedicated MuID N2 manual valves.

11. Go to the MuID gas rack.

12. Check PI3 indicating more than 15 PSI.

13. Go to the MuID PC rack.

14. Open SV4.

15. Open PCV1 gradually, until PI4 indicating \> 70" W.C.

16. Open FI14 until flow rate is 40 lpm.

17. Open FI13 until flow rate is 10 lpm.

## 5.4 [Stopping N2 flow.]{.underline}

1.  Go to mixing house N2 inlet on north wall.

2.  Close dedicated MuID N2 manual valve, by rotating slowly clockwise.

3.  Go to MuID gas rack.

4.  Close SV4 by MuID gas PC.

5.  Close FI14 by rotating clockwise gently - DO NOT OVER-TIGHTEN.

6.  Check FI14 indicates zero flow.

7.  Close FI13 by rotating clockwise gently - DO NOT OVER-TIGHTEN.

8.  Check FI13 indicates zero flow.

# **6 Documentation**

All notes and observations should be recorded in the MUID gas system
logbook. A gas system log sheet (attachment 3) should be completed every
8 hours and placed in the log sheet binder while gas is flowing.

# **7 References**

1.  MUID mixing room gas system schematic - PHENIX Drawing \#
    002-0213-701

2.  MUID IR gas system schematic - PHENIX Drawing #002-0213-702

# **8** **Attachments**

1.  MUID Gas System Acronym Glossary

2.  Responsible People/Operators

3.  Gas system log sheet

Attachment 1

> MUID GAS SYSTEM ACRONYM GLOSSARY
>
> AB Assembly building
>
> BPCV Back pressure control valve
>
> CV Check valve
>
> F Filter
>
> FI Flow indicator
>
> FM Mass flow controller
>
> MV Manual valve
>
> PCV Pressure control valve
>
> PI Pressure indicator
>
> PS Pressure switch
>
> PSV Pressure safety valve
>
> PT Pressure transmitter
>
> SV Solenoid valve
>
> TT Temperature transmitter
>
> WAH Wide angle hall

Attachment 2: [Responsible People/Operators]{.underline}

> The following people have been trained to operate the PHENIX MUID gas
> system within the scope described in section 1.0 above. They have
> completed the prerequisite BNL training courses (see 3.1).
>
> Leonid Kotchenda
>
> Atsushi Taketani
>
> Carter Biggs
>
> Additional qualified users are to be listed below and posted in the
> MUID gas system mixing room:

  ------------------------- ---------------------------- --------------------
  [Name]{.underline}        [Approved by]{.underline}    [Date]{.underline}

                                                         

                                                         

                                                         

                                                         

                                                         

                                                         
  ------------------------- ---------------------------- --------------------

Attachment 3. PHENIX MUID GAS SYSTEM CHECK LIST

> (To be filled out once per shift and placed in Gas System Binder)

  ---------- -------- ----------------- ------- ----------- --------------------
  Location   Sensor   Function          Value   Range       Comments

  MuID gas   PI1      CO2 supply        　      20-30 PSI   　
  rack                pressure                              

  MuID gas   PI2      I-C4H10 supply    　      10 20 PSI   　
  rack                pressure                              

  MuID PC    FM1      CO2 flow rate     　      10-15 lpm   　

  MuID PC    FM2      I-C4H10 flow rate 　      1-1.5lpm    　

  MuID gas   PI11     Supply pressure   　      4-6\" W.C.  　
  rack                                                      

  MuID gas   FI12     Total flow        　      30-70 SCFH  　
  rack                                                      

  MuID PC    PT4      Chmaber head      　      1-2.5\"     　
                      pressure                  W.C.        

  MuID PC    PT6      Outlet pressure   　      0.5-1.0\"   　
                                                W.C.        

  MuID gas   FI10     Return flow       　      5-8 lpm     　
  rack                                                      

  MuID gas   PI9      Return compressed 　      \>40\" W.C. 　
  rack                pressure                              

  MuID gas   FI6      H2O sensor flow   　      400-600     　
  rack                                          cc/min      

  MuID gas   FI5      O2 sensor flow    　      400-600     　
  rack                                          cc/min      

  MuID PC    H2O      H2O contamination 　      \< 150 ppm  　

  MuID PC    O2       O2 contamination  　      \< 400 ppm  　
  ---------- -------- ----------------- ------- ----------- --------------------

> If any of the above are outside their normal range, immediately
> contact a MuID gas expert.
>
> In addition, if PI6 or PI11 exceeds 7" W.C. then immediately shutdown
> the system by closing MV/C18B.

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