Job Hazard Analysis Form
Job Title: ArgoNeuT Filter Replacement
Date of Analysis: June 19, 2008
Reviewed By (optional):
Approved By (Supervisor/Task Manager):
Job Location: Proton Assembly Building
Job Description:
The ArgoNeuT system will contain two TRIGON argon filters, which will periodically
need to be replaced when saturated. The filters are positioned in parallel, with only one in
use at a time, allowing for replacement to occur without affecting operation of the system.
Personal Protective Equipment:
• Face shield
• Cryogenic Apron
• Cryogenic Gloves
• Protective Shoes
Equipment Required for Job:
Work Plan History Information: (List any lessons learned from this job, tips from
previous jobs.)
1
The operators performing the filter swap should be aware of the hazards listed in the
following table, and the necessary procedures to mitigate these hazards.
Hazard Analysis
STEP HAZARD PRECAUTIONS/SAFETY/PROCEDURE
Attach/Disconnect Piping Burns Wear Cryo gloves/apron/mask
Contamination Check valves before/after procedure.
Pump out lines according to procedure.
ODH The ArgoNeuT system is hooked into a vent line
that runs outside of PAB.
The system is also equipped with 2 ODH monitors.
Overpressure Monitor pressure gauges during procedure.
Remove Filter Falling Use lift. Operator must have training.
Drop Filter Wear protective shoes.
Clear area below work site.
2
My supervisor has reviewed this hazard analysis with me and I understand
the hazards and required precautionary actions. I will follow the
requirements of this hazard analysis or notify my supervisor if I am unable to
do so. I understad that there are Environmental, Safety and Health
Professionals on staff if I need further assistance or clarification.
Name and ID Signature Date
(please print)
3
Filter Replacement Procedure
The system will be arranged as depicted in Figure 1. The following steps should be taken
to change either filter #1 or #2:
Figure 1: ArgoNeuT Recirculation System
Cu Filter #1 Changing Procedure
1. Shutoff cryocooler and heaters HTR-15-Ar and HTR-52-Ar.
2. Open MV-43-Ar and MV-44-Ar.
3. Make sure MV-33-Ar is open. Close MV-34-Ar. Wait 1 minute for liquid to drain
from filter.
4. Loosen clamps on insulation. Remove insulation around top and bottom isolation
valves of filter. Close nitrogen purge MV-81-N.
4
5. Close MV-33-Ar.
6. Disconnect exhaust of trapped volume relief on filter. Depending on which filter is
installed, the valve tag could be SV-32-Ar or SV-42-Ar or SV-92-Ar. Leave the
exhaust of the relief valve open. But cap the ? vent line it was connected to.
Disconnect cable to thermalcouple on filter.
7. Close the top isolation valve on the filter. Depending on which filter is installed, the
valve tag could be MV-31-Ar or MV-41-Ar or MV-91-Ar.
8. Close the bottom isolation valve on the filter. Depending on which filter is installed,
the valve tag could be MV-30-Ar or MV-40-Ar or MV-90-Ar.
9. Open MV-37-Ar an MV-38-Ar to release pressure.
10. Carefully disconnect VCR fittings on top and bottom of filter.
11. Remove filter.
12. Install replacement filter and connect VCR fittings on top and bottom of the filter.
13. Connect exhaust of trapped volume relief on filter. Depending on which filter is
installed, the valve tag could be SV-32-Ar or SV-42-Ar or SV-92-Ar Connect cable
to thermalcouple on filter.
14. Purify the filter inlet and outlet connections by vacuum pumping and back filling
with clean argon gas through valves MV-37-Ar and MV-38-Ar.
15. Open the top isolation valve on the filter. Depending on which filter is being
installed, the valve tag could be MV-31-Ar or MV-41-Ar or MV-91-Ar.
16. Open the bottom isolation valve on the filter. Depending on which filter is being
installed, the valve tag could be MV-30-Ar or MV-40-Ar or MV-90-Ar.
17. Replace insulation around top and bottom isolation valves of filter. Install clamps
on insulation. Open nitrogen purge valve MV-81-N.
18. Turn on the cryocooler and put PID loop for heaters HTR-15-Ar in Automatic. and
HTR-52-Ar
Cu Filter #2 Changing Procedure
1. Shutoff cryocooler and heaters HTR-15-Ar and HTR-52-Ar.
2. Open MV-33-Ar and MV-34-Ar.
5
3. Make sure MV-43-Ar is open. Close MV-44-Ar. Wait 1 minute for liquid to drain
from filter.
4. Loosen clamps on insulation. Remove insulation around top and bottom isolation
valves of filter. Close nitrogen purge MV-82-N.
5. Close MV-43-Ar.
6. Disconnect exhaust of trapped volume relief on filter. Depending on which filter is
installed, the valve tag could be SV-32-Ar or SV-42-Ar or SV-92-Ar. Leave the
exhaust of the relief valve open. But cap the ? vent line it was connected to.
Disconnect cable to thermalcouple on filter.
7. Close the top isolation valve on the filter. Depending on which filter is installed, the
valve tag could be MV-31-Ar or MV-41-Ar or MV-91-Ar.
8. Close the bottom isolation valve on the filter. Depending on which filter is installed,
the valve tag could be MV-30-Ar or MV-40-Ar or MV-90-Ar.
9. Open MV-47-Ar an MV-48-Ar to release pressure.
10. Carefully disconnect VCR fittings on top and bottom of filter.
11. Remove filter.
12. Install replacement filter and connect VCR fittings on top and bottom of the filter.
13. Connect exhaust of trapped volume relief on filter. Depending on which filter is
installed, the valve tag could be SV-32-Ar or SV-42-Ar or SV-92-Ar Connect cable
to thermalcouple on filter.
14. Purify the filter inlet and outlet connections by vacuum pumping and back filling
with clean argon gas through valves MV-47-Ar and MV-48-Ar.
15. Open the top isolation valve on the filter. Depending on which filter is being
installed, the valve tag could be MV-31-Ar or MV-41-Ar or MV-91-Ar.
16. Open the bottom isolation valve on the filter. Depending on which filter is being
installed, the valve tag could be MV-30-Ar or MV-40-Ar or MV-90-Ar.
17. Replace insulation around top and bottom isolation valves of filter. Install clamps
on insulation. Open nitrogen purge valve MV-82-N.
18. Turn on the cryocooler and put PID loop for heaters HTR-15-Ar in Automatic. and
HTR-52-Ar
