CAUSE AND EFFECTS OF FLUOROCARBON DEGRADATION IN ELECTRONICS AND
CMS Proposal for a Maintenance & Operation agreement with EN/CV/DC for fluorocarbon detector cooling...
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Transcript of CMS Proposal for a Maintenance & Operation agreement with EN/CV/DC for fluorocarbon detector cooling...
CMSCMSProposal for a Maintenance & Proposal for a Maintenance &
Operation agreement with Operation agreement with EN/CV/DC for fluorocarbon EN/CV/DC for fluorocarbon detector cooling circuitsdetector cooling circuits
v.2v.2
P. TropeaFor the CMS experiment
21 April 09 P. Tropea 2
Main requirements & outlineMain requirements & outline
This document collects the wishes of CMS for what concerns the operation and maintenance of the CMS fluorocarbon cooling systems at P5 and TIF. CMS would like to have:
• A dedicated work package between CMS & EN/CV/DC, independent from other experiments. The cost shall be discussed on the base of the service provided and the spares needed for CMS.
• Annual engagement, to be renewed tacitly or reviewed with at least 6 months notice
Structure of the document1. Limit of responsibility2. Operation & fine tuning3. Maintenance4. Stand-by duty5. Spare parts6. Fluid management
21 April 09 P. Tropea 3
Limits of responsibilityLimits of responsibilityEN/CV/DC is in charge of the operation and maintenance of all
the systems designed by them (chiller, brine circuit, Preshower, Thermal Screen and TIF cooling plants) and all of the systems (Silicon Strip 1 & 2 and Pixels) for which an official acceptance protocol shall be signed between CMS and EN/CV/DC (done for Pixels plant).
This protocol shall be commonly agreed before the signature of the maintenance and operation agreement.
The physical limit of responsibility is placed, as in the previous agreement, at the exit of the C6F14 cabinets in UXC55, where copper pipes are laid to the detector, including all the shut-off and manual regulation valves on manifolds.
Not covered by this document: commissioning phase and upgrades.
21 April 09 P. Tropea 4P. Tropea
Operation & fine tuningOperation & fine tuning
Two levels of access are required through the PLC touch panel (both password protected). Without password, the PLC touch panel can be used for monitoring purposes only.
1) “Expert CMS user”
2) “EN/CV/DC”: maintenance & operation
The “Expert CMS user” actions will be accessible also through DCS, switching of the physical key on the PLC rack (additional 6 keys to be implemented).
DCS will develop a “standard user” interface reducing the available actions and parameter ranges. All DCS actions will be traced.
21 April 09 P. Tropea 5P. Tropea
CMS “expert user” CMS “expert user”
“Expert CMS user” can, either through the PLC or DCS:
- read all parameters
- Read all set points and alarm thresholds (alarm thresholds: for the time being those values will be given on a spreadsheet, to be updated each time they are modified into the PLC program. By September 09 it will be possible to read them through DCS),
- change pressure and temperature set points within the agreed range (to be established at the end of commissioning with EN/CV/DC)
- Remotely operate cooling loops (on/off/lock)
- Remotely operate the manifold valves, on/off mode of single loops valves
- Operate the vacuum pump (this functionality has to be agreed for each cooling plant during commissioning)
21 April 09 P. Tropea 6
MaintenanceMaintenanceEN/CV/DC organizes predictive and corrective maintenance
following their standards and internal procedures (CAMMS, etc.). The maintenance plan major points shall be illustrated to CMS and agreed by both parties.
All predictive maintenance activities shall be scheduled in common agreement weeks in advance and confirmed in writing few days before the intervention (both from CMS and EN/CV/DC side). As a CMS general traceability policy, CMS requires a written report (logbook or e-mail) after each intervention.
A summary report shall be sent to CMS cooling coordinator every three months, including the full list of preventive and corrective maintenance interventions done and the possible extra cost associated (account details).
In case of major problems and corrective maintenance operation disrupting the operation of the detector, the solution proposed shall be presented and agreed along with its implications by CMS
21 April 09 P. Tropea 7
Normal operation support and stand-by dutyNormal operation support and stand-by duty
Interventions shall be guaranteed for corrective actions:- In 1 hour during working hours (8h30/17h30) and 24/7 during
beam time or critical detector operation (defined by CMS)- in 2 hours during other time The stand-by duty personnel shall be able to:- Put the system in a safe state (for the detector & the plant)- Make a basic diagnostic of the problem and restart the system
in case of minor failure - Contact an EN/CV/DC expert available on a “best effort basis”
for major problems- Write a report at the end of his intervention (logbook)A CMS representative shall accompany the “piquet” when
intervening in underground areas (2 men rule)In case of multiple requests received by the same piquet, CMS
infrastructure manager shall be consulted to define priorities between sub-detectors or to find an agreement in case of different experiments requiring the same service
21 April 09 P. Tropea 8
Spare partsSpare parts
The list of strategic spare parts shall be approved together with the M&O agreement. This has to contain the number of spares already in hand and the list of purchases suggested for the short and long term. Consumables shall be well defined and listed, in particular to precisely define what is NOT part of consumables.
Storage: a fenced area, locked, will be organized in P5 to store:- Any spare part not transportable by a sole person (pumps,
motors, compressors) which are not common to any other experiment
- Strategic parts and tools dedicated to the cooling systems - Clean fluids and tools for filling/draining
21 April 09 P. Tropea 9
Fluid managementFluid management
During the first 3 months of run of each cooling plant, an estimate of the leak rate per cooling plant will be done.
This value will be used to assess the annual need of coolant for the following year.
Any anomalous leak loss (detector disconnecting their cooling loops, maintenance activities, accidents, etc.) shall be justified and recorded on a common logbook.
EN/CV/DC is responsible for the monitoring of the fluid levels, leak rates and fluorocarbon quality as well as for the related leak searches and repairs in due time up to the distribution valves on the manifold.
Scheduling of leak search activities shall be mutually agreed whenever a derive of the leak rate is discovered.