The closed loop system at ISR
We moved the system at ISR in January.
Preliminary tests has been done in order to verify the possible use in the “ISR conditions”:
1. Total flow of 150-200 l/h
2. Connect and disconect frequently the RPC from the gas system
The closed loop worked at the GIF for many months with a total flow of 40 l/h and a fresh mixture input of 2 l/h (5% of the total flow)
CMS week 14 March 2005 Roberto Guida
Total flow of 150-200 l/h
• The system was tested succesfully with an argon bootle (short test: only few hours)
• During this test 4 RPC were connected
• A total flow of 200 l/h was reaced with an
input flow of 10 l/h (5% of the total flow)
Connect and disconect frequently the RPC from the gas system
• The RPCs under test change every 2-3 weeks
• It must be avoided the connection of an RPC full of air to the closed loop system (contamination of all the circuit)
• It is impossible to stop the gas flow (the
system is sensible to pressure variation)
Project
• We have forseen an open loop line for the first connection of an RPC and two three ways valves (for each gas line) for the
commutation between the open loop to the closed loop
• We have already tested this solution with two channel connected to the closed loop and two valves per channel for the
commutation
Input Open Loop
Output Open Loop
Closed Loop Rack Output
Closed Loop
Input Closed
Loop
Distrib. Rack Input Part Distrib. Rack
Output Part
RPC
bubblers
Three ways valve Rotameters
Ch 1 Ch 2
Cl,
Op, Cl, Op, Op, Cl, Op, Cl,
Flux contr. Flux contr.
Legend
Status of the system
• Test of the three ways valve OK
• Test of the connection to the general input and output lines OK
• 3 new lines for the closed loop (input and output) OK 1 new line for the open loop (input and output) OK Each line is about 100 mt long
• Construction of the commutation pannels (between closed and open loop) OK
• Construction of the commutation pannels (between closed and open loop) OK
Input valves
output valves Bubblers for the open line
10 channels
