TRT Leak Repair Anatoli Romaniouk,

EC leak tests Side C Side A 2

Location of the pipes with leaks А6 PPF1 connector А4 Bracket А2 Detector side А1 PPF1 connector B3 Bracket EC Side C 3 B5 Bracket А3 Bracket A2 OUT F mm Ch. 2 Leak 0.3 l/h A3 OUT F mm Ch. 3 Leak 0.3 l/h A4 OUT F mm Ch. 4 Leak huge A6 OUT F mm Ch. 6 Leak huge A1 OUT F mm Ch. 1 Leak 17l/h B5 OUT F mm Ch. 11 Leak 0.3l/h B3 OUT F mm Ch. 9 Leak 2 l/h

EC Side C: Endoscope study Pipes were cut and were studied with endoscope from inside 4

A1 crack along the pipe (PPF1 connector) 5

A4 PPF1 bracket.

Detector connector 7

This pipe should be repaired To go inside we need to open some accesses Repair should be done also here (PPF1 area) 8

9 Example how pipes installed on the calorimeter flange

10 EC wheel type A connectivity Electronics Gas manifold Gas Straws/radiator Electronics Gas manifold Gas Straws/radiator Gas IN Gas OUTPEEK pipes shown in pink Places of stress

EC: on detector connection

12 PEEK pipe termination Most probable location of leaks

Repair at the detector level Nut PEEK pipe Most probable places of leaks Insert Steel pipe Polyurethane joint Connector Removable steel road

14 Example how pipes installed on the calorimeter flange

15 Repair status TRT WheelRepair and testsComments A1 A2Done, OKLeak fixed A3Done, OKLeak fixed A4Done, failedLarge, Repair is OK but leak in the other place A5Done, OKNo leak before A6Done, partially failedLeak reduced but still large. Repair is OK but there is still leak in the other place B1Done, OKNo leak before B2Done OKNo leak before B3Done, failedLeak still at the level of 2.5 l/h (can be controlled) B4Done OKLeak was small, now no remarkable leak B5Done, failedLeak still at the level of 0.25 l/h (can be controlled) B6 B7 B8

16 Next steps: Today - try to go outside of the tube ( A4 and A6) and see what can be done at the place of connection. End of the week - Close C side (if no additional repair can be made) and start working with side A. When side A will be available to start preparatory work?