ibl cooling thermal chock incident 15 october 2014 1 the ibl cooling team
TRANSCRIPT
IBL blow off incident
• The thermal shock incident during the blow-off test has learnt us several wise lessons.
• As we designed our system to be thermal shock proof during operation, we have underestimated this behavior at stand-still.– Especially during special events, like emptying and filling.– New vacuum transfer lines have too good insulation and can house liquid for
longer time than we were used too.• Earlier (small) signs are now understood due to blow off incident.• Working on solutions to be safe at standstill or during maintenance
procedures.• Take lessons into account for future detector cooling systems
– Eg. IBL is lowest point, perhaps better would have been that the tubing comes from below or has siphons at in and outlets.
– The latter requires more realistic distribution piping mock-ups during development phase.
2
Thermal shock incident and following warm-up
3
900 950 1000 1050-40
-35
-30
-25
-20
-15
-10
-5
0
5
10
Thermal shock incident
Drops of liquid was able to enter the detector at some occasions, causing min-shocks
Warm-up of detector
Saturation temperature rise due pressurization (warming up)
Blow-off with liquid from bottle
System emptying caused a too large difference between detector temperature and 2-phase temperature.=> Better focus on standstill behavior
Similar behavior at a warm-up after stop
• During warm-up after a stop we have seen similar behavior but due to the small difference between detector temperature and 2-phase temperature, the changes were in the order of degrees.
• Until the incident we did not fully understand the cause as the manifold is designed to by the highest point such that no liquid can enter by gravity.
• Blow-off incident learned us that an external push is in the system causing this.– Plant safety by-pass seams responsible for the continuous push
4
Normal situation after a stop: System is emptied due to
evaporation by ambient heat
5
Ambient heatAmbient heat
Gas to accumulator
CO2 stored in accu
Plant
IBL
ManifoldJunction box
Ambient heat
Gas to system
Vacuum insulated transfer line
Liquid slug
Liquid slug
Current issue in IBL
• Vacuum insulated lines keep liquid for longer time.• Plant over pressure valve pushes liquid sluts towards the detector.• Sometimes liquid gets as high as the manifold and is pushed into the detector• Gravity brings it down to the detector it self
6
Liquid entering warmer detector
Liquid slugs are pushed to detector
CO2 stored in accu
Plant
IBL
ManifoldJunction box
Ambient heat
Vacuum insulated transfer line
Liquid slugLiquid slug
Plant is pressurized by ambient heat and over pressure escapes through vent valve, causing a push through detector
Ambient heat
Liquid slugs are pushed to detector
Solution to prevent in the future:Installation of a safety by-pass
• A safety by-pass will be installed– Normally open (safety position is open)– Closed only when circulation through the system by the pump is achieved
7
Ambient heatAmbient heat
Gas to accumulator
CO2 stored in accu
Plant
IBL
ManifoldJunction box
Ambient heat
Gas to system
Vacuum insulated transfer line
Liquid slug
Liquid slug
Plant
Ambient heat
A safety by-pass prevents a pressure build up in the liquid line.
AC042
LP101
ventevacuate
6
8
FT106
⅜”
EH106TT106TS106
EH101 / EH102 / EH103TT101 / TT102 / TT103TS101 / TS102 / TS103PT101 / PT102 / PT103
HX150
CO2 system A100 labels
LT142LT342
FT306
FL304
⅜”
FL306
VP05
6
50
40
12
4444
46
48
PV110
PT150/ TT150/ SC150
¼”
BD108PT108TT108
CO2 from experiment
CO2 to experiment
42
PT142
PV108
PV144
HX148
TT148BD148
SV042 SV043MV042
FL144
MV041
TT146
AV108
Freon chiller A
200
CO2 system B300 labels
10
LP101EH301 / EH302 / EH303TT301 / TT302 / TT303TS301 / TS302 / TS303PT301 / PT302 / PT303
4
FL344
PT304TT304
MV306
6
8
EH306TT306TS306
BD308PT308TT308
AV308
PV308
PV310
PV344
46 TT346
HX350
HX348
LP301
Fill port
nc
nc
no
nc
no
nc
MV050
MV054MV052 MV056BD054
PT054
EV148 EV348
nc nc
50
PT350/ TT350/ SC350
SV040 MV040
SV041 BD01210
MV058
NV110
MV110 MV310nc
CV142
nc
CV342
ncnc
ncnc
nc
nc
Cold CO2 lineCold R404a lineWarm service line(Cold lines require 32mm insulation)
no
NV310
no
¼” ¼”
½”½”
½”
½” ½”
48 TT348BD348
Freon chiller B
400
MV043
PT342
BV, 28-01-2014
PT040
PT042
PT056
PRC142 controlling CV142, EH142/143(PT142 & SC150)
PRC342 controlling CV342, EH342/143(PT342 & SC350)
PT050 PT058
no
FL104
4 PT104TT104
nc
FL106
Fill port
MV106
EH142/143TT142/143TS142/143
FL042
EH342/343TT342/343TS342/343
MV012
MV039
AV012
nc
AC042
LP101
ventevacuate
6
8
FT106
⅜”
EH106TT106TS106
EH101 / EH102 / EH103TT101 / TT102 / TT103TS101 / TS102 / TS103PT101 / PT102 / PT103
HX150
CO2 system A100 labels
LT142LT342
FT306
FL304
⅜”
FL306
VP05
6
50
40
12
4444
46
48
PV110
PT150/ TT150/ SC150
¼”
BD108PT108TT108
CO2 from experiment
CO2 to experiment
42
PT142
PV108
PV144
HX148
TT148BD148
SV042 SV043MV042
FL144
MV041
TT146
AV108
Freon chiller A
200
CO2 system B300 labels
10
LP101EH301 / EH302 / EH303TT301 / TT302 / TT303TS301 / TS302 / TS303PT301 / PT302 / PT303
4
FL344
PT304TT304
MV306
6
8
EH306TT306TS306
BD308PT308TT308
AV308
PV308
PV310
PV344
46 TT346
HX350
HX348
LP301
Fill port
nc
nc
no
nc
no
nc
MV050
MV054MV052 MV056BD054
PT054
EV148 EV348
nc nc
50
PT350/ TT350/ SC350
SV040 MV040
SV041 BD01210
MV058
NV110
MV110 MV310nc
CV142
nc
CV342
ncnc
ncnc
nc
nc
Cold CO2 lineCold R404a lineWarm service line(Cold lines require 32mm insulation)
no
NV310
no
¼” ¼”
½”½”
½”
½” ½”
48 TT348BD348
Freon chiller B
400
MV043
PT342
BV, 28-01-2014
PT040
PT042
PT056
PRC142 controlling CV142, EH142/143(PT142 & SC150)
PRC342 controlling CV342, EH342/143(PT342 & SC350)
PT050 PT058
no
FL104
4 PT104TT104
nc
FL106
Fill port
MV106
EH142/143TT142/143TS142/143
FL042
EH342/343TT342/343TS342/343
MV012
MV039
AV012
nc
PV112
PV312
Safety by-pass• 2 Normally closed pneumatic valves will be installed
(IBL A and B).• Valves will be connector to current blow system
connection• Installation after the bake-out as safety by-pass is also
by passing the blow flow when triggered.• By-pass valves are warm and similar type as the
service manifold
Safety by-pass stop test
• Plant B-valves were used to simulate a safety by-pass.
• No observation of entering liquid after stop
• By-pass will be installed after bake-out
9
Cooling pipe temperatures
Stave 01 temperatures
Manifold temperatures
This looks like the same effect but is due to condensation inside the IBL staves as they are colder due to pixel cooling
AC042
LP101
ventevacuate
6
8
FT106
⅜”
EH106TT106TS106
EH101 / EH102 / EH103TT101 / TT102 / TT103TS101 / TS102 / TS103PT101 / PT102 / PT103
HX150
CO2 system A100 labels
LT142LT342
FT306
FL304
⅜”
FL306
VP05
6
50
40
12
4444
46
48
PV110
PT150/ TT150/ SC150
¼”
BD108PT108TT108
CO2 from experiment
CO2 to experiment
42
PT142
PV108
PV144
HX148
TT148BD148
SV042 SV043MV042
FL144
MV041
TT146
AV108
Freon chiller A
200
CO2 system B300 labels
10
LP101EH301 / EH302 / EH303TT301 / TT302 / TT303TS301 / TS302 / TS303PT301 / PT302 / PT303
4
FL344
PT304TT304
MV306
6
8
EH306TT306TS306
BD308PT308TT308
AV308
PV308
PV310
PV344
46 TT346
HX350
HX348
LP301
Fill port
nc
nc
no
nc
no
nc
MV050
MV054MV052 MV056BD054
PT054
EV148 EV348
nc nc
50
PT350/ TT350/ SC350
SV040 MV040
SV041 BD01210
MV058
NV110
MV110 MV310nc
CV142
nc
CV342
ncnc
ncnc
nc
nc
Cold CO2 lineCold R404a lineWarm service line(Cold lines require 32mm insulation)
no
NV310
no
¼” ¼”
½”½”
½”
½” ½”
48 TT348BD348
Freon chiller B
400
MV043
PT342
BV, 28-01-2014
PT040
PT042
PT056
PRC142 controlling CV142, EH142/143(PT142 & SC150)
PRC342 controlling CV342, EH342/143(PT342 & SC350)
PT050 PT058
no
FL104
4 PT104TT104
nc
FL106
Fill port
MV106
EH142/143TT142/143TS142/143
FL042
EH342/343TT342/343TS342/343
MV012
MV039
AV012