IBL cooling thermal chock incident 15 October 2014 1 The IBL cooling team.

IBL cooling thermal chock incident

15 October 2014

1

The IBL cooling team

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


Ambient heat


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


Ambient heat

Gas to system


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)


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


HX150


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


10


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


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



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


HX150


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


10


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


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



PT050 PT058

no

FL104

4 PT104TT104

nc

FL106

Fill port

MV106

EH142/143TT142/143TS142/143

FL042

EH342/343TT342/343TS342/343

MV012

MV039

AV012

IBL cooling thermal chock incident 15 October 2014 1 The IBL cooling team.

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Transcript of IBL cooling thermal chock incident 15 October 2014 1 The IBL cooling team.