Active gas system status. S.Konovalov, K.Zhukov. Active gas system operation. S.Konovalov "Active...

Active gas system status.

S.Konovalov, K.Zhukov

Active gas system operation.

S.Konovalov "Active gas system..." TRT Overview 15.02.2013 2

Good design and high-quality assembling of the gas system. Cooperation with the gas group. Prevention (monitoring of the parameters, analysis of trends). Spare parts.

1200 days of Gas system operation

Start Stop Months

12/09/2008 2/12/2008 3.3

25/09/2009 7/12/2010 14

8/02/2011 7/12/2011 10

29/02/2012 14/02/2013 12,5

≈40

Gas system was stopped.

Date days

27/08/2008 Gas analyzer (CO2 cell) 2

18/12/2009 Mixer rack (pressure gauge) 0.5

5-18/02/2010

Profibus problems 1-2

25/03-8/04/2010

Membrane rack (first stage pump) 13.5 (12+1.5)

29/11/2010 Gas analyzer (CO2 cell) 0.5

7/09/2011 Membrane rack (first stage pump) <1

18Efficiency ≈ 98.5 %Efficiency ≈ 98.5 %


Plans

Gas system upgrade. Some improvements for more safety, more reliability…

Tests & regulations. Automatic operation of the gas system in auxiliary operational modes (Filling, Recuperation, CF4 mixture, Ar mixture).

Maintenance & reparations. First priority tasks for to address

TRT leaks.

TRT meeting Friday, 15 February 2013 “Gas system status” https://indico.cern.ch/conferenceDisplay.py?confId=236045

List of priorities on the last slide


First priority tasks for to address TRT leaks

It is possible to stabilize leak in the most part of the leaking channels. For this it is needed to tune and keep with the big accuracy 2 parameters: gas flow in this channel and pressure in the TRT outlet (pump inlet pressure).

leakleak OUTIN

Pressure

OUT pressure is fixed.Input pressure is possible to change by changing of the gas flow.

Leak in 1 place



Gas flow regulation.Gas flow regulation in the existent gas manifolds is very rough. Design end production of the fine flow regulation valves is needed. Design of the new flow regulation valves is practically done. It is not needed to produce new distribution manifolds.

old

new



Remote gas flow regulation.When leak opens it is developing during some time (sometimes a few hours, sometimes several days). Every time we need to adjust gas flow in the leaking channel we need to ask urgent access and spend 1-2 hours in the cavern. Design, some tests (including tests in the magnetic field) end production of the remote gas flow regulation is needed. This work is began (Sergei Katunin).



Pump inlet pressure regulation.

Requirement for the pressure regulation accuracy was ± 1 mbar.

Real pressure regulation accuracy is even better ≈ 0.1 mbar .

It is desirable to decrease fluctuations of the TRT out pressure even more in order to stabilize leak.

0.14 mbar

Output pressure is oscillating.Input pressure is not constant.

leak OUTIN

Pressure



Next steps:precise pressure sensorPID algorithm fine tuningpump input resistance regulation

Replacement of the regulation valve.

Before . Now .

Regulation looks better. Pump input pressure fluctuations are at the same level ≈ 0.1 mbar .

Valve opening position

Valve opening set point



Pump pressure was regulating relative to the pressure in USA15. Pressure in the cavern differs from the pressure in USA15. This difference is not constant. Sometimes ΔP≈0.2 mbar and even more.

We have got differential pressure sensor. This gauge measures pressure difference between pump input and ID volume.

It helps to stabilize TRT output pressure. More tests is needed with more precise pressure sensor in barrel distribution rack output.

USA15 – UX15 PRESSURE DIFFERENCE FOR CIRCULATION PUMP OPERATION FEEDBACK

UX15-YSA15 pressure difference

0.1 mbar



Distribution Input pressure is not constant. It is proportional to the tank pressure. Problems with TRT leak forced us to change gas regulation algorithm.

The original idea was to keep concentrations of the gas components with the best accuracy. Variation of the tank pressure could be quite big.

New regulation algorithm is not perfect.

Fine tuning is needed. It will require quite a long time.

Gas regulation PID Xe CO2 O2 Kp Ti Kp Ti Kp Ti Minimum of the CO2 & O2 concentration fluctuations.

0.05 40 0.1 10 0.1 20 Before 20/08/2012

compromised. Better pressure regulation, concentration stabilities is still good

0.05 10 0.1 10 0.1 20

From 21/08/2012 to 21/11/2012

Minimum of the tank pressure fluctuations.

0.1 5 0.1 4 0.1 10 From 21/11/2012



Xe mixture supply blowing out.

Where was a few leaking channels [B43; C1; C4, C6] in which it was not possible to provide detector performance with minimum gas losses working in the loop. They were supplied with the gas from the gas system blowing out. Temporary set-up was assembled in USA15 and distribution part in UX-15.

It is needed to design and produce permanent Xe mixture supply with gas flow, pressure readout, implementation into gas control and DCS, alarms…(practically one more distribution rack + some equipment in USA-15).

Barrel M1, M2

St 1

St 2

St 3

St 4

leakOUTIN

Pressure

breaks

No leakNo leak CO2 in

leak CO2 in

Leak in 2 or more places

leak

Brake-through

compromise



Ar mixture supply blowing out.The decision to supply part of the TRT blocks with Ar based mixture could be taken. Gas system has to be ready for that.

Temporary set-up was assembled. It consists of the mixer in SGX-1 and distribution part in UX-15.

It is needed to design and produce permanent Ar mixture supply with gas flow, pressure readout, implementation into gas control and DCS, alarms…(practically another one distribution rack in the cavern + one more mixer in SGX-1).

AR DISTRIBUTIONAR MIXER

First priority tasks for to address TRT leaksNitrogen removal/recuperation system.

Envelop gas which comes to the gas system because if the leak consists some admixture of N2. Membrane module is not able to remove this N2.

Some modifications in the recuperation system gave possibility to replace gas in the gas system and clean gas from N2.

This was 100% manual operation.

Design and production of the nitrogen removal/recuperation system fully remote controlled is needed.


RUN 2011 0.3÷0.42%

RUN 2013

0.02%/day = 1 l/day

N2 concentration


Design and production of the nitrogen removal/recuperation system fully remote controlled is needed.




PRIORITY NEW

RACKS TRT INDIVIDUAL CHANNELS XE SUPPLY

BLOWING OUT . HIGH 2013 OCT

AR MIXTURE SUPPLY HIGH 2013 OCT ANALYZER FOR AR MIXTURE MONITORING HIGH 2013 NOV N2 REMOVAL MEDIUM 2014 SUMM USA15 – UX15 PRESSURE DIFFERENCE FOR

CIRCULATION PUMP OPERATION FEEDBACK

URGENT 2013 JUNE

EXIS. RACKS

PUMP URGENT 2013 JUNE DISTRIBUTION 1 DESIGN AND PRODUCTION OF

GOOD FLOW REGULATORS FOR ALL MANIFOLDS USED

IN GS

HIGH 2013

Distribution 2 REMOTE FLOW REGULATION FOR EACH

CHANNEL TRT 2014

Distribution 3 REPLACEMENT OF THE PRESSURE

TRANSMITTERS AT OUTPUT (PT 6X26) TO ± 10 MBAR

(3 PIECES NEEDED) URGENT

URGENT 2013 MAY

Distribution 4 MODIFICATION OF THE BACK-UP

SYSTEM TO MAKE IT SAFER (SEE FIG. 6) MEDIUM 2013 END

Distribution 5 REPLACEMENT OF SAFETY BUBBLERS

XBUB 6X42 AND XBUB 6X43 BY ONES WITH TWO

VOLUMES (6 PIECES NEEDED)

MEDIUM 2013 END

Distribution 6 REPLACEMENT OF BAD FLOW CELLS

AND INSTALLATION NEW ONES

LOW 2014 SUMM

Distribution 7 REPLACE FLEXIBLE PIPES IN BARREL

CH. 1-16 BY LONGER ONE.

LOW 2014 SUMM

Distribution 8 PREPARE EXHAUST FOR XE AND AR

FLUSHING CHANNELS HIGH OCT

PREDISTRIBUTION URGENT 2013 MAY MIXER MEDIUM 2013 SEPT EXHOUST MEDIUM 2013 SEPT MEMBRANE LOW 2014 RURIFIER LOW 2014 ANALYSIS1 LOW 2014 XE SUPPLY LOW 2014

PVSS

PRIORITIES.

Active gas system status. S.Konovalov, K.Zhukov. Active gas system operation. S.Konovalov "Active...

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