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Technical Discussions
Ramakrishnan Muruganantham
Ramakrishnan Muruganantham
01:44 Jun-12-2000
Helium Leak Test

A customer wants "High pressure helium test of valve body at 5725 psi (400 bar-approx). Test Duration: 10 minutes; No leakage permitted". The valves are required for hydrogen service.

We would like to know the following:

1. Is it required to do helium leak test at such a high pressure?

2. Is it technically correct to do leak test at above pressure (with respect to sensitivity)

3. Any advantages of doing such high pressure test?

4. Any alternate method for achieving the object of detecting any leak path?

5. Any international standard recommending correct procedure of helium leak test with pressurisatio method?

6. Is there any limitation on pressure with helium as test media.





    
 
 
Muthusamy
Muthusamy
06:14 Jun-14-2000
Re: Helium Leak Test
Since the system is meant for hydrogen service (very light gas)and other methods may not detect for small leaks, owner may be insisting for helium leak test. However, generally helium leak test by detector probe technique (pressurisation method)will not be much sensitive. Best results can be achived by (tracer probe technique) vacuum testing using helium mass spectrometer.



    
 
 
Muhammad naadeem Yasin
Muhammad naadeem Yasin
08:41 Sep-04-2000
Re: Helium Leak detector
September 1, 2000

Attn.: Export Manager

From: M. N. Yasin
Manager Sales

Subject: HELIUM LEAK DETECTOR

Dear Sir,

We are pleased to introduce ourselves as major indenter and importer of all kind of Machinery, industrial and laboratory equipment since last many years. We are enjoying a good market share due to dedicated pre sales and after sales services rendered by our skilled and qualified sales and service engineers.

We have an inquiry of an industrial boroscope with the specifications given at the end from our customer HMC III (Heavy Mechanical Complex 3 Taxila ).

You are requested to please advise us by return mail, if you are interested to participate in this tender so that to send you the further details.

Looking forward to have your favorable reply at your earliest, meanwhile please feel free to contact us for any further information or assistance that you may require.

Regards,

M. Nadeem Yasin
Sales Manager

HELIUM LEAK DETECTOR


1. Technical specification

1.1 Minimum detectable leak: 2x-10 atm-cc/sec.
On full scale: 10-5through 10-9atm-cc/sec
1.2 Helium response time: 0.5sec.
1.3 Maximum Pressure: 5 Torr (Fine test mode)& 15m Torr
1.4 Leak units: Selectable (atm-cc/sec, mbar-I/sec,
Torr-fI/sec, pa-m3/s)
1.5 Zero control: Selectable mode background offset with
unique
"Auto zero1.6 Calibration: Fully automatic tuning & calibration
routine an external or optional internal calibration leak.
1.7 Audio: Pitch controlled dedicated volume
control button programmable audio threshold.
1.8 Leak rate analog output: 0-10V selectable linear or log.

2. Standard Accessories

2.1 Spectrometer tube
2.2 Test port Vacuum Gauge
2.3 High vacuum pump (Turbo molecular pomp)
2.4 Sniffer probe vacuum gauge with power probe
2.5 Test port connection Kit
2.6 Remote pump connection
2.7 Dual Stage rotary vacuum pump
2.8 Remote I/O with RS232 interface
2.9 Maintenance Kit
2.10 Transport Trolley
2.11 Calibrated Helium leaks with valve pressure gauge & adopter
Refilling sniffing/evacuated leak

Ranges: i) 10-6/ 10-5 std cc/sec
ii) 10-7 //
iii) 10-8 //
iv) 10-9 //
v) 10-10 //

3.0 Optional Accessories

3.1 Gas line testing accessories for > 30M gas line
3.2 Helium gas cylinder or bottle
3.3 Helium spray probe kit to find exact location of lead
3.4 O ring kit
3.5 Spectrometer tube cleaning kit
3.6 Helium recovery system
3.7 Flexible Bellows 1000mm

4.0 Power Requirement

220V - 50Hz

5.0 Spare & Wear Ports

Three years operational spare & wear ports

6.0 Operational & Maintenance manual with complete circuit diagram

8.0 Operational & training of the equipment at

TERMS AND CONDITIONS:

· Prices must be on FOB/C&F basis
· Tender must be addressed to
Head Procurement
Heavy Mechanical Complex 3 (HMC-III),
Hattar Road, Taxila.
· Prices must be valid for 90 Days
· Quotationmust be in original (in triplicate) alongwith all necessary technical literature.
· Tender is due on September 24, 2000 and your offer must be here by the 18th of September so that to arrange the earnest money and other necessary documents.
· Please note that in case of award of the contract your company will have to submit a performance bond @10% of the quoted price that shall be valid for the guarantee period please note that we are arranging 2% earnest money by our selves.
· Please include our 20% hidden commission in quoted ex-works prices and confirm it in a separate cover letter.
· Please provide us an authorization certificate authorizing us to participate, and negotiate in this tender on your behalf



    
 
 
D. Feigenbaum
D. Feigenbaum
08:11 Nov-30-2000
Re: Helium Leak detector
: September 1, 2000


: Attn.: Export Manager

: From: M. N. Yasin
: Manager Sales

: Subject: HELIUM LEAK DETECTOR

: Dear Sir,

: We are pleased to introduce ourselves as major indenter and importer of all kind of Machinery, industrial and laboratory equipment since last many years. We are enjoying a good market share due to dedicated pre sales and after sales services rendered by our skilled and qualified sales and service engineers.

: We have an inquiry of an industrial boroscope with the specifications given at the end from our customer HMC III (Heavy Mechanical Complex 3 Taxila ).

: You are requested to please advise us by return mail, if you are interested to participate in this tender so that to send you the further details.

: Looking forward to have your favorable reply at your earliest, meanwhile please feel free to contact us for any further information or assistance that you may require.

: Regards,


: M. Nadeem Yasin
: Sales Manager


: HELIUM LEAK DETECTOR

:
: 1. Technical specification

: 1.1 Minimum detectable leak: 2x-10 atm-cc/sec.
: On full scale: 10-5through 10-9atm-cc/sec
: 1.2 Helium response time: 0.5sec.
: 1.3 Maximum Pressure: 5 Torr (Fine test mode)& 15m Torr
: 1.4 Leak units: Selectable (atm-cc/sec, mbar-I/sec,
: Torr-fI/sec, pa-m3/s)
: 1.5 Zero control: Selectable mode background offset with
: unique
: "Auto zero: 1.6 Calibration: Fully automatic tuning & calibration
: routine an external or optional internal calibration leak.
: 1.7 Audio: Pitch controlled dedicated volume
: control button programmable audio threshold.
: 1.8 Leak rate analog output: 0-10V selectable linear or log.

: 2. Standard Accessories

: 2.1 Spectrometer tube
: 2.2 Test port Vacuum Gauge
: 2.3 High vacuum pump (Turbo molecular pomp)
: 2.4 Sniffer probe vacuum gauge with power probe
: 2.5 Test port connection Kit
: 2.6 Remote pump connection
: 2.7 Dual Stage rotary vacuum pump
: 2.8 Remote I/O with RS232 interface
: 2.9 Maintenance Kit
: 2.10 Transport Trolley
: 2.11 Calibrated Helium leaks with valve pressure gauge & adopter
: Refilling sniffing/evacuated leak

: Ranges: i) 10-6/ 10-5 std cc/sec
: ii) 10-7 //
: iii) 10-8 //
: iv) 10-9 //
: v) 10-10 //


: 3.0 Optional Accessories

: 3.1 Gas line testing accessories for > 30M gas line
: 3.2 Helium gas cylinder or bottle
: 3.3 Helium spray probe kit to find exact location of lead
: 3.4 O ring kit
: 3.5 Spectrometer tube cleaning kit
: 3.6 Helium recovery system
: 3.7 Flexible Bellows 1000mm

: 4.0 Power Requirement

: 220V - 50Hz

: 5.0 Spare & Wear Ports

: Three years operational spare & wear ports

: 6.0 Operational & Maintenance manual with complete circuit diagram

: 8.0 Operational & training of the equipment at

: TERMS AND CONDITIONS:

: · Prices must be on FOB/C&F basis
: · Tender must be addressed to
: Head Procurement
: Heavy Mechanical Complex 3 (HMC-III),
: Hattar Road, Taxila.
: · Prices must be valid for 90 Days
: · Quotation must be in original (in triplicate) alongwith all necessary technical literature.
: · Tender is due on September 24, 2000 and your offer must be here by the 18th of September so that to arrange the earnest money and other necessary documents.
: · Please note that in case of award of the contract your company will have to submit a performance bond @10% of the quoted price that shall be valid for the guarantee period please note that we are arranging 2% earnest money by our selves.
: · Please include our 20% hidden commission in quoted ex-works prices and confirm it in a separate cover letter.
: · Please provide us an authorization certificate authorizing us to participate, and negotiate in this tender on your behalf




    
 
 
M. Fisher
M. Fisher
01:46 May-15-2001
Temperature effect
In helium leak test by bombing method, what is the effect of themperature change if the bombing made in low temperature and the testing of the leak made in high temperatura.


    
 
 

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