Calibrated bags to measure gas leakage (Newsletter #4)

The Board will decide upon revised methodology AM0023 concerning leak reduction from natural gas pipeline compressor or gate stations. The revision would expand the permitted techniques to measure the flow of gas leaks in natural gas transmission and distribution systems to two more techniques:

(i)             the calibrated bags technique

(ii)            the ultrasonic flow meters technique.

While CDM Watch has no major doubts about the ultrasonic flow meters technique which sends ultrasonic signals across a pipe at an angle, there are serious concerns about the calibrated bags technique. Here, an anti-static bag measures the leakage by timing the bag expansion to full capacity. The measurement is repeated on the same leak source numerous times (at least 7, typically 7 to 10 times) in order to ensure a representative average for the fill times. CDM Watch does not believe that gas leakage can seriously be calculated with the calibrated bags technique, especially when not applied on a regular basis but only by inflating the bag 7-10 times on the same day, while the leakage of gas can vary on different days due to external factors, such as temperature, air pressure and moisture. If at all, the technique should only be used if implemented in regular intervals to avoid gaming by project developers..

Action to be taken by the Board:  CDM Watch recommends the Board to adopt the ultrasonic flow meters technique and to reject the calibrated bags technique.

Author

Related posts

Taylor Swift and private jet

Taylor Swift and the top polluters department

Taylor Swift claims she can offset the immense carbon footprint of her private jet but the only way for high-flying celebrities and the superrich to reduce their climate impact is to fly less and choose more sustainable forms of transport.

COP28: Article 6 failure avoids a worse outcome 

Torn between countries demanding that Article 6 carbon markets be available with virtually no restrictions and countries insisting on upholding transparency, human rights, and climate ambition, negotiators at COP28 failed to break the deadlock. With all the unresolved problematic issues, the fact that they reached no deal was better than agreeing to a bad one that would torpedo the Paris Agreement.

Join our mailing list

Stay in touch and receive our monthly newsletter, campaign updates, event invites and more.