Did you replace the spring washers?  If they've lost their spring the valve will leak.
Good luck!

Janice Jones
Brzezinski Silicon Cycling Lab
Marine Science Institute
UC Santa Barbara
Santa Batbara CA  93106

On Thu, Oct 29, 2020 at 11:45 Swart, Peter K <[log in to unmask]> wrote:

Check that the air pressure lines are not leaking.  They frequently get pin holes in them causing them to leak and I have mistakenly replaced the gold stamps when in fact the problem was  a leaking air pressure line.


From: Stable Isotope Geochemistry <[log in to unmask]> On Behalf Of Wei Huang
Sent: Thursday, October 29, 2020 1:02 PM
To: [log in to unmask]
Subject: [EXTERNAL] [ISOGEOCHEM] Both Kiel lines leak at the same time


CAUTION: This email originated from outside the organization. DO NOT CLICK ON LINKS or OPEN ATTACHMENTS unless you know and trust the sender.


Dear all,


Last week, line 1 of our Keil device leaked. The problem was solved by cleaning and replacing valve 13. This Monday, both lines leaked suddenly at the same time. I cleaned and replaced the gold stamp, gold gasket and the membrane of valve1. I thought the problem was solved, because everything was back to normal in the following two days. Both lines leak rates were low <500 ubar/min. CO2 yields were reasonable, and the isotope values of the standards were good, too. However, it happened again this morning. The leak tests couldn't pass for both lines suddenly at the same time. 


I realized that the VM1 couldn't be pumped down as low as before. I opened/closed valve1 a few more times, and then VM1 could be pumped down low. Now, I just ran a few test samples and they went very well. So, it looks like the problem is still on valve1. Is there anything I need to check before I open the valve1 again? I don't want to waste another set of gold stamp, gold gasket and the membrane. They are pretty expensive. Or is it possible that something went wrong with the valve block? 


I appreciate any advice you may offer! Thank you!



Wei Huang

Stable Isotope Lab Manager

Lamont-Doherty Earth Observatory of Columbia University

61 Route 9W

Palisades, NY 10964

Lab: 845-365-8143

[log in to unmask]



Janice L. Jones
Research Specialist
Marine Science Institute
University of California
Santa Barbara, CA  93106
Phone:  (805) 893-7061
Fax:  (805) 893-8062
Email:  [log in to unmask]