How Does a Sample Cylinder Fill?
There are many factors to consider for liquid sampling. That's why we put together a five-part Ask Swagelok video series that discusses the importance of maintaining proper vapor space compression, the role of outage tubes, how vapor space is affected by sampling system design, and what you need to know to minimize the risk of cylinder rupture.
In the second video, fluid sampling expert Matt Dixon discusses how a sample cylinder fills and what users should know about that process.
Video Transcript
LUCAS TREU:
Hi, I'm Lucas Treu, and this is Ask Swagelok. I'm at the Solon Tech Center with Matt Dixon, one of our fluid sampling experts, and we're talking about liquid sampling into metal cylinders. So Matt, how does the sampling cylinder actually fill, and what do you wish people understood about that process?
MATT DIXON:
When you're filling a sample cylinder with liquid, you typically orient the cylinder vertically. The supply pressure is connected at the bottom, so the cylinder fills from the bottom up.
What people often don’t realize is that you also usually have a return pressure. That means the cylinder is also filling from the top down—at least initially. So you have liquid entering from both the bottom and the top, which compresses the vapor space inside the cylinder.
Understanding that is important because it helps determine the final size of the vapor space at the end of the sampling operation.
LUCAS TREU:
Yeah, that makes sense. Thank you. And thank you all for joining us for Ask Swagelok.
