from the Forum department...
Difference between drain and vent
Engineering and workplace issues. topic
Posted by Saeid on 13 July, 2009 - 3:11 pm
I am working on an oil project and I am preparing some datasheets. I want to know differences beween vent and drain (if any) in instruments such as gauges?

Kind answers is appreciated.

Posted by Oliver77 on 13 July, 2009 - 9:56 pm
Well, you vent trapped air/gases and you drain trapped liquids (depending on applications).

For example consider dP transmitter/gages--
for liquid applications, there is a vent screw/hole somewhere in the sensor body that may be used to release the trapped air/gases at the diaphragms of the sensor.

For gas applications, there is a drain screw/hole somewhere in the sensor body that may be used to release the trapped liquids/condensates at the diaphragm of the sensor.

Why do you want to vent and/or drain? Because the trapped gases or liquids may introduce errors in the sensor readings.

Posted by Allan Evans on 14 July, 2009 - 12:23 am
Vent goes up.
Drain goes down

Posted by sushant chanana on 14 July, 2009 - 7:17 am

Vent is generally for removal of air bubbles & Non condensable gases & drain to remove condensates like in pneumatic air.

Sushant Chanana

Posted by Saeid on 14 July, 2009 - 12:21 pm
Thanks for your very useful information.

Your use of this site is subject to the terms and conditions set forth under Legal Notices and the Privacy Policy. Please read those terms and conditions carefully. Subject to the rights expressly reserved to others under Legal Notices, the content of this site and the compilation thereof is © 1999-2014 Nerds in Control, LLC. All rights reserved.

Users of this site are benefiting from open source technologies, including PHP, MySQL and Apache. Be happy.

There are two types of people in this world, good and bad. The good
sleep better, but the bad seem to enjoy the waking hours much more.
-- Woody Allen
Advertise here
Servo, steppers, analog, digital & web HMI - Fully Integrated!
Servo, stepping motor control, analog & web HMI in one system!
164-page eBook free download - EtherCAT Applications Guide
Time to incorporate data handling, web HMI and motion in one system!
View free setup and multi-vendor EtherCAT demo videos online
our advertisers
Help keep our servers running...
Patronize our advertisers!
Visit our Post Archive