Sites: GlobalSpec.com | GlobalSpec Electronics | CR4 | Electronics360
Login | Register
The Engineer's Place for News and Discussion®

Previous in Forum: Temperature Drop Calculation on Liquid   Next in Forum: Intrinsical Safety Barrier and Isolation Barrier
Close

Comments Format:






Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







6 comments
Associate

Join Date: Aug 2008
Location: Dubai, United Arab Emirates.
Posts: 36

Level Gauge and Transmitter for Buried Vessels

04/18/2012 2:50 AM

Dear All, please advise me if there is any other best option for a Level Gauge other than Magnetic Type for a buried Vessel. And which would be the best option to go with for a Level Transmitter for the same, either top mounted Magnetostrictive Type or Guided Wave Radar Type. Magnetic Type seems to be difficult for maintenance and trouble-shooting for me. Thank you all in advance.

Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Comments rated to be Good Answers:

These comments received enough positive ratings to make them "good answers".

Comments rated to be "almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, rate them!
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain - possibly to become "South Scotland" or "Non-Caledonia" from September 2016. Kettle's on.
Posts: 22733
Good Answers: 588
#1

Re: Level Gauge and Transmitter for Buried Vessels

04/18/2012 2:59 AM
  • What is in the vessel?
  • At what temperature and pressure?
  • What is the material-of-construction of the vessel?
  • What is the size of the vessel?
__________________
"Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Register to Reply
Associate

Join Date: Aug 2008
Location: Dubai, United Arab Emirates.
Posts: 36
#2
In reply to #1

Re: Level Gauge and Transmitter for Buried Vessels

04/18/2012 3:28 AM

Thanks for your reply. Please find the details as below,

There are 2 vessels.

Contents : Amine, HC and Acid Gas / Heat Transfer Fluid (Shell Thermia Oil B) repectively.

Operating Pressure : 1.1 / 1.2 bara.

Operating Temperature : 135 / 170 Deg. C.

MOC : Carbon Steel / Carbon Steel.

Size (ID) : 2 / 1.5 metres.

Thank you once again.

Register to Reply
5
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain - possibly to become "South Scotland" or "Non-Caledonia" from September 2016. Kettle's on.
Posts: 22733
Good Answers: 588
#3
In reply to #2

Re: Level Gauge and Transmitter for Buried Vessels

04/18/2012 7:22 AM

The instrument would need to be an IP68-cased level transmitter suitable for the process fluids and temperature/pressure of operation, as a gauge could not be seen underground. It would need to be set-up and tested with the tank still exposed, probably filled with a test fluid such as water, which will need a lower temperature for the testing. That rules out capacitance as a measurement technique. The pressure is above ambient and if it and the temperature vary significantly, then ultrasonics will prove unreliable.

It's starting to look like magnetic follower or radar are measurement technique candidates, though it would be good if the housing containing the cable connections and any electronics could be separated from the tank thermally so it could operate at a lower temperature. If not, then some exotic transmission cable and gland types will be needed to withstand the temperatures; MICC cable will do it, as will pyro.

MICC and pyro do not lend themselves readily to hazardous area EEx i applications on the basis of energy storage without special considerations in circuit design. It would be better to go EEx de, if at all possible, if flammable gas/air mixtures are inside the tank, and use regular SWA cables with appropriate glanding.

Hopefully there are some pointers here.

__________________
"Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Register to Reply Good Answer (Score 5)
Guru

Join Date: Dec 2005
Posts: 1552
Good Answers: 17
#4

Re: Level Gauge and Transmitter for Buried Vessels

04/19/2012 9:56 AM

IF the tank is vented, could you use a very low volume bubbler, and measure the reflected back pressure to measure the liquid level? Air flow would be on the order of 2 to 5 cubic feet per hour, so no velocity impact to the back pressure in the piping. Transmitter could be located remotely in a safe enclosure.

__________________
Eventually, one needs to realize that it is far less important to be the smartest person in the room than it is to sit next to that person and make friends.
Register to Reply Score 1 for Good Answer
Power-User

Join Date: Dec 2010
Location: Tulsa, OK
Posts: 184
Good Answers: 2
#5

Re: Level Gauge and Transmitter for Buried Vessels

04/19/2012 11:52 AM

Further on what has already been asked, please send a detailed description of the product to be measured, like what it is, specific gravity or density, special considerations.

Also indicate if the tank is pressurized, if there are more than 1 product in the vessel, example like oil and water, if there is an interface measurement, the dimensions of the tank, other wise the answers besides being sarcastic will be useless.

Register to Reply
Participant

Join Date: Apr 2012
Posts: 1
#6

Re: Level Gauge and Transmitter for Buried Vessels

04/23/2012 10:55 AM

Hi there,

The Siemens Sitrans LR250 radar level transmitter would most likely be ideal for this application. Here is a contact for the level measuring expert in India:

Mr. Sandeep Vaida, Siemens Sensors and Communication

CR4 Admin - email address removed

From the CR4 Rules: Do not post phone numbers or email addresses. The CR4 Admin will delete all phone numbers and email addresses posted in threads or comments. You can share this information via the CR4 internal messaging system.

Register to Reply Off Topic (Score 5)
Register to Reply 6 comments
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Comments rated to be Good Answers:

These comments received enough positive ratings to make them "good answers".

Comments rated to be "almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, rate them!
Copy to Clipboard

Users who posted comments:

lightning.arrester (1); PWSlack (2); Radarman (1); Ried (1); vargaalex (1)

Previous in Forum: Temperature Drop Calculation on Liquid   Next in Forum: Intrinsical Safety Barrier and Isolation Barrier