×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

How to hydrotest the tank designed to storage liquid SG=1.5

How to hydrotest the tank designed to storage liquid SG=1.5

How to hydrotest the tank designed to storage liquid SG=1.5

(OP)
I am working on the design of a tank in according with API 650 to storage some chemical with SG = 1.5.

I just doubt how can I hydrotest it?
Can I use some other liquid such as salt water etc?
I doubt the corrosion problem caused by salt water.

Thanks
 

RE: How to hydrotest the tank designed to storage liquid SG=1.5

Just hydrotest with water like normal.  It's not feasible to stress the shell above the product stress level as in a petroleum tank, so you don't try.

RE: How to hydrotest the tank designed to storage liquid SG=1.5

(OP)
thanks JStephen.

The SG of product inside the tank is about 1.5.
It is for petroleum plant, however it is not used to storage petroleum product.

Do you have another ideas?

RE: How to hydrotest the tank designed to storage liquid SG=1.5

I suggest that you increase the level of RT and MT in recognition that hydrotest will not produce high stress levels.

Joe Tank

RE: How to hydrotest the tank designed to storage liquid SG=1.5

That is not an uncommon situation, typical with acid, caustic, fertilizer, molasses, sulfur, etc.  And normally, the tanks are just hydrotested like normal.

A similar situation occurs when you add corrosion allowance.  The hydrotest will stress the as-built shell higher than a light petroleum product will, but likely still won't reach the design stresses due to the extra material.

If the contents were especially hazardous, you could increase RT as Joe suggested.  If it was a very small tank, you could actually overfill and/or pressurize the tank.  You could add 50% extra shell height as freeboard, and then operate at 2/3 the shell height, but I've not seen this actually done in practice.  The problem then is that somebody somewhere is likely to fill the tank up beyond the 2/3 point anyway, so you may be creating a hazard rather than reducing it.

RE: How to hydrotest the tank designed to storage liquid SG=1.5

Also consider this: Since here the operating weight is more than the hydrotest weight, for checking tank settlement it is better to increase the freeboard.
And for hazard situation, an overflow nozzle might solve the problem.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources