×
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

Tank bottom / foundation interface water ingress protection

Tank bottom / foundation interface water ingress protection

Tank bottom / foundation interface water ingress protection

(OP)
I am looking for API Std or RP requirements regarding tank bottom / foundation interface water ingress protection in order to specify criteria for a durable protection.
Could somebody help me ?

RE: Tank bottom / foundation interface water ingress protection

If this is an API 650 field erected tank, crown the center to the outside as the standard recommends in Appendix B.
This will assist in drainage. If you have an tank bottom annular ring, make sure you are specifying a concrete retaining ring.
Also, select a contractor that has experience in construction of tank foundations and pads.

RE: Tank bottom / foundation interface water ingress protection

Hi,

Additional to FTank's comments above, if you use a cone down foundation you can install tell-tale leak detection pipes in the foundation (in accordance with Appendix I, and as long as the pipes are kept free from debris and dirt any water underneath the tank should drain via the leak detection system.

Further to that I am not aware of any API standard or RP requirements but generally we ensure that the tank foundation is sufficiently above the compound floor  (i.e. 0.3 - 0.5m above the main compound).

The other thing is to seal the floor plate projection (chine plate) to the foundation. There are a number of products on the market for this i.e. Shell Tixophalt, SikaTank, etc. We generally use Tixophalt, and paint it with an aluminium reflective paint to prevent it from prematurely failing due to UV.

There are also other products such as the Denso "Tank Boot" systems. However we have found that these systems tend to hold dirt and moisture unless they are regularly cleaned.



 

RE: Tank bottom / foundation interface water ingress protection

(OP)
Thanks a lot for your help.
In the mean time I have found an answer for the protection in API 650 11th Ed Art 5.4.5 and Fig 5.5  and for the sealing in Appendix B Fig B.1;
Regarding the protection system, I am more looking for an aluminium drip ring protection fitted outside on the shell about 0,15 m above the annular bottom plate, removable without any damage, it is more expensive but gives a better protection of the whole outside bottom plate and concrete annular ring, easily inspectable and more durable

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