×
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

Plastic Liner Between Outdoor Flat Bottom Tank and Concrete Slab

Plastic Liner Between Outdoor Flat Bottom Tank and Concrete Slab

Plastic Liner Between Outdoor Flat Bottom Tank and Concrete Slab

(OP)
We are going to install several flat bottom carbon steel tanks (approx. 15 ft diameter) on a big concrete slab at a outdoor environment. The liquid stored in the tanks is not corrosive. The tank bottom (exterior) has been painted already. I wonder:

(1) if there is need to put a layer of plastic liner on the top surface of the concrete slab under the tank bottom. Would this provide extra help on reducing the corrosion? If we do need, what is the material and thickness that are normally used?

(2) if there is need to seal the tank bottom edge on the concrete? This will help to prevent (or at least reducing) rain water from leaking into the space under the tank bottom. If it can help too, what is the sealant that is normally used at this application?

Thanks.

RE: Plastic Liner Between Outdoor Flat Bottom Tank and Concrete Slab

A layer of 1/2 asphalt expansion joint material is commonly used as padding on a foundation- ASTM D1751, if I remember right.  Caulking used at the edge can vary- Sikaflex is one brand I've seen.

RE: Plastic Liner Between Outdoor Flat Bottom Tank and Concrete Slab

Ditto to JStephen's reply.  Asphalt impregnated material will repel moisture and provide a better cushioning effect for eneven surfaces, plastic will encourage condensation and corrosion.

RE: Plastic Liner Between Outdoor Flat Bottom Tank and Concrete Slab

That should be 1/2" THICK asphalt material, by the way.

RE: Plastic Liner Between Outdoor Flat Bottom Tank and Concrete Slab

(OP)
Thank you very much for the information. It looks very reasonable to me.

When I looked for the asphalt impregnated expansion joint material, I found many that meet the ASTM D994 standard. Can I use this ASTM D994 material?  I don't know the difference between ASTM D994 and ASTM D1751.

Is there any drawback(s) of using this 1/2" thick asphalt impregnated sheet under the tank, except extra cost? Is this a popular way for putting steel tank on the concrete slab?

Thank you.

RE: Plastic Liner Between Outdoor Flat Bottom Tank and Concrete Slab

I would think that the joint compound would tend to extrude under the weight of the tank - of course depending on the mass of the tank, how stiff the tank is, and how long the joint compound is allowed to set before the tank is filled.

ISZ

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