Contact US

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!

*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

Fire Case for Atm. Storage Tanks

Fire Case for Atm. Storage Tanks

Fire Case for Atm. Storage Tanks

I was wondering if you need to consider the fire case for storage tanks that are at atm. pressure?  I was talking to some maintenance personal and they think maybe we need one for our silicone storage tank although it is atmospheric.


RE: Fire Case for Atm. Storage Tanks

It is a requirement of NFPA 30. Using the 2000 edition, section states Every aboveground storage tank shall have emergency relief venting in the form of construction or a device or devices that will relieve excessive internal pressure caused by an exposure fire.

If your silicone is a class IIIB combustible liquid, and the tank volume is 285 bbl. or greater, an emergency vent is not required so long as the tank is not located in the same dike or drainage path of tanks that contain class I or II liquids.

RE: Fire Case for Atm. Storage Tanks

The tank volume is very small (160 gallons).  The tank has a breather on it, but not any type of relief valve.  I don't think silicone is too much of a flammable liquid.  Do I still need on?  There is a relief valve on the discharge side of the pump moving the fluid out of the tank.  The tank is also construcied of polyethylene.  Would that be the construction relief of pressure?


RE: Fire Case for Atm. Storage Tanks

The API 2000 committee issued a interpretation several years ago. The question that was asked was: "I have a 100 gallon tank. Is an emergency vent required?" The committee's answer: Yes.

You should review the flash point and boiling point data to make a determination as to the classification of the liquid (e.g., Class IA, IB, IC, II, IIIA or IIIB).

Without the liquid's classification I can't tell you if a PE tank would be acceptable using NFPA 30. NFPA 30 does allow combustible aboveground storage tanks for Class IIIB liquids so long as:

A) The tank is in an area not exposed to a spill or leak of Class I or II liquids, and
B) The tank is approved by the authority having jurisdiction. (NFPA 30, section 2.2.2 (b))

If this tank is in the US, you should ensure that you have the approval of the authority having jurisdiction (e.g., fire marshal).

One could consider that because the PE is a low melt point material that the tank emergency vent is by form of construction. This is assuming that this is a vertical tank. However, this is too important of a safety issue. Emergency vents are cheap.

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! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close