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

Fire water storage tank roof structure bolting

Fire water storage tank roof structure bolting

Fire water storage tank roof structure bolting

Kindly guide me for the requeremet of tank roof structure bolt tightening.

As drawing not showing any torquing requeremet not ITP. Even API 650 also not giving such cleraity for torquing requeremet for the roof structure members.

So, Please advise me os there any torquing requeremet for the roof structure bolts or tightening with impact wrench machine is ok

RE: Fire water storage tank roof structure bolting

First, you should be asking the roof designer/manufacturer this, not the Internet.

Second, the usual rule is that if the bolts need to be pretensioned (turn-of-nut, torqued, etc.) then the drawing should say so, along with the acceptance criteria. When the drawings say nothing then AISC would default to snug tight bolts which are defined as:
  • The snug tightened condition is the tightness that is attained with a few impacts of an impact wrench or the full effort of an ironworker using an ordinary spud wrench to bring the plies into firm contact.

RE: Fire water storage tank roof structure bolting

May add DTI washer to the bolting to facilitate the structure installation and inspection.

RE: Fire water storage tank roof structure bolting

I have asked my engineering team and they told torquing not required as It is low load static structure.

But one client inspector raising the concen

RE: Fire water storage tank roof structure bolting

The bolts apparently snug tight as Geoff13 (Structural) stated. However there is another problem...the snip picture of the roof structure shows the main supporting members are trusses and these trusses supporting the rolled section rafters.
The vertical bracings are visible ..however , i could not see horizontal bracings...

The roof structure erected on scaffolding and shall be checked for horizontal bracing before dismantling the scaffolding.
The picture below depicts the typical roof bracing...

RE: Fire water storage tank roof structure bolting

I've seen your problem myself. Inspectors want a torque, or a DTI, or a turn-of-nut, so they have something to inspect. With the standard snug-tight installation there's nothing to inspect, other than "Are the plies in firm contact?".

However if snug tight bolts are all that's needed for a design (and that's probably 99% of structural bolts) then all these other methods are just wasted manhours and dollars.

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


White Paper - Strategies to Secure Connected Cars with Firewalls
White-hat hackers have demonstrated gaining remote access to dashboard functions and transmissions of connected vehicles. That makes a firewall a vital component of a multilayered approach to vehicle security as well as overall vehicle safety and reliability. Learn strategies to secure with firewalls. Download Now
White Paper - Model Based Engineering for Wire Harness Manufacturing
As complexity rises, current harness manufacturing methods are struggling to keep pace due to manual data exchanges and the inability to capture tribal knowledge. A model-based wire harness manufacturing engineering flow automates data exchange and captures tribal knowledge through design rules to help harness manufacturers improve harness quality and boost efficiency. Download Now
White Paper - What is Generative Design and Why Do You Need It?
Engineers are being asked to produce more sophisticated designs under a perfect storm of complexity, cost, and change management pressures. Generative design empowers automotive design teams to navigate this storm by employing automation, data re-use and synchronization, and framing design in the context of a full vehicle platform. Download Now
eBook - Simulation-Driven Design with SOLIDWORKS
Simulation-driven design can reduce the time and cost of product development. In this engineering.com eBook, we’ll explore how SOLIDWORKS users can access simulation-driven design through the SOLIDWORKS Simulation suite of analysis tools. 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