Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations TugboatEng on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Steam Turbine Foundation Bolts Grouting

Status
Not open for further replies.
Syed_Osama

Syed_Osama

Mechanical
Joined
Apr 4, 2018
Messages
5
Location
PK
Hi,

I'm a relatively new member here.

I wanted to ask if anyone could explain technical reasons for the following:

1. Filling sand only in foundation bolt pockets for through and through foundations bolts of steam turbine.

2. Grouting foundations bolts for blind pockets.

Thank you.
 
Sort by date Sort by votes
You MUST FOLLOW the turbine manufactoroer's exact requirements for the mounting bolts and foundation alignment, mass, and reinforcement.

We've had several muti-MegaWatt turbine-generators break apart under load when foundations and mounts failed.
 
Upvote 0 Downvote
I'm currently working on erection of Steam Turbine at site, and have followed the exact requirements of the manufacturer, which was to fill the foundation bolt pockets with sand only and not filling in the grout material. The bolts are through and through in the foundation.

I wanted to know why are they not grouted, whereas, bolts fitted in blind pockets are grouted.
 
Upvote 0 Downvote
Have you asked the manufacturer, why they recommended filling the bolt cavities with sand???

Jim
 
Upvote 0 Downvote
Syed_Osama:
#1. Holds down rigidly, but allows some movement laterally, for thermal or vib. damping
movement.
#2. Holds down and laterally rigidly.
The above is my bet…, so as Jimstructures suggests, asked the manufacturer for their reasons.

 
Upvote 0 Downvote
dhengr:

I did ask them, but didnt receive any more detailed answer than what you have given, and was the same as your point 1.

However, what i dont understand is that once the turbine base frame is grouted, its fixed on all sides, then how is lateral movement still possible at all?

Secondly, why is there no need of allowing lateral movement when placed on ground with bolts grouted?
 
Upvote 0 Downvote
Thermal expansion would be one reason for movement post install.
 
Upvote 0 Downvote
Agent666:

Thermal expansion of what, bolts? because after grouting, the turbine is fixed from all sides. If expansion occurs, it has to occur in the grouting material first to allow turbine base frame to expand subsequently.

And if the expansion is indeed for the bolts, why is it not required in the ground foundation with blind holes?
 
Upvote 0 Downvote
Sorry, I meant thermal expansion of the piece of plant. I'm making the assumption that a, steam Turbine has a wide non operating and operating temperature range.
 
Upvote 0 Downvote
Status
Not open for further replies.

Similar threads

hamza41
  • Locked
  • Question Question
Section reinforcement using bolts
Replies
8
Views
5K
hamza41
hamza41
icebloom
  • Locked
  • Question Question
Welding of high strength grade 8.8 steel bolts
2
Replies
29
Views
4K
icebloom
icebloom
Supun93
  • Locked
  • Question Question
Plate Connection with Bolts
Replies
5
Views
878
SWComposites
SWComposites
beautifulhills
  • Locked
  • Question Question
Hollo bolts
Replies
7
Views
679
phamENG
phamENG
gbstanciu
  • Locked
  • Question Question
Transversal cracks carbon steel - steam line
Replies
19
Views
1K
Dhurjati Sen
Dhurjati Sen

Part and Inventory Search

Sponsor

Back
Top