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Steam Turbine Foundation Bolts Grouting

thread725-443874

Steam Turbine Foundation Bolts Grouting

Steam Turbine Foundation Bolts Grouting

(OP)
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.

RE: Steam Turbine Foundation Bolts Grouting

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.

RE: Steam Turbine Foundation Bolts Grouting

(OP)
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.

RE: Steam Turbine Foundation Bolts Grouting

Have you asked the manufacturer, why they recommended filling the bolt cavities with sand???

Jim

RE: Steam Turbine Foundation Bolts Grouting

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.

RE: Steam Turbine Foundation Bolts Grouting

(OP)
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?

RE: Steam Turbine Foundation Bolts Grouting

Thermal expansion would be one reason for movement post install.

RE: Steam Turbine Foundation Bolts Grouting

(OP)
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?

RE: Steam Turbine Foundation Bolts Grouting

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.

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