Design of Sliding Saddle for a Pressure Vessel

[Abdulwaheed]

Hi,

I'm currently in a dilenma as regards design of slidling Saddle for a Vessel.

Vessel Size is 2450mm Inside Diameter by 7900mm T/T Length. Design Temperature is between -46/150 Deg C.

Normal Practice I'm familiar with is providing a sliding saddle anchored into the concrete foundation with the aid of anchor bolts with two stoppers at the end. The saddle baseplate sits on this and can slide freely as a result of thermal expansion.

However, the current Vessel is supposed to come as a skid. The Saddle is sitting on a Stool. I am contemplating the following options.

1. Providing Vertical Slotted Holes on the Sliding Plate with the Saddle Bolted to the Stool allowing for movement resulting from thermal expansion.

2. Welding the Sliding Plate (with stoppers at both end) to the stool (Or using the stool as a sliding plate itsself adding stoppers to both end) and the saddle sitting in it.

Looking forward to any advice I can get based on the info giving above.

Thank you.

 

[gr2vessels]

Vertical Slotted holes on a sliding plate, for a horizontal vessel? Can you upload a quick sketch?

 

[Abdulwaheed]

Find attached Sketch for the Sliding Saddle Detail.

Looking forward to your advice/comments.

Thank you

 

[gr2vessels]

OK, I now understand, the slots are not carved on the edge of the baseplate. Normally, you don't need any additional sliding plate, you can slot the baseplate.
This is a typical sliding baseplate, a standard saddle by the look of it. Any addition will only complicate the operation and increase the service requirements.
In order to reduce the friction between saddle and stool (even thought you have designed the saddle for a friction factor of miu=0.3), you can grease the bottom of the baseplate or better still, fit a sliding/anti-friction sheet between the baseplate and the stool (PTFE). I believe the stool(s) are fixed and designed to take the load, hence the bolting on the sliding saddle will only be finger tight.
Hope this helps,
gr2vessels

 

[Abdulwaheed]

You've been More than Helpful.

Thank you.