Equipment grouting 1

[sharingamak]

Hello,
in a project we have a vertical static vessel to be grouted, in my previous project, the contractor grouted all the foundations area, but in my actual project, the contractor suggested just a ring as illustrated in the attached picture.
is there any impact or difference in just grouting a ring instead of all the top of the foundation
Thank you

 

[mk3223]

IMO, it should be okay to only grout the baseplate ring of the anchor bolts.
To grout the whole surface of the foundation is just for a cosmetic appearance to me and a waste of money.

 

[wannabeSE]

The answer requires engineering (or engineering judgement), dimensions and loads. Without knowing more, I would say if everything works with a baseplate with the same shape as the proposed grout works, then the proposed grout probably works. Is this a heavily loaded post/leg for vessel? Or is this the bottom of a tank?

 

[TLHS]

Depending on the situation, when you do a grout ring you may want to provide a drainage channel so that you don't end up with a puddle of water from condensation or other sources.

If it's a vessel with a skirt you may not even have a full base plate and may just have the ring.

 

[Tomfh]

The proposed grouting may well work, but given the deficiencies I've seen in supposedly 100% grouted baseplates I'd be wary of allowing them to aim at 50%.

 

[BAretired]

How does the contractor propose to form the inner ring? And how does anyone inspect it when grouting is finished?

BA

 

[Tmoose]

Is the octagon the vessel's bottom plate foot print?

What do the manufacturer's installation instructions say to do?

 

[MotorCity]

You will need input from the tank manufacturer. The tank designer may have assumed a fully supported tank bottom. Otherwise, the tank bottom may not be capable of spanning between the grout pad

 

[Agent666]

For the reasons BAretired stated, seems like the half finished grouting is simply opening up more avenues to get it wrong. A competent contractor familiar with grouting should not really have any issues grouting the entire area. In practice with a flowable/pourable grout I don't see any advantage in doing the ring unless the baseplate is also a ring? (unsure if you are implying this or not as a by product of going to the ring?)

 

[TLHS]

Bases of vertical vessels are often skirts, often have rings, and often have access to the skirt for inspection. This would not be an overly unusual situation.