[knives]

Hi,

Anyone here had experience supporting their small bore piping from structural grating floor? I’m basically talking about relatively low load (say small drain connections routed to collection point). I have seen a few standard drawing from an EPC company where they are clipping the base plate of dummy base, inverted L-type and T-type support on the grating floor. Not sure if they’ve done the same way for piping underneath the floor. How about having a modified floor penetration toe plate serving as stopper to avoid riser piping from slipping down? Any thoughts are welcome.

[James Pennock]

Knives,
If the project were mine (as owner) and this question came up I would want the Grating to be removable for maintenance without the need to disassemble any small or large bore piping. This would apply for multiple story structures for on-shore plants and for Off-shore Rigs.

Just my opinion,
Jop

[knives]

Thanks Jop, I agree that this type of support should not be place where grating removal is expected so I guess if ever this type of support is applied, the criteria should be agree with the owner and clearly indicated in support standard drawing. One of the reason I would like to keep this an option for our project is to reduce welding and touch-up paint work for any supplemental beam that may be needed to provide support point for base support above structure, We are also trying to manage the weight to as light as possible because the unit is modularised and additional structural beam here and there would definitely contribute to the increase of module weight.

[James Pennock]

Knives,
I understand your motive for doing this and I suggest you “Cover” your self.
1. Talk to the Structural Engineer (for your project) about your need and potential for doing this.
2. Determine the material of the Grating (Gratings are available in an array of materials such as: steel, aluminum, fiberglass, powder-coated steel, stainless steel and galvanized steel.)
3. With the Structural Engineer look into the Load Tables (example below) for the actual Grating to be used on your project
4. You and the Structural Engineer draft a memo of understanding addressed to the Client explaining the situation, the need, the solution and the potential ramifications. Get the Client to sign that Memo.
5. Make sure you only do this where the concentrated Dead Load is below the limits of the Grating used on the project.
6. Limit the number of times you do this

Example Steel Grating Load Tables – http://www.mcnichols.com/?pageCode=electostelt

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