Pipe Support - Anchoring Question
Pipe Support - Anchoring Question
(OP)
Hi,
Please redirect this thread if it is not in the correct category.
Is there a general rule of thumb for the length of the anchor that must be in the concrete for pipe supports?
Is it common practice to grout a piping support?
Thank you
Please redirect this thread if it is not in the correct category.
Is there a general rule of thumb for the length of the anchor that must be in the concrete for pipe supports?
Is it common practice to grout a piping support?
Thank you






RE: Pipe Support - Anchoring Question
What you use for a 15 foot tall vertical only pipe support holding a 10 inch pipe is going to be significantly different than what you use for a 2 inch pipe directional stop cantilevered off a building column or a 42 inch overland pipe.
RE: Pipe Support - Anchoring Question
It is an 18 inch pipe, never higher than 4 feet from the ground. Supports are anchored in concrete. Type of support is horizontal standard beam welded on two verticals. I understand that the anchors minimum diameter and minimum length drilled in concrete can be calculated with loads, but pipefitters in the industry rarely use engineering plans to make the supports. I hope without getting in core calculations there is a common practice of the size of bolts and length drilled in concrete.
Also for my second question if grouting base of support is common practice ... does it depend on loads?
Thanks,
RE: Pipe Support - Anchoring Question
You did not ask about the number of anchor bolts for each independent support. IMHO, one anchor bolt is almost never a good idea. Use at least two; for a vertical support, four anchor bolts are commonly used.
Length of the anchor bolts also depends on the concrete thickness. Anchorage to a 6 inch thick concrete slab would be treated differently than anchorage to a 6 ft. thick concrete mat.
Spacing of anchor bolts, because of concrete properties, is another consideration.
Your question about grouting the base of a support is a little easier to answer. Again, IMHO, grouting is a good idea. The grout helps protects the anchor bolt / concrete interface area from corrosion. A good idea in an industrial application, which is what I assume you are working with. For light to moderate loads grout has nothing to do with load carrying capability. For heavy loads, grout is essential... and must be correctly installed to perform adequately.
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RE: Pipe Support - Anchoring Question
2. If you're setting the base plate on leveling nuts, the compressive strength of the grout doesn't matter. If not, then it does.
RE: Pipe Support - Anchoring Question
I’m not aware of any rules-of-thumb for something like this, as mentioned above. There are just too many things to consider, in a proper pipe support design. It sounds like there is a serious need for some experience on this subject in your office. There is judgement, knowledge and an understanding of the potential problems which comes with doing hundreds of these designs which finally allows an experienced designer to make some determinations without a complete detailed design of every support detail. Rules-of-thumb in the hands of pipefitters can be dangerous, real design experience and good sound judgement is good.
RE: Pipe Support - Anchoring Question
I dont know if you have any information of horizontal loads... But you cant do this.
- Use 4 3/4" bolts (minimum size of bolt for industrial use)
- If is preinstalled 12d length in concrete... if post-installed use hilti manual.
- Grout is for leveling.... you probably can level the support without grout because are small supports (4 feet)
RE: Pipe Support - Anchoring Question
It's not usually a difficult engineering problem (there are exceptions when you have excessive anchorage loads or weird seismic arrangements of the system) but it's something that needs to be looked at properly.