Pipe shoe not laying flat on I beam 4

[jayinwww]

We are building modules and one of our 16" sch 40 lines from the fab shop has the pipe shoes slightly off center. The shoe rests on the beam on one side but the other side the shoe is off the I beam about 1/8" 3mm. They said 1/8" is the tolerance but I don't see any tolerance given in any code? Is this just a rule of thumb?

 

[racookpe1978]

You need to provide a picture of the shoe, as it is actually installed. (Show the side view, and an end view (axial alignment) please). Without context, the measurement difference cannot be analyzed.

However, if the tolerance is given by the customer, and your pipe fab is not per the customer's specification, then you must appeal to the customer. Not us.

 

[pennpiper]

jayinwww,
You wrote:
"They said 1/8" is the tolerance but I don't see any tolerance given in any code? Is this just a rule of thumb?"
They must be referring to the PFI-ES3 Pipe Fabrication Tolerance
PFI is the Pipe Fabrication Institute, If you have never heard of them and do not have there Standards then you should look here:

https://pfi-institute.org/products

Regards,
Jop

Sometimes its possible to do all the right things and still get bad results

 

[DGrayPPD]

Keep in mind that according to PFI-ES 3 the tolerance for a 16" pipe is actually ±3/16". See below.

2. Linear Tolerances

2.2 Linear tolerances on “A” are ± 1/8" (3.0 mm)
for sizes 10" and under, ± 3/16" (5.0 mm) for
sizes 12" through 24" and ± 1/4" (6.0 mm)
for sizes over 24" through 36".​

If you are worried about the 1/8", can you just shim it?
Also, what is your construction code? B31.3?

"Thinking is the hardest work there is, which is probably the reason why so few engage in it."

-Henry Ford

 

[jayinwww]

Thank you for all the great replies. I appreciated it. To answer your questions DGrayPPD, yes we are building to B31.3. I attached the picture racookpe1978. Cheers everyone. I will consult with the client.

 

[curtis2004]

Hi Everyone,

First question you have to ask yourself, can this be fixed?

I think, this pipe shoe is defective and should be replaced with properly fabricated one.
Recommended fabrication tolerances +/- is actually applies to some dimensions, for example, location of this pipe shoe in reference of I-beam (vertically or horizontally). Or pipe center line between two lines connected with elbows or tees. However, in this picture it is clearly bad workmanship and nothing to do with fabrication tolerance. They even couldn't weld properly flat sheet metal together.

Fabrication tolerances are given in order to anticipate what deviations can be expected, not for an excuse for bad workmanship. All we do understand that when you do welding, tolerances will be a different than when you do CNC machining. Again question comes to "If that could have been avoided or fixed easily"?

Thanks,

 

[DekDee]

The minimal gap is a minimal problem.
What should be the concern is how are you going to blast/paint under the shoe when it is already installed ?