RPAd Dimensions

[marchieV]

Hi All,

I'd like to know if there is a documented code, standard, or reference that I can use as a basis for the following formula that I found on the internet for calculating the dimensions of the reinforcing pad:

𝐿1=d+10𝑚𝑚
𝐿2=2d
𝑤=(𝐿2−𝐿1)/2
𝐶1= 𝐷_ℎ sin^(−1)⁡(d/𝐷 )(𝜋/180)+10𝑚𝑚
𝐶2=𝐶1+2𝑤

See the attachment for the photo.

I tried to search for references for the above formula, but nothing clearly states where it originated.

Thank you.

Regards,

marchieV

 

[LittleInch]

Your piping code will have the formula to use for branch connections.

So B31.3 is in section 304.3.4, but your dimensions don't seem to correspond.

"formula that I found on the internet "

Really needs no other comment....

At its most basic, the repad replaces the metal "lost" by the hole of the branch, usually within 1D of the hole, hence the L2 = 2x D

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[marchieV]

Hi LittleInch,

Thanks for the response.

I'm just wondering about the basis of the formula.

 

[LittleInch]

There's alittle bit more to it than that but when you look at the formula, it basically adds the metal taken away but excludes corrosion and other tolerances.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.