wear pad for piping support

[DavideCh]

I didn't find any ref about the calculation (or specification) of wear pad thickness

ASME 31.3 gives a calculation method/criteria for reiforcing pad only (for pipe branches) and speaks about "wear pads" (named as "saddles") only in para 328.5.4g when say

"(g) Reinforcing pads and saddles shall have a good
fit with the parts to which they are attached. A vent
hole shall be provided at the side (not at the crotch) of
any pad or saddle to reveal leakage in the weld between
branch and run and to allow venting during welding
and heat treatment. A pad or saddle may be made in
more than one piece if joints between pieces have
strength equivalent to pad or saddle parent metal, and
if each piece has a vent hole."

Considering that wear pad for piping support (usally pipe shoe) is installed to prevent corrosion (not always, but in the most of cases) i think the pad thickness shouldn't be less than reinforcing pad.

For example, if i have to install a wear pad on 6" pipe thk=30 mm (more than XXS sch), shoud i install a wear pad with thk=30mm?

Anyone know anything about this matter?

 

[1503-44]

It is not there for internal pressure, just abrasion and corrosion resistance. 6mm is usually sufficient.

“What I told you was true ... from a certain point of view.” - Obi-Wan Kenobi, "Return of the Jedi"

 

[LittleInch]

I agree. Saddles and wear pads are not the same thing.

Wear pads are commonly 6mm / 1/4".



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

 

[DavideCh]

Thanks a lot for your answers.
But i would like to know if there are any ref in ASME code or other international standard codes.
I'm not able to find anything about it.

 

[LittleInch]

None I am aware of.

Clamp on pipe shoes are fairly common now as well as this stuff

https://stoprust.com/i-rod-pipe-supports/

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

 

[XL83NL]

All I could find in the European 'equivalent' of B31.3, EN 13480, is clause 13.1.5.3. No mention on pad thickness:

13.1.5.3 Where a support component is connected to a pipe via an intermediate element or pad, the
material of that pad shall be compatible with the pipe and welding to the pipe shall conform to the pipe
welding requirements. The welding of the support to the pad shall conform to Clause 11 and 13.11.1.

Huub
- You never get what you expect, you only get what you inspect.

 

[KevinNZ]

Depends on the bearing load and level on vibration. If both are high the contact point can wear a lot. If the wearing forms a notch then there will be high loads when the line cools down and is dragged out of the notch.