PIPE SADDLE SUPPORT DESIGN
PIPE SADDLE SUPPORT DESIGN
(OP)
I was requested to design a replacement of an existing pipe saddle support inside a tunnel. The pipe diameter is 900mm and spacing is 7.50m. Does anyone have a guidelines/ procedure on how to design this support.Any opinions are highly appreciated.
Thanks,
Rhie
Thanks,
Rhie





RE: PIPE SADDLE SUPPORT DESIGN
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RE: PIPE SADDLE SUPPORT DESIGN
RE: PIPE SADDLE SUPPORT DESIGN
Look at your pipe + water test load and distribute it equally on the bearing surface below the saddle. Calculate bending stress on the saddle's flange as a canteliver from the edge back to the web considered as the fixed point. Make sure the bending stress in the falnge is less than 22 ksi.
Web bending
Take about 30% of the weight applied at the bearing flange and calculate bending on the web from bottom of flange to height of the web. Again limit that to 22 ksi.
RE: PIPE SADDLE SUPPORT DESIGN
RE: PIPE SADDLE SUPPORT DESIGN
RE: PIPE SADDLE SUPPORT DESIGN
BigInch,
I agree to consider weight of water and pipe. But how about the effect of the vibration since the pipe is pressurized.
I am also curious how did you arrive with 22ksi. I appreciate if you can explain it further.
RE: PIPE SADDLE SUPPORT DESIGN
RE: PIPE SADDLE SUPPORT DESIGN
Mild structural steel ASTM A36 has a 36 ksi yield stress. 22 is 60% yield, which is commonly used as a local flange bending maximum stress.
For this type of application, I wouldn't use anything other than the old Blodget's text, "Design of Welded Structures". More than adequate.
Note that some pipeline codes, B31.8, do not allow direct welding of any kind of support directly to the pipe.
RE: PIPE SADDLE SUPPORT DESIGN
RE: PIPE SADDLE SUPPORT DESIGN
RE: PIPE SADDLE SUPPORT DESIGN
You did not mention the thickness of your pipe. Even though the saddle may work structurally the pipe may fail locally. The maximum local stress usually occurs just above the tips of the saddle. Regular pipe stress analysis software do not check local stress.
RE: PIPE SADDLE SUPPORT DESIGN
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