Pipe Bracket Spacing

[eski1]

Hi

I need to specify the pipe bracket spacing for a 254 mm o.d x 2mm wall stainless pipe carrying mains water @ ambient temperature .
It will have 50mm wall thickness foil backed insulation on it as well .
The pipework will be undercover so not affected by the weather & supported in Phenolic blocks & at 4 bar pressure & 100 litres second max flow .

if you need to know anymore please ask , I am hoping I can use a bracket spacing of 4.5 meters

cheers

 

[MJCronin]

eski1

Your piping system is extremely thin walled.... D/t > 100 therefore it is subject to possible localized buckling.

Localized buckling/deformation must be considered in your support design for this thin walled monster

What is the piping material standard that you used ?

Was this something that was just "welded up in the shop " ????

By "bracket spacing" do you mean support spacing ?

MJCronin
Sr. Process Engineer
Venture Engineering & Construction

http://www.VentureEngr.com

 

[BigInch]

Maybe 1 meter between supports.
Or how about a real W beam running under the pipe.
Then you can support the W beam at 4.5 meter spans.



I hate Windows 8!!!!

 

[LittleInch]

From what I've seen that should be ok, but see this excellent thread for more info

http://www.eng-tips.com/viewthread.cfm?qid=49424

Normally the problem is someone stepping on it....

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

 

[eski1]

Hi
Thanks for the reply's so far

Couple of answers below .
MJCronin
The material is 316 stainless Steel Metric Tube.
This is a piperun we have to do & its about 80m which will be purge welded on-site .
Regarding the pipe brackets the pipe is 8m in the air & will be hung from the top , so I would say support spacing.

LittleInch
I did have a look at that very good thread but it was mainly for Sch Pipe that the tables related to , Not the Metric Tube we are using .
so at the moment non the wiser im afraid .

 

[LittleInch]

Read it properly. There are a significant number of formulae there with guidance on max bending stress for you to work it out for your particualr set of circumstances. It is not hard. The support supplier might even do it for you if you ask nicely.

The tube is realtively stiff, even with the increased load from the water and insualtion and if there's no snow, wind or ice load then 4.5m should be OK.

You can also search on terms such as "Thin Wall Stainless Steel span".

Your real issue is actually point loads and ensuring that your support spreads the support load enough, apart from the issue of installation and anyone putting force on it whilst they attach the insulation.

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way