Minimum height for pipe supports

[waddle]

I was looking for some help.

I have not been able to find out what the minimum height
for supporting pipes on commercial rooftops. A great deal of gas lines seem to be supported by 4x4. There are some manufactures of pipe supports but they do not provide a minimum guide line.

The majority of the lines will be gas,a few will support conduit.

Any help would be appreciated.

Thank You

 

[BigInch]

There's no minimum size.

A support is designed and sized for the weight of the pipe, its span, the wind, seismic loads, expansion forces, etc. all of which can vary greatly for the same pipe diameter. Only the engineer that designed it knows. I hope he wrote it down.

**********************
"Pumping accounts for 20% of the world’s energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies)

http://virtualpipeline.spaces.live.com/

 

[pennpiper]

You should give some thought to the people who will need to maintain, repair or replace these items.

First the roof. During the life of this building the roof will need to be replaced or repaired at least every five years. If you were doing this work would you want to work under pipes and electrical conduits with only 4" of clearance?

Second the Pipes and conduits. What about replacing insulation on the pipes? What about repainting the pipes with only 4" of clearance?

Don't you think it is just as ease to make the supports 2'-0" high to start with and not have people damming you for the next forty or fifty years?

 

[btrueblood]

Tall enough so the flanges don't poke thru the roof?

 

[BigInch]

I thought roofs are usually guaranteed for 20 years minimum.

If access is from the bottom through ceiling tiles, 2 feet above might be a long stretch. That might even be higher than the electrical wires, which should usually be located above pipes (at least if there are any liquid lines), right?

**********************
"Pumping accounts for 20% of the world’s energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies)

http://virtualpipeline.spaces.live.com/

 

[pennpiper]

The question addressed "supporting pipes on commercial rooftops. "

This would imply that "Under" the roof is not what was asked.

"Commercial" much like residential come with a life span from five to thirty-five years. All of which is dependent upon where this project is located (we do not know) and what the weather conditions are balanced against the quality of the initial installation.

A lot to think about.

 

[BigInch]

OK, just that I don't think I'd put then 2ft high in any case.

**********************
"Pumping accounts for 20% of the world’s energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies)

http://virtualpipeline.spaces.live.com/