Insulation of piping
Insulation of piping
(OP)
Hello all,
I have to calculate the insulation thickness for a carbon steel (A 106 Gr.B) pipe of 4" sch.40, whose conditions are:
- temperature exterior: - 15ºC
- temperature interior (liquid inside pipe): 20ºC
How can I calculate this thickness? I am considering as insulation material, the polyethylene reinforced with fiber glass.
On the other hand, I found the ASTM-F 683 rule to calculate the insulation thickness however I don´t have this rule. Where can I get it free?
Thank you very much,
Rocio
I have to calculate the insulation thickness for a carbon steel (A 106 Gr.B) pipe of 4" sch.40, whose conditions are:
- temperature exterior: - 15ºC
- temperature interior (liquid inside pipe): 20ºC
How can I calculate this thickness? I am considering as insulation material, the polyethylene reinforced with fiber glass.
On the other hand, I found the ASTM-F 683 rule to calculate the insulation thickness however I don´t have this rule. Where can I get it free?
Thank you very much,
Rocio





RE: Insulation of piping
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Insulation of piping
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"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/
RE: Insulation of piping
RE: Insulation of piping
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INIC1000 - Cold Insulation Installation Details
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INSC1000 - Cold Service Insulation Materials and Installation Specification
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INEG1000 - Insulation Design Guide
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INEG2000 - Guidelines for Use of Insulation Practices
INGG1000 - Insulation Document Use Guideline was withdrawn November 2006. Its contents have been incorporated into INEG2000 - Guidelines for Use of Insulation Practices
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INTG1000 - Insulation Inspection Checklist
Insulation - Removable/Reusable
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INSR1000 - Installation of Flexible, Removable/Reusable Insulation Covers for Hot Insulation Service
L S THILL
RE: Insulation of piping
The insulation industry uses the 3Eplus program to calculate insulation needed for various applications. I'll bet you'll need betwee 2" and 2-1/2" of a urethane foam k=.14 to get all of these qualities. However most of us in the pre-insulated pipe industry use foams that will not meet the 25/50 smoke fire rating in a building. You can order 40' pipe for applications below ground, in non-return air spaces below a building, on a roof top or in a industrial site on racks. Just get a good jacket over the foam, like 100 mils of HDPE extruded over the spray applied 2 lb density closed cell foam. There are several manufacturers in the industry.
RE: Insulation of piping
The insulation type considered "polyethylene reinforced with fiber glass" was recommended by a supplier but maybe it is not the better solution. In that case, what kind of insulation can I use?
Thank you very much,
Rocio
RE: Insulation of piping
RE: Insulation of piping
The alternate method of injecting foam into the space between pipe and rigid jacket often leaves voids with compromised insulation and icing over the pipe.
The 3Eplus program can calculate the skin temperature to prevent icing. And sentjoh is so right, there is not enough insulation in Texas to prevent freezing in standing water after a period of time. I often describe how long before the freezing begins using a spread sheet I've set up to calculate insulation thickness in various temperature scenerios should the flow in a pipe system fail (like the ice storm knocked out the power to the pumps, how long do I have to get there and drain the system or restore circulation). Attached is an excel spread sheet I prepared for insulation analysis. One worksheet performs this freeze protection analysis.
RE: Insulation of piping