As it is understood the reason for glycol is to preserve the heat. It is a usual practice to have additive inhibiters to prevent corrosive effect. So glycol with inhibitors will go well with the mix proportion of yours with LTCS material. But without inhibitors it is prone to acid formation in the long run and causing corrosion of CS and LTCS. Definitely SS would suit well without inhibitors.
The following links will provide insight on to the subject on uninhibited Glycol
http://www.thermo.com/eThermo/CMA/PDFs/Various/File_26366.pdf
http://stinet.dtic.mil/cgi-bin/GetTRDoc?AD=AD466284&Location=U2&doc=GetTRDoc.pdf
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| "Bagesh Kumar" <bagesh.kmr@gmail.com> Sent by: materials-welding@googlegroups.com 18/09/2008 09:05
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The Project is in Russia where the MDMT is -47 Deg C, I have only got confused with the presence of Glycol in the fluid, because the Glycol combination does not recommend the use of Carbon steel materials.
Kumar Bagesh
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Kannan.Sundaram@Linde-LE.com
Sent: Thursday, September 18, 2008 3:59 PM
To: materials-welding@googlegroups.com; piping_valves@yahoogroups.com
Subject: [MW:1136] Piping Materials for Hot water Tracings.
The conservative material prescription for heat tracing is carbon steel. But however you have take into account where the plant is installed, like cold countries where the winter temp. drops quit low. This is independent of the design temp. of the service. So refer the contract for the Min. metal design temp. for piping, because it does vary between equipments design and piping design.
With regards,
Kannan
| "Bagesh Kumar" <bagesh.kmr@gmail.com> Sent by: materials-welding@googlegroups.com 18/09/2008 05:37
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Dear All,
The Fluid for Industrial Heating Water is a mixture of Glycol 56 % and Water 44 %,
PMC has suggested use of Low Temperature Carbon Steel Materials,
Please Throw some light on Proper Piping Material for the said Fluid, The Design Temperature is 130 Deg C Max and Pressure is 16 Kg/Cm2.
I have used previously SS 316, For MEG Service, Services in a petrochemical plant.
Kumar Bagesh
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