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thickness for insulation
- Thread starter NAFT
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Avoid lagging for personnel protection if at all possible. You will be buying a great deal of corrosion problems for no process benefit. The standard to look at for insulation is a Dutch one: CINI Manual Insulation For Industries
Steve Jones
Materials & Corrosion Engineer
Steve Jones
Materials & Corrosion Engineer
BChoate
Under insulation corrosion can become and issue when equipment is insulated for personnel protection. Typically, personnel protection considers keeping the surface temperaure below 150 F; as low as economically possible, perhaps 130 F. Insulation requirements are calculated from a heat transfer basis (conduction and radiation)based on the process temperature, the pipe thickness, the insulation type, and aluminum covering if needed. A link giving some information is
Many times, if the temperature is high enough to warrant personnel protection, there are also process benefits. If a fluid is being heated or cooled, then the heat transfer fluid (HTF) temperature, without losses to the environment, affords a lower HTF flow rate. Certainly, if cooling is substantially below atmospheric dew point, insulation and sealing prevents condensation on the equipment. Safety is an important issue. I would like to think that none of us would leave an exchanger at 400 F bare and open to contact with personnel. If under insulation corrosion is an issue, the equipment should be primed with an appropriate thickness of a suitable primer. In some of my assignments, stainless steel was primed prior to insulation.
Bill C.
Under insulation corrosion can become and issue when equipment is insulated for personnel protection. Typically, personnel protection considers keeping the surface temperaure below 150 F; as low as economically possible, perhaps 130 F. Insulation requirements are calculated from a heat transfer basis (conduction and radiation)based on the process temperature, the pipe thickness, the insulation type, and aluminum covering if needed. A link giving some information is
Many times, if the temperature is high enough to warrant personnel protection, there are also process benefits. If a fluid is being heated or cooled, then the heat transfer fluid (HTF) temperature, without losses to the environment, affords a lower HTF flow rate. Certainly, if cooling is substantially below atmospheric dew point, insulation and sealing prevents condensation on the equipment. Safety is an important issue. I would like to think that none of us would leave an exchanger at 400 F bare and open to contact with personnel. If under insulation corrosion is an issue, the equipment should be primed with an appropriate thickness of a suitable primer. In some of my assignments, stainless steel was primed prior to insulation.
Bill C.
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