Piping Insulation: Important Considerations
An insulation system serves three principal purposes:
the significant reduction in heat transfer of thermal energy to and from the surface of the piping system (Heat Conservation).
the prevention of moisture formation and collection on the surface of the piping system due to condensation (Cold Insulation).
the prevention of potentially injurious personnel contact with the surface of the exposed piping system (Personal Protection).
sometimes Steam traced/Electric traced insulation, Regeneration insulation, jacketting etc are used as per process / liscensor requirement.
Fire proofing, fire protection and acoustic insulation (to absorb vibration) is provided based on project specification/ ITB requirement.
Insulation Material:
Low temperature insulation is frequently made of expanded cellular plastic or foam rubber material.
Moderate temperature insulations are made from grass fibre products.
High temperature insulation is made of preformed cementations or refractory materials or blankets made from ceramic fibres.
Insulation and accessory materials has to be 100% asbestos free.
Normally mineral fibre, cellular glass, ceramic fibre, glass fibre, polyisocyanurate, polyurethane foam etc are used as insulation material.
Few important points related to insulation (May vary from project to project):
Hot insulation or Heat conservation insulation is used when normal operating temperature exceeds 65 degree centigrade unless heat loss is desirable. (Control process temperature)
Personnel protection is used in accessible areas if temperature exceeds 65 degree centigrade.
Steam traced, electric traced, jacketting etc are used for process temperature control.
Insulation thickness is determined based on pipe size, normal operating temperature, temperature controlling requirement (extent of heat loss/gain) etc. At a minimum 25 mm thickness is used.
If insulation thickness is more than 75 mm then insulation is provided in two or more layers (multi layer).
Insulation shall not be applied untill hydrostatic/ pneumatic testing.
Insulation upto 12 inch NPS pipe shall be held with ss 304 tie wire and for >12 inch NPS ss 304 bands are used.
All flanges will be insulated other than hydrogen service or high health hazard material services.
All valves other than control valves and relief valves shall be insulated.
the significant reduction in heat transfer of thermal energy to and from the surface of the piping system (Heat Conservation).
the prevention of moisture formation and collection on the surface of the piping system due to condensation (Cold Insulation).
the prevention of potentially injurious personnel contact with the surface of the exposed piping system (Personal Protection).
sometimes Steam traced/Electric traced insulation, Regeneration insulation, jacketting etc are used as per process / liscensor requirement.
Fire proofing, fire protection and acoustic insulation (to absorb vibration) is provided based on project specification/ ITB requirement.
Insulation Material:
Low temperature insulation is frequently made of expanded cellular plastic or foam rubber material.
Moderate temperature insulations are made from grass fibre products.
High temperature insulation is made of preformed cementations or refractory materials or blankets made from ceramic fibres.
Insulation and accessory materials has to be 100% asbestos free.
Normally mineral fibre, cellular glass, ceramic fibre, glass fibre, polyisocyanurate, polyurethane foam etc are used as insulation material.
Few important points related to insulation (May vary from project to project):
Hot insulation or Heat conservation insulation is used when normal operating temperature exceeds 65 degree centigrade unless heat loss is desirable. (Control process temperature)
Personnel protection is used in accessible areas if temperature exceeds 65 degree centigrade.
Steam traced, electric traced, jacketting etc are used for process temperature control.
Insulation thickness is determined based on pipe size, normal operating temperature, temperature controlling requirement (extent of heat loss/gain) etc. At a minimum 25 mm thickness is used.
If insulation thickness is more than 75 mm then insulation is provided in two or more layers (multi layer).
Insulation shall not be applied untill hydrostatic/ pneumatic testing.
Insulation upto 12 inch NPS pipe shall be held with ss 304 tie wire and for >12 inch NPS ss 304 bands are used.
All flanges will be insulated other than hydrogen service or high health hazard material services.
All valves other than control valves and relief valves shall be insulated.
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