Insulating Material for Heat Conservation Insulation

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Heat conservation insulation is required for pipes at high fluid temperature so that heat loss from pipe is minimum and no process disturbances occur.

For equipment and piping which is to be operated intermittently or continuously at temperatures not exceeding 100°C,  the insulation may be rigid urethane foam.

For equipment operated intermittently or continuously above 100°C or for acoustic insulation applications, the insulation may be calcium silicate. Calcium silicate insulation which contain asbestos filler shall not be acceptable.

For equipment and piping which is to be operated intermittently or continuously at temperatures up to 260°C, primary insulation may be foam glass complying with ASTM C552 and with density of at least 88kg/m3 and a temperature rating of 315°C.

For equipment and piping which is to be operated intermittently or continuously at temperatures up to 500°C, the insulation may be mineral wool with temperature rating of 500°C. All mineral wool shall be water repellent and tested for water absorption and retention. Mineral wool blankets for piping and vessels greater than 36″ shall conform to ASTM C592. They shall have density of at least 128 kg/m3 and shall be faced with wire mesh inside and either wire mesh, expanded metal, or glass mat outside.

Mineral wool preformed sections shall be used for piping larger than 1-1/2″ and up to and including 36″. They shall conform to ASTM C547, have density of at least 160 kg/m3 and shall be faced with wire mesh inside and wire mesh or glass mat on the outside. Mineral wool blocks and boards shall conform to ASTM C612. Their minimum nominal density shall be 160 kg/m3.

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