Thermal insulation materials.
The thermal insulation system and the materials selected shall comply with the standard and specification and approved by client. All materials shall be new, free of damage and in conformity with specification .Only company approved materials shall be used for heat insulation work.
Storage of thermal insulation materials.
All the thermal insulation material shall be placed/ stored in safe custody/charge of Sub Contractor . It shall be the responsibility of the appropriate Discipline Supervisor to guarantee the flawless storage of the material for the hot insulation.
The storage of the thermal insulation material shall be stacked properly such that all the materials are easy accessible. Materials shall be protected against all adverse environments such as sun, humidity, moisture, rain, dust , sand, salt air, salt spray and sea water .
Mastics, sealants, adhesive , remain in original packing, storage according to manufacturer’s instructions ; temperature sensitive materials shall be stored in dosed roofed air conditioned containers/warehouses.
Hardware such as Screws, rivets, strap etc. Shall be stored in intact transport boxes inside a closed room.
- Temporary storage of thermal insulation materials
For temporary storage of material, it shall be covered with tarpaulin and Hard Barricade to avoid any damage.
- Removal & Disposal of Insulation Materials
Thermal insulation materials (including ancillary materials) after usage shall be removed/ disposed and shall comply with applicable national and local regulations for health, Safety and environment.
Tools & equipments.
- Shearing machine
- Grooving machine
- Lock forming machine
- Bending machine
- Rolling machine
- Drilling machine
- Hand tools
Surface preparation of thermal insulation surface.
All the area prior to start of insulation shall be officially released to insulation sub contractor, this is ensuring that all mechanical works, painting and testing has been completed and is released for insulation activity. Assure that the tank surface to be insulated shall be clean, free from moisture, oil, grease dirt and moisture.
A removable section of insulation or windows shall be provided where required for the purpose of metal wall thickness measurements.
- All installation and construction work will be undertaken in accordance with Project Site Safety Plan.
- Work permit (if needed) will be obtained prior to any work being carried out.
- Work will commence in accordance with specific measures itemized on the permit.
- All necessary personal protective equipment will be provided and worn in accordance with the site safety plan.
- Storage and handling of materials will be carried out in accordance with the applicable manufacturer’s recommendations.
- The Site of all work activities will be kept in clean and tidy manner.
Assure that the tank is already painted, tested, clean, free from moisture, oil,grease and any foreign matter prior release for insulation. Also, ensure required support ring shall be welded prior to start insulation.
- Mineral wool slabs with 40mm thick, 128 kg/m3 density shall be used as a basic insulation material as per requirements.
- The Mineral wool slabs shall be installed in single layer over the tank shell snugly fitted with all joints firmly butted and circumferential joints staggered .
- The mineral wool slabs shall be secured with SS 304 bands of size 0.6mm x 20mm at 300 mm centres
- The tank roof also shall be insulated with Mineral wool slabs of thickness 40mm in single layer. The slabs shall be secured with SS 304 band of size 0.6mm x 20mm.
- 0.8mm thick, 30-mm pitch corrugated aluminium sheet, with internal factory Polykraft-type moisture barrier consisting of a one mill thick heat laminated polyethylene film protected by a layer of 40-pound virgin Kraft paper bonded moisture barrier shall be used for the cladding of tank shell. Lap at longitudinal seam shall be two corrugations; lap at circumferential seam shall be 75 mm.
- The sheets shall be supported at the circumferential lap by S-CIips spaced at two per sheet to allow for vertical expansion .
- The jacket shall be secured by 0.6mm x 25 mm stainless steel bands, and bands shall be spaced on maximum 450mm centres . The band shall be provided with expansion spring to allow for circumferential expansion
- The cladding sheets vertical seems shall be edged & held in position by means of SS 304 self-tapping screws, 12mm x No.10 size at 150mm centres . All screws on corrugated sheets shall be located at the crown of the corrugation.
- Segmental jacketing fabricated from 1.2mm . aluminium flat sheets shall be applied on roof with overlaps. These segmental jacketing shall be secured by means of SS 304 self-tapping screws, 12mm x No. 10 size at approx. 150mm centres .
- Any penetrations of the metal jacket by pipe supports, nipple, etc, shall be weather proofed by metal flashing . Any voids between the jacket and weatherproofed bevelled shall be fitted with flashing compound Foster 95-55 to prevent the ingress of moisture.
Repair or reworks shall be noted and carried in accordance with the manufacture approved procedure