repair / patch work / encasing of various vessels and ducts in sa plant fact cd , during ata-2020 . , repair / patch work / encasing of various vessels and ducts in sa plant fact cd , during ata-2020 . , patchwork / repair / encasing on various vessels and ducts with ms material . work involves: collection and transportation of ms plates [ 6mm / 8mm / 10mm / 12mm / 16mm thk . ] and required materials from cd-stores . necessary site arrangements including scaffolding shall be done . cut and remove the damaged portion / weak areas of the duct / vessel as per instruction , fabricate new pieces from 6 / 8 / 10 mm ms plates , fit up new pieces after proper edge preparation by grinding and full welding the joints to meet the site requirement . encase the weak portions of the ducts / vessels with additional ms plates of 6 / 8 thick and full welding as per instruction of engineer in charge . ms plate shall be formed and shaped to existing shape / profile and symmetry of the vessels / ducts . patchwork / encasing will have to be carried out at all area and elevations as required . after work completion , dismantle the scaffolding , clear the site and transport the the scrap to the scrap yard . , patch work / repair / encasing on various vessels and ducts with ss material . work involves: collection and transportation of ss plates [ 6mm / 8mm / 10mm thk . ] and required consumables from cd-stores . necessary site arrangements including scaffolding shall be done . cut and remove the damaged portion / weak areas of the ducts / vessels as per instruction , fabricate new pieces from 6 / 8 mm ss plates , fit up new pieces after proper edge preparation by grinding and full welding the joints to meet the site requirement . any weak portions of the ducts / vessels to be encased shall be done with additional ss plates of 6 / 8 mm thick and full welding as per instruction of engineer in charge . patch work / encasing will have to be carried out at all area and elevations . ss plates shall be rolled , formed and shaped to existing shape / profile and symmetry of the vessels / ducts . after work completion , dismantle the scaffolding , clear the site and transport the the scrap to the scrap yard . , encasing on various vessels and ducts with 3mm thick ss material . work involves: collection and transportation of 3 mm thick ss plates and required consumables from cd-stores . necessary site arrangements including scaffolding shall be done . encase the weak portions of the ducts / vessels with additional 3mm ss plates and full welding as per instruction of engineer in charge to meet the site conditions . the 3mm ss plate will have to properly rolled and formed to shape / profile and symmetry of the vessel being encased . all plate edges should be properly bevelled . all encased joints is required to be full welded . necessary patchwork of the area to be encased has to done with ss / ms plates as instructed by engineer in charge . encasing will have to be carried out at all elevations . after work completion clear the site and transport the the scrap to the scrap yard / area earmarked .