Pipe insulation man-hours

1. For all types of HOT Equipment insulation (Glass Fiber, Mineral Wool and Calcium Silicate), the work hour units are based on the following erection method:

Shell cover (blanket or block) is applied with staggered joint arrangement. Top and bottom edges are securely tied over support rings with wire on 12-inch centers. Vertical and horizontal seams are laced together by interlocking the wire mesh and with wire ties where necessary. The insulation is secured in place with bands spaced on 12-inch centers.

Head cover is shaped so that all sections closely fit the contour of the head and are laced together with wire, or are secured with bands on 12-inch centers at tangent line. Exposed head cover is secured with bands attached to a 1⁄4” round steel rod, with a floating ring on the top and a circumferential band at the tangent line of the vessel head. Unexposed head cover is secured with wire to insulation supports provided by the vessel manufacturer.

Weatherproof jacket on vertical equipment is supported on S-clips spaced on 4-foot centers. The jacketing for vertical and horizontal equipment is secured with bands spaced on 12-inch centers with one band at each circumferential lap. On vertical equipment, band loops are included on each band to prevent vertical movement. Weatherproof jacket on exposed vessel heads is a flat metal sheet cut into “pie” pieces and secured with screws on 3-inch centers.

2. For all types of COLD Equipment insulation (Cellular Glass and Polyurethane), the work hour units are based on the following erection method:

Shell cover (block) is applied with staggered joint arrangement. Joints are buttered with joint sealer. In double layer applications, the inner layer is applied without joint sealer. Each layer is secured with bands on 12-inch centers. Outer layer joints are offset from inner layer joints. Vapor barrier is outer layer only. Joints are sealed with a foil-to-mylar 3-inch wide strip applied over the vapor barrier. Contraction joints are included as 11⁄2” wide, packed with 2” of fiberglass blanket material, on 12-foot maximum centers.

Head cover is shaped so that all sections closely fit the contour of the head. Joints are buttered with joint sealer. In double layer applications, the inner layer is applied without joint sealer. Exposed head cover is secured with bands attached to a 1⁄4” round steel rod, with a floating ring on the top and a circumferential band at the tangent line of the vessel head. Unexposed head cover is secured with wire to insulation supports provided by the vessel manufacturer.

Weatherproof jacket on vertical equipment is supported on S-clips spaced on 4-foot centers. The jacketing for vertical and horizontal equipment is secured with bands spaced on 12-inch centers with one band at each circumferential lap. Each band is equipped with one breather spring.