Common use of Lagging Materials and Installation Clause in Contracts

Lagging Materials and Installation. All insulated surfaces of equipment, ductwork, piping, and valves will be lagged. All aluminum lagging will be ASTM B 209 Alclad 3004 or acceptable equal. Aluminum lagging will be mill finished. Ribbed or fluted aluminum lagging for equipment and ductwork will be 0.040-inch minimum thickness. Flat aluminum lagging will be 0.050-inch minimum thickness, except in areas where personnel may walk thereon. In these areas, 0.080-inch minimum thickness will be used, unless steel walkways are provided. -------------------------------------------------------------------------------- Proprietary Information Page 36 AES IRONWOOD CONTRACT FINAL ISSUE - OCTOBER 30, 1998 -------------------------------------------------------------------------------- 2x1 501G REFERENCE PLANT APPLICATION HANDBOOK -------------------------------------------------------------------------------- MECHANICAL ENGINEERING DESIGN CRITERIA -------------------------------------------------------------------------------- Piping lagging will be mill finish sheet aluminum, 0.020-inch minimum thickness on applications up to 13-inch outside diameter, and 0.024-inch minimum thickness on all other applications. Outdoor lagging will be installed to secure a weatherproof installation. Lagging will be carefully fabricated and fitted to ensure a neat appearance. Open ends of all fluted sections will be provided with tight-fitting closure pieces. All areas of contact between dissimilar metals will be protected against galvanic corrosion by a suitable insulating coating. All lagging on curved surfaces will be machine rolled and formed to fit the insulation curvatures. All joints will be lapped a minimum of 2 inches and placed to shed water. Removable insulated covers will be provided over all equipment manholes, nameplates, and code stampings. Access doors through lagging will be provided, as required. All lagging will be secured in place, using panhead self-tapping screws, fitted with neoprene washers. Screws will be 6061-T6 aluminum alloy, stainless steel, or anodized 2024 aluminum alloy. spacing of screws for joints in ribbed aluminum lagging will be not more than 12 inches. spacing of screws for flat aluminum sheet will be not more than 8 inches. All joints will be placed to shed water. On outdoor piping, in addition to screws, lagging will be secured by machine-attached stainless steel bands spaced on not greater than 24-inch centers. All insulated piping will have a vapor barrier and will be aluminum lagged. All joints will be weatherproof. The vapor barrier will be attached to the inside surfaces of the lagging or will be cemented to the insulation before application of the lagging. Elbows less than 13-inch insulated OD will be covered with preformed aluminum elbows. Piping elbows larger than 13-inch insulated OD will be covered, using mitered segment aluminum elbow jackets constructed with rolled, interlocking edge joints. Mitered segments will not exceed 15 degrees included angle. Long-radius bends will be covered with spiral-wrapped aluminum strips or mitered segment gores. Top horizontal surfaces of designated ducts and designated areas on equipment will generally be provided with a system of walkways to prevent damage to the lagging during operation and maintenance. Walkways generally will be constructed of grating and will be supported directly from the duct or equipment with specially designed support lugs on not greater than 24-inch centers. Support lugs will be attached to the ducts or equipment prior to placement of insulation and lagging. Grating will be attached to the support lugs with flathead countersunk screws. Insulation Supports for Piping Vertical runs of piping which will be insulated will utilize support lugs and collars to prevent slippage of the insulation. -------------------------------------------------------------------------------- Proprietary Information Page 37 AES IRONWOOD CONTRACT FINAL ISSUE - OCTOBER 30, 1998 -------------------------------------------------------------------------------- 2x1 501G REFERENCE PLANT APPLICATION HANDBOOK -------------------------------------------------------------------------------- MECHANICAL ENGINEERING DESIGN CRITERIA -------------------------------------------------------------------------------- Insulation Classes for Piping and Equipment Piping and equipment insulation classes and corresponding thicknesses are shown in Table 2. The insulation classes for piping systems will be designated by letters, which will be indicated in the pipeline listing. The insulation for piping accessories will be of the same class as is indicated for the piping. Insulation materials for miscellaneous piping and equipment will be suitable for the actual operating temperatures and will, whenever possible, be of the same insulation class as insulated main piping and equipment operating under similar temperatures. Freeze Protection All aboveground water and steam piping will be arranged to allow drainage to protect the piping from freezing, if required. The piping systems will be arranged to minimize the amount of piping requiring drainage for freeze protection. Freeze proofing by heat tracings will be used, as discussed in Freeze Protection, of this manual. Antisweat Insulation All aboveground cold water and air piping will be provided with antisweat insulation, as indicated in Table 2, with the exception of piping in which fluid flow is not normally expected.

Lagging Materials and Installation. All insulated surfaces of equipment, ductwork, piping, and valves will shall be laggedlagged except for antisweat insulation. All aluminum lagging will shall be ASTM B 209 Alclad 3004 or acceptable equal. Aluminum lagging will be mill finishedstucco pattern embossed. Ribbed or fluted aluminum lagging for equipment and ductwork will shall be 0.040-inch minimum thickness. Flat aluminum lagging will shall be 0.050-inch minimum thickness, except in areas where personnel may walk thereon. In these areas, 0.080-inch minimum thickness will shall be used, unless steel walkways are provided. -------------------------------------------------------------------------------- Proprietary Information EPC - Exhibit B TENASKA GEORGIA GENERATION PROJECT --------------- Page 36 AES IRONWOOD CONTRACT FINAL ISSUE - OCTOBER 30, 1998 79 of 132 -------------------------------------------------------------------------------- 2x1 501G REFERENCE PLANT APPLICATION HANDBOOK -------------------------------------------------------------------------------- MECHANICAL ENGINEERING DESIGN CRITERIA -------------------------------------------------------------------------------- Piping lagging will shall be mill stucco embossed finish sheet aluminum, 0.020-inch minimum thickness on applications up to 13-inch outside diameter, and 0.024-inch minimum thickness on all other applications. Outdoor lagging will shall be installed to secure a weatherproof installation. Lagging will shall be carefully fabricated and fitted to ensure a neat appearance. Open ends of all fluted sections will shall be provided with tight-tight fitting closure pieces. All areas of contact between dissimilar metals will shall be protected against galvanic corrosion by a suitable insulating coating. All lagging on curved surfaces will shall be machine rolled and formed to fit the insulation curvatures. All joints will shall be lapped a minimum of 2 inches and placed to shed water. Removable insulated covers will shall be provided over all equipment manholes, nameplates, and code stampings. Access doors through lagging will be provided, provided as required. All lagging will shall be secured in place, place using panhead self-tapping screws, fitted with neoprene washers. Screws will be 6061-T6 aluminum alloy, stainless steel, or anodized 2024 aluminum alloy. spacing of screws for joints in ribbed aluminum lagging will be not more than 12 inches. spacing of screws for flat aluminum sheet will be not more than 8 inches. All joints will shall be placed to shed water. On outdoor piping, in addition to screws, lagging will be secured by machine-machine attached stainless steel bands spaced on not greater than 24-inch centers. All insulated piping will have a vapor barrier and will be aluminum lagged. All joints will be weatherproof. The vapor barrier will be attached to the inside surfaces of the lagging or will be cemented to the insulation before application of the lagging. Elbows less than 13-inch insulated OD will be covered with preformed aluminum elbows. Piping elbows larger than 13-inch insulated OD will be covered, using mitered segment aluminum elbow jackets constructed with rolled, interlocking edge joints. Mitered segments will not exceed 15 degrees included angle. Long-radius bends will be covered with spiral-wrapped aluminum strips or mitered segment gores. Top horizontal surfaces of designated ducts and designated areas on equipment will shall generally be provided with a system of walkways to prevent damage to the lagging during operation and maintenance. Walkways generally will shall be constructed of grating and will shall be supported directly from the duct or equipment with specially designed support lugs on not greater than 24-inch centers. Support lugs will shall be attached to the ducts or equipment prior to placement of insulation and lagging. Grating will shall be attached to the support lugs with flathead countersunk screws. Insulation Supports for Piping Vertical runs of piping which will be insulated will utilize support lugs and collars to prevent slippage of the insulation. -------------------------------------------------------------------------------- Proprietary Information Page 37 AES IRONWOOD CONTRACT FINAL ISSUE - OCTOBER 30, 1998 -------------------------------------------------------------------------------- 2x1 501G REFERENCE PLANT APPLICATION HANDBOOK -------------------------------------------------------------------------------- MECHANICAL ENGINEERING DESIGN CRITERIA -------------------------------------------------------------------------------- Insulation Classes for Piping and Equipment Piping and equipment insulation classes and corresponding thicknesses are shown in Table 2. The insulation classes for piping systems will be designated by letters, which will be indicated in the pipeline listing. The insulation for piping accessories will be of the same class as is indicated for the piping. Insulation materials for miscellaneous piping and equipment will be suitable for the actual operating temperatures and will, whenever possible, be of the same insulation class as insulated main piping and equipment operating under similar temperatures. Freeze Protection All aboveground water and steam piping will be arranged to allow drainage to protect the piping from freezing, if required. The piping systems will be arranged to minimize the amount of piping requiring drainage for freeze protection. Freeze proofing by heat tracings will be used, as discussed in Freeze Protection, of this manual. Antisweat Insulation All aboveground cold water and air piping will be provided with antisweat insulation, as indicated in Table 2, with the exception of piping in which fluid flow is not normally expected.