Common use of Metal Clause in Contracts

Metal. seated or Teflon seal ring-seated butterfly valves for special service applications will be of the wafer or lug-wafer type and will be designed for installation between ANSI flanges. The use of these valves will be in accordance with the pressure temperature ratings specified by the manufacturer. Bronze Body Valves Bronze gate and globe valves 2 inches and smaller will have union bonnet joints and screwed ends. Bronze gate and globe valves used in control air service will have braze joint ends. Gate valves will be inside screw, rising stem type with solid wedge disks. Globe valves will have renewable seats and disks. Bronze check valves 2 inches and smaller will be Y-pattern, swing disk type or guided piston type designed for satisfactory operation on both horizontal piping and vertical piping with upward flow. -------------------------------------------------------------------------------- Proprietary Information Page 32 AES IRONWOOD CONTRACT FINAL ISSUE - OCTOBER 30, 1998 -------------------------------------------------------------------------------- 2x1 501G REFERENCE PLANT APPLICATION HANDBOOK -------------------------------------------------------------------------------- MECHANICAL ENGINEERING DESIGN CRITERIA -------------------------------------------------------------------------------- Bronze valves 2-1/2 inches and larger will have bolted flange bonnet joints and flanged ends. Gate and globe valves will be of the outside screw rising stem construction. Gate valves will have either integral or renewable seats. Globe valves will have renewable seats. The use of these valves will be in accordance with the pressure temperature ratings specified by the manufacturer and in accordance with the criteria established in MSS SP-80. Bronze valves will generally be Class 200 and will be limited to service with piping systems having design pressures of 200 psi or less, and design temperatures of 150F or less. Bronze valves will generally be limited to a size of 3 inches or less. Plug Valves Plug valves will be of the eccentric, lubricated, or Teflon sleeve plug type, as required by the service. Plug valve bodies will conform to the requirements of ANSI for dimensions, material thicknesses, and material specifications. Bonnets will be of the bolted flange type. Body ends will be flanged, faced, and drilled for installation between ANSI flanges. The use of these valves will be in accordance with the pressure temperature ratings specified by the manufacturer.