Page 168 - Industrial Process Plant Construction Estimating and Man Hour Analysis

144 Industrial process plant construction estimating and man-hour analysis

8.4 General scope of field work required for each coal-fired
boiler sheet 3

Scope of Work-Field Erection
Pressure Parts
Install and Weld Attemperators, Superheater, and Reheat Components
Final Secondary Superheater
Tubes—connecting
Tubes—sections
Headers
00
00
Weld tubes to header stubs—(3-1/2 < BW 4 TIG) (2001–2600) psi
Fit and weld filler bar at tube welds
First and Second Stage Attemperators
Spray type—complete with body and internals (excludes welding)
Drum type—complete with internals, piping, valves, and supports (excludes
welding)
00
Connecting tubes (4-1/2 welded to stub above and 4 expand in drum, weld
00
to header)
00
4 OD, expand tubes in drums (2000 psi)
00
Weld Tubes to header stubs—(4 < BW 4-1/2 TIG) (2001–2600) psi
00
Intermediate Secondary Superheater-Pendant/Inverted Loop
Headers
Supports—rods
Tube sections
Tube section supports
Saturated connections
Mountings Seals
Seals
00
Weld tubes to header stubs—(3-1/2 < BW 4 TIG) (2001–2600) psi
00