SECTION 033000 - CAST-IN-PLACE CONCRETE

Sludge Treatment Project Engineered Container Retrieval and Transfer System January 2012
D. Tees and Laterals: Select types and fabricate according to SMACNA's "HVAC Duct
Construction Standards - Metal and Flexible," Figure 3-4, "90 Degree Tees and Laterals," and
Figure 3-5, "Conical Tees," for static-pressure class, applicable sealing requirements, materials
involved, duct-support intervals, and other provisions in SMACNA's "HVAC Duct
Construction Standards - Metal and Flexible."
2.3 DUCTWORK FABRICATION - EXHAUST DUCTWORK
A. Fabricate process area exhaust ductwork and supports in accordance with ASME AG-1, Article
SA, Service Level C, and Table SA-C-1300, SMACNA Round Industrial Duct Construction
Standards, Class 1, and SMACNA Rectangular Industrial Duct Construction Standards, Class 1.
Pressure Classification negative 20-in water gauge, including maintenance load. Fabricate
seismic bracing in accordance with Division 23, Section “Vibration and Seismic Controls for
HVAC, Piping and Equipment”.
B. Construct bends, and elbows with minimum radius 1-1/2 times centerline duct width. Where
not possible and where rectangular elbows are used, provide single thickness turning vanes
constructed and installed in accordance with SMACNA Standards.
C. Provide, at minimum, rectangular 45 degree entry fittings for rectangular ducts and 45 degree
wye takeoffs for round ducts, unless shown otherwise on drawings.
D. Duct sizes noted are inside clear dimensions.
E. Increase duct size gradually, not exceeding 15 degree divergence wherever possible. Do not
exceed 30-degree divergence upstream of equipment. Do not exceed 45-degree convergence
downstream of equipment.
2.4 SHEET METAL MATERIALS
A. General Material Requirements: Comply with SMACNA's "HVAC Duct Construction
Standards - Metal and Flexible" for acceptable materials, material thicknesses, and duct
construction methods unless otherwise indicated. Sheet metal materials shall be free of pitting,
seam marks, roller marks, stains, discolorations, and other imperfections.
B. Galvanized Sheet Steel: (Supply, Return, and Outside Air ductwork) Comply with
ASTM A 653/A 653M.
1. Galvanized Coating Designation: G90.
2. Finishes for Surfaces Exposed to View: Mill phosphatized.
C. Stainless-Steel Sheets: (Exhaust system ductwork) Comply with ASTM A 240/A 240M or
A 480/A 480M, Type 304 or 304L, as indicated in the "Duct Schedule" Article; cold rolled,
annealed, sheet. Exposed surface finish shall be No. 2B. Submit material test reports.
D. Factory- or Shop-Applied Antimicrobial Coating:
1. Apply to the surface of sheet metal that will form the interior surface of the duct. An
untreated clear coating shall be applied to the exterior surface.
Contract 44577 KW Annex - Rev. E 44577-CSI-SPEC-001 233113 - 5