Contamination Technology Corporation , CTC manufactures a full line of round bubble – tight dampers.
We also specialize in designing and manufacturing custom filtration systems to meet your needs. CTC has been manufacturing Gas Phase Adsorbers and Bag in / Bag out Housings since 1994.
CCD style round bubble – tight dampers
The CCD style damper shall be a positive seal, isolation type damper which shall be bubble tight at a differential pressure of 10” water gage. Damper shall be constructed with a 10 Ga. T-304 stainless steel body and 3/16” thick flanges. The blade shall consist of two 3/16” thick disks with a replaceable neoprene or silicone gasket between them. The shaft shall be sealed with two replaceable polypak gland seals. The damper interior shall be continuously seam welded. All welds shall be chemically cleaned to remove heat discoloration.
The dampers shall be manufactured under a quality assurance program that meets all the requirements of ASME NQA-1. All welds and welders shall be qualified in accordance with ASME Boiler and Pressure Vessel Code Section IX.
The damper blade and shaft seals shall be tested at 10” water gage and tested in accordance with ASME N509-1996 class I. The complete pressure boundary shall be leak tested by the “Pressure Decay Method” in accordance with ASME N510-1995 “reaffirmed”, “Testing of Nuclear Air Treatment Systems”, Paragraphs 6 and 7. There shall be a maximum leak rate of 0.0005 CFM per cubic foot of housing volume at 10 inches water gage.
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Contamination Technologies Corporation