Douglass

Weldable Tank Sight Glasses ZW30

Weldable tank sight glasses allow for a total view of the inside of a process. Depending on the fluid temperature and pressure to work with, a recommendation can be made on the best material of manufacture, types of crystals and types of gaskets.

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Weldable tank sight glasses allow for a total view of the inside of a process. Depending on the fluid temperature and pressure to work with, a recommendation can be made on the best material of manufacture, types of crystals and types of gaskets.


Body Manufacturing Materials Carbon steel with anticorrosive coating, stainless steel (304 or 316)
Manufacturing Materials Buna, Neoprene, Teflon, Rubber
Seals Sanitary, EPDM, Viton
Glass Manufacturing Material Borosilicate, Fluorsilicate, Quartz, Tempered glass, Polycarbonate
Type of Connection Free passage
Types of internal vision Free passage
Working pressure From 0 to 300 PSI
Working temperature -45°C – 1450°C
ID Visible Diameter A Total Diameter B Total Thickness C
3” 3” (76.20 mm) 5” (127.00 mm) 1.5” (38.1 mm)
4” 4” (101.6 mm) 6” (152.40 mm) 1.5” (38.1 mm)
5” 5” (127.00 mm) 7.5” (190.50 mm) 2” (50.8mm)
6” 6” (152.40 mm) 9” (228.60 mm) 2” (50.8mm)
7” 7” (177.80 mm) 10” (254.00 mm) 2.5” (63.5 mm)
8” 8” (203.20 mm) 11” ( 279.40 mm) 2.5” (63.5 mm)
9” 9” (228.60 mm) 12” (304.80 mm) 3” (76.2 mm)
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