Low pressure ductHigh pressure first duct

High pressure 2nd duct

450(500) 200 (250 0.5 0.6710(800) 560 (560) 0.6 0.81000(1000) 800(800) 0.8 1more than 1000(1000) 1000(1000) 1 1.2

more than 1000(1000) 1.2 1.2 Note - in ( ) it applied to stainless steel duct .

Sheet

thickness of

straight pipe

Sheet

thickness

fittings

Diameter

Table 3 circular duct thickness of ( spiral duct ) (Unit mm)