What effect does heat have on deflection of valve blade
What effect does heat have on deflection of valve blade
(OP)
We are manufacturing a valve from a rectangular stainless steel plate 1700 mm x 2150 mm. The deflection of the 20 mm thick plate at normal temp. is 1,9 mm. if the air flow temp is 900 deg C what iffect will this have on the deflection. Is there a way of calculating this effect.





RE: What effect does heat have on deflection of valve blade
What type of SS are you using?
Barry1961
RE: What effect does heat have on deflection of valve blade
RE: What effect does heat have on deflection of valve blade
http://w
Barry1961
RE: What effect does heat have on deflection of valve blade
310 is a well accepted and time tested material for operating temperatures of 900-950C. There is no scaling or creep failure. Ofcourse continuous exposure at this high temperature makes it brittle. Furnace parts, cement kilns,which have a continuous and long campaign use 310 parts.
RE: What effect does heat have on deflection of valve blade
Barry1961
RE: What effect does heat have on deflection of valve blade
RE: What effect does heat have on deflection of valve blade
Density lbm/in3 g/cm3
at 68°F (20°C) 0.29
8.03
Coefficient of Thermal Expansion (min/in)•°F (mm/m)•°K
at 68 - 212°F
(20 - 100°C) 8.8 15.9
at 68 - 932°F
(20 - 500°C) 9.5 17.1
at 68 - 1832°F
(20 - 1000°C) 10.5 18.9
Electrical Resistivity mW•in mW•cm
at 68°F (20°C) 30.7 78.0
at 1200°F (648°C) -- --
Thermal Conductivity Btu/hr•ft•°F W/m•K
at 68 - 212°F
(20 - 100°C) 8.0 13.8
at 68 - 932°F
(20 - 500°C) 10.8 18.7
Specific Heat Btu/lbm•°F J/kg•K
at 32 - 212°F
(0 - 100°C) 0.12 502
Magnetic Permeability (annealed)1
at 200H 1.02
Modulus of Elasticity (annealed)2 psi GPa
in tension (E) 29 x 106
200
in shear (G) 11.2 x 106 77
RE: What effect does heat have on deflection of valve blade
I have assumed simply supported edges. These are the results
Plate size = 2,15 x 1700 x 16 (5/8") thick
Working pressure = 50 mm WG = 0,0710476 lb/sq. inch
Deflection = .01246" = 0,3 mm
Max stress = 307 lb/sq. inch
Creep/Expansion in 2,15 meter directio = 35 mm
used 2,15 M x(900-20)x 18,9 is this result possible
RE: What effect does heat have on deflection of valve blade
Your result is correct concerning the expansion.
For the out of plane deflection under pressure, suppose you used the Young's modulus provided by that link, that is valid at ambient temperature. Also suppose that when the valve is shut off, the temperature of the plate won't be that of the fluid, as there is no flow. However in this case there is a temperature difference across the plate, with possibly a much higher bow (deflection).
prex
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