Explosion Vented Equipment System Protection Guide. Robert C. ComerЧитать онлайн книгу.
reactions on panels and reinforcing members, lbs/in.Rocylinder radius, in.Saallowable stress (2/3 of the 0.2% yield strength), psiScSection modulus of reinforcing composite member, in.3Sstresses in material, psiSuultimate strength of the material, psitpthickness of the panel, in.twweld size, in.Tbolt torque, in.‐lbsTttotal load on panel, lbsTpthickness of reinforcing ring, in.vPoisson's ratioVoshear load on panel edge, lbsVmmaximum vertical shear end reaction load, total load/2, lbsVhhorizontal shear between panel and reinforcing member, = Vm Q/Ic = lbs/in.wuniform edge load acting on the reinforcing member, lbs/in. = Rmax × 2 panelsw.g.water gauge pressure, inches of water, psiWbmaximum individual bolt load, lbsWpwidth of panel or reinforcing ring, in.wt/ftweight per foot of reinforcing member, lbs/ftymaxmaximum deflection of the panel, in.Zdistance of bolt farthest from neutral axis, in.
Greek Symbols
αcoefficient from Table 2.1βcoefficient from Table 2.1∆growth of cylinder under load, in.σ x,y stress in cylinder wall, psiσmaxstress in head, psi
Note: All pressures are gage pressures unless otherwise indicated.
Typical Dust Collection System Checklist
Example (Rectangular Dust Collector)
System Identification: Typical dust collector example
Process Product: No specific product assumed
Product Pmax_____________ Product Kst________ Pred = 5.0 psi assumed
Basis of Pmax and Kst: Was product dust tested ____Y ____X __N
Were values approximated from a chart ____Y ___X ___N
Other: Average values assumed for this example
Dust collector: If square or rectangular
Pressure rating from manufacturer: ±20 in water gauge
Basis for rating: 60% of 0.2% yield strength, or other__________
Is vessel located inside or outside? Inside
Top width: 97.75 in. Depth: 38.25 in. Height: 27.75 in.
Top sheet thickness: 10 ga. (0.1345 in.)
Sides height: 108.25 in.
Sidewall thickness: 10 ga. (0.1345 in.)
Reinforcing on top or walls: None
Volume of dust collector: N/A
Dust collector: If cylindrical
Pressure rating from manufacturer:_________________
Basis for rating: ________% of 0.2% yield strength, or other_______
Diameter: _________
Type of top: Flat______ Ellipsoidal__________ Torispherical_______
Thickness of top: _______
Thickness of cylinder wall: _______
Length of cylinder: ______________
Volume of dust collector: ______________________________________
Hopper height: 30.50 in. Discharge size: 9.25 in. × 9.25 in.
Hopper wall thickness: 10 ga. (0.1345 in.)
Dust collector/hopper flange size and thickness: 2″ × 2″ × 1/4″ angle
Bolt size and spacing: _________________________________________
Volume of hopper: N/A
Number of bags/cartridges: N/A
Bag/cartridge diameter: __________ Number of bags/cartridges: ______
Bag/cartridge volume: ______________
Access door width and height: 37.875 in. × 40 in.
Access door thickness: 10 ga. (0.1345 in.)
Reinforcing on door: None
Type of latching:Clamps________________ Bolts _________________________Hinges ____________ Hinge pin diameter __________________
Nozzles: Diameter __________________________________
Dusty air inlet dimensions: _____________________________
Clean air outlet dimensions: ____________________________
Leg supports:Size: ______ Number of supports: 4 Length of supports: 78.50 in.Footpad size and thickness: 7.50 in. × 7.50 in. × 1/2 in.Attachment to floor or ground: 3/4 in bolts to floor
Explosion vent information:
Manufacturer/part number: N/A
Size: Round _______ Square/rectangular: 24 in. × 24 in.
Vent pressure rating: 1.0 psi ± 0.25 psi Vent area: ___________________
Flange size: 2″ × 2″ × 1/4″ angle Bolt size and number
Distance from top of dust collector: 35 in.
Duct information:
Size: 24 in. × 24 in. Length: Wall thickness: 10 ga. (0.1345 in)
Any bends at end of duct?
Screw conveyor:
Cover width __________ Cover length _________ Thickness _________
Spacing and size of bolts or clamps on cover:
Acknowledgments
It is a pleasure to acknowledge my appreciation to people that inspired this manuscript. I am particularly indebted to George Petino, Jr., MME, P.E., Dust Explosion Consultant and owner of Hazards Research Corporation, who provided me with the opportunity to consult with facilities worldwide in mitigating their dust explosion hazards. His professional mentoring and guidance has been extraordinary.
I am also indebted to my son‐in‐law Jack Kehlenbeck who aided in compiling the manuscript, his computer skills are outstanding.
NFPA, National Fire Protection Association, must be applauded for their work in making and keeping the Standards on Explosion Protection by Deflagration Venting viable and progressive.
I must thank John Wiley & Sons, Inc., Project Editors Ms Beryl Mesiadhas, Michael Leventhal, Summers Scholl, and Vishnu Priya for their excellent professional guidance.
Finally, as always, I could accomplish nothing without the support and encouragement of my wife Jean.
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