Robert C. Comer - Explosion Vented Equipment System Protection Guide

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.

Example (Rectangular Dust Collector)

System Identification: Typical dust collector example

Process Product: No specific product assumed

Product P max_____________Product K st________ P red= 5.0 psi assumed

Basis of P maxand K st: Was product dust tested ____Y ____X __N

Were values approximated from a chart ____Y ___X ___N

Other: Average values assumed for this example

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

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

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.

Size: 24 in. × 24 in. Length: Wall thickness: 10 ga. (0.1345 in)

Any bends at end of duct?

Cover width __________ Cover length _________ Thickness _________

Spacing and size of bolts or clamps on cover:

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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