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Thanks screwmaster I missed the copper note.

Book: "Fastener Standards" Section N, Technical Data Industrial Fasteners Institute 1505 East Ohio Building Cleveland, Ohio 44114 From Fastener Standards as follows: Equation: T=KDW Where: T=torque (lb-in) K=Torque Cofficient (not to be confused with coefficent of friction) D=Nominal bolt size...

I may be wrong, but I assume this is rotating equipment of some sort? Do you have a little more description of the operating conditions, weight, shaft centers in relation to base, etc? The "L" shaped base plan was for a reason and the use of 2" and 3" size nchors also points to heavy loading...

Thanks for your responses. Please don't get me wrong, I have been a fan of RISA for quite some time (if anyone remembers when RISA2D was new software). I go back to the time of slide rules, Smoley's Tables, and Roark's Formulas for Stress and Stain. In a 2D world you would design the four...

The structure in question is a weldment of plates with stiffeners and multiple columns. In plan view it is a rectangle with the side walls having seven columns and six bays for a total of fourteen columns. The center bay has a large stack supported off the four center columns. If you hand...

I am in need of thermal properties of natural gas at varying temperatures. They have given the specific gravity of .6, but I would like some direction on where to find software or tables. Thanks for your help

Thank you Dave Atkins, I didn't ask the question, but your answer sure helped me. I was fighting a quadratic equation to arrive at "L" late last night, and I kept questioning the formulas, and by experience I knew something didn't seem right. I will request the revision from AISC in the...

I was involved in a project that we supplied the intermediate tube supports for a convection section (this has been about 5 years back). The cast intermediate tube support was exposed to high flue gas temperatures with vanadium and sulphur in the flue gas stream. The normal design criteria per...

Small skid mounted package units sold as direct-fired heaters (that are not necessarily off the shelf), but if given the fuel composition, process fluid, and flow rate lbs/hr a number of companies can supply these with burner/forced draft fan and control panel. You might look at associated...

Vibration dampening. Refer to API 560 (fired heaters for general refinery service) section 9.5 on design of self supporting stacks. Simply put, first and second critical wind velocities.

If this is an all radiant vertical heater: do you have a flat roof on the radiant? If you do have a flat roof, and are in an overfired condition, you may not be getting recirculation at the shielded walls. Therefore, the harder you try the worst it gets. If the height of the radiant tubes is...