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NBC 2005 for pressure vessels

NBC 2005 for pressure vessels

(OP)
The NBC 2005 provides only for limit states design. The load combinations in 4.1.3 are for limit states; there doesn't seem to be a paragraph for allowable stress design.

But, per most if not all Canadian jurisdictions, pressure vessels are designed to ASME Boiler and Pressure Vessel Code, which is strictly by allowable stress design.

The longitudinal stress in the (vertical) vessel will be found based on weight, wind, seismic, etc. These loads must be combined as defined in the NBC.

But how to resolve the issue of ASD load combinations versus combinations per limit states analysis?

RE: NBC 2005 for pressure vessels

TomBarsh,

Forgive me, but how does the design of pressure vessels tie to the NBC?

VOD

RE: NBC 2005 for pressure vessels

(OP)
VOD,   

All Canadian jurisdictions require ASME Code for design of pressure vessels. ASME Code requires that all loading acting on the vessel be considered in the design; longitudinal stresses in the vessel (and corresponding required thickness) will be a function of the bending moments acting on the vessel from wind and seismic. The wind and seismic conditions are specified in the NBC.

Further, NBC defines the load combinations to be considered in the design of the structure (in this case, the pressure vessel).

For example, in Alberta, pressure vessels are registered by ABSA (Alberta Boilers Safety Association). ABSA adopts the Alberta Safety Codes Act as one of the pertinent Acts governing design of pressure vessels. The Alberta Safety Code Act in turn adopts the NBC model building code. Thus there is the jurisdictional linkage as well as the technical linkage.

RE: NBC 2005 for pressure vessels

TomBarsh,

My copy of the NBC 1990, which has since been updated, under 4.1.2.3 states that design shall be carried out in accordance with Working Stress Design OR Limit States Design.  If this has changed, then you have a problem.

HTH

VOD

RE: NBC 2005 for pressure vessels

Hi TomBarsh,

Did you resolve your problem?

VOD

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