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SA 240 304 higher vs lower allowabl

SA 240 304 higher vs lower allowabl

SA 240 304 higher vs lower allowabl

Dear Team,

For one of the reactor (design temp 450°C), Catalyst support beam are required to be designed with Material of construction of SA240 TP 304.
ASME II D Gives the two row of allowable. One based on 66% yield and another higher but less than (90%) yield.
For designing of such beam under continuous loading which allowable should be used for optimum and safe design.

Thanks in advance.

RE: SA 240 304 higher vs lower allowabl

In making your decision, consider that the yield stress that ASME BPVC uses is the 0.2% proof.
According to table Y-2 of ASME III Part D:
with loading to 90% of yield the material will plastically strain 0.1%.
with loading to 69% of yield the material will plastically strain 0.02%.

RE: SA 240 304 higher vs lower allowabl

@DriveMeNuts; some yield is totally acceptable (and safe) in certain applications. The code recognizes this, amongst others through note G5. As mentioned G5 is key here. Only the designer/OP can determine whats considered safe and optimum for his application.

RE: SA 240 304 higher vs lower allowabl

The purpose of G5 is for ASME to be competitive with the European code, where the 1.0% proof stress is the basis of calculating the allowable stress.

Yielding happens in every application, even with low loading. Table Y-2 provides the Engineer with a way of finding the level of yielding to determining acceptable levels for a specific application.

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