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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

(OP)
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

XL83NL,
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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