A249 and A1016 Clarification Required 1

[CobusvanJ]

We are in the process of tendering for LP Heaters, and the client specified hardness testing of the U-tubes to be done according to A249. The tubes we want to use will be 15mm OD and 0.8mm wall thickness.

Now, in A249 it is stated in Table 4 Tensile and Hardness Requirements that it is "not applicable to tubes less than 1/8 in. [3.2mm] in outside diameter or having a wall thickness below 0.015 in. [0.4mm] or both." So therefore A249 requires hardness testing.

However it states in A1016 24.3 "For tubes with wall thickness less than 0.065 in. [1.7mm], the hardness test shall not be required." which now says hardness testing is not required.

So which specification governs? Is hardness testing required or not?

 

[EdStainless]

The product spec, in this case A249 always over rules the general spec. The general spec A1016 only tells you what may be required or what needs to be done in the absence of any other directions.

Why is someone buying LP heater tubes to A249? There is no coverage there for the bending or ubend anneal. The correct spec is A688.

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