GRP tanks under pressure : ASME vs EN 13121

[Gorostidi]

Hello

EN 13121 standard and British Standard codes offer tanks calculations based on fiberglass properties, number of layers and so on.
however, ASME X takes the GRP tanks:

a)homogeneus material and uses thickness calculation
b) laminate material but the calculations seem to be so theorical, far away from the "easy and intuituve was" of BS and EN standards.

does anyone know if this will be changed in ASME code? compared to BS and BS, ASME seems to be so not too realistic

thanks in advance
Jesus Ramon

 

[gr2vessels]

Hey Jesus,
I'm not sure about your engineering competency, but statements like 'ASME seems to be sooo not too realistic' is more suited for kitchen aids in a mexican restaurant. We, the engineers argue with facts, not feelings.
If you have something to complain about ASME, spell it out and we'll try to bring facts to your concern.
Cheers,
gr2vessels

 

[Gorostidi]

Hello

Well, i will try to explain my point of view and answer to your demand:

1) about engineer competency, well i am PhD mech engineer, and have been working in these kind of calculations about 20 years

2) about ASME seem not to bee too realistic
In ASME X there are some conditions (diameter/pressure) which are too theorical, just try to calculate a specific pressure vessel it is let's say, far away from some new standards that have come out in recent years.
On the other hand, it requires, in some cases, some destructive testing which are too expensive to carry out for small manufacturing series.

In the end, what i am just pointing out (not complaining) is that in new standards like EN-13121, some polyester parameters are taking into account in calculations (HDT, allowed elongation, type of fiberglass....) and as a result you can calculate the number of layers to use on each case very precisely.
My question is that, is that there is any idea that ASME will change to this type of calculations, like BSI have also done

regards

Jesurra