Hydraulic Accumulator

As I recall, if D > 10t, it's thin-wall. You could try the thin-wall formula first, giving a preliminary ratio, and then go to thick-wall if needed.

Thanks, but I have already carried out using both. I want to know by which approach the commercially available accumulators are designed.

Well, was D > 10t, D < 10t, or (unlikely) D = 10t?

Or maybe phone up Parker or somebody, and just ask? (No guarantee they'll say....)

Using design stress 100 MPa (fairly conservative due to nature of application), r/t = 100MPa/20MPa = 5, so D/t =10, bang on the crossover point! I'd be inclined to calc it both ways and use the thicker.

Also it will see pressure cycles doing its job, so I'd think a cyclic stress/fatigue calc is required. Depending on frequency/design life, this could make a big difference.

Cheers..........Codey

Thanks Codemaster, thats a big help!

Cheers!

Accumulators come with manufacturer pressure test certs (ie, tested to 6000 psi, and therefore rated for operation to 4000 psi) (1.5 x operating pressure)

no calcs necessary. you select based on the operating pressure of your system.

Chris