PN vs. PS?

[macPT]

I all

I am used to see the nominal pressure of an hydraulic valve to be identified with PN letters. So a PN10 valve would be a valve with a nominal pressure of 10bar. Am I right?

Now, for a certain project, a supplier offered, for a PN10 specification, a PS2,5 dismantling joint.

Is he talking about the same thing? What is the nominal pressure of a PS2,5 component?

Thanks for your help

 

[gerhardl]

Beats me, but ask the supplier after which norm he supplies.........

.... but I couldn't resist: searching Google for PS2,5 , PlayStation 2 (PS2) pops up.

So, PS2,5 must be a slight improvement on this... (ouuuch! ;-) )

 

[macPT]

Gerhardl

I've asked the supplier and the answer was that a PS2,5 as a working pressure up to 10bar.

I don't know why, but I would be more confident if I knew more about this matter, not resting only on the supplier's information (not that I don´t trust the supplier!).

I've tried the internet also: PlayStation pops up and pops up and pops up.......

I don't think it's related. PlayStation and water, it just doesn't seems right!

Regards

 

[terje61]

PS = maximum allowable pressure. As a default given in barg.

I have not used this abbreviation myself, but I saw it mentioned in the European Pressure Equipement Directive (PED) tables. The PED is a European law, so I assume that they are using internationally accepted abbreviations.

I am however confused by the answer of your supplier, because PS2,5 clearly stands for 2.5 barg not 10 barg.

Regards,
Terje

 

[macPT]

Could it be that PN is referred to bar and PS to MPa?

So PS2,5 would be the same as PN25. That, I am going to ask to the supplier.

Thanks

 

[gerhardl]

terje61/macPT, your last conclusion seems sensible, as any dismantling joint would have to be supplied to a certain norm, and a pressure class within this norm.

On the other side a PS joint is normally a 'non lockable' dismantling joint made in one tubular (welded) piece, the two ends to slip over two flangeless pipe-ends of (usually) a slight different dimension, to connect them together.

This dismantling joint will not have normal end-flanges. It will however have end flanges to steer throughgoing bolts. The bolts are necessary to tighten clamping flanges (is this the correct expression in english?) on both ends which press and hold the joints profile sealings in place.

I mention this, because the holding and clamping flanges might in measurements deviate from normed flange form, and no information about norm might be read from this.

Back to basic then: only two ways to determine allowable pressure. Either have supplier to give information, or do a full material calculation and testing against norm.