2 replies to this topic

[sn_sn]

Hi,

Is it possible to convert psi/hr pressure increase in vessel to Air Nm3/hr?

Actully at degassification membrane outlet we have installed one PSV set@190kPag.

so i was worried about PSV will leak under vacuum. so went back to vendor and vendor sent me test report of PSV.

it says..valve test started with vacuum between 13.37psi to 13.25psi. and valve had pressure increase rates of 0.053 psi/hr over the time of test.

so i want to convert this psi/hr to air Nm3/hr. because installed vacuum pump capacity is 150Nm3/hr(2 vac pump)..so if PSV leaks and pressurised the system we need higher capacity vacuum pump. PSV is 1" E orifice viton seated.

[latexman]

You can.  You need to know the volume of the space where the pressure declined in the vendors test stand.  Then, use an EOS like the ideal gas law to calculate the number of moles of air that got in.

Edited by latexman, 11 July 2014 - 03:40 PM.

[sn_sn]

Thanks...I did calculation by (p1v1/t1) n=(p2v2/t2)op..n normal condition..op means operating condition..
So ans I got 101.325×22.41/273=0.367×v2/298 so v2 is around 7.3 Nm3/hr...is it the correct method...??0.367kPa is 0.053 psi/hr pressure increase

Edited by sn_sn, 11 July 2014 - 03:32 PM.