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Navid Hooshmand commented in the group on Estimate Depressuring Load When Software Is not Available: Dear Mojtaba, Thanks for good information. As you've mentioned this equation assumed constant temperature while in reality, temperature... 10 hours ago

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Estimate Depressuring Load When Software Is not Available

Mojtaba HabibiProcess Engineer at Petroleum Engineering and Development Company (PEDEC)

Dears,

As you know softwares like HYSYS, UNISIM and Pro-II are widely used for depressurization studies. But what to do if software is not available with process engineer due to any reason.

An interesting paper is recently published in Chemical Engineering journal dated on June 2013 titled "Vapor depressurization - concept and

implementation" . This paper is written by Mr.Hitesh Pandya.

At this paper below equation is presented to estimate depressuring load:

W1 = (N*M/t) * ln (P1/P2)

Where:

W1 = the initial depressuring rate, kg/min

N = the initial moles of vapor in the system

M = the molecular weight of vapor, kg/kmol

t = time, min

P1 = initial upstream pressure, bara

P2 = final upstream pressure, bara

As per author's explanation:

1. This equation provides good results for vapor-only systems.

2. For other systems a contingency of between 20–100% should be applied to the calculated rate, to allow for uncertainties (for instance, vapor molecular weight changes that may result from liquid flash).

3. Equation is valid only for systems where the flowrate from the depressurization calculations is critical

4. It also assumes that temperature, molecular weight and compressibility are constant throughout this period.

Could you please share your experiences with this equation in terms of accuracy and reliability in comparison with your cases which have been studied by software.

Also anyone that does not have this paper can send me an e-mail for a copy (My e-mail address: [email protected])

Best, Mojtaba

Estimate Depressuring Load When Software Is not Available Dears,

As you know softwares like HYSYS, UNISIM and Pro-II are widely used for depressurization studies. But what to do if software is not available with process engineer due to any reason.

An interesting paper is recently published in Chemical Engineering journal dated on June 2013 titled "Vapor depressurization - concept and implementation" . This paper is written by Mr.Hitesh Pandya.

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At this paper below equation is presented to estimate depressuring load:

W1 = (N*M/t) * ln (P1/P2)

Where:

W1 = the initial depressuring rate, kg/min

N = the initial moles of vapor in the system

M = the molecular weight of vapor, kg/kmol

t = time, min

P1 = initial upstream pressure, bara

P2 = final upstream pressure, bara

As per author's explanation:

1. This equation provides good results for vapor-only systems.

2. For other systems a contingency of between 20–100% should be applied to the calculated rate, to allow for uncertainties (for instance, vapor molecular weight changes that may result from liquid flash).

3. Equation is valid only for systems where the flowrate from the depressurization calculations is critical

4. It also assumes that temperature, molecular weight and compressibility are constant throughout this period.

Could you please share your experiences with this equation in terms of accuracy and reliability in comparison with your cases which have been studied by software.

Also anyone that does not have this paper can send me an e-mail for a copy (My e-mail address: [email protected])

Best, Mojtaba

Comments

Like Reply privately Flag as inappropriate 10 hours ago

Navid Hooshmand Process Lead Engineer at HEDCO

Dear Mojtaba,

Thanks for good information. As you've mentioned this equation assumed constant temperature while in reality, temperature may varies significantly, i.e., depressurizing air from 30 bar to 7 bar leads 50°C reduction of temperature. So, this equation is good for small pressure drop.

Regards, Hooshmand

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