1. Member

Join Date
Oct 2009
Posts
56

## Depressurization with hysys

Dear all

I have to simulate a depressurization of a plant gas working at 69 barg (Pdesign=74 barg) with Hysys.
I know that I have to do 2 different simulations:
1- with Fire: to define the orifice
2- with adiabatic: to define the minimum temperature of metal.

Problems:
- I have to use the model "Fire" and I dont know the parameters required by Hysys Q=C1+C2*time-C3*(C4-Vessel Temp)+C5*liqVol (time=t)/liqvol (time=0)
- I have to use the Fisher model for valve and I dont know wich flow and with % opening I have to set.
- The vessel has an internal thermal insulation, I have to consider the weight of metal in contact with the gas?

Anyone can help me?????????

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3. Senior Member

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For depressurization, set time =15 min and let HYSYS find the Cv
For firecase , you can use the 50 btu/lb latent heat/ or the calculated latent heat to find the required orifice. you may use this orifice in dep utility and fine tune the orifice size by running multiple runs of the utility.
For adiabatic, i assume you are running a depressurization case and the approach more or less is similar to setting the time and finding Cv. API 521 sets the guidelines for final pressure and time.
See help from your senior engineers in your organization as dep/relief system design is a serious field.

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5. Junior Member

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Dear gents,

I just want to ask you a question about depressurization. A depressurization take place only in Dynamic model or also State model? Could I simulate a depressurization in State model?

Thank.

6. Member

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Posts
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Barbara@:
The following conditions were considered to estimate Lowest vessel Inner wall temperature :
• As a conservative approach the Metal mass is not considered.
• In the Heat Flux Model “Adiabatic” condition is chosen.
• In the Heat Loss Model “Detailed” calculation is chosen.
• Ambient Temperature considered is 25oC
• Metal Thickness considered is 10 mm.
• Insulation Thickness considered is NIL
• Heat Transfer Coefficient – “Continually Update Heat Transfer Coefficient” is considered to allow HYSYS to determine the coefficient dynamically.
• PV Work Tem entered is 90 %.
• Used CV in blowdown calculation (fire API521 model)
• Calculate Area/Pressure (chose "Pressure")

7. Junior Member

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## Re: Depressurization with hysys

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8. Junior Member

Join Date
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Posts
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## Re: Depressurization with hysys

Depressurization is now become easy with hysys for tutorials join

[link Point to another website Only the registered members can access] contact omesoleducation@gmail.com for free training material.

Professional Development Courses Available For Engineering & Management Professional / Students.

-::Available Courses::-

- Process Simulation & Modeling Aspen Hysys Basic
- Process Simulation & Modeling Aspen Hysys Advance
- Simulation 3 in One Package(Aspen Flare, HTFS, Pipesys)
- Process Equipment Design Engineering
- Process Design Engineering
- P&ID and PFD Development
- Energy Audit & Conservation
- Total Productive Management
- Total Productive Maintenance
- Risk Assessment
- Supply Chain Management
- Virtualization For Beginners
- Installing & Managing Windows Server 2012
- Introduction To Active Directory Domain Services
- Awareness, Implementation & Internal Auditing to IMS (ISO 9001, ISO 14001 & OHSAS 18001)
- MS Project
- Primavera P6
- Routing & Switching
- Certification In Information Technology
- Project Management
- Communication & Presentation Skills
- Chemical Engineering For Non–Engineers

Comprehensive courses to meet your training needs by leaders in their fields.
For More Details Visit:

[link Point to another website Only the registered members can access]

9. Junior Member

Join Date
May 2014
Location
Italy
Posts
7

## Re: Depressurization with hysys

Originally Posted by omesol
Depressurization is now become easy with hysys for tutorials join

[link Point to another website Only the registered members can access] contact omesoleducation@gmail.com for free training material.