Pressure Safety Valves Calculator - Fire Case Gas Filled Vessel

In summary, this conversation is about finding help with questions related to calculating the required pressure relief valve size for a gas filled pressure vessel on fire. The standards mentioned are ISO 4126, EN 764-7, AD Merkblatt, and PED 97/23/EC, which cover above half bar pressure. The suggested method is to follow API RP 521 and API 520 for determining the heat input and relief valve size, respectively.
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  • #2
This worksheet determines the required pressure relief valve orifice area for a gas filled pressure vessel that is on fire.

These calculations are usually based on API 520. I would verify the calculator before you use it for any real relief valve sizing.
 
  • #3
Thanks for your reply

Im looking at an anaerobic digester with an operating pressure of between 20 and 30mbar. Usually relief valves will be set to release at around 35mbar.

Standards I've found are

ISO 4126 (harmonized with European Union directives) [5]
EN 764-7 (former CEN standard, harmonized with European Union directives, replaced with EN ISO 4126-1)
AD Merkblatt (German)
PED 97/23/EC (Pressure Equipment Directive - European Union)

Most only cover above half bar do you or does anyone know if there are any other regs to consider?

If not is there a simple calculation for sizing relief valves?

ZEN
 
  • #4
From your standards it looks like this is a European installation.

Assuming this, the PED will apply. You will need to get your relief valve CE Marked and the CE Declaration of Conformity should list the highest applicable PED category.

I would suggest following API RP 521 to determine the heat input from fire and API 520 to calculate the relief valve size. You should be able to download or order these standards - they will have all the equations.
 
Last edited:
  • #5


Hello Zen,

I am happy to assist you with understanding this calculator. The Pressure Safety Valves Calculator for Fire Case Gas Filled Vessel is a tool used in the design and sizing of pressure safety valves for vessels that contain gas under fire conditions. This calculator takes into account various parameters such as the vessel size, pressure, temperature, and gas properties to determine the required size and type of pressure safety valve needed to protect the vessel from overpressure during a fire event.

The calculator uses well-established engineering principles and equations to provide accurate results. It is important to note that this calculator is meant to be used as a guide and should not be solely relied upon for critical design decisions. It is always recommended to consult with a qualified engineer or safety specialist for a thorough analysis and design of pressure safety valves in any industrial application.

I hope this helps in understanding the purpose and functioning of this calculator. Let me know if you have any further questions. Best of luck with your project!

Sincerely,
 

1. What is the purpose of a pressure safety valve in a fire case gas-filled vessel?

The purpose of a pressure safety valve in a fire case gas-filled vessel is to protect the vessel from overpressure in the event of a fire. It automatically releases excess pressure to prevent the vessel from rupturing or exploding, ensuring the safety of the surrounding environment and personnel.

2. How does the calculator determine the required size of a pressure safety valve?

The calculator uses a combination of the vessel's size and operating conditions, such as temperature and pressure, to determine the required size of the pressure safety valve. It also takes into account the type of gas being used and any applicable safety standards or regulations.

3. Can the calculator be used for all types of gas-filled vessels?

No, the calculator is specifically designed for fire case gas-filled vessels. It may not be suitable for vessels with different operating conditions or purposes, such as pressure vessels for chemical processing.

4. Is the calculator accurate and reliable?

Yes, the calculator is based on industry standard equations and calculations, making it accurate and reliable for determining the required size of a pressure safety valve. However, it is always recommended to have a professional engineer review and approve the calculations for safety and compliance purposes.

5. Can the calculator be used for existing vessels or only for new designs?

The calculator can be used for both new and existing vessels. For existing vessels, it is important to input the correct operating conditions and dimensions to accurately determine the required size of the pressure safety valve.

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