Dear Seniors,
1. How many cubic meters of gas are present in the N2 cylinder?
2. Is it mentioned anywhere on the cylinder?
3. How can we check the exact cubic meters of gas present in the cylinder at the time of receiving the cylinder?
4. How do we calculate the exact cubic meters of gas present in the cylinder by using conversion factors and weighing the cylinder before and after use (Unit: Kgs)?
Regards,
Abhay
From India, Thana
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211. How many cubic meters of gas are present in the N2 cylinder?
2. Is it mentioned anywhere on the cylinder?
3. How can we check the exact cubic meters of gas present in the cylinder at the time of receiving the cylinder?
4. How do we calculate the exact cubic meters of gas present in the cylinder by using conversion factors and weighing the cylinder before and after use (Unit: Kgs)?
Regards,
Abhay
From India, Thana
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Please refer to Gas Law.
Volume of Compressed Gas in a Cylinder
To find the volume of gas available from a compressed gas cylinder, we apply the Ideal Gas Law (PV = nRT). In a high-pressure cylinder, the volume will be affected by the content's compressibility factor Z (PV = ZnRT). For example, an AL cylinder of pure helium may contain 134 cu. ft. of gas, while the same cylinder of pure air may contain 144 cu. ft. under the same conditions. For these practical calculations, however, we assume ideal gas behavior for simplicity.
The Ideal Gas Law PV = nRT
Where:
- P is pressure
- V is volume
- n is the number of moles
- R is the gas constant
- T is the absolute temperature
When the temperature is kept constant, we can derive the equation:
(P₁ × V₁ = P₂ × V₂)
Where:
- (P₁) is the pressure of the compressed gas in the cylinder (psi)
- (V₁) is the internal volume of the cylinder, often referred to as water volume (liter)*
- (P₂) is the atmospheric pressure (1 atm - 14.7 psi)
- (V₂) is the volume of gas at pressure (P₂) (liter)
For example, an AL-sized cylinder is filled with nitrogen at 2000 psi. What is the gas volume of nitrogen from the cylinder?
- (P₁) is 2000 psi
- (V₁) is the internal volume of AL cylinder 29.5 liter*
- (P₂) is 14.7 psi
- (V₂) is the unknown volume of gas
Solving the equation above for (V₂) gives:
(V₂ = (P₁ × V₁) / P₂ = (2000 psi × 29.5 liters) / 14.7 psi = 4013 liters, approximately 140 cu. ft.)
Alternatively, you may please ask your supplier how the measurements are done. Try to locate if this falls under any IS code and read the Receiving Inspection Methods.
Please revert back in case you do not get satisfactory answers. By then, I shall ask the Design Engineers.
Thanks & Regards,
Sudhir
From India, Vadodara
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Volume of Compressed Gas in a Cylinder
To find the volume of gas available from a compressed gas cylinder, we apply the Ideal Gas Law (PV = nRT). In a high-pressure cylinder, the volume will be affected by the content's compressibility factor Z (PV = ZnRT). For example, an AL cylinder of pure helium may contain 134 cu. ft. of gas, while the same cylinder of pure air may contain 144 cu. ft. under the same conditions. For these practical calculations, however, we assume ideal gas behavior for simplicity.
The Ideal Gas Law PV = nRT
Where:
- P is pressure
- V is volume
- n is the number of moles
- R is the gas constant
- T is the absolute temperature
When the temperature is kept constant, we can derive the equation:
(P₁ × V₁ = P₂ × V₂)
Where:
- (P₁) is the pressure of the compressed gas in the cylinder (psi)
- (V₁) is the internal volume of the cylinder, often referred to as water volume (liter)*
- (P₂) is the atmospheric pressure (1 atm - 14.7 psi)
- (V₂) is the volume of gas at pressure (P₂) (liter)
For example, an AL-sized cylinder is filled with nitrogen at 2000 psi. What is the gas volume of nitrogen from the cylinder?
- (P₁) is 2000 psi
- (V₁) is the internal volume of AL cylinder 29.5 liter*
- (P₂) is 14.7 psi
- (V₂) is the unknown volume of gas
Solving the equation above for (V₂) gives:
(V₂ = (P₁ × V₁) / P₂ = (2000 psi × 29.5 liters) / 14.7 psi = 4013 liters, approximately 140 cu. ft.)
Alternatively, you may please ask your supplier how the measurements are done. Try to locate if this falls under any IS code and read the Receiving Inspection Methods.
Please revert back in case you do not get satisfactory answers. By then, I shall ask the Design Engineers.
Thanks & Regards,
Sudhir
From India, Vadodara
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Dear Sudhir, Thank you for the technical explanation. However, I regret to inform you that I have not received accurate answers to my query. If you don't mind, kindly ask your design engineers. I am eagerly awaiting your kind reply.
Thank you & Regards,
Abhay
From India, Thana
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Thank you & Regards,
Abhay
From India, Thana
Acknowledge(0)Amend(0)
I tried to clear your queries as per your questions. Please go through the same. I hope this may clear your queries.
1. How much cubic meter gas is present in the N2 cylinder?
- Approximate volume of the N2 Cylinder is 50 Litres.
- Pressure in the N2 Cylinder is about 150 Kg/Cm².
- If you apply the Ideal Gas Law P1V1 = P2V2 ➡ 150x50 = 1xV2 ➡ V2 = 7500 Litres.
2. Is it mentioned anywhere on the cylinder?
- Tare weight and net weights are available on the cylinder.
- The water volume of a standard cylinder is about 50 Litres.
- Pressure in a full gas cylinder is about 150 Kg/Cm². We may check the same by using regulators.
3. How to check the exact cubic meter of gas present in the cylinder at the time of receiving the cylinder?
- We know the approximate volume and then verify the pressure and apply the Ideal Gas Law as given above.
4. How to calculate (Conversion factors) the exact cubic meter of gas present in the cylinder by taking before use and after-use weighing of the cylinder (Unit: Kgs.)
- After some gas usage from the full cylinder, check the pressure remaining in the cylinder.
- Assume the gas remaining is 90 Kg/Cm². As per the Ideal Gas Law, the volume of gas available in the cylinder is 4500 Litres.
- If you want to know the weight of the gas, multiply the volume with the density (N2 gas density is 0.967g/cm³).
- Weight = Volume x Gas density = 4500x0.967 = 4351.5 gms = 4.35 Kg.
Regards,
From India, Hyderabad
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1. How much cubic meter gas is present in the N2 cylinder?
- Approximate volume of the N2 Cylinder is 50 Litres.
- Pressure in the N2 Cylinder is about 150 Kg/Cm².
- If you apply the Ideal Gas Law P1V1 = P2V2 ➡ 150x50 = 1xV2 ➡ V2 = 7500 Litres.
2. Is it mentioned anywhere on the cylinder?
- Tare weight and net weights are available on the cylinder.
- The water volume of a standard cylinder is about 50 Litres.
- Pressure in a full gas cylinder is about 150 Kg/Cm². We may check the same by using regulators.
3. How to check the exact cubic meter of gas present in the cylinder at the time of receiving the cylinder?
- We know the approximate volume and then verify the pressure and apply the Ideal Gas Law as given above.
4. How to calculate (Conversion factors) the exact cubic meter of gas present in the cylinder by taking before use and after-use weighing of the cylinder (Unit: Kgs.)
- After some gas usage from the full cylinder, check the pressure remaining in the cylinder.
- Assume the gas remaining is 90 Kg/Cm². As per the Ideal Gas Law, the volume of gas available in the cylinder is 4500 Litres.
- If you want to know the weight of the gas, multiply the volume with the density (N2 gas density is 0.967g/cm³).
- Weight = Volume x Gas density = 4500x0.967 = 4351.5 gms = 4.35 Kg.
Regards,
From India, Hyderabad
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