What are the standard parameters of the gas cylinder
Time：
2022-10-20
(1) Nominal working pressure of gas cylinder
For cylinders containing permanent gas, the nominal working pressure refers to the limited filling pressure of the contained gas at the base temperature (generally 20℃). For cylinders containing liquefied gas, the nominal working pressure refers to the upper limit of the gas pressure in the cylinder when the temperature is 60℃.
According to the Regulations of Gas Cylinder Safety Supervision (Wofa [2000] No. 250 of Quality and Technical Supervision Bureau), the nominal working pressure of gas cylinders has been serialized. The nominal working pressure of cylinders containing high-pressure liquefied gas shall not be less than 8MPa. For cylinders containing toxic and highly toxic liquefied gases, the selection of nominal working pressure should be appropriately raised.
(2) Hydrostatic test pressure, design pressure and allowable pressure
The hydraulic test pressure of steel cylinders is the pressure resistance test pressure for testing the strength of cylinders. According to the regulations of Seamless Steel Cylinders (GB 5099-1994) and Welded Steel Cylinders (GB 5100-2011), the hydraulic test pressure of steel cylinders is 1.5 times of the nominal working pressure.
The design pressure of a steel cylinder is the pressure used to calculate the thickness of the cylinder. The design pressure is equal to the hydrostatic test pressure.
The allowable pressure of the cylinder is the maximum pressure that the cylinder is allowed to bear, which should not be less than the medium pressure of the medium in the cylinder at 60℃. The allowable pressure of steel cylinders shall not exceed 0.8 times of the hydrostatic test pressure.
(3) Nominal volume of gas cylinder
Nominal volume of gas cylinder refers to the classification series of gas cylinder volume specified in gas cylinder regulations and standards. The nominal volume is a nominal value like the nominal working pressure, rather than an accurate actual value. To be a safety gauge, the actual volume of the cylinder must be greater than the nominal volume, with an allowance of +5%. It can be seen that although the nominal volume is the nominal value of an appellation, it is strictly limited and cannot be called casually. For example, the nominal volume of seamless gas cylinder is 40L, its actual volume should be between 40L and 42L.
For the convenience of management, the nominal volume of gas cylinders is divided into three categories: large, medium and small volume: below 12L(including 12L) for small volume, above 12L to 100L(including 100L) for medium volume, and above 100L for large volume.
The volume of steel seamless cylinders, with 40L cylinders as the most common, but there are also as small as 0.4L to 80L.
The volume of welded steel cylinders, as dissolved acetylene cylinders, is most common with 40L cylinders, liquid ammonia and liquid chlorine cylinders with 800L and 400L cylinders. Because their media mass is exactly 1 t and 0.5t according to the filling factor of 1.25 kg/L liquid chlorine.
The volume of liquefied petroleum gas cylinders is 35.5L. At 0.42 kg/L, such cylinders can be filled with just 15kg of LPG, which is one month's consumption for an average household.
(4) Maximum service temperature and minimum service temperature of gas cylinder
The maximum service temperature of a gas cylinder refers to the highest temperature that the gas cylinder may reach after it is filled with gas. According to the regulations of Seamless Steel Cylinders (GB 5099-1994), Welded Steel Cylinders (GB 5100-2011) and Gas Cylinder Safety Supervision Regulations, 60℃ is the maximum operating temperature of gas cylinders, and -40℃ is the minimum operating temperature of gas cylinders.
(5) Color of gas cylinder
Gas Cylinder Color (GB 7144-1999) clearly defines the color of gas cylinders. For example: acetylene cylinder is white, nitrogen cylinder is black, oxygen cylinder is light blue, ammonia cylinder is light yellow, carbon dioxide cylinder is aluminum white, and so on.
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