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Summary of Control Valve Standards (4)
Valve Standards Summary: Part IV
This article is the fourth part of the Valve Standards Summary series, outlining the key international standards for valves used for process control.
American Petroleum Institute
The American Petroleum Institute (API) is a standards-setting body focused primari......
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Jessica
GB 11914-89 Determination of chemical oxygen demand in water quality Dichromate method
Determination of Chemical Oxygen Demand of Water by Potassium Dichromate Method
Introduction:
The Chemical Oxygen Demand (COD) of water is an important indicator that reflects the amount of organic microbes and pollutants in the water, and is widely used as an important assessment index of water......
GB/T 15262-94 Determination of sulfur dioxide in ambient air Formaldehyde absorption-pararosaniline spectrophotometric method
GB/T 15262-94 Determination of sulfur dioxide in ambient air—Methanol absorption-pararosaniline spectrophotometric method
1. Introduction
Sulfur dioxide (SO2) is a colorless, odorless gas, which is mainly from industrial and domestic combustion sources. It is one of the major causes of air poll......
GB/T10624-1995 high-purity argon technical indicators
GB/T10624-1995, Technical Index for High Purity Argon
High purity argon is a gas used in arc welding and other industrial processes. It is a colorless, odorless and inert gas that produces a protective and non-combustible atmosphere during welding, cutting, and other metal-fabrication processes. ......
GB4884.2-1995 pure helium
Hydrogen is a chemical element with the symbol H and atomic number 1. With an atomic weight of 1.008, it is the lightest element on the periodic table. Hydrogen is the most abundant chemical substance in the universe, making up 75% of normal matter by mass and almost all of the helium in the unive......
GB 15322-94 Technical requirements and test methods for combustible gas detectors
GB 15322-94 Combustible Gas Detectors Technical Requirements and Test Methods
It is most important to detect combustible gases in various industrial production processes, such as chemical and petrochemical industries, power plants, military radar and other related areas. GB 15322-94 Combustible G......
GB/T3634-1995 Industrial Hydrogen Technical Indicators
Industrial Hydrogen Technical Index GB/T3634-1995
Hydrogen is an important fuel for industrial production. Rapid development and wide application in the petrochemical, chemical and atomic energy industries have promoted the development of hydrogen technology. Hydrogen technology has become a part......
GB/T7445-1995 pure hydrogen, high-purity hydrogen and ultra-pure hydrogen
GB/T 7445-1995 Hydrogen, High Purity Hydrogen and Ultra-high Purity Hydrogen
1 Scope
This standard specifies the requirements, sampling and chemical and physical testing of hydrogen, high purity hydrogen, and ultra-high purity hydrogen.
2 Normative References
The following documents are essent......
Welding process parameters for diffusion welding of different metals (or alloys) (1)
Welding Parameter of Diffusion Welding for Different Metals or Alloys
Diffusion welding is one of the most popular and commercially used processes involved in joining two pieces of metals or alloys. The diffusion welding process involves the use of a pressure, heat, and atmosphere to make a form ......
Material Chemical Analysis
Sample Analysis of Material Chemistry
Coal gasification is the process of transforming coal from a solid or liquid form into a gaseous state. This process has been utilized, to varying degrees, since the late 1700s when it was discovered that heating coal to a high temperature would produce a com......
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