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refrigeration unit
Refrigeration Systems
Refrigeration systems provide the irreplaceable ability to maintain a certain temperature within a given area. Refrigeration systems are energy consuming machines which are used throughout the world in almost every industry sector. This guide is designed to provide a general......
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Acceptance criteria for newly established medical oxygen production enterprises
Establishment Criteria of Medical Oxygen Production Enterprise
Medical oxygen is a very important life-sustaining medical gas in clinical medical treatment, and its application is becoming more and more extensive. In order to ensure the safety and effectiveness of medical oxygen, the establishmen......
GB 10871-89 Types and basic parameters of small piston single-stage refrigeration compressors
Small Piston Single-Stage Refrigeration Compressor Model and Basic Parameters
Small piston single-stage refrigeration compressor is a refrigeration compressor with relatively low power output, which is suitable for small cold storage, emulsification and refrigeration display cabinets, water chill......
GB 608-88 Chemical Reagents - General Method for Determination of Nitrogen
GB 608-88 Chemical Reagents-General Method for Nitrogen Determination
GB 608-88 Chemical Reagents-General Method for Nitrogen Determination is a standard that sets the methods and requirements for chemical reagents used in determination of nitrogen in a wide range of applications, including the d......
GB 609-88 Chemical Reagents - General Method for Determination of Total Nitrogen
GB 609-88 Chemical Reagents – General Methods for the Determination of Nitrogen Content
Chemical reagents, also known as “analytical reagents” and “analytical chemistry,” are chemical substances used to detect, measure, and analyze the composition of various materials. China’s GB 609-88 mea......
GB 8978-1996 Integrated Wastewater Discharge Standard
GB 8978-1996 Sewage Comprehensive Discharge Standards
In order to improve the water quality in the rivers, lakes and other water sources in the Peoples Republic of China (PRC), GB 8978-1996 sewage comprehensive discharge (SCD) standards came into effect on January 1, 1997. SCD standards are based......
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/T4842-1995 pure argon technical indicators
GB/T4842-1995 Pure Argon Technical Index
Abstract: This standard specifies the technical requirements, test methods, inspection rules and signs, packaging, transportation and storage requirements for pure argon in China.
1 Scope of application
This standard specifies the technical requirements,......
GWPB 4-1999 Discharge Standard of Water Pollutants for Synthetic ammonia Industry
GWPB 4-1999 Synthetic ammonia Industry Water Pollutant Discharge Standard
The General Water Pollution Prevention and Control Board (GWPB) 4-1999 Synthetic ammonia Industry Water Pollutant Discharge Standards is intended to address pollutants discharged from the synthetic ammonia industry, includi......
The principle and classification of cryopump
Low Temperature Pump Principle and Classification
Low temperature pumps are pumps which are designed to pump liquids at temperatures below the freezing point, typically -52 degrees celsius. The design of these pumps, made from stainless steel or other non-corrosive materials, is specifically tail......
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