Small air separation FAQ - DEAR Air Separation

Installation of small air separation unit valves

1 pay attention to the direction of the arrow on the valve and the process requirements of the media flow direction, in order to avoid installation errors. 2 The pipeline connected with the valve should be thoroughly cleared of dirt, dust and other foreign mechanical impurities before installation. Prevent damage of the sealing surface of the valve. 3 The cold valve on the cold box should be installed at the same time as the corresponding brack...

Dec 17, 2025

Pressure test and gas tightness test for small air separation unit

1Test 1.1 The water used for the pressure test shall be clean domestic water ，for containers with complex structures or distillation towers, plate fin heat exchangers, condensing evaporators, adsorbers, filters, etc., which should not be used as a medium, the air pressure test is available. 1.2 Gas tightness test for dry oil-free clean air or nitrogen. 2 test pressure categories: strength air pressure test, test water pressur...

Dec 10, 2025

How to degrease in small air separation unit

It is recommended to degrease aluminium parts (pressure vessels, valves, pipelines) with perchloroethylene or trichloroethylene solvents, and carbon tetrachloride (CC14) solvents are strictly prohibited. The solvent must be oil-free and degreased, and decomposed solutions are not allowed. Organic solutions are not suitable for assemblies with rubber, plastic or organic coatings. Organic solvents are toxic and flammable and should be used with care. In addition t...

Dec 01, 2025

Advantages of centrifugal compressors in small air separation unit

Advantages of centrifugal compressors in small air separation unit Gas compression can be divided into volumetric and speed type according to the principle, piston air compressors are commonly used volumetric compressors, while centrifugal compressors are speed type compressors. The advantages of centrifugal compressors compared to piston compressors are obvious: compact structure, small size, large displacement, small consumption of raw materials; less wearing parts than piston compressors, lo...

Nov 21, 2025

How to arrange the high-pressure steam main of the small air separation unit?

How to arrange the high-pressure steam main of the small air separation unit? Small air separation unit for turbine high-pressure steam piping materials are selected according to the pipeline level, design temperature, design pressure and special requirements of the medium and other design conditions, as well as the corrosion resistance of the material, processing performance, welding performance and economic rationality. High-pressure steam main usually laid out on the corridor of small air s...

Nov 13, 2025

Rapid development of small air separation unit import and export in China

After 1990s, the specifications of imported air separation unit increased to 20000m³/h and above, mostly from Linde and French Air Liquide, and also American Air Products. Foreign companies began to build manufacturing bases in China precisely because they were optimistic about the rapid development of China's national economy and the high market demand. After 1994, Linde and Air Liquide established large air separation plant manufacturing bases in Dalian and Hangzhou, Liaoning Province, re...

Nov 05, 2025

Impeller requirements for centrifugal compressors in small air separation unit

The impeller is the component of the centrifugal compressor that does the work on the gas, in which the temperature pressure and flow rate of the gas are increased. The impeller is a key component in determining the performance of the centrifuge. The impeller must be designed and manufactured to meet the following requirements: it must transmit more energy to the gas flowing through it; the gas flow in the impeller must have low energy losses; and the impeller's structural, thermal and flow par...

Oct 28, 2025

Air separation plant air compression piping how to arrange

Air separation plant piping is an important part of the air separation unit, and each air separation system should have a piping arrangement design. When using air compressors as pipe supports, we should pay attention to the location of the fixed pipe frame. Air compressors are equipped with air venting silencers, silencers should be located as close as possible to the compressor, the purpose of doing so is to be able to quickly empty the compressor when it is close to the critical curve of whe...

Oct 21, 2025

Small air separation unit mid-programme using PSA units as pre-treatment

Decarbonisation of large ammonia plants using the dual high pressure adsorption process can be seen as using PSA decarbonisation as a pre-treatment unit for PSA purification of hydrogen and nitrogen. The process is to first remove the conversion gas to obtain 98% (v) decarbonised gas for urea and other processes and then to enter the PSA purification small air separation unit to obtain C02 0.02% (v) hydrogen and nitrogen as the feed gas for ammonia synthesis. The choice of pretreatment ...

Oct 13, 2025

How to use intelligent management for precise energy saving in air separation equipment?

Sep 30, 2025

Causes of reduced efficiency of piston expanders in small air separation unit

The ratio of the actual expansion refrigeration capacity of the expander to the theoretical isentropic expansion refrigeration capacity is the efficiency of the expander. In small air separation unit operation, the efficiency of the expander is generally reduced for the following reasons: poor cooling, the outside world has more heat transfer, pay attention to keep the insulation material dry; inlet and exhaust valves are not closed, exhaust valve seat pressure sleeve top wire is too loose or in...

Sep 23, 2025

Selective adsorption of molecular sieves in small air separation unit

Selective adsorption of molecular sieves in small air separation unit The molecular sieve selectively adsorbs molecules according to their different properties in liquid air separation plant. According to the size of the molecules, the molecules smaller than their pore size are selected for adsorption; for molecules of similar size, according to the polarity of the molecules, the more polar molecules are selected for preferential adsorption; according to the saturation of the molecules, the lar...

Sep 12, 2025

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