Because the air separation plant is always involved in pressure vessel issue， so the pressure vessel is also one part of air separation plant.
The first article : in order to make sure the safe operation of the pressure vessel and protect the safety of people’s lives and property and to promote the development of national economy, this code is formulated according to the relevant provisions of the Interim Regulations on safety supervision of boilers and pressure vessels.
The second article: The applicable scope of this procedure is as follows;
This procedure is applicable to pressure vessels with the following conditions
Maximum working pressure (Pw) (note 1) greater than 0.1MPA (no hydrostatic pressure, same below)
Inner diameter (non-circular section refers to its maximum size) is greater than or equal to 0.15m, and volume (V) (note 2) is greater than or equal to 0.25m3;
(The medium is a gaseous liquefied gas or the highest operating temperature is above equal to the standard boiling point liquid.
Chapters III, fourth and fifth of this code apply to the following pressure vessels.
A separate cylinder in a storage tank Boiler room with a non independent volume of a mobile compressor, less than or equal to 0.15m3.
High pressure vessel with volume less than 0.25m3
The cold box of the pressure vessel and the air separation equipment in the pressure vessel, the direct-fired absorption refrigeration unit of the cryogenic unit;
Spiral Plate Heat exchanger
Gas or air pressure water supply (foam) pressure tank for hydraulic automatic air pressure water supply (no tower Sheung Shui) device, air pressure tank in fire extinguishing device.
Pressure vessels for ion exchange or filtration in water treatment equipment, expansion tanks for hot water boilers.
All-closed combined electrical apparatus (capacitor pressure vessel) dedicated to power industry.
Tire vulcanizing machine and pressure rubber mould used in rubber industry.
This procedure is applicable to safety accessories such as safety valve, bursting piece device, emergency shut-off device, safety interlock device, pressure gauge, liquid level meter and temperature meter used in the pressure vessel.
The pressure vessel applicable in this procedure shall include, in addition to the body,
Welded groove of the first circumferential weld to which the pressure vessel is welded with an external pipe or device, the first threaded joint of the threaded connection, the first flange sealing surface of the flange connection, the first sealing surface of a special connecting piece or a pipe fitting.
Pressure vessel openings part of the bearing gland and its fastener
Welded joints of non-pressurized components connected to pressure vessel body.
3rd article This procedure does not apply to the following pressure vessel
Ultra High Pressure vessel
All kinds of gas cylinders.
Pressure vessels made of non-metallic materials.
Nuclear pressure vessels, ships and railway locomotives, ancillary pressure vessels, pressure vessels and pressure vessels working under vacuum (excluding jacket pressure vessels), and various boilers safety technical supervision procedures applicable to the fire-heated equipment (such as flue-type waste heat boilers, etc.) within the scope of application for defense or military equipment.
Normal operation maximum working pressure is less than 0. 1MPA pressure vessel (including in the process of feeding or material to be subjected to instantaneous pressure greater than until 0. 1MPA pressure vessel, excluding disinfection, cooling and other processes in the need for a short time to withstand pressure greater than or equal to 0. 1MPA pressure Vessel).
Carbon dioxide is used widely, it is only inferior to Oxygen.
1.It used to make carbonated drinks.
2.Fire extinguishing agent: the extinction of electrical equipment, precision instruments, valuable production equipment and book documents in initial period
3.Argon protect welding: it used in variety materials’ welding.
4.Synthetic organic chemistry: can make many kinds of commonly used chemical products (such as urea, salicylic acid, etc.)
5.Refrigerant: frozen foods
6.Generate electricity: carbon dioxide as the medium which proceed to generate electricity through low temperature heat source.
7.As a solvent, proceed to super-critical fluid extraction, as an advanced technology,used for the separate a variety products and to replace the traditional process operation.
8.Other: solid carbon dioxide (dry ice) on health care for frozen skin disease, and can be used for artificial rainfall.Using liquid carbon dioxide dry cleaning, can replace toxic dry cleaner.High purity carbon dioxide used in the electronics industry, medical research and clinical diagnosis, detection instrument calibration gas and other special gas mixture preparation, etc.
- Metal welding, cutting and a variety ofcombustion-supporting gas for combustion systemand some oxidizing gas technical process gas, etc.
- Metallurgical industry, including steel, non-ferrous metal smelting process, all have extensive use of oxygen, it is obviouslystrengthening smelting processand increase energy efficiency.
- Machinery industry: metal welding, cutting can greatly improve the working efficiency
- Chemical industry: manufacturing pharmaceutical, dyestuff, explosives and other chemical products, in addition to strengthen the production (such as the production of yellow phosphorus by oxygen blowing method, spray oxygen carrier coal, etc.)
- Electronic industry: except for combustion-supporting gas or gas oxide semiconductor integrated circuit,oxygenis one of the indispensable high purity gases in the line.Additionally, it is the important raw material of gas optical fiber
- It is used widely in national defense : the largest amount is rocket.
- Other applications: oxygen as oxidant available for MHD power generation oxygen plant ;Use oxygen to purify sewage, using oxygen in mining for deep well operations;Using oxygen to deep sea fishing, diving;Use oxygen rescue choking patient, dyingpatient;Using oxygen for health care (such as highland mountaineers, geological workers, border patrol soldiers and other special groups’ using and general staff stay in oxygen bar, etc.)
In the small water gas production of ammonia plant, the proportion of nitrogen to hydrogen ratio is table after adding the nitrogen, which smooths the operation and reduce the consumption of synthetic ammonia; In addition, it also use the refined nitrogen (99.99%) to protect the catalyst; With pure liquid nitrogen washing refined Hydrogen and nitrogen mixture, so that the inert gas (methane and hydrogen) is extremely small, the contact of carbon monoxide and oxygen are no more than 20PPm. The consumption of nitrogen wash and nitrogen are about 750m3/t ammonia. Oxygen is functioned as the evaporator of pulverized coal or heavy oil, nitrogen involved in the synthesis and function as raw materials for gas, and be the safety gas of device (catalyst coal protection will use 99.99% pure nitrogen).
In the chemical plant, nitrogen is mainly for the protection of gas, ventilation and washing gas, to ensure safe production. Such as polypropylene production, it need to use pure nitrogen (99.99%) functioning as the protection of gas, replacement gas. High purity nitrogen is a vital source of chemical fiber production. Such as Liaoyang Petrochemical Plant has three sets of 3000 m 3 / hour high purity nitrogen device;Synthetic leather factory also use high purity nitrogen to do protection, such as Yantai synthetic leather factory has a 1000m3/hour high purity nitrogen device.
Forest chemical plants also use nitrogen, as a sensitive adhesive coating, rosin, resin and other production process of protective gas. It can be said that the chemical plant has a big demand for nitrogen, nitrogen is a chemical plant “security gas”. opening up chemical nitrogen is promising. Nitrogen is also an important raw material for synthetic fiber (acrylic, nylon) and synthetic rubber .
On 15th June, 2015, the liquid oxygen plant KDO-200Y designed and manufactured by our company had successful trial run in Shangri-La, Tibet. This is the first oxygen plant in Tibet area, which can supply gas oxygen for Shangri-La city residents centralized.