Refrigeration system: The refrigeration system is one of the key parts of the constant temperature and humidity test chamber http://. It can also be called the internal organs of the constant temperature and humidity test chamber. Generally speaking, the cooling mode of the constant temperature and humidity test chamber is mechanical refrigeration and auxiliary liquid nitrogen refrigeration, mechanical refrigeration adopts vapor compression refrigeration, and the refrigeration system (mechanical refrigeration) of Huatian constant temperature and humidity chamber is mainly compressed by two French Taikang. Multi-stage refrigeration consisting of a unit, Taiwan Zhongli condenser, Taiwan Zhongli evaporator, American Sporlan refrigeration solenoid valve, and throttle mechanism. Work principle of the constant temperature and humidity test chamber cascade refrigeration system: two French Taikang compressors, one is auxiliary refrigeration; one is main refrigeration.

First, the auxiliary refrigeration compressor is described. The compressed gas directly enters the condenser to reach the normal temperature state, and then is dried and filtered and then divided into two (A, B) respectively controlled by two American Sporlan refrigeration solenoid valves. A further divides two capillaries (C, D), C enters the evaporator to the constant temperature and humidity test chamber http://laboratory cooling, D cools the reflux pipeline. B cooling heat exchanger in order to create better cooling conditions for the main refrigeration compressor, thus achieving a power-saving, high-efficiency cooling effect. Finally, the check valve is controlled to recover the compressor.

The main compressor is a driven fluid that raises the low pressure gas to a high pressure. It sucks low-temperature and low-pressure refrigerant gas from the suction pipe, drives the piston to compress it by running the motor, and then discharges high-temperature and high-pressure refrigerant gas to the exhaust pipe to provide power for the refrigeration cycle, thereby achieving compression→condensation→expansion→ Evaporation (endothermic) refrigeration cycle. Huadian Instrument's constant temperature and humidity test chambers use the US "DUPONT" ​​environmentally friendly refrigerant R404A, R23; its ozone loss coefficient ODP is 0.

DUPLEX STAINLESS STEEL

Duplex Stainless Steels Available

Yuhong Group supplies LDX2101, 2205, Ferralium 255, Zeron 100 and LDX2507 in the form of plate, sheet, strip, bar, pipe, tubing, pipe fittings, flanges and weld wire.

Duplex Stainless Steel Overview

Duplex Stainless Steels, also referred to as austenitic-ferritic stainless steels, are a family of grades with about equal proportions of ferrite and austenite. These steels have a duplex microstructure which contributes to their high strength and high resistance to stress corrosion cracking. Due to their high content of chromium, nitrogen and molybdenum, duplex steels offer good resistance to local and uniform corrosion. Duplex stainless steels have good weldability.

Today, modern duplex stainless steels can be divided into three groups:
Lean Duplex such as LDX2101
Standard Duplex such as 2205, the work-horse grade accounting for more than 80% of duplex usage
Super Duplex such as Ferralium 255 and Zeron 100 and LDX2507

Of the duplex grades, duplex 2205 is the most widely used. However, the super duplex steels like Zeron® 100 and LDX2507 are excellent for servicing severe corrosive environments, such as offshore and marine applications. Lean duplex 2101 is available as an economic alternative to 300 series stainless steels.

What are the Characteristics of Duplex Stainless Steels ?
Very good resistance to uniform corrosion
Very good resistance to pitting and crevice corrosion
High resistance to stress corrosion cracking and corrosion fatigue
High mechanical strength
Good sulfide stress corrosion resistance
Good abrasion and erosion resistance
Good fatigue resistance high energy absorption
Low thermal expansion
Good weldability

In what Applications are Duplex Stainless Steels® used ?
Oil and gas equipment
Offshore technology
Seawater desalination plants
Chemical industry, especially when handling chlorides
Flue-gas cleaning
Desalination plants and seawater systems
Pulp and paper industry
Cargo tanks and pipe systems in chemical tankers
Firewalls and blast walls on offshore platforms
Bridges
Storage tanks
Pressure vessels, reactor tanks, and heat exchangers
Rotors, impellers and shafts

Duplex Boiler Tube

Duplex Boiler Tube,Duplex Seamless Boiler Tube,Duplex Steel Boiler Tube

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