How to choose air compressor suitable for the glass industry?

What You Need to Know Before Buying a Compressor

If you are planning to buy an air compressor, then it is obvious that you need to buy a quality compressor in order to achieve psychological expectation. There are several factors that you need to consider to help you choose the best compressor.

Below are some of the top things that you need to know before buying a compressor.

1.Horsepower

You need to determine the size of the air compressor and one of the best way to get the exact size is checking on the horsepower rating. However, some salesperson may exaggerate the ratings and it is important that you get the actual rating of the horsepower. You may consider checking on the amount of power consumed after running the compressor. Usually, a 5 HP motor will run on 24 amps on 220 voltages. If the ratings are overrated the motor could draw about 15 amp, 110 voltages. Simply find a way to ensure that the horsepower is accurately rated value.

2.Air tank size

The size of air tank may not be significant as it is only used in storing the compressed air. However, if you need to save some money, you may choose a smaller air compressor if compare with a larger tank. Also, remember this option is only possible if you use compressed air intermittently. The compressor will run in the same way, no matter bigger or smaller tank. The only difference is that the smaller tank may not be more efficient before starting and cooling compressed air period.

If you financial situation well, you may consider buying a smaller tank as it is more portable and efficient when rising up the pressure.

3. Air pressure

You also need to check the air pressure rating to ensure that you purchase a compressor which runs more efficiently. In most cases, the air pressures are rated about 90 PSI. With such a rating, the air compressor will run properly but you need to ensure the compressor has a higher shut-off pressure valve.

4. The CFM (Cubic Feet Per Minute)

If you need to purchase a high quality compressor, the key is ensure the volume of compressed air which produced by the compressor. The CFM rating is according to the size and speed of the compressor. As a efficient air tool, you may consider a 3 to 4 CFM for a 90 PSI compressor. The CFM ratings may be exaggerated like the horsepower ratings, so you should be careful to ensure the CFM ratings are correctly.

SCR focuses on the research and development, manufacturing, sales and service of industrial air compressor. SCR has 16 years experience and work with Iwata to create a new technology and quality system .China SCR screw compressor is more efficient, and energy-saving.

What is TUV?

TüV (Technischer überwachungs-Verein) means Technical Inspection Association in English.

The TüV mark is a safety certification mark customized by German TüV for component products, and is widely accepted in Germany and Europe. At the same time, companies can apply for CB certificates in combination when applying for the TüV mark, thereby obtaining certificates from other countries through conversion. Moreover, after the products have passed the certification, TüV of Germany will come forward to inquire about qualified component suppliers’ rectifier manufacturers to recommend these products; in the process of complete machine certification, all components that have obtained the TüV mark are exempt from inspection.TÜV SÜD is an international certification organization that provides professional management system certification services. TÜV SÜD has mastered professional international management system audit and certification skills, and conducts testing and certification on quality, environment, energy, safety, risk, health, education, business continuity, and social responsibility. The fields involved include automotive, railway, aviation, mechanical engineering, information technology, banking, finance and health services

TUV logo – Image Credit

The full name of TÜV is “Technische Überwachungs Vereine”, which is the abbreviation of “Technical Supervision Association” in German. It does not carry out actual business itself.

At present, five companies are authorized to operate TUV business in Germany according to the region[1], specifically TUV RH (Rhine), TUV NORD (North Germany), TUVPS (South Germany), RWTUV (Hand), TUV Saarland (Saar) [2]  . Since September 1, 2004, TUVNORD and RWTUV merged into the new TUV North Germany.

TUV Rheinland, headquartered in Germany, is an international certification body with branches in more than 30 countries around the world. Its organizational form is similar to that of the United States. It is also in charge of various government departments in accordance with commodity categories, and conducts inspection, supervision and management according to relevant laws or government approvals. The German Technical Inspection Agency Network (TUV) is officially recognized and is responsible for the quality of goods in the market. As a prestigious international certification body, the company has a history of more than 130 years in the field of product inspection and certification, forming a complete and rigorous inspection theory and method, and is committed to becoming a leader in providing safety and quality certification services. With more than 80 branches and more than 7,400 professionals in the world, we provide comprehensive safety and quality services to customers all over the world. It is the international authority to independently test product safety and quality and management system

Electrical Safety Testing

The TUV testing laboratories are equipped to carry out different tests on a wide range of electrical and electronic equipment. This enables them to cater to manufacturers of telecommunication, information technology, laboratory equipment, white and brown goods, and much more.

Testing electrical equipment is one way of ensuring that they comply with relevant standards, regulations, and directives. The testing, which may be partial or full, enables the product manufacturers to meet safety standards and customer requirements, hence preventing faulty or unsafe equipment from entering the markets.

By testing and certifying that their products meet applicable safety standards, the manufacturers show that they have confidence in their products while sending a message on their commitment to user safety. When equipment is tested before being released into the market, it saves the manufacturer from expensive product recalls as well as numerous potential litigations.

TUV provides services such as testing, inspections, training, certification, and other services that help manufacturers build and maintain consistent quality. They use the current directives and regulatory requirements to carry out their testing throughout the product lifecycle, hence allowing manufacturers to take corrective measures along the way.

Some of the areas tested include:

General Construction of the product

Equipment assembly

Mechanical, Electrical, and Fire enclosure

Physical requirements such as stability

Power supply and wiring connections

Protective earth and grounding

Label Requirements

Marking

Environmental testing

Electromagnetic interference testing

Product performance and reliability testing

These tests are carried out in their laboratory spread across several cities in the world. However, for plant equipment and other products that can only be tested in the field, TUV carries out the required tests at the customer’s site where the equipment is installed.

TUV ensures that customers who get certified products get efficient equipment that is safe and capable of serving them well. Manufacturers with certified products that meet the global standards have better chances over competitors whose products are uncertified or that do not meet the recommended safety and operational standards.

How Do Rotary Screw Air Compressors Work?

All compressors work using a mechanical element that physically reduces the volume air takes up, compressing it. In a rotary screw compressor, that mechanical component is a pair of screws. These two screws are meshed together and turn continuously. Air enters and is then compressed in the gap between the screw threads. Here’s how oil-flooded rotary screw air compressors work:

1. Air enters the compressor through the inlet valve.

2. Air then travels through the pressure control line and into the regulator valve. This process sets the air pressure for the system.

3. Both oil and air enter the compressor, where they combine into a mist. Air travels the length of the matching rotary screws and becomes compressed.

4. After exiting the compressor, the air and oil mist enters the primary oil separator tank. The tank uses centrifugal force to make the oil molecules come together, forming droplets that fall to the bottom of the tank. The oil can then be recycled into the air compressor for the next batch of air.

5. The air then enters a secondary separation filter, which further purifies the air and removes more of the oil.

6. The oil-free air then exits the system, into a reserve tank or the connected air tools or machinery.

7. The oil travels from the separator tank to an oil cooler. Next, it goes through a filter that removes any debris and is then returned to the air compressor.

SCR focuses on the research and development, manufacturing, sales and service of industrial air compressor. SCR has 16 years experience and work with Iwata to create a new technology and quality system .China SCR screw compressor is more efficient, and energy-saving.

What the difference between Oil-Free and Oil-Injected Screw Compressors?

Rotary screw compressors are commonly used in a wide range of commercial, industrial, and light manufacturing applications that range from 3hp to over 500hp. A conventional rotary screw compressor employs two intermeshing rotors in a stator housing that has an intake and a discharge port. Also referred to as helical screws, the rotors interlock precisely and spin at high speeds, in opposite directions.

One of the rotors pulls the air in through the intake port, which is equipped with an air inlet filter that prevents airborne particles to enter the compressor. Then, both rotors push the air toward the discharge port.

Because the distance between the rotors decreases gradually, from the intake port toward the discharge port, the air is captured in a “pocket” as it moves down the axial length of the screws and forced (compressed) into a smaller chamber. In a continuous process, the compressed air is discharged from the opposite end of the intake, as new air is drawn in.

Types of Rotary Screw Compressors

Rotary screw compressors are divided into two main categories: Oil-injected and oil-free.

Oil-Injected Compressors

In these compressors, oil is injected into the compression chamber to lubricate and keep all the elements within permissible operating temperature limits. Although oil is the preferred choice because of its lubricating and sealing properties, synthetic lubricants are also used, particularly in applications that involve higher temperatures.

Using oil or other lubricants as a medium of heat transfer to remove some of the waste heat resulted from the compression process will reduce the amount of vapor in the compressed air or gas. This will minimize leaks from returns into the compression chamber during the discharge. Some compressor models also include a fan on the drive motor shaft that provides airflow in order to cool the lubricant as well as the other elements of the compressor.

To remove the lubricant from the compressed air or gas, most oil-injected compressors use a centrifugal separator. However, a small amount of lubricant or oil (oil carry-over) often passes through the separator, together with the compressed air or gas. The oil or lubricant is filtered and cooled before being re-injected into the compression chamber. In applications that require compressed air or gas at lower temperatures, the air or gas can be run through an additional aftercooler.  

Oil-Free Compressors

In oil-free rotary screw compressors, the rotors do not come into contact to create friction. Thus, they do not require lubrication within the compression area. Because the compressed air or gas is completely oil-free, these compressors are suitable for applications that cannot tolerate contamination of the compressed air or gas with oil or other lubricants.

However, the bearings must be adequately lubricated. The lubricant will protect bearing surfaces against corrosion, reduce friction, inhibit wear, and ensure efficient and reliable operation.

Because oil-free compressors tend to heat up fast, compressing air or gas in just one step can raise the temperature above the limits recommended. To avoid this—as well as any potential leaks in the compression chamber during the discharge—compression is done in two stages.

Each stage compresses the air or gas gradually, by several bars; the air or gas reaches the desired pressure level at the end of the second stage. To further remove the waste heat, most designs are built with an intercooler between the two stages and an aftercooler after the second stage.

SCR focuses on the research and development, manufacturing, sales and service of industrial air compressor. SCR has 16 years experience and work with Iwata to create a new technology and quality system .China SCR screw compressor is more efficient, and energy-saving.

SCR has providing oil free screw compressor for GHH since 2008

Back to 2008, SCR already start to manufacture oil free screw compressor cooperated with Germany GHH company, and it’s the first Chinese brand to produce oil free screw compressor,  with more than 10years oil free compressor experience, SCR already provide high quality oil free screw compressor with Class 0 certificate to many customers in the Pharmacy industry.

Like SINE Pharmacy Company in the Shanghai, they are a very famous pharmacy manufacturing company, and they choose to cooperate with SCR back to 6years ago, and use SCR oil free screw compressor to keep support their factory sustainable operation, which provide the high quality class 0 oil free air for their manufacturing process.  

SCR as a manufacturer and supplier of high-quality PM compressor, oil injected screw compressor, energy saving screw compressor, Work with Iwata to create more efficient, energy-saving and environmentally friendly products.