KRSA2 Two Stage Low-Pressure

Unrivaled Category Champion

Kaishan 5 bar Low Pressure Screw Air Compressors are specially designed for Textile, Cement, Glass, Flue-gas Desulfurization and Pneumatic dense phase Conveying application. When a 7-bar standard air compressor is run for a plant air pressure requirement of 2 – 5 bar, it will lead to higher power consumption as compared to Kaishan Low pressure compressors. Kaishan low pressure screw air compressors with their patented low compression ratio can deliver same outflow (cfm) with 20 – 50 % lower power consumption.

For Example: The Capacity of a screw air compressor with 132 kW motor at 7 bar will be 850 cfm. Kaishan Low pressure compressor with132 kw motor at 5 bar will have a flow of 1250 cfm. This power saving enables you to recover your investment in less than a year.

KRSA2 Two-stage air compressor features

Unmatched Specific Power with Low Compression Ratio
Low Oil Carry Over with Oversized Separator Tank
Specially Redesigned For Low Pressure
Air intake filters
Control tubing
Digital control panels
Direct drive
Direct flow inlet valve
Guarded components
Shrouded electrical hardware
Single pass oil and aftercoolers
High Efficiency 5:6 Screw Profile
Premium Energy Efficient motors.
316 stainless steel control tubing.
Note: These models can be offered with Permanent Magnet Motors.

Artificial Demand

An Pneumatic Equipment that is specified to use 2 bar,uses

70% more air at 4bar,
230% more air at 6 bar,
300% more air at 8bar.

Virtually all air-powered equipment works this way – the more pressure delivered, the greater the air used and higher the Power Consumed. This Phenomena is called as Artificial Demand.

KAISHAN TWO STAGE SCREW COMPRESSOR

Two-stage compressors have a power advantage over equivalent size single-stage compressors of 20 % percent for two key reasons: Inter Cooling System and division of Compression Ratio Kaishan Two-stage compressors use two sets of rotors arranged in a unique parallel design that achieve higher efficiencies than other two-stage rotor arrangements. The KRSA2 series compressors offer unmatched full-load efficiency and often provide two-year paybacks in energy savings compared with a single-stage compressor. With the Variable Frequency Drive control, further operating efficiencies can be achieved during part-load operation.

Compression is divided between the two stages : In a single stage compressor operating at 72 psig at sea level, the compression ratio is 5 to 1 (in absolute terms). A two-stage compressor operating at the same pressure will have a compression ratio of 2.23 to 1 in First stage (2.23 is the square root of 5) achieving the compressor’s power savings.

Internal leakage losses are reduced : Reduced pressure difference across each stage facilitates reduction in leakage loss.

Extended bearing life : By dividing the compression ratio across two stages, the two stages will significantly exceed the life of the average single-stage compressor. Bearing loads reduced to 1/3 of single stage

Use Multi-stage Compressors

Compressing in multiple stages allows cooling to occur between the stages, which saves work in the compression process. Inter-coolers are provided between successive stages of a multi-stage compressor to remove the heat of compression hence reduces the work of compression (power requirements).

P-V Graph For Single Stage Compressor

P-V Graph For Two Stage Compressor With Intercooling

High pressure efficiency

Designed for the most demanding applications, Kaishan two-stage actually gain efficiency, compared to single-stage compressors, as pressure increases. For instance, an increase of one psi in full load pressure will increase power consumption by 0.42 percent in the two-stage compressor, while the Single-stage compressor will increase 0.5 percent. This represents a 16 percent advantage for the two-stage design as line pressure increases.

At Kaishan, we know that technological advancements march on, so we invest aggressively in the future. We continually work to make our products safer and more efficient while adhering to the OSHA standards.