Month: June 2017

FS-Curtis Assists Those in the Fabricated Metals Industry

Compressed Air is an integral part of the Fabricated Metals Industry. Premier Tool Grinding manufacturer of carbide cutting tools uses our NxB22 along with our RNE Dryer and CF Filtration system. See how we assist companies like Premier Tool in the Fabricated Metals Industry.
Many processes and applications continue to use inefficient devices to deliver the compressed air, and many companies fail to recognize the simple implementation and significant payoff of improving compressed air efficiency.

Improving compressed air efficiency, or saving more of your compressed air capacity by minimizing compressed air demand, can be realized by following some simple procedures. Though there are many actions that can be taken to further improve compressed air efficiency, some simple and effective steps can be put to action quickly.

A few things you need to do to improve the demand of your air compression: Measure the air consumption to identify sources that waste compressed air Find and fix the leaks in your compressed air system. Upgrade your blow off, cooling and drying operations using engineered compressed air products. Use intermediate storage of compressed air near the point of use Control the operating air pressure at the point of use to minimize air consumption.

Why not take your compressed air to the next level by seeing the services and products that FS-Curtis can offer?

 

Pros and Cons of Individual Compressor Controls

Previously we described the 6 different types of Basic Air Compressor Controls but what kind of control would you want for your compressor. Her are few pros and cons of the controls to help you assess the needs of your compressor.

Start/Stops

Pros

  • Simple control using only a pressure switch
  • Motor and compressor operate only when needed which saves energy
  • Good for small compressors that are 25 HP or less (depending on application)

Cons

  • Frequent starting wears down motor and compressor
  • Pressure setting to stop must be higher than required system pressure to build storage and may increase energy use
  • Loses of pressure control in the range of 35 psi
  • Limited to small compressors

Load/Unload

Pros

  • Motor compressor runs continuously which reduces wear  and tear associated with too many frequent motor starts
  • Tighter range of pressure (approx 10 psi)
  • Provides adequate storage and offers energy-efficient control of rotary screw, reciprocating and some centrifugal compressors

Cons

  • If applied incorrectly short cycles cause  premature wear and tear. There is minimal or no power savings on lubricant-injected rotary screw compressors
  • There needs to be proper blow down time and the storage capacity required for lubricant-injected rotary compressors to achieve energy savings and prevent lubricant foaming
  • Requires over-pressurizing to maintain minimum system pressure

Modulating

Pros

  • The motor and compressor run continuously reducing wear
  • Tighter range of pressure control (10 PSI)
  • Steady progressive capacity control that matches demand

Cons

  • Pressure ratios increase as inlet pressure is throttled
  • Inefficient at lower loads(lubricant-injected rotary compressors limited to 40-60% capacity; centrifugal compressors limited by potential surge and may require discharge blow off)

Dual/Auto Dual

Pros

  • Combines features of modulating, load/unload. and start/stop
  • Shuts down compressors when unloaded for pre-set duration which in turn saves energy
  • Better selects operation mode for small reciprocating compressors

Cons

  • Makes the control complex
  • The Over-run timer must be set to limit premature starting and stopping

Variable Displacement

Pros

  • Energy-efficient control scheme that gets down to 50% of capacity
  • Matches displacement to demand without reducing inlet pressure or increasing ratios of compression

Cons

  • Makes the control complex
  • High initial cost
  • Only available for 50 HP+ compressors

Variable Speed

Pros

  • Energy-efficient and precise control
  • Various rotating speeds and giving more displacement and power. These are directly proportional to speed rotation

Cons

  • Makes the control complex
  • High initial cost
  • Reduced full load efficiency
  • Efficiency of rotary screw compressor ends drop at lower or higher speeds