Month: February 2015

February 21, 2015

Oil & Gas Industry Offshore Drilling Equipment – The Definition of Toughness

As anyone in the industry will tell you, the technology for exploration and retrieval of Oil or Natural Gas harnesses some of the most powerful and unique engineering machinery in the world. Both the scale and scope of this equipment is such that it tests the limits of human engineering and drives the creation of awe inspiring, powerful machines and processes.

Add to this however, typical deployment scenarios for such equipment, like a drilling platform in the middle of the North Sea in winter, or underwater at a pumping substation, or in the high power electrical substations of rigs where temperature and cooling control are critical and you can begin to understand the stringent engineering requirements that flow down to every system, subsystem, and component used in the design and manufacturing of this equipment.

It is in this kind of environment that CPI Switches and Sensors were designed to live.

While there are literally thousands of possible applications for our waterproof switches in this kind of equipment, here are just a few that we are aware of.

CPI Switch Products in the Oil & Gas Exploration Industry

Valve Position Sensing – In this application, open close control of remote valves is achieved through use of our J4 series waterproof ball switch. Selected for its durability and ability to withstand wet and windy environments with its dual seal design.

Air Shut Off Control – In this application our J4 plunger switch helps regulate the flow of cooling air to Genset’s providing critical power to drilling operations.

Compressor Overtemp Switch – In this application CPI Bimetal Thermal switches also detect the operating temperatures of onboard compressors, allowing precise control of engine RPM’s and cooling system activation.

With dozens of other applications for our waterproof switches and sensors, we are well positioned to be the best choice for design of high reliability systems. Contact us today.

This blog was originally published on our website at http://www.cpi-nj.com.

 

February 9, 2015

When Bi-metallic Thermal Switches Are Really the Only Good solution

In an era where many applications have gone the way of cheap remote sensors and electronics, there is still a place for electromechanical bimetal switches that is cost effective, reliable and in some cases the only solution to complex operational requirements.

Thermal switches are often specified as cut-off switches because they represent a straight-forward approach to shutting down a system if a critical temperature is reached. The simplicity of an electromechanical thermal switch is what makes this approach so desirable to designers, as they are passive devices which require no power, and will reliably change state at the specified set point.

There are some key attributes to consider when trying to understand whether a bimetal thermal switch is the right choice for your application.

  1. Will a passive sensor handle the temperature range required? Our Rod & Tube series can go up to 1750F, a temperature that would melt many other kinds of sensors.
  2. Is the operating environment stable? Sensors tied to control systems may be more sensitive to local factors in the system such as vibration, EMI, current or voltage limitations, response time, etc…
  3. Is your system self-contained or does it maintain remote operational control? Remember that thermal switches actually achieve an open or a closure when a programmable set point is reached. Sensors generally have to have their output calibrated and monitored to determine temperature and then separate commands are sent to other electronics to achieve contact closure.
  4. Are you budget or form factor limited? CPI thermal cutoff switches come in a wide variety of mounting options including custom designed variations.

In general, the more demanding your environment, the more likely you are to be considering a self-contained bimetal thermal switch. You would not be alone. See below for a list of applications that have gone the way of bimetal thermal for a variety of reasons.

  • Plastics extruder barrel overtemp detection.
  • Brake overtemp indication
  • Engine cooling fan control
  • Clutch overtemp in escalators
  • Bleed air overtemp indication on aircraft environmental control systems
  • Window defrost overtemp on military vehicles
  • Overtemp detection in oil refinery processes
  • Avionics overtemp inside the aircraft avionics bay
  • Gas shut-off  flame detection on railroad switch de-icing
  • Flame detection in aircraft engine

CPI Is a World Recognized Expert in the Design and Manufacturing of Thermal Limit Switches

CPI produced its first thermal switches for the military in 1946 and has continued to provide these switches into military and commercial markets where only the toughest parts need apply. If you have an application tough enough for our parts, do give us all, we’d love to hear about it.

This blog was originally published on our website at http://www.cpi-nj.com.