Faqs about our pumps

Frequently Asked Questions

You can find some of our most frequently asked questions here. Simply click the question to reveal the answer.

Have you checked out our Fault Finding and Trouble Shooting for diagnosing any issues?

What is a blowers "Slip"?

Each rotor of a Roots type blower turns at an equal speed but in the opposite direction to the other. This is achieved by using a pair of equal ratio gears to drive the rotors. Using this type of configuration, blowers can run without internal lubrication to the rotors, as they never come into contact with either the outer casing or each other, thus air is delivered completely oil free.

As the rotors turn, air is drawn into the inlet side of the blower and travels around the outer casing of the machine in the pockets between each lobe of the rotor. Once at the discharge side of the blower the air is forced out and stopped from passing back into the chamber by the finite clearances between all of its’ internal components. The tiny amount of air that does manage to pass back through these minute clearances is what is known as blower “Slip”. The greater the difference between the inlet pressure (normally below atmospheric pressure) and discharge pressure (normally above atmospheric pressure), the higher the level of slip will be. 
The higher the temperature of the gas being handled, the higher the level of slip due to the decrease in the density of the gas allowing it to more easily pass through the small fixed internal blower clearances.

Do you supply blowers capable of pressures above 1 mbar (14.5 psi)?

All of our blowers are capable of achieving a pressure rise of up to 1 Bar at sea level.The pressure rise is defined as the difference between the inlet pressure (normally below atmospheric pressure) and discharge pressure (normally above atmospheric pressure). Higher pressure rises can be achieved by staging two blowers in series (ie. The discharge from the first blower becomes the inlet of the second machine).  These packages are assembled on a single base frame ready to go into service once they have been bolted down, connected up to the system pipe work and wired into the electrical supply. Details of these tandem units can be found on the Custom Packages section.

What can I do to prevent the blower from exceeding its design capacity?

Each of our blowers carries a badge showing it’s Model and weight as well as it’s maximum speed and pressure rise.Packaged units will have been sized for a specific duty to match your system requirements and will carry a badge to indicate the pressure, speed, absorbed power and weight of the package as appropriate to this particular application.  Exceeding the application pressure may not be detrimental to the blower (as long as it does not exceed the blower capability as shown on the blower badge) but may overload the electric motor or cause the drive belts to slip and could also damage other parts of your system. All packaged sets are supplied incorporating a pressure relief valve which will be set to 10% over the duty pressure but we strongly advise the use of an over pressure switch (to stop the unit if the condition persists) or an unloading valve.  This will protect the motor, drive and all parts of the down stream system.

My blower seems to be getting much hotter than usual. What are the likely causes?

My blower seems to be getting much hotter than usual. What are the likely causes? :

Packaged units will have been sized for a specific duty to match your system requirements and should not run excessively hot without good reason. Common causes of excess heat in the blower’s body, bearings and casings could be caused by one or more of the following:

The pressure rise across the blower has risen to exceed its’ design capability due to:

  1. The blowers’ inlet filter has become blocked and either needs cleaning or replacing.
  2. There is a blockage in a conveying line and the blower is running against excessive back pressure.
  3. A non return valve has been installed back to front in the wrong direction of flow or has jammed in the closed position.
  4. A shutoff valve is either closed or partially closed.
  5. Water levels in an effluent treatment aeration system have risen to create additional line pressure.
  6. The ventilation fan of a package within an acoustic enclosure or building is switched off or has failed.
  7. The blower is running off a variable speed drive (inverter) which has slowed the machine to a point where it is no longer pulling in enough cold air at the inlet to keep the blower within design temperature limits.

Incorrect Lubrication:

  1. Incorrect grade and/or type of oil.
  2. Incompatible grade or type of oil used to top up gear box.
  3. Insufficient oil.
  4. Too much oil.
  5. Incorrect grade and/or type of grease.
  6. Incompatible grade or type of grease used to top up bearing.
  7. Insufficient grease.
  8. Too much grease.

What is the difference between the compact packages and the standard packages?

Compact packages are designed with a smaller footprint and smaller enclosure than the standard package and are therefore more competitively priced. They come supplied with just the basic accessories necessary for trouble free running. For information on which package would best suit your requirements, please contact us for further advice.

What oil and grease should I be using for lubrication on my blower?

The type of oil and grease will vary depending upon ambient conditions and the duty of the machine. The use of inappropriate or incompatible lubricants can have disastrous results. Please refer to the documentation supplied with the unit, or contact us for more information.

What do the numbers represent in the packages model numbers?

The first part of a package model number represents the blower model. BS (bed set) defines it as a packaged set and this is followed by the motor power eg. 18.5 means an 18.5 Kw motor. The final numbers and letter (after the /) show which design of base frame has been used.

My blower won't go up to the pressure I require. What is wrong?

Roots type blowers are positive displacement machines but no gas compression takes place internally. The application and system piping restrictions create the pressure against which the blower operates. Air leaks in the system, a leaking pressure relief valve or incorrect blower selection for the required duty may be the cause. Please contact us if you are unable to resolve the problem.

How much grease do the bearings need and how often should it be applied?

The answer to this will depend entirely upon the duty being performed by the machine. Clearly, a blower which runs 24/7 will require more frequent attention than one which runs for only a few hours each week. As a general rule, 3 or 4 pumps from a grease gun containing the correct grade of grease will be adequate. Care must be taken not to over grease as this can cause the bearing to overheat leading to carbonisation of the lubricant and rapid bearing failure. The bearing cap should never be more than one third to half full.

The pipelines of my system keep filling with water from the tanks that are being aerated. What could be the cause?

One of the main causes of this problem is a faulty or missing non return valve in the discharge line. Thus, when the blower stops, the pressure remaining in the discharge line tracks back through the damaged non return valve and out to atmosphere through the blower. Water is then able to travel back up the discharge line when it will at least find it's own level and in some instances will actually siphon back into the casing of the blower itself.

Should this occur, the unit should be isolated and appropriate checks and remedial action taken as soon as possible. If water has been ingested into the blower, it should then be run under normal load for a period of time to dry out the inner casing and rotors. Following this procedure will avoid rusting of the blower internals which can lead to serious damage and possibly complete seizure.

Our Products All of our Air Blowers, Industrial Compressed Air Blowers and Package Sets are fully tested. View the full range >>>
Why should you consider Hadron Blowers & Pumps Why should you consider Hadron Blowers & Pumps
Hadron Blowers include
features such as...
  • Oil at both gear and drive ends,
    for ease of maintenance.
  • Cast iron, ribbed casings to
    ensure adequate heat dispersal
    & increased rigidity.
  • Easily accessible complete
    package units.
  • Dynamically balanced rotors
    which reduce vibration and noise.
  • Self tensioning belt drives,
    reducing wear & service times.
  • Easily accessible complete
    package units.
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