Tips for better priming or re-priming a Japy pump?

How to prime or re-prime a Japy pump?

Whether you are accustomed to them or simply an occasional user of Japy pumps, you may face the issue of a pump inadvertently stalling, and despite several attempts to re-prime it, the water, oil, liquid, diesel or any other matter to be transferred does not get pumped.

As stated by the chemist, economist, biologist, physicist and university professor Antoine Laurent de Lavoisier, “nothing is lost or created, but simply transformed”. It is thus possible to achieve a positive outcome for a Japy pump that does not re-prime. Below are some of the most common situations that we have witnessed irrespective of the manufacturing date of your pump which, as you should keep in mind, is the fruit of a concept invention by Frédéric Japy in 1850:

  • lack of water or strainer is not immersed,
  • well output is insufficient in the case of a well pump,
  • suction height greater than the capacity of the pump,
  • leakage at the check valve (CV),
  • presence of trapped air (air bubbles in the circuit) in the suction part of the pump,
  • leakage or lack of watertightness,
  • faulty internal priming valve (climatic events or faulty Venturi valve)
  • faulty wear parts.

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How to prime a Japy surface pump or a Japy water pump?

To re-prime a surface pump, also known as a multi-stage pump, a water pump (manual, electrical, etc.) or an immersed pump, the first step consists of ensuring that your pump model has been chosen appropriately, taking into account the stress that you intend to apply on it.

For this, numerous parameters enter into the equation, in particular the discharge head, the TDH, the length of the discharge hose and even the flow rate and pressure of your surface pump. Keep in mind that the Total Dynamic Head (TDH) of a pump is calculated by adding the discharge head of the pump, its pressure and the length of the discharge hose with which it is equipped.

Starting from this observation, it will be possible to prime your Japy surface pump without any difficulty. After calculating the TDH, you may realise that your pump does not correspond to the desired requirements. For instance, the suction depth may exceed 8 metres, in which case we can point you towards our range of immersed pumps, which will be more capable of controlling the water without any risk of overheating your surface pump.

You can order replacement parts rapidly in the event of a breakdown

Whether it is a JET self-priming surface pump, a multi-stage pump or an automatic surface pump, the reason preventing you from re-priming your pump may be the fact that the surface pump's installation plan was not followed to the letter, or that a mechanical, electrical or hydraulic part was damaged.

In this case, our team of experts is ready to assist you in your operations for repairing your surface water pump. Based on your specifications, we will advise you on the appropriate process to be followed. It is not rare for certain mechanical or even electrical parts, referred to as “wear parts”, to be faulty and it becomes necessary to replace certain spare parts of your surface water pump. For this, please contact us for rapid and effective assistance.