How to interpret the curve graph of China ATACH Industrial Water Pump Factory?

After the customer provides the required pump specifications, when ATACH provides the pump quotation, they usually attach the performance curve chart of the pump to the quotation for the customer's reference. So, how should we interpret the data information on the performance curve chart? 

1. The performance curves of the water pump mainly include the flow-head curve (Q-H), the flow-power curve (Q-P), and the flow-efficiency curve (Q-η).

2. First, check if the curve is smooth and if there are any peaks. The smoother the pump curve, the better. Of course, peaks are not allowed. Then, compare which one has a higher efficiency. Finally, compare which range is wider, as a wider range makes adjustment and usage easier.

3. In production practice, the operating condition point of the pump must be selected according to the performance curve of the pump, so that the pump can always operate within the rate range.

4. On the performance curve, for any arbitrary flow point, a set of corresponding head, power and efficiency values can be found. Usually, a set of corresponding parameters is called a working condition point and is referred to as the best working condition point.

5. Operating the pump at the most efficient point is the most ideal. However, the user's requirements vary greatly and may not be consistent with the performance at the most efficient point. Therefore, a range (with an efficiency drop of 5% to 8% as the boundary) is specified. The pump operates within this range, and the efficiency drop is not too significant. This range is the pump's working range (also known as the range). When it exceeds this range, the efficiency is low and it is not economical. 

Reference:

There are three common types of performance curves:

1. Flat performance curve

This type of performance curve is suitable for systems with a wide flow regulation range and a relatively small pressure change. It is applicable to systems where the requirement for head changes slightly and the requirement for flow change is relatively low. Most pumps, such as single-stage centrifugal pumps of IS type, D-type pumps, double-suction pumps, and IH chemical centrifugal pumps, have relatively flat curves.

2. Steeply declining performance curve

This type of performance curve is suitable for systems where the requirement for flow is high but the requirement for pressure is low. Generally, pumps like screw pumps have this characteristic.

3. Curves with humps

Pumps with humps in their performance curves may experience unstable operating conditions during operation, with noises and vibrations occurring. Such situations are generally not allowed.

The performance parameters of a pump indicate the performance of the pump. However, each performance parameter is not isolated or static; instead, they are interrelated and mutually restrictive. For a specific pump, this interrelation and restriction has certain regularities.

Fully understanding the performance of the pump, familiarizing oneself with the characteristics of the performance curve, and mastering its changing patterns are extremely important for rational pump selection and matching, accurately determining the installation height of the pump, adjusting the operating conditions of the pump, and strengthening the scientific management of the pumping station.