Positive–displacement pumps, however, tend to have sufficiently tight sealing between the moving parts and the casing or housing of the pump that they can be described as self-priming. Such pumps can also serve as priming pumps, so called when they are used to fulfill that need for other pumps in lieu of action taken by a human operator. 
The self-priming pump market is segmented on the basis of Equipment into Electric and Diesel; by Head size into below 30m, 30-50m, 50.1-100m, 100.1-150m and above 150m; by Horsepower into Below 1 HP, 1-3 HP, 3.1-5 HP, 5.1-7 HP, 7.1-10 HP, 10.1-100 HP, Above 100 HP; by Application into Residential, Agriculture, Oil & Gas, Commercial, Mining, Industrial, Water & Wastewater and by region. This market is expected to reach a market size of USD 40 Billion over the forecast period (2018-2027).
The conventionally used pumps require priming at regular intervals which tends to be time consuming and labor intensive. The self-priming pumps are a very attractive alternative to this technology as these do not require priming and is also labor efficient.
Global Self-Priming Pump Market is likely to grow significantly in the Asia pacific region (China, Japan, India and rest of Asia Pacific) and North America (the U.S. and Canada due to the increased operations in areas such as infrastructure development and agricultural activities.
In terms of regional platform, North America is anticipated to capture the highest growth with CAGR of 4.88% over the forecast period (2018-2027) due to the various field which requires this type of pumps.
The increase in global population has resulted in an increased demand for infrastructure development activities for residential areas and agriculture activities to meet the food consumption requirements, are positively affecting the use of the motors pumps. Also, increasing demand due to changing consumer behavior is a cause of performing the various operations of construction and farming which requires the self-priming pump because it eases the quality of work while also being time efficient. Also, the changing agricultural practices to allow more time and labor efficient efforts that have resulted in an increased demand for self-priming pumps to meet the agricultural demands.
Expansion of Self-Priming Pump Market
Factors such as increase in the farming and infrastructure development activities along with favorable government policies such as Indian Pradhanmantri Awas Yojna led the use of the self-priming motors in the country with a highly booming agricultural sector. Another factor aiding the demand for self-priming pump industry is the cost of the pumps. These are much easier and cheaper than other motors such as diesel operated pumps.
One of the most important restraining factors affecting the demand of self-priming pumps is the requirement of priming of the equipment prior to the usage. During the pre-pumping process, it undergoes priming with water which is a time consuming and a labor intensive process.
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