“The project is in Yunnan” is not enough to establish pump suction conditions. Locations, pump-room arrangements and duties can differ within one city or prefecture. Prepare actual site information for the designer to assess the selected pump.
Basic principles still matter
Grundfos technical information relates cavitation to local pressure in the pump falling below the liquid’s vapour pressure. Available and required net positive suction head need checking. Selection references consider atmospheric pressure, water temperature, suction losses and pump curves. Conditions or margins from one example must not be transferred to a different project.
Information for the designer
| Site item | Information to provide | An inadequate substitute |
|---|---|---|
| Location | Verifiable project location and pump-room layout | A city or prefecture’s average altitude |
| Water level and temperature | Operating range, low-water condition and measurement dates | Only photographs taken without load or with a full tank |
| Suction pipework | Diameter, length, valves, filters and connections | Only the outlet-pipe size |
| Operating duty | Hourly demand, zones, start-stop pattern and potential peaks | Daily volume in place of a pump duty point |
| Pump documents | Complete model, performance curves and application notes | Curves for another brand or a similar model |
What a remote enquiry can address
With adequate information, selection questions and missing records can be discussed first. Site installation, electrical work, testing and commissioning are confirmed per project. Follow site procedures for unusual noise, vibration or loss of flow; do not repeatedly restart pumps or adjust valves solely on webpage advice.
Frequently asked questions
Can fixed pump parameters be supplied based on Kunming, Diqing or Nujiang alone? No. A regional name helps locate enquiry information; it is not a measured site condition.
Does a motor’s suitability for altitude establish suitable pump suction conditions? These are separate questions. Request the relevant documents for each piece of equipment.
References and scope
References checked on 9 October 2026. These are public reference materials. Gudian prepared the information checklists for project enquiries. A supplier manual does not establish a brand authorization for this website, and a paper does not show that Gudian equipment has achieved its research results.
- Grundfos: cavitation in pumps and CRT/CRTE technical references; Official technical information checked on 9 October 2026; check the data-booklet version for the actual pump separately. A reference for NPSH and suction conditions, not transferable pump parameters or a universal safety margin.
Further preparation
- High-altitude project information
- High-altitude water-treatment information
- Information for Yunnan’s 16 regions
Equipment and consumable requirements can first be discussed remotely. Supply, installation and site visits are confirmed for each project. Send only the equipment and water-quality information needed for the enquiry, and conceal personal contact details and sensitive third-party information in photographs.