【Daily Question: Pump Equipment】Weekly Summary June 30, 2019

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Monday (2019.6.24) https://bbs.hcbbs.com/thread-2731305-1-1.html 1. In Plan11, the flow rate for flushing the mechanical seal, the flow rate in the balance tube of multi-stage pumps, and the flow rate for internal cooling circulation in magnetic pumps all represent flow losses; they all fall under the category of volumetric losses of pumps (correct)； 2. For the calculation of foundation bolts, aside from wind loads and seismic loads which are random loads, static equipment has no other dynamic loads except for static loads (correct). Tuesday (2019.6.25) https://bbs.hcbbs.com/thread-2731846-1-1.html 1. Whether it is a pressure-bearing component or not, except for the mating surfaces and sealing surfaces, the outer surface of carbon steel components should be coated for protection (correct) ； 2. Parts (made of carbon steel) that have undergone surface treatment with blueing (also known as blackening, bluing, or boiling blackening) can be stored in a warm and humid environment for at least a month without their surface becoming corroded (Incorrect – the surface of carbon steel after blueing treatment has weak corrosion resistance; the main advantage of this treatment is to improve its aesthetic appearance). Wednesday (2019.6.26) https://bbs.hcbbs.com/thread-2732262-1-1.html 1. The open and semi-open impellers of centrifugal pumps are suitable for liquids containing solid particles, fibers, suspended matter, and substances that tend to crystallize (Correct) ； 2. A standard flat key is denoted as: C 10 x 8 x 50, which indicates that both ends of the key are semi-circular in shape (incorrect – one end should be semi-circular while the other end is flat). Thursday (2019.6.27) https://bbs.hcbbs.com/thread-2732696-1-1.html 1. The thickness of the single-layer metal isolation sleeve in atmospheric-pressure magnetic pumps is generally around (1-2) mm ； 2. The radial one-sided clearance of the sliding bearing in a shielded pump is generally around (0.05–0.2) mm. Friday (2019.6.28) https://bbs.hcbbs.com/thread-2733089-1-1.html Please briefly explain what you understand by the term pump NPSHR Keywords: from the pump inlet to a point slightly ahead of the impeller inlet, flow velocity increases, pressure drop, higher than the vaporization pressure. Saturday (2019.6.29) https://bbs.hcbbs.com/thread-2733540-1-1.html I’m taking time off for work reasons; stay in touch, friends. Wishing everyone a pleasant weekend! ! !