Longteng Machinery, a professional manufacturer of slurry pumps
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SLURRY PUMPLongteng provides reliable slurry pumping solutions for demanding mining, mineral processing and industrial applications, backed by experienced engineering, quality manufacturing and responsive technical support.
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INDUSTRIESExplore slurry pump applications across mining, mineral processing,dredging, power generation and other demanding industries.
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RESOURCESPractical resources, guides and case studies to help you select, operate and maintain slurry pumps.
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ABOUT USLearn about Longteng's slurry pump expertise, manufacturing capabilities, quality control and commitment to reliable pumping solutions.
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17
2026-10
Pump System Curve: Why Valves, Pipe Size, and Liquid Levels Change Flow
A pump system curve shows the head an installation requires at different flow rates. In a simple steady system with fixed pump speed and no active regulation, the actual operating point is the intersection of that system curve and the pump's head-flow curve. Changing the system can change flow even when the pump itself is untouched. The curve is not a permanent property of the plant. Liquid levels, vessel pressures, valve positions, fouling, open branches, and fluid properties can create different curves. For selection, the useful result is often a family of system conditions rather than one nominal line. This guide focuses on interpreting those changes and turning them into a replacement or selection review. It uses established hydraulic principles and original calculated examples. The charts are teaching models, not measured Longteng curves or data from a customer installation.
2026-10-17
17
2026-10
Pump Affinity Laws: Estimate Speed Changes Without Misreading System Flow
For the same centrifugal pump geometry operating under suitably similar conditions, corresponding flow points scale with speed, head with speed squared, and shaft power approximately with speed cubed when density and efficiency remain comparable. These pump affinity laws are useful for estimating a revised curve. They do not guarantee that an installed system's actual flow or electrical consumption changes by those same ratios. The distinction matters when specifying a variable-speed drive, changing a belt ratio, reviewing a motor frequency, or replacing a pump. First estimate the new pump performance, then determine where that curve meets the system requirement and check all operating limits. This guide explains the equations and their boundaries with independently calculated examples. The technical basis is established similarity theory and industry guidance on variable-speed pumping. No numerical example represents a Longteng model, a tested performance curve, or an approved operating-speed change.
2026-10-17
17
2026-10
Pump Best Efficiency Point: Choose for the Operating Range, Not One Peak Number
A pump's best efficiency point, or BEP, is the flow and head at which its efficiency is highest for a specified configuration and speed. It is a useful reference for selection and operating review. It is not necessarily the point where the installed system runs, and it is not the complete boundary of acceptable operation. The practical question is how the expected duty range sits relative to BEP and the manufacturer's preferred and allowable operating regions. A pump with a high peak efficiency can still be a poor selection if the process spends most of its time at a different condition or violates suction, power, or slurry-transport limits. This guide uses industry definitions of BEP and operating regions, together with original purchasing examples. Numerical efficiencies and operating schedules are explicitly hypothetical. They illustrate comparison methods and should not be read as Longteng test results, service-life predictions, or universal acceptance limits
2026-10-17
16
2026-10
Total Dynamic Head Calculation: A Complete Example with Clear Boundaries
Total dynamic head is the head a pump must add to move liquid between defined system boundaries at a stated flow. For a steady incompressible-liquid calculation, it includes elevation difference, pressure difference, velocity-head difference, and losses along the selected path. The calculation is incomplete until the flow, liquid properties, and endpoint conditions are stated. A useful general expression is H = Δz + Δp/(ρg) + Δ(v²)/(2g) + hL. The terms describe elevation, pressure, velocity, and losses respectively. Each term must use the same length unit. A pressure in bar cannot be added directly to a height in meters. This article develops an independent worked example and explains how to turn it into a reviewable pump inquiry. The energy-balance and friction methods follow established hydraulic references. Every numerical input is an explicit teaching assumption, not a surveyed installation, a Longteng project, or a pump-performance guarantee.
2026-10-16
16
2026-10
NPSH Available vs Required: Build a Suction Assessment That Covers the Real Duty
NPSH available is supplied by the pumping system; NPSH required is specified by the pump manufacturer for a defined performance criterion. A suitable selection needs an appropriate margin between them over the expected operating conditions. Comparing two numbers at the normal duty is only the beginning of that assessment. Net positive suction head, abbreviated NPSH, expresses the liquid's total suction head above its vapor-pressure head at a defined datum. It is usually stated in meters or feet of the handled liquid. It is not simply the pressure shown by a suction gauge, and it is not the pump's total discharge head. This guide explains the inputs, boundaries, and purchasing questions for centrifugal pumps. It uses industry definitions and independently calculated examples with explicitly assumed properties. The examples demonstrate a method; they do not establish a universal margin, an allowable suction lift, or a Longteng model rating.
2026-10-16
16
2026-10
How to Read a Pump Curve and Check the Proposed Duty Point
Read a pump curve by locating the required flow, finding the corresponding head on the correct pump configuration, and then checking efficiency, shaft power, suction requirements, and operating limits at that same point. A curve is a connected set of performance information. Selecting the highest head or largest flow shown on the sheet does not establish a suitable pump. Before using any plotted line, verify the pump model, speed, impeller configuration, liquid basis, and revision. Then add the system requirement. The actual operating point depends on the interaction between the pump, piping, liquid, and controls, so a point marked on a quotation is a proposal that must match the installation. This tutorial follows established industry curve definitions and develops an independent numerical example. All numerical curves in the article are calculated teaching illustrations. They are not measured Longteng curves, model ratings, or a substitute for supplier-confirmed selection data.
2026-10-16
Shijiazhuang Longteng Machinery Co., Ltd
Address: Yudi Industrial Zone, Luancheng District, Shijiazhuang City, Hebei, China.
Phone/Whatsapp:+86-15830152559
Email:info@slurrypump-hb.com
