A Zero Fluff Handbook On Pump Design And Hydraulic Calculations – Michael Kay Hoffmann (1)

Starting from the top we have the QH-curve which describes the head (left y-axis) that the pump will produce at a given flow (x-axis). Next line is a parable-like curve with a high vertex. This is the efficiency curve for the pump. The vertex of this curve is the Best-Efficiency-Point (BEP) and the efficiency can be read on the right y-axis.

Some pump performance curves like this one will have a second efficiency curve below it, which represents the combined efficiency of the pump and the motor. This is usually included in the graph if the pump comes with an included motor-unit. On the bottom graph (that shares the x-axis with the top graph), the first curve is P1 – the total power consumption of the pump and motor combined as a function of volumetric flow rate. If no motor comes natively with the pump, only the second QP-graph for P2 will be there.

That’s the power consumption of the pump itself. Now the very bottom curve is the NPSHr, but usually just denoted NPSH. This will be expanded upon in subchapter 3.6. We will be doing some example walk-throughs in this book to fully engrain the understanding of the pump curve. For now let’s dive into system characteristics (System Curve) and see the important interplay between these and pump curves.

A System Curve is a QH-curve for the collective downstream and upstream factors that impact pump performance. Understanding by a real example is always good, so let’s look at a case where we want to draw the system curve for a system where water is being pumped from one tank to another: Figure 3.5.3: PFD example to illustrate system characteristics.

To create the function: H(Q), we use the mechanical energy balance derived in subchapter 3.4 (equation 3.2 & 3.3). Using equation 3.2 where v is equal to v2 since v1 is insignificantly small: (3.6) Δ𝑝 𝝆𝑔 + Δ𝑧+ 𝑣 2𝑔+ 4𝑓 𝐿𝑒,𝑡𝑜𝑡𝑎𝑙 𝑣 2𝑔 H here represents the total pressure in meters that a pump would have to produce to lift the liquid, overcome the friction in the pipe and fittings and arrive at the second tank at pressure, P2.

1.1 Purpose and Scope The purpose of this handbook is to let you become a high value engineer who masters the powerful skill stack of pump design, hydraulic calculations, financial analysis and value propositions. The concise format aims to be a value-dense reference for both you as a student of process engineering and for you as a working professional who wishes to apply engineering knowledge, mathematics and financial analysis on real-life engineering installations. The handbook includes step-by-step guides for your most common issues when you design and optimize pump performances.

It will also guide you in hydraulic calculations and how to avoid or resolve cavitation issues. In addition, this handbook includes a chapter on how to create impactful value propositions to any engineering investment. The idea is that you will set yourself apart from your peers in a major way, when you as an engineer are able to analyze financial impacts of technical change and know how to communicate these insights to decision makers in your business environment.

2 1.2 About the Author Hey there, I’m a Chemical Process Engineer with a passion for learning, teaching and sharing my knowledge. I got my degree in Chemical Engineering from the Technical University of Denmark and the University of British Columbia, Vancouver and now live and work in Amsterdam.

During my studies I was frustrated with a lot of the heavy engineering books we had to read, because of the amount of unnecessary information packed into each chapter and the obsession with academic wording and sentence structuring. I remember thinking to myself back in the day: “There must be a simpler way of conveying these concepts and methods!” My goal is to create valuable down-to-earth study material and handbooks for applied engineering. For this book, I have chosen the topic of hydraulic calculations and pump design based on my real-world engineering experience as it proved to be the most available skill in my toolbox coming out of university to save my clients and employers money and improve their processes.

The ability to design and optimize pumps and hydraulic systems taught in this book and the methods to present these investment opportunities to higher level management made me a very valuable asset to the organizations I worked for. I wish for all my readers to become high-value-engineers and trusted advisors for the companies that they work for. Thanks for purchasing this book on Pump Design & Hydraulic Calculations.

I’m excited to share my knowledge and experience with you, and I hope it will be helpful for your learning and professional development.

This is a short excerpt from the opening of “” by Unknown, quoted for review and introduction purposes. All rights belong to the copyright holders.

Book Information

• Unique ID: 88a9bb6e80b3ac4b
• File Extension: .pdf
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• Title: –
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• Pages: 85
• Language: English (en)

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