NSPH, Cavitation and Recirculation in Centrifugal Pumps– Impact and Remedies (0.6 CEUs)

Name: NSPH, Cavitation and Recirculation in Centrifugal Pumps– Impact and Remedies (0.6 CEUs)
Price: 497.25 CAD
Availability: InStock

Course Code: MEC119

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Description

Cavitation is a destructive and problematic phenomenon in the fluid transfer overall and in pumps in particular. It is frequently talked about in the pump industry. At the same time, there are several standards, OEM recommendations, best practices, and plethora of information on how to avoid cavitation. Related to cavitation is Net Positive Suction Head Required and Net Positive Suction Head Available terms. In in the light of the above-referred information, in this course we will go through the details of:

The reasons and manifestation of cavitation,
The phenomenon of recirculation and factors leading to recirculation,
The Net Positive Suction Head Available and Net Positive Suction Head Required,
Differentiation between recirculation and cavitation,
Testing of NPSH required for pumps with low NPSHR values,
Steps to overcome or mitigate the adverse effects of cavitation and recirculation.

At each stage during this course there are exercises to assist the participants to understand the topic and have a feel of the subject by working with numbers, graphs, and results.

Objective

To understand:

• The terms NPSHi, NPSH3, NPSHR (required) and NPSHA (available),
• Cavitation, recirculation phenomenon and identify the difference between the two.

After attending this course, the participants will be able to:

• Measure NPSH – NPSH testing, permissible tolerances,
• Provide adequate NPSH margin as per industry guidelines and HI recommendations,
• Improve the NPSHA and reduce NPSHR,
• Mitigate the adverse effects of cavitation, recirculation.
• Select a pump for an application based on specific speed, suction specific speed, suction energy,
Select suitable material of construction based on the duty point and service of the pump,

Target Audience

Engineers, supervisors, other professionals in general industry including energy, Oil and Gas and service sectors using pumps and pumping systems and working on:

Process design and engineering,
Selection of pumps and pumping systems,
Inspection and testing of pumps,
Operations and maintenance,
Troubleshooting and root cause analysis,
Quality Assurance, inspections, and approvals,
Reliability and asset management.

Level of Course

The course requires a basic understanding of pumps and pumping systems, fluid flow and a level of proficiency in engineering calculations. Acquaintance with the phenomenon of cavitation and NPSH will help in gaining full advantage of the course.

Learning Objectives

This is an intermediate course which requires a basic understanding of pumps and pumping systems, fluid flow and a level of proficiency in engineering calculations. Acquaintance with the phenomenon of cavitation and NPSH will help in gaining full advantage of the course.

This is hands on course. It is based on input from the field data, recommendations from the standards such as ANSI/HI, API and ISO and inputs from leading pump manufacturers published in their handbooks. Moreover, inputs based on industry experience, published papers, and findings presented and published in international seminars and journals on the subject are synthesized to build the information base presented here. After going through this course, the participants will be able to apply this knowledge towards the solution of their day-to-day problems related to cavitation and NPSH.

After you attend this course/workshop, you will be able to:

Differentiate between the cavitation and recirculation phenomenon,
Select suitable pump type for a given application based on its specific speed, suction specific speed, suction energy,
Select suitable material of construction based on the duty point and service of the pump,
Configure the system to mitigate the effects of cavitation.

Material(s) Required

Laptops or calculator

Ghazanfar Ullah khan

Ghazanfar Ullah Khan has a total of 38 years of work experience in multicultural work environment. He has been working as a technical & management trainer & consultant for the last 5 years. He has a vast experience as Director Operations, Technical Director & has actively led many international projects with renowned international companies. He has successfully rolled out several key projects in relation to designs, manufacturing, operation & commissioning of products & systems including SAP & ERP system implementation.

Ghazanfar Ullah Khan has exceptional leadership & team management skills with remarkable mentoring & coaching acumen.

Basics of Pump Hydraulics

• Introduction to pump standard curves

• Specific speed and its impact on pump performance

− Impeller specific speed,
− How to calculate the specific speed?
− Relationship of specific speed to the pump performance curves
− Specific speed and shape of the NPSH curve

Exercise on specific speed

• Understanding NPSH
• Pump selection and NPSH
• Cavitation
− Explain the cavitation phenomenon,
− Types of cavitation, Effects of cavitation.

• Suction specific speed

− Definition of suction specific speed,
− How to calculate the suction specific speed?
− Relationship between suction specific speed and recirculation,
− Relationship between suction specific speed and reliability.

Exercise on pump specific speed calculations

• Recirculation
− Q – H curve and recirculation area,
− Relationship between suction specific speed and recirculation,
− How to prevent recirculation?

• NPSH margin

− What is NPSH margin?
− Which factors influence NPSH margin?
− ANSI/HI 9.6.1 guidelines for NPSH margin.

Exercise on NPSH margin

• NPSH testing

− When to conduct NPSH test,
− Types of NPSH tests,
− Test bed setup,
− Effect of dissolved air on testing and test results,
− Effect of viscosity on NPSHR.

• NPSHA/ NPSHR – cavitation, recirculation,

• Reliability vs. NPSH margin

− Relationship between suction specific speed and reliability,
− NPSH margin and reliability of the pumping system,
− Definition of Suction Energy and its impact on reliability.

Exercise on reliability and NPSH margin

• Detecting cavitation

− Different methods used to detect cavitation,
− Understand use of each method.

• Overcoming cavitation and its effects

− How to increase the NPSHA,
− How to decrease the NPSHR,
− How to reduce the impact of cavitation on pump internal.

Wrap up session and Question and answers

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