Understand the Harmonic Analysis and Ensure the Pressure pulsation comply with API 674

The points that will be covered in this article are:Introduction

• Reviewing the Static Model
• Creating the Harmonic lnput
• The Harmonic Analysis
• Result Review
• Acoustic vibration and resonance is caused by Positive displacement pumps

Harmonic analysis considers the effect of a harmonic load being applied to the system.The load is usually applied as a sinusoidal function (Fig. 1), e.g. pressure pulsation from reciprocating equipment. Being of a cyclic nature, harmonic loading relates to the fatigue allowable of the design code, and should be considered. Care should be taken when undertaking a harmonic analysis for accuracy of input data. Information relating to existing field problems can be derived from measurement of pressure pulsation, deflection, forces, etc.

Fig.1: Introduction to Harmonic Analysis

Follow steps shown in Fig. 2

The effect of damping on the response:

The Frequency-phase Dialog:

Fig. 4: The frequency phase dialog

Results Review:

Results-Displacements:

Results-Loads:

Results-Stress:

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