Pulsation and Mechanical Analysis

Pulsation (acoustical) and mechanical analysis of reciprocating compressor /pump packages is the core business activity of CCPGE. The purpose of pulsation and mechanical analysis is to reduce gas pressure pulsation in the piping system, thereby avoiding compressor /pump operation complications regarding vibration, performance, reliability, flow measurement errors, etc.

Due to the intermittent gas flow through the compressor /pump suction and discharge, pressure fluctuation, i.e. gas pressure pulsation, occurs in reciprocating compressor /pump piping system. As a result, compressor /pump operation complications can arise, namely unacceptable shaking force and piping vibration, system power consumption and energy loss, intake and discharge valves damage and flow measurement errors, etc.

API 618 (5th edition, December 2007) and API 674, published by the American Petroleum Institute, present pulsation and mechanical study approaches for reciprocating compressor and pump packages, respectively. While API 674 presents 2 design approaches, specifically design approach 1 (DA1) and approach 2 (DA2), API 618 presents 3 design approaches, specifically design approach 1 (DA1), approach 2 (DA2) and approach 3 (DA3). The 3 design approaches used for reciprocating compressor packages are applicable for different cases as detailed in the table below:

API 618 Design Approach Selection

API 618 Non-dimensional Pulsation Suppression Devices Shaking Force Guideline

Bentley PULS XM is one of the most recognized software in the industry for pulsation (acoustical) analysis per API 618 and API 674 standards. It was initially developed by NOVA-HUSKY research institute in Calgary, Canada, and then improved upon by the SSD engineering consulting firm, Bentley and other companies. It is currently an effective acoustical study tool.

Mechanical analysis is an important part of Design Approach 3 (DA3) in API 618. The purpose of mechanical analysis is to adjust the piping layout and support design to avoid mechanical resonance of compressor manifold and piping systems, and thus limiting the vibration level and dynamic stress of compressor /pump package components within the allowable range.

Bentley AutoPIPE CONNECT is currently one of the most authoritative software worldwide for mechanical study. It is capable of analyzing piping system vibration and dynamic stress. Additionally, it also has a user-friendly interface with Bentley PULS XM for model data exchange.

CCPGE uses Bentley PULS XM and Bentley AutoPIPE CONNECT software to perform acoustical and mechanical studies of reciprocating compressor /pump package as per API 618 design approaches and API 674 Standard.

Acoustical Study Model of an Inter-stage System in a Gas Storage Compressor Package

Mechanical Study Model of a Gas Storage Compressor Package