EFS_September 2022_Egypt Flare_refinery example
Success stories

NATREF’ Reliability and Maintenance teams collaborate together to increase reliability of their reciprocating compressors through use of Bently Nevada’s condition monitoring platform

3 min read
Ernest Ralidzhivha
E & I Systems and Instrumentation

Customer Type: Refinery 

Industry: Oil & Gas

Application: Reciprocating compressor

Solution: BN3500 & System 1 (v19.1)


In an attempt to increase reliability and availability of their fleet of reciprocating compressors, NATREF’s Reliability team decided to equip their assets initially with basic protection measurements (in line with API 670 recommendations) to avoid any catastrophic damages resulting in expensive repairs and extended downtime; and then progress towards advanced predictive monitoring further optimizing maintenance cost.


The main intent was to save the machines from any major damage and to proactively detect faults at their outset to plan maintenance effectively. 

Conclusion & Resolution

As a trusted partner, NATREF has always sought domain expertise from Bently Nevada (BN) and the tradition continued when Bently Nevada’s Technical Leader for RECIPs visited NATREF to address their pain point(s) and collectively decided on the critical measurements for the pilot compressor for this initiative. NATREF’s experience with BN products (including sensors, monitoring system and condition monitoring platform) enabled them to carry out all engineering, installation and machine modification for sensor installation in-house (with recurring support from Bently Nevada’s Design and Installation Services – D&IS/Retrofit team).  

Reliability team established the framework on retrofit in coordination with Maintenance and Instrument teams by optimally utilizing spare slots in existing 3500 rack and connecting to existing System 1 condition monitoring platform. In the first phase, it was decided to equip machine with API 670 recommended protection parameters comprising crankcase and crosshead vibration along with piston rod position and run out monitoring. Local BN D&IS Engineer visited site and decided optimal location & design for these sensors in coordination with Maintenance and Reliability teams. The calibration of sensors onsite and system configuration was carried out by BN RECIP Certified Engineer and was reviewed by Regional Technical Leader as per Quality Assurance process. 

After box-up when machine was started, unusual high amplitudes were observed in crosshead vibration for stage 3. Reliability team consulted BN Recip Machinery Diagnostic Services (MDS) by sharing data; a detailed teleconference was conducted to identify the root cause. Based on data review it was concluded that head end (HE) suction valve (SV) and its unloader should be inspected for any possible issues since the vibration impacts were happening at HE SV opening event (@30 deg crank angle). Following inspection from Maintenance team, it was found that the HE SV was touching the unloader due to unloader stem being too long. Therefore, the clearance between the valve and the loader was adjusted to 2mm. Following the adjustment, compressor was restarted, and crosshead vibration was reduced back to normal. This showed the effectiveness of monitoring system which was able to capture faults occurring at cylinder while sensor was installed at crosshead (few meters away). Further with the domain knowledge of NATREF’s Reliability team and Bently Nevada, machine was brought back to healthy condition within a short period of 12 hours. Had this proactive approach not demonstrated by NATREF, the suction valve failure would have resulted in cylinder overheating eventually melting non-metallic consumables (packing rings, piston rings, rider bands etc.).

NATREF Success Story Diagnostic Charts


Ernest Ralidzhivha 
E & I Systems and Instrumentation

Fayyaz Qureshi 
RECIP & Retrofit Technical Leader for MEIA
Bently Nevada

Basil Mkize 
System 1 Technical Leader for Sub-Saharan Africa
Bently Nevada


Machinery diagnostic services & analytics

Copyright 2019 Baker Hughes Company. All rights reserved. Baker Hughes provides this information on an “as is” basis for general information purposes. Baker Hughes does not make any representation as to the accuracy or completeness of the information and makes no warranties of any kind, specific, implied or oral, to the fullest extent permissible by law, including those of merchantability and fitness for a particular purpose or use. Baker Hughes hereby disclaims any and all liability for any direct, indirect, consequential or special damages, claims for lost profits, or third party claims arising from the use of the information, whether a claim is asserted in contract, tort, or otherwise. Baker Hughes reserves the right to make changes in specifications and features shown herein, or discontinue the product described at any time without notice or obligation. Contact your Baker Hughes representative for the most current information. The Baker Hughes logo, the Bently Nevada logo, and System 1 are trademarks of Baker Hughes Company.