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Becht Engineering Blog

In this section of the site contributing authors submit interesting articles relating to the various services, industries and research & development efforts of Becht Engineering.

Process Centrifugal Compressor Oil Seals

Process Centrifugal Compressor Oil Seals
Ingersoll Rand Cone Oil Seals Compressor process shaft end seals are designed to seal the rotating assembly in the stationary compressor case to prevent the process gas in the compressor from escaping to the atmosphere and to prevent the atmosphere from getting into the process gas.   Shaft end oil seals, as compared to the relatively new dry gas seals, have been in the machinery world since the inception of centrifugal compressors.  A comparison of advantages and disadvantages for each type of compressor shaft end seal (gas or oil) will not be covered in this article.  It is safe to say that today’s trend is to purchase new centrifugal compressors with dry gas seals, and where feasible, to retrofit existing oil seals with dry gas seals. Purpose The purpose of this article is to outline the basic components of a compressor oil seal and support system, with a brief description on how...
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Reciprocating Compressor Cylinder Alignment (Often overlooked as a failure root-cause)

Reciprocating Compressor Cylinder Alignment (Often overlooked as a failure root-cause)
Compressor cylinder bore misalignment can cause failures that are often not attributed to misalignment. Crosshead shoes uneven wear, compressor piston rod failure at both the crosshead and at the piston, compressor piston rod coating failure, piston wear and compressor cylinder bore wear can all be attributed to cylinder misalignment. The objective of this article is to highlight the importance of cylinder alignment and expose the problems associated with cylinder alignment so the next time you experience one of these types of failures, checking the cylinder alignment is included in your failure investigation. Assumptions often lead to bad results. In the case of reciprocating compressors, I have found that there are two assumptions about the cylinder bore to crosshead bore alignment that have caused unexpected problems. The first assumption is “if the compressor rod runout is in tolerance then the cylinder bore alignment is in tolerance”. The second is “the male and...
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Recent Comments
stanley fussell

Reciprocating Compressor Cylin...

Jimmy thanks for your question. The flywheel should have been balanced by the OEM at the time of manufacturing. The flywheel shoul... Read More
Monday, 18 November 2019 16:35
Guest — Jimmy

Tolerance

Hi Randy & Stanley, Is there any rule of thumb on tolerance of cylinder alignment depends on size of the compressor (cylinder lin... Read More
Monday, 21 October 2019 06:58
stanley fussell

Reciprocating Compressor Cylin...

Jimmy, there are some rules of thumb for this tolerance, I have found it best to use the tolerances established by the Original Eq... Read More
Friday, 25 October 2019 17:58
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Oil System Cleaning - Making Oil Flushing a Predictable Procedure

Oil system cleaning or Oil Flush has humbled many Machinery Guys . What seems like a very simple task often turns out to be to the Achilles' heel and often unpredicted and embarrassing critical path of the machinery overhaul. The purpose of this article is to outline improvements that we have implemented to the old-fashion "Flush and Pray" procedure that will make the planning and execution of your routine oil flushes a predictable and successful part of your machinery overhaul. After finding ourselves in the "Flush and Pray" situation and trying to explain the overhaul start-up delay caused by flushing delays several times, we worked on ways to improve oil flushing procedures and effectiveness. We developed new methods and procedures to assure success in the allotted time. These new methods and procedures were used and constantly improved over time. The "Flush and Pray" procedure has been replaced with improved methods and...
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Randy Passman & Stanley Fussell

Stanley B. Fussell

Sorry for taking so long to respond. I had some health issues that postponed my response. The risk associated with not cleaning th... Read More
Monday, 14 October 2013 17:17
Guest — EVELYN SERRANO

What are the potential risks a...

Can you please tell me what are the potential risks that can occur before, during and/or after the process? How do you mitigate s... Read More
Tuesday, 08 October 2013 17:11
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Process Compressor Gas Seals

Process Compressor Gas Seals
This is the second article in a planned series where questions related to process machinery will be addressed. The intent of these articles is to answer general questions you may have about the machinery that you work with or manage on a daily basis. In each article we will address different systems associated with the operation and maintenance of process machinery. Your comments on this article would be greatly appreciated. Or, if you have suggestions for additional topics of interest, you can reach us via comment at the end of the blog. PROCESS CENTRIFUGAL COMPRESSOR GAS SEALS The purpose of this article is to outline the basic components and operation of a compressor gas seal system. Compressor process seals are designed to seal the rotating assembly in the stationary compressor case to prevent the process gas in the compressor from getting to the atmosphere and to prevent the atmosphere from getting...
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Recent Comments
Guest — Ironline Compression

Guest-Process Compressor Gas S...

It is a comprehensive blog post on process compressor gas seals. Working of process compressor gas seals is also worth reading. Th... Read More
Thursday, 13 December 2018 01:19
Guest — Axial cyclone separator

http://www.jcicyclonics.com

Thank you for thoroughly explain exactly what a centrifugal compressor gas seal is and what its function are.
Sunday, 27 April 2014 07:03
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