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.

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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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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No Detail or Procedure is Trivial, or, Sophisticated Vibration Analysis is a VERY Cost Effective Diagnostic Tool

No Detail or Procedure is Trivial, or, Sophisticated Vibration Analysis is a VERY Cost Effective Diagnostic Tool
Today it is common practice in overhauls of large rotating equipment to spend many man hours in detailed planning, coordination, writing procedures, reviewing documentation, reviewing past photos, procuring and inspecting spare parts etc. We also review our past experience and put steps in place to mitigate past problems or errors.   Now that we have a detailed plan, have purchased and inspected all necessary spare parts and have mitigated all potential known problems we simply give the plan to the machinery contractor to execute, right? If you have been responsible for large machinery repairs long enough, you have definitely learned to say one thing: “I have not seen everything,” and never to say another “Oh that could never happen here.” No matter how thorough we think our plan is, going in, missing even the slightest detail in the field can result in a failed start up or worse. Experienced oversight is essential...
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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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Machinery Hurricane Flood Damage– Innovative Seal Recovery Procedure

Serious floods rarely occur in the life of a refinery or petro-chemical plant. But when such an event does occur there are significant implications for the reliability of rotating equipment and associated business risks when it's time to restart the plant. And because this scenario is so uncommon, there are few, if any, industry standards offering guidance or practical advice on the methods appropriate to ensure a cost effective and reliable restart of the facility. Two Becht Machinery Advisors, Stanley Fussell and Randy Passman, developed an industry-unique and innovative procedure for flushing and testing oil film and gas seals that allowed a client to successfully restart over two dozen major machinery trains following a serious flood, without having to replace a single seal system. The experience involved the serious flooding of a large chemical plant due to hurricane surge. The entire plant was submerged in up to ten feet of salt...
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