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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.

Correcting Splitline Leaks on Dresser-Rand M-Line Compressors

Correcting Splitline Leaks on Dresser-Rand M-Line Compressors
Two compressors at a Refinery in Texas were up-rated to bushing type dry gas seals to eliminate the historical H2S leakage to the environment. The existing seals in both of these machines were the original Clark floating bushing oil seals. There were concerns that the leakage path may be around the outside of the seals at the splitline and not axially through the seals. To assure that the gas seal upgrade was addressing the root cause of the leakage, testing was performed to determine if the case could be leaking around the seals at the splitline. The information below illustrates in detail the tests performed, the results of the test, and the subsequent modifications made to the compressors to reduce the potential for case splitline leakage. Both Compressors were removed from the Refinery and repaired at the Dresser-Rand (D-R) repair facility in Houston, Texas. Both machines were dissembled and inspected to...
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7278 Hits
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Demister Pads—A simple device until they don’t work

Demister Pads—A simple device until they don’t work
A demister pad is similar to an air filter except instead of removing dust particles from a stream of air for example, it removes micron-size liquid particles from a liquid/vapor stream often found in many industrial processes. An air filter prevents dust particles from entering downstream equipment; similarly a demister prevents liquid droplets from entering downstream equipment where they may affect operation or cause damage. In general, a duty specification is prepared by the process designer and given to demister vendors to recommend a demister that meets the duty requirements. Or today, knowing the required duty you can select a demister from the vendor's online catalog. The demister is installed, performs as intended and is never heard about again. On occasion, problems arise as the case in which Bob Fiocco, a Becht Sr. Advisor, provided technical support to a refining client on demister design and selection. An existing demister installed in...
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16630 Hits
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New ASME PCC-1 Qualification Procedures for Flange Joint Assemblers

For quite some time now, Section VIII Division 1 of the ASME Boiler & Pressure Vessel Code has included the following provision in Appendix 2-15: 2-15 QUALIFICATION OF ASSEMBLY PROCEDURES AND ASSEMBLERS. It is recommended that flange joints designed to this Appendix be assembled by qualified procedures and by qualified assemblers. ASME PCC-1 may be used as a guide. The "qualified procedures" reference is to Appendix A of PCC-1-2010 entitled "Notes Regarding Qualifying Flanged Joint Assemblers" and these notes cover slightly less than ½ page, with an Introductory Note stating that a proposed revision to this Appendix was under consideration by the ASME Pressure Technology Post Construction Committee. Well this "consideration" has come to fruition so that the updated Appendix A in the 2013 Edition of PCC-1 will include a replacement 20+ page Appendix A entitled: TRAINING AND QUALIFICATION OF BOLTED JOINT ASSEMBLY PERSONNEL. QUALIFICATION COMPONENTS There are three components outlined...
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12234 Hits
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Pressure Vessel Fitness for Service

Pressure Vessel Fitness for Service
A major oil company revitalizing an Iraqi oil field called on Becht Engineering to review several hundred pressure vessels containing thinned regions to determine their fitness for service (FFS) per the API-579-1/ASME-FFS-1 Part 5 process for analyzing Local Thin Areas (LTAs). Using ultrasonic testing (UT) and visual inspection data, Becht Engineering customized its proprietary API-579-1/ASME-FFS-1 compliant General Metal Loss and Local Thin Area evaluation software to create a program capable of evaluating the maximum allowable working pressure (MAWP) of these pressure vessels in an efficient manner. The software  is very easy to use and presents the results in a user-friendly format for evaluation by engineers and managers. Because of the extensive nature of the corrosion, large files containing UT scan data needed to be evaluated, and the software was enhanced to parse and analyze the LTAs in the large datasets. This highly efficient process allows rapid evaluation of LTAs, and most...
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3912 Hits
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