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ANSI/API STANDARD ELEVENTH EDITION API publications necessarily address problems of a general nature. With respect to. PumpWorks exclusively manufactures current edition API / ISO centrifugal pumps. PumpWorks offers Current Edition: l API single stage . API STANDARD /ISO Key. 1 inlet valve. 2 gland. 3 bearing housing. 4 exit valve. Figure B.2 Piping for overhung pumps Plan A, cooling to.

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API Standard Centrifugal Pumps for Petroleum, Petrochemical and Natural Gas. Industries. ISO (Identical), Centrifugal pumps for petroleum. ANSI/API Standard Tenth Edition, October ISO , (Identical ) Centrifugal pumps for petroleum, petrochemical and natural gas industries. I/06 Background: The second paragraph of mentions: " Setting the limits for the preferred operating region and location of.

Updates to global specifications address pump reliability and much more F. Korkowski, Flowserve, Vernon, California; R. Jones, Consultant, Houston, Texas; and J. The shaft flexibility index was developed as a straightforward tool to evaluate a true API pump design vs.

Before reviewing these changes, it is important that is purportedly labeled API but does not meet the standards to understand the background surrounding this new API edi- design requirements.

API documents are routinely updated every five years. This illustration charts smaller the 10th edition in October The guideline ing Group began updating efforts on the 11th edition in Collaboration with other industry groups such as the represents modern design overhung pumps. Some of the overhung Hydraulic Institute, International Electrotechnical Commission designs reviewed in constructing Fig.

During this timeframe, engineers typically choose to make purchases that embrace a new editions changes, especially those affecting equipment reliability. D Changes addressing reliability.

For the new API 11th Edition, there are three significant changes with potential impact on pump reliability. Old vs. Results from this formula show that system life is shorter than D the shortest life of the individual bearings in a system.

Traditionally, API 1 has had various requirements that build a safety factor into selection of the bearings. It is also a fact that these requirements be derived from the largest set of hydraulics for each bearing housing size. This means that, for all or most other hydraulics, API pump designs should automatically exceed the bearing life requirements.

This positively impacts API pump manu- facturers who should not have to change their designs. Appendix K in these more extreme applications. Changing bearing type or size, Figure K. So, in fied bulleted item in API. In this sampling, the mean Torsional analysis. Values derived by dividing run time by number of repairs. The three types of analysis are: on MTBR performance.

Life consider- c Transient torsional. For decades API has required each individual bearing to Other key changes. Key changes to address include: be designed for a life of 25, hours i.

Net positive suction head required operation at rated flow and 16, hours at maximum radial NPSHR has been replaced with NPSH3net positive suction and axial loads, typically minimum continuous stable flow. In rotating shaft applications, a flexible coupling can protect the driving and driven shaft components such as bearings from the harmful effects of conditions such as misaligned shafts, vibration, shock loads, and thermal expansion of the shafts or other components.

Rigid couplings are designed for heavy loads or industrial equipment. They consist of short sleeves surrounded by a perpendicular flange. One coupling is placed on each shaft so the two flanges line up face to face.

A series of screws or bolts then hold the flanges together.

Preview of API 610 12th Edition

Because of their size and durability, flanged units can be used to bring shafts into alignment before they are joined together. Therefore, no separate bearing assembly is needed and all forces are taken care of by the bearings in the motor.

This type of construction is practical to do to dispense with the alignment problem. The driver is usually mounted on a support integral to the pump.

EDI was expected to save significant effort in accurately

The impeller is mounted directly to the gearbox output shaft. In this edition, the sub-team was tasked with also looking for sections that were illogically organized. These would be reorganized for improved reading in the Twelfth Edition. If the schedule is met, the standard should be published very close to the target five-year interval between new editions. Historically, the revision process has often been very slow.

It is believed that API has never been reaffirmed. Within the API process, reaffirmation grants a two-year delay before the next publication is due.

Yet, the interval between editions is still average. Table 1 provides some interesting historical data on the various API Editions. If the standard requires updating to conform with current technology and market practices; or If the standard can be reaffirmed Presuming the decision is to revise the standard, the task force proceeds to determine how best to do the updating work, makes committee assignments, and recommends proposed changes.

All changes must meet with task force approval before they are included in the first draft of the revised standard. In the review process, the task force must consider all standard paragraphs that are pertinent to the standard and either: 1. Change the standard to agree with the standard paragraph; or 2. Modify the standard paragraph to better suit the standard being reviewed; or 3. Justify that the standard paragraph does not apply to the equipment for which the standard being reviewed applies and remove it When the task force is satisfied that the revised standard is ready to be presented to the Subcommittee on Mechanical Equipment SOME , the presentation is scheduled.

The Subcommittee may request changes be made to the draft or that the task force revisit certain subjects and present them again. All negative ballots must be resolved before the revised standard can be published.

This process usually takes between two and three years, depending on the magnitude of the changes. Engineering contractors, end users and pump manufacturers alike comprised an international team to explore, discuss and debate a variety of topics. API standards are on a five-year review cycle.

Though eventually there is expected to be more than changes which include minor edits, the key additional or modified items recommended for the Twelfth Edition inclusion are as follows: 1.

Addition of shaft guards for all pumps New Informative Annex addressing high-energy pumps 3. Material Columns reduction and improvements to material designations, including non-metallics 4. Updated Annexes for Material class selection guidelines and Material columns 5.Distinction has been 2.

This is avoided by use of o-rings on this joint. In fact since this is a metal to metal joint it is possible fabrication issues that a lap joint would not be necessary. The situation is better if tubing is allowed but many user companies do not allow tubing on these relatively low pressure product lines while at the same time allowing tubing in psig hydrogen systems for instrument sensing lines.

Preview of API 610 12th Edition

O-rings shall be selected and their application limited as specified in ISO In this edition, the sub-team was tasked with also looking for sections that were illogically organized. Allowing either form of leakage is not responsible in todays environmentally sensitive world.

Performance test points modification 7.

The as new screwed joint may or may not have detectible leakage. Results from this formula show that system life is shorter than D the shortest life of the individual bearings in a system.

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