ANSI HI 9.6.4 PDF

ANSI/HI Rotodynamic Pumps for Vibration Measurements and Allowable Values. New in this Standard: Recommended default initial field alarm and trip settings are now referenced in ANSI/HI Rotodynamic Pumps – Guideline for. Hydraulic Institute Standards: ANSI/HI Covers Horizontal and Vertical. Centrifugal Pumps. Recommends use of RMS velocity.

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About the Author RP news wires. A really stiff mounting would have to bypass the volute. The HI method enables pump users and designers to estimate performance of a particular rotodynamic pump absi liquids of known viscosity, given the performance on water. One of the cookies we use is essential for parts of the site to operate properly. We use cookies to understand how you use our site and to improve your experience.

Without the use of FEA, most modifications do not resolve the issue the first time around, or worse, other natural frequencies are brought into the operating speed range. Modifications made to fix the vibration problem.

Circulation Water Pumps Exceed ANSI HI Vibration Limit – Mechanical Solutions

The Architecture, Engineering and Construction AEC industry is constantly looking for process improvements to better manage potential project delays and costs. Metric units are now primary, with US customary units secondary. Some amount of bracing or stiffening should help.

In this case, the FEA suggested that cutting the existing ribs at key locations would do the trick, and it did. Medium-Sized Gear Machining Company. Fordelene med et abonnement:. Toggle navigation Toggle search. Forside Nettbutikk Produktkatalogen Produktpresentasjon.

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NOK 1 ,00 eks. Tuned absorbers and slight stiffness re-tuning can work slick, but only for single speed pumps. Click on image to animate. In this mode, the anis structure is tilting in one direction, while the below-ground structure tilts in the opposite direction, or out-of-phase, as a nearly rigid body.

HI publishes rotodynamic pumps for vibration standard

Click Here to join Eng-Tips and talk with other members! Site designed by newmedia. Right away the numbers don’t jive real well. This standard is based on experiences from pump users and manufacturers as well as vibration measurements by many companies. For more hii about the Hydraulic Institute, its member companies and Standards Partners, visit www.

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HI publishes rotodynamic pumps for vibration standard

An engineering, procurement and construction firm needed help in determining the root cause for the high vibration amplitude of two recently installed circulation water pumps and to provide a solution to mitigate this issue.

The Next Generation of Vibration Techniques.

Finite element analysis plot of resulting mode shape after modification. Chart showing amplification factor of the natural frequency. I’d say 1X and blade pass are likely to be what give you trouble aplenty. Thank you for helping keep Eng-Tips Forums free from inappropriate posts. For speeds above rpm, the measurement quantity to be used for measuring the vibration of nonrotating parts of rotodynamic pumps is velocity in millimeters per second RMS or inches per second RMS.

The largest combined-cycle natural gas-fired power facility in Canada was measuring excessive vibration on two single stage circulation water pumps CWP. Students Click Here Join Us! I’d be interested in how many anai vertical pump installations the consultant has worked on, and how the acceptance process went. It pertains to evaluation of vibration when the vibration measurements are made on nonrotating parts bearing housing vibration.

MSI was called to conduct specialized vibration testing on the pumps system and help avoid dealing with future problems. It describes the effects of operating a rotodynamic pump at rates of flow that are greater or less than the rate of flow at the pump’s best efficiency point BEP. The allowable vibration requirements have been updated to reflect acceptable performance both for field and factory tests, based on hundreds of data points obtained in surveys conducted since the publication of the previous edition.

Finite element model mesh. Few production environments have the luxury of ordering new equipment to replace existing machines on their shop floor. Additional requirements have been added for operational speeds rpm and lower. To assist the user of the standard the following are provided as appendices: It covers the vibration measurement and allowable vibration limits.

Lubricant Storage and Handling. The vibration measurement is to be taken at the top motor bearing. Currently Seeking Members View in eStore.