Hydraulic Institute Publishes ANSI Standard for Nozzle Loads on Centrifugal and Vertical Pumps
PARSIPPANY, NJ, August 28, 2001 - The Hydraulic Institute (HI) has published a new American National Standard for "Centrifugal and Vertical Pumps for Allowable Nozzle Loads," designated as ANSI/HI 9.6.2-2001. The Allowable Nozzle Load standard has been developed to assist pump users and systems designers in determining appropriate flange and nozzle loads. The standard will also be of particular value to anyone using pumps in chemical process applications such as those that conform to ANSI/ASME B73 standards.
"Ensuring that a pump operates within prescribed nozzle load guidelines is key to proper installation and operation. Excessive piping forces and moments can spring a pump or pull it out of alignment with the driver. Misalignment often leads to reduced bearing and seal life, increasing associated maintenance cost and downtime," explained Gregg Romanyshyn, technical director of HI. "The guidelines contained in this standard consider pump type as well as nozzle size and pump hold-down bolts."
The 34-page standard includes recommendations for allowable nozzle loads, which when specified by pump users, shall conform to the prescribed requirements for the following types of pumps:
Horizontal end suction single stage (ANSI/ASME B73.1M, B73.3M, and B73.5M)
Vertical-in-line single stage (ANSI/ASME B73.2M)
Axial split case single and two stage
End suction slurry pumps
Vertical turbine short set pumps
Comprehensive in its scope, the new ANSI/HI 9.6.2-2001 Allowable Nozzle Loads standard provides detailed information on nomenclature and definitions, criteria for loading allowances, and driver and coupling alignment. It also provides useful information on internal pump distortion, nozzle stress and pressure-temperature relationships. Nozzle load adjustment factors, alternate pump mounting techniques and specific nozzle loads for various ANSI/ASME B73 pumps are given.
The standard, designated by HI product code M119, is available from the Hydraulic Institute for $55.00. The standard is available in secure PDF format or can be ordered in hard copy from the E-Store on the HI web site: www.pumps.org. The on-line service provides virtually instant access to HI pump standards as PDF documents on a worldwide basis.
HI Pump standards are reliable, widely accepted references for anyone involved in pumps, including users, consultants, contractors, construction firms, manufacturers of pumps, seals, motors, instrumentation and controls. The complete set of HI standards includes 22 documents, over 1,200 pages in length, which are available as individual standards, as four different pump type sets, or in complete hard-copy sets. The complete set is also available in a CD-ROM format with a comprehensive index with valuable hypertext links for easy reference.
About Hydraulic Institute
The 84-year old Hydraulic Institute, the largest association of pump producers in North America, serves member companies and pump users by providing product standards and forums for the exchange of industry information. Information on the Hydraulic Institute, its services, standards, publications and meetings, can be found at the HI web site at www.pumps.org or by calling (973) 267-7772 in the U.S. or (888) 786-7744 toll-free. Requests may also be faxed to (973) 267-9055 or mailed to Hydraulic Institute, 9 Sylvan Way, Parsippany, NJ 07054-3802.
Source: Hydraulic Institute Inc.
