Kierra Kiki Sheard This Is Me Zip on this page. According to API 610 10th Ed. Para 5.7.1 Radial running clearances shall be used to limit internal leakage and, where necessary, balance axial thrust. Impeller pumping vanes or close axial clearances shall not be used to balance axial thrust. Renewable wear rings shall be provided into the pump casing. Impellers shall have either integral wear surfaces or renewable wear rings. Based on this paragraph my understanding is that any pump purchased according to this specification shall have: 1.

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This article will address changes that have been incorporated into the new ISO 13709 2nd Edition - ANSI/API Standard 610 11th Edition, Centrifugal pumps for petroleum, petrochemical and natural gas industries. It will specifically discuss significant changes that will impact pump reliability as well as other key changes.

Two casing/impeller wear rings 2. It should have throttle bushing. Need your opinion. • RE: Is a throat bushing mandatory on API 610 Pumps.

API 610 does not require a throat bushing. The only purpose for a throat bushing is to control the fluid in the seal chamber either to increase pressure (for example a plan 11) or to limit interchange with the pumped fluid (for example a plan 23). Para 5.7.1 only dictates certain design features for the wear rings.

It does not dictate the number of wear rings or bushings. In certain circumstances such as high suction pressures with OH2 pumps, only one wear ring (on the impeller eye side) might be fitted to help balance axial thrust. API 682 notes the optional nature of throat bushings in 6.1.2.15 BTW, the current edition of API 610 is 11th edition. RE: Is a throat bushing mandatory on API 610 Pumps (Mechanical) 28 Sep 11 01:06. Thanks pumpkind. However, as we specify on the purchase order that the pump shall be bought according to API 610 Specification, any mandatory requirements 'the use of shall' must be followed by the winning vendor otherwise vendor shall state on their 'Exception & Deviation' during the bidding stage. In addition to, if the pump will not be furnished by replaceable wear rings, it will be more costly to change the impeller.

Thanks and hoping for additional comments. RE: Is a throat bushing mandatory on API 610 Pumps (Mechanical) 28 Sep 11 09:59. API 610 11th edition, explicitly allows open impeller designs, per 6.6.1 Previous versions of API 610 did not exclude the use of open impellers. I don't agree that 5.7.1 10th edition precludes open impellers. All that paragraph limits is the use of close axial clearances. No reputable manufacturer is going to use close axial clearances on open impellers. For example we use a minimum axial clearance of 0.030' (0.75mm) per side on our OH2, OH3 open impellers, which is well in excess of what is necessary from a thermal transient standpoint.

RE: Is a throat bushing mandatory on API 610 Pumps (Mechanical). @CaracasEC I tend to agree that maintenance cost on closed impellers will be lower. Open impeller pumps don't tend to play as well if there are any significant solids in the pumped fluid.

When wear occurs, you are replacing larger more expensive components. Please consider that the need for open impellers comes from the API 610 requirement to select a pump between 80 to 110% of BEP. For very low specific speeds, the only practical manufacturing option is an open impeller. As a manufacturer we will always offer a closed impeller where possible.

RE: Is a throat bushing mandatory on API 610 Pumps (Mechanical).