{"id":990,"date":"2021-12-07T06:06:46","date_gmt":"2021-12-07T06:06:46","guid":{"rendered":"https:\/\/bcdev.serokaindustrialbranding.com\/?page_id=990"},"modified":"2022-05-18T22:30:04","modified_gmt":"2022-05-18T22:30:04","slug":"pump-shaft-stabilizing-bushing","status":"publish","type":"page","link":"https:\/\/bouldencompany.com\/pump-shaft-stabilizing-bushing\/","title":{"rendered":"Pump Shaft Stabilizing Bushing"},"content":{"rendered":"\n[et_pb_section fb_built=”1″ theme_builder_area=”post_content” _builder_version=”4.17.3″ _module_preset=”default”][\/et_pb_section][et_pb_section fb_built=”1″ fullwidth=”on” theme_builder_area=”post_content” _builder_version=”4.17.3″ _module_preset=”default”][et_pb_fullwidth_image src=”https:\/\/bouldencompany.com\/wp-content\/uploads\/2021\/12\/boulden_defaultPages_Banner_Image.png” _builder_version=”4.17.3″ _module_preset=”default” theme_builder_area=”post_content” alt=”Content Page and Post header image” title_text=”boulden_defaultPages_Banner_Image” hover_enabled=”0″ sticky_enabled=”0″][\/et_pb_fullwidth_image][\/et_pb_section][et_pb_section fb_built=”1″ theme_builder_area=”post_content” _builder_version=”4.17.3″ _module_preset=”default”][et_pb_row _builder_version=”4.17.3″ _module_preset=”default” theme_builder_area=”post_content”][et_pb_column _builder_version=”4.17.3″ _module_preset=”default” type=”4_4″ theme_builder_area=”post_content”][et_pb_text _builder_version=”4.17.3″ _module_preset=”default” theme_builder_area=”post_content” text_font_size=”42px” hover_enabled=”0″ sticky_enabled=”0″]Pump Shaft Stabilizing Bushing<\/strong>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.17.3″ _module_preset=”default” theme_builder_area=”post_content”][et_pb_column _builder_version=”4.17.3″ _module_preset=”default” type=”4_4″ theme_builder_area=”post_content”][et_pb_text _builder_version=”4.17.3″ _module_preset=”default” theme_builder_area=”post_content” hover_enabled=”0″ sticky_enabled=”0″]

Boulden supplies non-metallic composite materials like\u00a0Vespel\u00ae CR-6100<\/a>\u00a0and\u00a0Boulden B-Series<\/a> which can be used to fabricate pump shaft stabilizing bushings. Our materials are dimensionally stable, non-galling, non-seizing, easily machined, and very durable<\/p>\n

Why do you need to stabilize the pump shaft?<\/h2>\nOne of the main causes of mechanical seal or packing failure is excessive pump shaft deflection. Pump shaft deflection creates uneven loads at the sealing areas, premature wear, and reduced component life. Excessive pump shaft deflection can also result in high vibration which reduces bearing life. In extreme cases, excessive shaft deflection can even cause pump shaft failure.\n

Why does a centrifugal pump suffer from excessive shaft deflection?<\/h2>\nThere are two primary reasons for excessive pump shaft deflection. The first is the pump design. Many pump designs incorporate long, thin shafts. The shaft stiffness ratio, or L\/D ratio, provides an indication of the flexibility of the pump shaft. A simple way to think of it is that the longer and thinner the pump shaft, the more susceptible it is to excessive pump shaft deflection. The second cause of shaft deflection is operational. Centrifugal pumps generate radial forces during operation. These forces are related to the flow rate. When a pump is operating near its BEP (best efficiency point) the radial force is at its minimum level. As the pump operates further away from BEP, these forces increase. To simplify this aspect, low flow operation creates high radial forces which can cause excessive shaft deflection.\n

The Shaft Stabilizing Bushing Solution<\/h2>\nA common method of addressing pump shaft deflection is to install a pump shaft stabilizing bushing in the bottom of the pump stuffing box or mechanical seal chamber in place of the original\u00a0throat bushing<\/a>. The idea is to install a longer throat bushing with reduced clearance to reduce shaft deflection at the mechanical seal or packing.\n

Design Considerations:<\/h3>\n