AxiSeal BL621 Inflatable Stand-by Propeller Shaft Seals Ø35–60 mm

AxiSeal BL621 Inflatable Stand-by Propeller Shaft Seals Ø35–60 mm

AxiSeal BL621 Inflatable Stand-by Propeller Shaft Seals are auxiliary sealing devices designed for use with AxiSeal mechanical shaft sealing systems. The stand-by seal provides temporary watertight sealing when maintenance, disassembly or replacement of components in the main AxiSeal assembly is required.

The BL621 range includes three configurations for propeller shaft diameters of 35–45 mm, 50 mm and 60 mm.

Auxiliary Sealing for AxiSeal Systems

The stand-by seal is designed to work alongside the main AxiSeal mechanical propeller shaft seal.

Unlike the primary AxiSeal assembly, which uses rotating and stationary sliding rings, the stand-by seal provides a temporary sealing function during maintenance.

Inflatable Rubber Sealing Element

The stand-by sealing system incorporates an inflatable rubber element.

When inflated using an air pump, the rubber element creates a temporary watertight seal around the propeller shaft.

Installation Position

The stand-by seal can be installed between the propeller shaft flange and the main AxiSeal assembly.

This arrangement provides an additional sealing function that can be activated when work on the main shaft seal is necessary.

Maintenance While Afloat

When the stand-by seal is activated, it allows the main AxiSeal to be dismantled and damaged components to be replaced while the vessel remains afloat.

This provides a maintenance solution for installations equipped with the corresponding AxiSeal system and stand-by sealing arrangement.

Available Models and Shaft Diameters

The following table lists all three AxiSeal BL621 configurations according to the supplied catalogue.

Key Features

• Product: AxiSeal® Stand-by Seal.
• Series: BL621.
• Product Type: Auxiliary Inflatable Propeller Shaft Seal.
• Application: Temporary Watertight Sealing During AxiSeal Maintenance.
• Sealing Element: Inflatable Rubber.
• Activation: Inflation Using an Air Pump.
• Installation: Between Shaft Flange and Main AxiSeal.
• Maintenance Application: Servicing the Main Seal While the Vessel Remains Afloat.
• Available Shaft Sizes: 35–45 / 50 / 60 mm.
• Available Configurations: 3.

Technical Specifications

Stand-by Seal Selection

Select the appropriate AxiSeal BL621 stand-by seal according to the propeller shaft diameter:

• BL621-035: For shaft diameters from 35 to 45 mm.
• BL621-050: For 50 mm shafts.
• BL621-060: For 60 mm shafts.

The BL621 stand-by seal is an auxiliary component for the AxiSeal sealing system and is intended to provide temporary sealing during maintenance of the primary seal.