How is leakage minimized during a complete seal failure on the Type 3 fueling pump mechanical seal?

In a Type 3 fueling pump with a mechanical seal, a complete seal failure can occur, but measures are in place to minimize leakage even in such scenarios. The non-sparking throttle bushing plays a crucial role in containment and preventing excessive leakage of fuel.

This component serves to create a barrier that reduces the flow of fluid past the seal surfaces when a failure occurs. Its non-sparking properties also enhance safety by preventing ignition sources in an operational environment where flammable fuels are being handled. The throttle bushing effectively acts as a secondary sealing mechanism, which helps to maintain pressure and reduce the amount of fuel that can escape during a complete seal failure.

While o-rings, Teflon packing, and end plate seal glands are indeed important components in sealing systems, they do not serve the same function as the non-sparking throttle bushing in terms of managing a complete seal failure.