Type 8628VL

Increased Reliability: With tests indicating an extended MTBR of up to 48 months and beyond, John Crane’s Type 8628VL is designed to increase equipment uptime, supporting uninterrupted pipeline operation.

Technical Competitive Difference

Non-contacting mechanical seals can operate continuously for nearly twice as long as a mechanical seal with a liquid barrier fluid.

Conventional mechanical seals operate with face contact and are lubricated by process liquid. These process lubricated seals are not capable of operating fully lubricated where phase change occurs.

The Type 8628VL is designed to operate as a fully non- contacting seal, removing both these operating challenges. Test results indicate an extended MTBR of up to 48 months and beyond.

Technical Design

We have applied our expertise in Dry Gas Seal technology to engineer the Type 8628VL mechanical seal, designed specifically for ethane and ethylene pipeline operators.

The Type 8628VL spiral grooved seal faces operate fully lubricated in the liquid, supercritical and vapour phases of ethene and ethylene without face contact.

Tests indicate an extended MTBR of up to 48 months and beyond.

Increased Efficiency –Less Flush Fluid & Less Energy

The 8628VL is designed to use up to 10 x less flush fluid.

It can significantly reduce parasitic horsepower losses compared to traditional full face contacting technology.

Face contacting seals configured as tandem seals depend upon liquid phase process fluid (ethane or ethylene) for inboard seal face lubrication and cooling, often 15 to 30 GPM of filtered flush flow for cooling of the faces. The Type 8628VL requires only 2 to 3 GPM flush fluid flow for operation.

Less Energy

John Crane’s Type 8628VL is designed to maintain seal face lubrication, eliminate face friction and reduce energy consumption for your pump.

Shorter servicing time

Unlike conventional mechanical seals used for ethane and ethylene pipelines, John Crane's Type 8628VL is serviceable via our local service centres. We maintain critical inventory elements and rebuild-ready hardware designs which should shorten lead times compared to conventional mechanical seal refurbishments.