PRODUCTION • PROCESSING • HANDLING
high strength and corrosion resistance. However, 317L is not dimensionally stable when pressurised at high temperatures, allowing wear ring clearances and other toleranced dimensions to become distorted. An experienced pump manufacturer can resolve
this shortcoming by implementing a dimensional stabilising heat treatment process on 317L casings and pump case covers that are destined for high temperature service. Close cooperation between the refinery, the engineering procurement construction (EPC) provider and the pump supplier is essential to establish the most effective design of coker charge pump.
Te coke that remains in the drum is periodically
removed and during this process the feed material is directed to another drum. Once the coke has been steamed and cooled, high pressure water jets are used to loosen it and wash it out of the bottom of the drum. Jet cutting pumps are high pressure units, around 4,300 psi (300 bar) with a flow rate typically 150m3 hr to 300m3
/hr and therefore require multi-stage,
barrel type diffuser design, API 610 type BB5. All the impellers are stacked in a row and the axial thrust is balanced by a large diameter balance drum. Te water that is used to remove the coke is
filtered and recycled back to the jet cutting pump. Tis means it is possible for some coke particles to pass through the pump, causing accelerated wear, especially on the balance drum, which can dramatically affect efficiency and axial thrust.
REMEDIAL ACTIONS One of the primary indicators of balance drum wear is the temperature of the thrust bearing; a reading over 115°C indicates that action is required and that coke cutting efficiency has been reduced. Maintenance can be needed every few months. However, this interval can be significantly extended by working with an expert in specialised coatings. By installing hard-facing coatings in high velocity
areas, it is possible to extend this maintenance period to years, rather than months. But the process of preparing the base material and applying these coatings requires considerable expertise and knowledge of materials science. A specialised coating enhances the performance of a component, but each one is different and the processes to apply them vary as well. Only through years of experience and expertise in the metallurgical properties, the application technology and quality control procedures, can a reliable and durable protective system be realised.
Scott Graham is gobal product portfolio manager - Oil & Gas for Sulzer.
www.sulzer.com
WHAT CAN ENSURE MY PLANT‘S LONG-TERM EFFICIENCY?
/
EXPERIENCE!
The know-how of more than 60 years empowers Böhmer to build Ball Valves that help customers to realize their projects effi ciently & successfully for the long term.
1/8 TO 56 INCH
OIL, GAS, STEAM, CHEMICALS & SPECIAL APPLICATIONS
UP TO 800 BAR
www.boehmer.de www.engineerlive.com 31
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