Valves cut out cavitation problems
A
Severn Glocon product story
Edited by the Engineeringtalk editorial team
Aug 24, 2004
The introduction of the MLT valves in the high-pressure steam leak-off system at Hartlepool power station has solved a long-running problem with noise and vibration at startup.
The high-pressure steam leak-off system at Hartlepool power station was suffering from noise and vibration problems on startup.
The original design on each circuit consisted of a parallel slide valve and a pressure reducing vessel with typically four stages of pressure let-down.
However, this combination was unable to prevent cavitation when pressure drops of up to 180bar were being experienced.
Control valve manufacturer Severn Glocon's sizing programme indicated that at these pressures at least 16 let-down stages were necessary to prevent the liquid cavitation and consequential noise and damage.
The recommended solution was to install a valve incorporating Severn Glocon MLT (multilabyrinth trim) seat technology.
The MLT trim consists of a multiplate stack with multidirectional, right-angle flow turns, enabling the velocity to be dramatically reduced but preventing the liquid from reducing to below the vapour pressure and forming cavitation bubbles.
The introduction of the MLT valves at Hartlepool has solved the problems experienced and eliminated the need for pressure reducing vessels, providing simplified pipework and reduced capital costs.
Installation and commissioning of the new valves, complete with new electric actuators, was performed by power station project specialist Exeeco.
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