Product category:
Pressure/temperature regulators, steam traps
News Release from: Severn Glocon | Subject: Severn Glocon MLT
Edited by the Processingtalk Editorial
Team on 27 August 2004
Solving vibration problems at UK power
station
The high pressure steam leak-off system at Hartlepool power station suffered from noise and vibration problems on start-up, requiring a pressure reducing vessel with four stages of pressure let-down
The high pressure steam leak-off system at Hartlepool power station suffered from noise and vibration problems on start-up 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
This article was originally published on Processingtalk on 24 Nov 2003 at 8.00am (UK)
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However, this combination was unable to prevent cavitation when pressure drops of up to 180 bar were being experienced.
Control valve manufacturer Severn Glocon with a sizing programme indicated that at these pressures at least sixteen 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 (multi-labyrinth trim) seat technology.
The MLT trim consists of a multi-plate stack with multi-directional, 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 projects specialist Exeeco.
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