PRODUCTION • PROCESSING • HANDLING
The Taurus Series valves
consist of two block ball
valves and a bleed valve
PIPELINE VALVES
The new generation of valve solutions; double block & bleed piping ball valves
variations and other weather infl uences. To ensure that the distribution of liquids and gases functions smoothly and that the medium does not escape, the technology must meet the highest quality standards. An innovative range of double block & bleed piping ball valves off ers a solution that scores with its sealing properties and at the same time ensures optimal ventilation. In pipelines, very diverse media with
P
varying properties can be transported. T e problem is that many of these media expand when heated – such as, for example, liquefi ed natural gas. If the medium cannot expand because it is trapped in a fi xed space, the pressure
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ipelines that transport oil and gas over long distances often pass through rough environments. T ey are exposed to temperature
increases instead. If the liquefi ed natural gas is spatially blocked at -161°C and 1 bar pressure and the temperature is allowed to rise to room temperature, the pressure increases to 1,895 bar. T erefore, it must be ensured that areas, in which the medium can be blocked, are protected against a pressure overload. T e decisive factor is that according to the standard, the overpressure must not escape into the atmosphere, but must be released into the process line. Both the double block & bleed piping ball valves in the Taurus Series and the “process-to- instrument” ball valves of the VariAS- Block Series meet these requirements as a standard feature. T ey consist of two block ball valves and a bleed valve (double block & bleed). Depending on the version, they can withstand pressures up to 420 bar.
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DIFFERENT STANDARDS REQUIRE DIVERSE SOLUTIONS
Among other things, AS-Schneider’s solutions are designed for the two diverging standards EEMUA 182 and SHELL MESC SPE 77/170. T e latter requires venting through a 3mm borehole in the ball in the direction of the process. T is technique is used in the VariAS- Block Series. T e ball valves are available with
fl oating ball design. T e ball seats are fi xed and the ball can move in closed position in direction of fl ow. When the valve closes, the ball also rotates and the liquid or gas enters in and around the ball. Without the 3mm borehole, the medium would be blocked between the two ball seats which would lead to a signifi cant increase in pressure when heated. T e medium can simply expand
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