PRODUCTION • PROCESSING • HANDLING
DOUBLE VISION I
Stefan Penno reveals how a double layer rupture disc design solves safety and control challenges
ssues of safety and control are frequently on the agenda within the oil and gas industry, particularly in challenging times such as these. One of the most interesting products in this field is an innovative double layer rupture disc. Te KUB V rupture disc from Rembe improves
The smart design means that maintenance can be performed while the disc is in situ
on ordinary single layer designs by eliminating the disadvantages common to many reverse acting rupture discs. Tese traditionally designed discs often exhibit premature failure because of fatigue, pre-weakening of the disc’s dome as the result of scoring of the fragile burst membrane, and even installation difficulties caused by the sensitivity of some single layer disks to torque levels. Te KUB V solves the conundrums of the single disc design by the addition of a vital feature, a specially reinforced second protection layer capable of withstanding twice the pressure in reverse direction as it does in the venting direction. Te disc’s first layer handles the burst
pressure by incorporating buckling pin elements added to the dome by high- precision laser cutting. Te second layer acts as a sealing membrane that isolates the first layer from the harsh process conditions found in the offshore, chemical, food, pharmaceutical and other process industries.
THE TECHNICAL ADVANTAGE
Tis general description of the rupture disc doesn’t do full justice to a number of technical features developed
by Rembe’s engineers. Te KUB disc has a burst layer eight times thicker than scored designs and the buckling pin formula and the number and shape of buckling pins precisely determine the burst pressure, which is independent of the material thickness. In essence, the burst layer is completely
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The KUB V rupture disc has a burst layer eight times thicker than scored designs
unaffected by the reverse force when put under backpressure. Only the sealing layer, which protects the burst membrane under normal process conditions, holds the backpressure and is subject to negative pressure.
Te design makes it possible to stretch maintenance intervals and eliminate downtime. Te disc’s so-called VIP-feature (Valve Inspection in Place), allows operators to check their safety valves without having to shut down the process, and then dismantle the valve and bring it to the workshop. In-situ maintenance with the KUB V saves both time and money.
ADDITIONAL FEATURE Rembe can also supply a Volution unit, a ready- to-use device fitted between the rupture disc and the valve that can link up with an operator’s in-house air-pressure system. By putting the space between the rupture disc and valve slowly under pressure, users can monitor the performance of safety valve easily and quickly with nothing more than a pressure gauge. Tis feature alone reduces maintenance times from hours to minutes. l
For more information ✔ at
www.engineerlive.com/iog
Stefan Penno is managing director of Rembe.
www.rembe.de
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