Double block and bleed valve applications and advantages

The term double block and bleed carries a lot of mistaken belief when it is used to explain valve work. Every valve buyer and producer seems to have a different idea of what the term means for control device selection, which can outcome in misguided specifications or the bad choice of control device type. In the gas and oil industry, some of this confusion stems from the fact there are 2 credible sources that define the term differently. Another level of confusion comes because many people using the term DBB truly want a valve with DIB capabilities. Anyway, the difference in terminologies and definitions involved are vital when it comes to determining which control device capability is required for what kind of system.click here

Advantages and applications

Both DIB and DBB valves keep area, decrease the need for costly multivalve systems and give zero leakage abilities from downstream to upstream. Such valves also permit for an integrity check for seat seals. In the gas and oil fields, both DBB and DIB can be used in a big range of markets and applications, such as petrochemical, liquefied natural gas, natural gas industrial processes, manifold and mainline valves in liquid pipelines, and refined products transmission lines.

Both DIB and DBB are used in applications for which important isolation is required to make sure that leakage does not happen. The choice for what kind depends on the type and application of service. For example, in liquid service near municipalities or waterways, twin spreading gate control devices with DBB capabilities are favored for critical isolation because they give a strong mechanical seal, downstream and upstream 

Both DIB and DBB are used in applications for which important isolation is required to make sure that leakage does not happen. The choice of what kind depends on the type and application of service. For instance, in fluid service near municipalities or waterways, twin-expanding gate valves with DBB capabilities are favored for critical  isolation because they give a strong mechanical seal, downstream and upstream simultaneously, which is generally  unaffected by force vibrations or variations.

Another application in which DIB and DBB valves are used in meter calibration. Every closed control device in meter structure must seal drop tight. Even a little leak will cause problems in the meter calibration, and the bad meter factor will continue until the next proving process. This can cost end users big sums of cash. Picking the right API-verified DIB and DBB valve can help make sure right calibration almost every time.

The automatic wedge action of a twin block and bleed plug control device compresses both the downstream and upstream seals definitely against the control device body, which denotes no support is required from the line force to shape a right seal.

Conclusion

DBB valves, which are largely used in the storage markets and transmissions, give reliable and provable zero leak of different fluids. When determining whether to use DIB and DBB valve and which definition to follow (OSHA or API), it is vital to have a perfect understanding of the differences and similarities.