A remarkable thing happens when a good and industry-compliant design becomes tangible. Operators feel safe and comfortable with it right away. The reliance level is so high that the risks—surrounding the area—come to be afterthoughts. That is until an urgent and dangerous situation arises. In a trice, teams and crews are back to reality. A state of constant awareness takes over.
What to do under those trying circumstances?
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Block and Bleed and Double Block & Bleed isolation systems are used in process instrumentation to isolate your instrument from the main process line. The isolation valve(s) stop the flow from the upstream, while the bleed valve removes any pressure or residual product that remains in the downstream section or in the section between the two valves.
Use of block and bleed valves is mandatory in many industrial processes for isolating the measuring instrument from the process line. This allows maintenance work to be performed on the instrumentation without the need to shut down the entire operation. There are two approaches to the installation of a block and bleed or a double block and bleed setup.
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My previous article in this series explained what are the main issues in obtaining a representative sample in NG applications.
This case study demonstrates a reliable sampling solution currently used by plant operators. It helps plant operators to obtain representative samples.
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In this article, I present the major issues associated with obtaining a representative sample in NG applications. The article explains what is representative sampling, and why sampling is important in the natural gas industry. I discuss factors that determine what should be a suitable sampling frequency in a process, and which sampling standards can be followed to ensure representative sampling.
Several major issues in obtaining a representative sample, and common design flaws that lead to poor sampling are presented and discussed. In addition, I present how a suitable probe length can be determined and how the probe should be installed. The different types of commonly used sampling probes are also compared and discussed.
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Case study about high temperature Double Block & Bleed valves for steam injection. We have successfully installed the DBB valves at the Amal oilfield in Oman which uses “green” steam, generated at the Miraah solar thermal facility.
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We are all facing many restrictions due to the pandemic. Therefore, we need to find ways to still provide the best possible support to our customers. One digital service that our customers can use is our third party inspections – better said remote inspections.
Our customers can use the remote visual inspection to check the valve quality before shipping.
I have now been in the field for more than 25 years and support my customers exclusively in Germany. I have noticed that the measurement technology in the plants is carried out very differently. Just as there are endless variants of Tapas, there are also many different types of measurement technology. As a passionate Tapas connoisseur and with over 30 years of professional experience, I know both areas very well.
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In times of budget cuts and lack of skilled workers, it is all the more important to use the right product solutions in your plant. In my current article I would like to explain the advantages of a close-coupled installation in the area of one of our products, “monoflanges”. That can have a very positive effect on your maintenance and operating work.
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To support users in their proper planning and technical evaluation, I would like to share some information about one less-familiar product in the industry, the chemical injection quill.
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I remember very well when we started the development of our Double Block & Bleed Valve Series. We called it “VariAS-Blocks”. Production started 20 years ago, and we have made many improvements since there.
We based the design on the standard SHELL MESC SPE 77/165 (which the MESC SPE 77/170 superseded) and EEMUA 182.
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