{"id":552,"date":"2019-07-22T04:00:52","date_gmt":"2019-07-22T02:00:52","guid":{"rendered":"https:\/\/www.as-schneider.blog\/?p=552"},"modified":"2020-10-06T11:33:09","modified_gmt":"2020-10-06T09:33:09","slug":"dbb-system-in-instrument-piping-a-cost-effective-safety-solution","status":"publish","type":"post","link":"https:\/\/as-schneider.blog\/2019\/07\/22\/dbb-system-in-instrument-piping-a-cost-effective-safety-solution\/","title":{"rendered":"DBB system in instrument piping \u2013 a cost effective safety solution"},"content":{"rendered":"\t\t
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DBB system in instrument piping \u2013 a cost effective safety solution<\/h1>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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I remember very well when we started the development of our Double Block & Bleed Valve Series. We called it \u201cVariAS-Blocks\u201d. Production started 20 years ago, and we have made many improvements since there.<\/p>

We based the design on the standard SHELL MESC SPE 77\/165 (which the MESC SPE 77\/170 superseded) and EEMUA 182.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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MESC SPE 77\/170<\/b>
\u201cProcess-to-Instrument Valves\u201d

EEMUA 182<\/b>
\u201cSpecification for integral block and bleed valve manifolds for direct connection to pipework.\u201d<\/p><\/div>\t\t\t\t\t\t\t\t\t

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As the title of these specifications implies, we mount these valves to the pipework. Thus, at least the first block valve coming from the process side must have robust process design.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Process valves and instrument valves<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Different requirements<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Let`s have a look at the difference between the requirements for process valves and instrument valves: It is sometimes a challenge to understand the different requirements for instrumentation valves. The same goes for process valves. The potential hazard of pressure equipment depends on different parameters. These parameters include the function, the medium, and the pressure-volume-product.<\/p>

You can imagine that a small instrumentation valve is not as dangerous as a big process valve. Same for the pressure: A valve for 10 bar pressure is not as dangerous as a valve for 700 bars.<\/p>

Hence the definition put forth by the European Pressure Equipment Directive. They define the requirements for valves up to DN25 as \u201csound engineering practice.\u201d<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Instrument DBB ball valve<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Cost-saving DBB ball valve for instrument piping<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Based on the first-rate experience of our VariAS-Blocks, we developed a DBB ball valve for instrument piping. The main goal was to have a cost-effective solution due to lower requirements for instrumentation. There\u2019s also no need for an integral robust primary isolation valve. The result was our BA Series DBB ball valve. This valve has a very compact design. It\u2019s lighter and takes up less space. It also boasts high-quality components for reliability and safety.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Advantage of a Instrument DBB ball valve<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Double Block & Bleed valve systems are conventional installations that most End Users in the Oil and Gas industry use. Conventional installations of DBB valve systems have become a regular practice. You can even find them on offshore platforms. As a conventional installation, you connect the DBB system using 3 single valves and a bleed valve between two isolation valves.<\/p>

It\u2019s better to use the BA Series instead, as \u00a0one single valve incorporates the 3 valves in one body.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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The advantage is obvious:<\/h5>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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