Injection/sampling DBB valve with support collar and significance of the wake frequency calculation скачать в хорошем качестве

Injection/sampling DBB valve with support collar and significance of the wake frequency calculation

Learn more about injection and sampling DBB valves with support collar and the significance of the wake frequency calculation in our explainer video. You can find more valuable information on the topic of injection/sampling DBB valves, support collar applications or the wake frequency calculation in our blog. In our blog, we regularly keep you up to date with technical articles on numerous key topics related to injection/sampling DBB valves and their application areas. Our hint for you: Subscribe to our newsletter today so that you will never miss a new blog article on the topic of injection/sampling DBB valves and their application areas: ▬▬▬▬ ★ AS-Schneider Blog ★: ⇨ https://www.as-schneider.blog/ ▬▬▬▬ The use of injection or sampling DBB valves with or without a support collar is a common application in the process industry like oil & gas, chemical or petrochemical industry. But injection or sampling applications can also be very tricky. This is because an object inserted into a pipeline can prove disastrous if it is not properly designed. In the case of a sampling or injection probe, the vibration generated by the flow can cause the probe to vibrate so strongly that it breaks. But first, let's explain the difference between an injection application and a sampling application. As the name suggest, injection is used when adding additives into the media in the pipeline, to produce a product according to end user specification. As for sampling, purpose is to draw media out from a pipeline, and this media will be use as sample, that will be sent to a lab, to check if the sample drawn from this sector is within the product parameters. WAKE FREQUENCY CALCULATION Well, considering that an object inserted into the pipeline can prove disastrous if not properly designed, the calculation of the wake frequency becomes an important factor in the design of an injection or sampling DBB valve. Thereby, following rule of thumb applies for the length of the parts to be inserted into the pipeline: 1. Injection probe needs to be inserted to the center of the pipeline. 2. Sampling probe needs to be inserted to 1/3 of the pipeline diameter. So how does the wake frequency calculation work in practice? Let`s check an example. 1. An injection DBB Valve with probe must be inserted ½ way into a 400 mm diameter pipeline. 2. To achieve that the probe tip is in the middle of the pipeline at 200 mm, the probe length must be 350 mm. 3. This overall length is considered as the "unsupported length". 4. After the wake frequency calculation, the result shows that the maximum unsupported length is 300 mm instead of required 350 mm. 5. In this case, a support collar must be inserted to achieve the length require by the end user. Well, let's see how the wake frequency calculation looks like using a support collar. 1. A support collar is set at 50 mm away from the flange of the DBB valve. 2. This portion is now considered as the “supported length”. 3. The portion below with of 300 mm is considered as the “unsupported length”. 4. The calculation starts from support collar onwards to the end of the probe. 5. Having a “unsupported length” of probe at 300 mm, it is now within the recommendation for the wake frequency. 6. And the overall length of the probe of 350 mm can be used as required. STANDARD ASME PTC 19.3TW According to the standard ASME PTC 19.3TW, which focuses more on thermowells but can also be applied to injection or sampling DBB valves with probe, support collars or other support are outside the scope of this standard and should only be used in consideration of the individual application parameters. Based on this, process engineers should better consider following options, which could be better ways to prevent failures: 1. Reducing the immersion probe length into the pipeline. 2. Reducing the height of flangeolet to reduce overall “unsupported length” of probe. 3. Achieving maximum probe diameter of injection or sampling DBB valves. There you have the most relevant facts about injection and sampling DBB valves and the influence of the wake frequency calculation on the use of a support collar. #injectiondbbvalve #samplingdbbvalve #wakefrequencycalculation #supportcollar