Installation of double flanges
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Generally, double-flange level gauges are installed side by side. Now the question is: there must be a limit on the length of the capillary tube, right? It usually cannot exceed 6 meters or 10 meters (someone who knows this well could please confirm; I’m not entirely sure). If the height of the tank exceeds this limit, it should be possible to transfer the pressure of the gas at the top (the nitrogen seal) to a location where the double-flange capillary tube can reach, via a pressure transfer tube (which can be installed separately), or directly to the low-pressure side of the single-flange gauge. How is this usually described when selecting equipment?
According to Yokogawa EJA’s selection manual, the maximum capillary length should be 15 meters. Capillary length (m): The specified range for capillary length is from 1 to 15 meters, indicated using □□ (for example: 2m:02). If the length is 15 meters, this delay needs to be carefully considered
Just the parameters required for a normal selection are needed (medium, pressure, temperature, measurement range, measurement accuracy, etc.). Then why not use a regular differential pressure transmitter for installation? Wouldn’t it be more economical and convenient to add an isolation tank during installation?
The Rosemount double-flange capillary types are available in 15-meter lengths
This post was last edited by Qie Ting Feng Chen on September 17, 2015, at 10:52. Both Rosemount and Yokogawa specify a maximum length of 15 meters. However, there are a few points to note: first, the type of filling fluid inside the capillary affects its length; for capillaries filled with high-temperature-resistant fluids, the length is generally between 1 and 10 meters； Secondly, the structure of the connection flange also has an impact on the length; you can refer to the option documentation for EJA. As for the parameters that need to be specified for the options, they are all the same as well, including the measurement range, the physical and chemical properties of the medium being measured (such as temperature, corrosivity, etc.), the static pressure inside the tank, the accuracy of the transmitter, and the specifications of the connection flanges. I believe that the clearer the requirements are stated, the better the compatibility of the product will be.