A T-Piece must be installed at the bend in the impulse line before it goes down to the transmitter for the purpose of filling. The distance of the impulse line from the tapping point down to the transmitter should be chosen to ensure that adequate cooling occurs to prevent thermal damage to the transducer. Transmitter temperature rating as well as steam possible max temperatures needs to be considered to calculate the length and not just the "rule of thumb". The impulse line MUST be filled with ambient temp water prior to start-up putting transmitter online for the first time to prevent possible thermal damage to the transducer by the live steam.
The original idea if the catch pot, a million years ago, in steam level, flow and pressure applications was to form a thermal buffer between the steam and the transmitter and to keep the impulse line to the transmitter filled to exactly the same level all the time. The T-Piece fitting instead of a catch pot, can do exactly the same job. All you need to do is install the transmitter in some applications a bit lower down or further away from the tapping points.
The overall effect is exactly the same in level, flow and pressure steam installations. I am battling with the installation of steam flow meter. The manufacturer is confusing me. Initially the condensate pot was below steam line. But after amendment it stop reading. I checked the DPT. I am completely screwed over. My boss is quarreling with me. The idea is to - have two condensate pots, one for each impulse leg, at exactly the same elevation. Read Sam's post above, and look at a couple of these graphic illustrations to get an idea of what the seal pots should be doing.
This one shows the contents of the condensate pot: This one shows the Filling Tees that do the same thing as a condensate pot, that Sam is talking about, on a horizontal steam pipe: Similar to the one above, but for a vertical steam pipe: This one shows close coupled filling Tees above the horizontal steam pipe http: This one shows older style piping with horizontal condensate pots: In my experience there is no technical problem if you install the pressure transmitter without a condensate pot as long as you keep sufficient impulse tube length for the cooling down of the temperature.
However, use of condensate pot has some advantages.
It allows steam line to be short and most part of the impulse tube handling liquid only thus reducing the chance of leakage. Also condensate pot allows for easy start up without waiting for steam to cool down.
But for DP flow measurement application condensate pot is a must. Not only that condensate pot location is also vital.
The main technical reason is to avoid the unequal condensation between two lines. Otherwise you will get wrong DP and wrong flow measurement. My personal experience in one project I have seen the flow signal to be oscillating continuously. You have clicked on the "?
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Thus the stronger the vacuum in the process vessel, the greater the signal output by the DP transmitter: One of the greatest versatility of DP transmitters is their use in inferring many other process variables. One of such variable is level measurement. From our elementary physics, we know that Liquids generate pressure proportional to height depth due to their weight.
Applications of DP transmitters ~ Learning Instrumentation And Control Engineering
Mathematically, this can be put as:. With this simple relation above, we may use a DP transmitter as a liquid level-sensing device if the density of the liquid remains fairly constant. The diagrams below represent two variants of the application of DP transmitters in level measurement applications:. Please see Level Measurement for more on measuring liquid level. Another very common inferential measurement using DP transmitters is the measurement of fluid flow through a pipe. Pressure dropped across a constriction in the pipe varies in relation to flow rate and fluid density. If the fluid density remains fairly constant, we can measure pressure drop across a piping constriction and use that measurement to infer flow rate.
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The most common form of constriction used for inferring flow in most industrial applications is the orifice plate. The orifice plate is a metal plate with a precisely machined hole in the center. As fluid passes through this hole, its velocity changes, causing a pressure drop. It is this pressure drop across the orifice plate that is then used to infer the flow rate in the pipe:. As seen in the diagram above, in using the orifice plate to measure flow, one port of the DP transmitter is connected to the upstream side of the pipe while the other port is connected to the downstream side of the pipe.