What are the regulations regarding the layout of the on-site level gauge and the remote level gauge connections on the equipment?
Thread Content
Containers such as storage tanks are equipped with both on-site level gauges and remotely transmitted level gauges; it is not clear whether there are any regulations regarding the elevation of the pipe connections for these two types of level gauges. Among the devices we come into contact with, there are those at the same elevation and those at different elevations. I’m not sure which is more reasonable; are there any relevant regulations in the industry?
On-site level gauges generally include those with glass tubes, magnetic flap type gauges, and float level gauges. They are generally differential type, while those for remote transmission have an additional pressure type. As for the height of the level gauge, it is determined according to requirements. For remote models, there are limitations regarding the high and low positions; it is not necessary for it to be exactly the same as the display on site, but it would be best if they matched
It’s generally best to have it always easy to use; otherwise, if the control panel shows one value while the on-site display shows another, it can get a bit confusing. These days, ones with remote transmission functionality are generally available; you can simply buy one that allows for on-site viewing as well as remote control.
The liquid level displayed in the control room is given as a percentage %. A liquid level of 0% corresponds to the lower interface of the transmitter’s device, while a liquid level of 100% corresponds to the upper interface of the same device. If you do not know the absolute elevation of the transmitter’s outlet (relative to the device’s TL line), then when the control room shows a 30% liquid level, you have no idea what the actual liquid level is. The instrument interface is the same as that of the on-site level gauge, allowing the on-site readings to be matched with those in the control room. Additionally, although the equipment has already started receiving feed, the instruments still need to be calibrated; sometimes on-site level gauges are used as a reference, and calibration is carried out based on the % level, which makes things easier. The measurement range of the transmitter should cover the upper and lower alarm (shutdown) values; however, in the case of on-site level gauges that take into account the complete drainage of the equipment – with the lower end located on the pipeline – the transmitter does not need to align with the outlet of the on-site level gauge. If there is a large difference between the normal liquid level and the shutdown liquid level, for example in the primary suction tank of a compressor, it is not necessary for the liquid level transmitter used for control to have the same opening as the on-site level gauge. @jiaguoyun
I’ve learned it! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !
Thank you all for the answers and sharing.