For different media, what is the effective depth of the thermocouple and thermal resistor sleeves inserted into the medium?
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For different media, what is the effective depth of the thermocouple and thermal resistor sleeves inserted into the medium? * * ： , the medium is high temperature and high pressure steam, when the nominal diameter of the pipeline is equal to or less than 250nan, the effective depth is 70mm ； When the nominal diameter of the pipe is greater than 250mm, the effective depth is 100mm. For steam, gas and liquid media with pipes equal to or less than 500mm, the effective depth is approximately 1/2 of the outer diameter of the pipe. When the outer diameter is greater than 500mm, the effective depth is 300mm. For smoke, wind and wind powder mixture media, the effective depth is 1/3 to 1/2 of the outer diameter of the pipe. Ask Hiyou Experts: I saw the above question today and * * , please ask the above * * Is there a specification or standard to support it?
Instrument selection specifications for SH or HG
API551 has introduced that the thermocouple requires 50mm and the thermal resistor requires 75mm.
This post was last edited by sanjjj at 2016-12-11 06:40 HG/T 20507 2014 requires the following: But with * * Not the same? ? ? ? 4. 1. 2 The immersion depth of the temperature detection element should meet the following requirements: 1 The selection of the immersion depth of the temperature detection element should be based on the principle that the temperature detection element is inserted into an area where the temperature of the measured medium changes sensitively and is representative. 2. When the temperature detection element is installed vertically on a full fluid pipe or at an angle of 45° to the pipe wall. When installing at an angle, the length of the end of the temperature detection element immersed in the inner wall of the pipe should not be less than 50mm and should not be greater than 125mm. 3. When the temperature detection element is installed on the equipment, the length of the end of the temperature detection element immersed in the inner wall of the equipment should not be less than 150mm. When installing on furnaces, furnaces and insulating masonry equipment, they should be selected according to actual needs.
SH/T 3005-2016 5.3.11 The selection of thermometer sleeves should comply with the following provisions:: e) The insertion depth of the thermometer sleeve should ensure that the end point of the temperature measuring element is located in the sensitive area for temperature changes of the medium being measured. When installing in a pipe, the insertion depth should be 1/3 to 1/2 of the pipe diameter, and should be inserted at least 50mm into the pipe. ； When installing in a container, the insertion depth should be at least 150mm from the inner wall of the container, but for containers with agitators, the insertion depth can be shortened appropriately. ； and * * Nor is it a match
Generally, it is required to exceed 1/3 to 1/2 of the pipe diameter.
Exceeding 1/3 to 1/2 of the pipe diameter is the basic requirement. For pipes with larger diameters, the general insertion depth is 400mm, that is, 200mm-250mm into the pipe.
I haven't studied it yet, but I suggest you read the Green Book - Petrochemical Engineering Design Manual.