Insertion depth of temperature measuring instrument
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SH/T 3014-2013 Code for Installation and Design of Petrochemical Instruments – Requirements for the Installation of Temperature Measuring Instruments 5.2.8 The insertion depth of temperature measuring elements in storage tanks should not exceed 400 mm, and their installation location should be 600 mm above the heating coils inside the tank. The temperature measurement elements installed on the floating roof tank should not prevent the movement of the floating roof. If the temperature transmitter is flanged, does the insertion depth specified in the standards refer to the net length of the instrument inside the equipment, or to the net length of the instrument inside the equipment plus the total length of the flange fittings? For a 200 m³ storage tank with a diameter of approximately 5 meters, equipped with temperature transmitters mounted on the side, is an insertion depth of U=650 mm suitable for the temperature sensor element?
The insertion depth mentioned in the specifications refers to the net length of the temperature sensing element inside the device, excluding the length of the flanged connector. For a 200 m³ storage tank with a diameter of approximately 5 meters, the insertion depth U of the temperature element of the side-mounted temperature transmitter, which is 650 mm, is greater than the specified value of 400 mm; therefore it is not suitable. According to the SH/T 3014-2013 standard, it is recommended to adjust it to a depth of no more than 400 mm. At the same time, it is necessary to ensure that the installation location is 600 mm above the heating coil inside the tank, without affecting the movement of the floating roof. .
The required insertion depth for installation refers to the length that goes into the inner wall of the device (tank or pipe)； The insertion depth of the temperature sensing element refers to the length from the mounting sealing surface to the tip of the probe.