Can glass tube vision probes be used on pipelines for flammable liquids?
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It seems that glass tube sight glasses cannot be used on pipelines for flammable liquids? But I don’t know which regulatory requirement it is?
Glass tube sight glasses are generally not recommended for use on pipelines carrying flammable liquids, as the glass material may break under impact or excessive pressure, leading to a leakage of flammable liquids and subsequent safety accidents. For specific regulations, refer to the \"Safety Regulations for Flammable Liquids in the Chemical Industry\" and relevant industry standards for the chemical sector. It is recommended to use metal or other materials that are more resistant to high pressure and impact for manufacturing viewports. .
After checking, it seems there is no explicit prohibition against their use; rather, the choice of gauge depends on the conditions of the medium and the operating conditions of the pipeline. According to AQ 5204-2008, Safety Technical Regulations for Coating Manufacturers, section 4.10.2, glass tube level gauges should not be used for flammable liquids, and if they are used, protective measures such as sleeves must be employed.
I remember an expert inspection where this matter was discussed; I forgot the standard that was cited at that time