Specifications related to nitrogen release point design
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A few days ago, I participated in the pre-startup safety review PSSR of a certain device and found that there is a safety valve on a nitrogen pipeline of about DN150 on site. The operating pressure of N2 in the pipeline is about 7 kg (gauge pressure). The safety valve relief port is not equipped with a discharge lead-out pipeline and is directly discharged on the spot. A hand valve with a high operating frequency is installed on the pipeline about 40cm away from the safety valve. I believe that this design has certain safety risks. When a person operates the hand valve, once the safety valve takes off, it will quickly lead to an increase in the N2 concentration in the local space in the operating area, and there is a risk of suffocation for the person. Could you please provide us with the relevant domestic specifications and standards regarding the safety design of nitrogen discharge outlets? Please provide the relevant standard name and relevant terms.
GB 16912-1997 "Technical Regulations on Safety of Oxygen and Related Gases" 7.1 Nitrogen 7.1.1 An oil-free lubrication nitrogen compressor should be used. Nitrogen compressors must have a complete protection system. 7.1.2 The nitrogen pressure station and the air separation main control room should be equipped with reliable parking alarm contact signals or parking interlock devices, and a contact system should be established. 7.1.3 After the nitrogen compressor is in operation, the nitrogen behind the machine should be analyzed. Only when the purity is qualified can it be sent to the pipe network, the outlet of the storage system and the entrance of the nitrogen user. It is advisable to establish a complete purity testing and protection system. 7.1.4 Newly installed nitrogen pipelines and containers must be purged and replaced with nitrogen before they can be put into use. 7.1.5 Nitrogen pipelines are not allowed to be laid in access trenches. 7.1.6 In various places where nitrogen is used, the oxygen content of the surrounding atmosphere should be analyzed regularly, and its concentration should not be less than 18%. 7.1.7 A warning line should be hung near the nitrogen discharge port and the discharge pipe mouth, and a "No Entry" sign should be hung. Nitrogen should be discharged at high altitude. This post was last edited by lyhh9024 on 2009-4-1 22:12 ]