The problem that the tee of plumbing parts cannot be used in the explosion hazard area is discussed, and the problem of how to connect the galvanized steel pipe at the corner is discussed. At this stage, some enterprises use elbows, and some enterprises use explosion-proof threading boxes.
The basis for the explosion-proof stringing box is listed as follows.
1. Installation of electrical circuits and electrical equipment in explosion hazard environments (12D401-3)
2. Code for Construction and Quality Acceptance of Automated Instrument Engineering (GB50093-2013)
3. Code for Acceptance of Construction Quality of Petrochemical Instrument Engineering (SH/T3551-2013)
4. Code for Design of Petrochemical Instrument Pipeline (SH/T3019-2016)
5. "Explosive Atmospheres Part 1: General Requirements for Equipment" (GB/T3836.1-2021)
6. "Electrical Safety Regulations for Explosion Hazardous Places of the People's Republic of China (Trial)" (Lao Renhu [1987] No. 36)
Some enterprises use elbows to link galvanized steel pipes in explosion hazard areas, as shown in the figure below.