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RECOMMENDED PRACTICE FOR CLASSIFICATION OF LOCATIONS FOR ELECTRICAL INSTALLATIONS AT PETROLEUM FACILITIES CLASSIFIED AS CLASS I, DIVISION 1 AND DIVISION 2
61
Sample valve, bleed valve, or similar device
0.5 m (18 in.)
0.5 m (18 in.)
0.5 m (18 in.) 1 m (3 ft ) Gas operated surface safety valve actuator vent port
Division 2
Division 1
Figure 39—Flowing Well in a Nonenclosed Adequately Ventilated Area and Without a Cellar or Below Grade Sump (See 10.5.1.1 and 10.15.3.2)
0.5 m (18 in.)
Sample valve, bleed valve, or similar device
0.5 m (18 in.) 0.5 m (18 in.)
Grade 3 m (10 ft)
3 m (10 ft)
Cellar
Division 2
Division 1
Figure 40—Flowing Well in a Nonenclosed Adequately Ventilated Area With an Inadequately Ventilated Cellar or Below Grade Sump (See 10.5.1.2 and 10.15.3.2)
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Not for Resale
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0.5 m (18 in.)