Api RP 500 [PDF]

Zitiervorschau

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)

Copyright American Petroleum Institute Provided by IHS under license with API No reproduction or networking permitted without license from IHS

Not for Resale

--`,,```,,,,````-`-`,,`,,`,`,,`---

0.5 m (18 in.)