Experimentos

Date of Issue: August 17, 1998 Affected Publication: API Recommended Practice 500,Recommended Practicefor Class8cation o Locations for Electrical Installations at Petroleum Facilities Classìjìed as f Class I, Division 1 and Division 2, 2nd Edition, November 1997

ERRATA
Thefollowing figures are replaced by the next three pages: Page 79, Figure 90 Page 80, Figure 91 and Page 81, Figure 92.Vent outlet for free flow of high velocity vapor mixtures. Vent outlet for passage of large amount of vapor. Air or inert gas mixtures during cargo loading, and ballasting or during discharge. Also for vent outlet for cargo pressureivacuum valve.

immediately above, below, or next to a cargo tank

Division 1

Ky

Division 2

Special Division 1 (See Seaion 11.6.1)

Notes:

1.

Thisarea classified due to proximity to cargo tanks.

2.
3.

Areas more than 3m(lû') above the weatherdedc are unclassified except as required by this dowment for production
equipment contained therein.

Space must be:
a) b) continuously ventilated at 2 20 air changes per hour, and loss of ventilation must be alarmed in a manned space,and combustible gas detection must be installed inaccordance with sedion 6.5.2 .

c)

or, If ventilated e20 air changes per hour, loss of ventilation is not alarmed, o r gas detectors are not installed, then the space is classified a special Division 1 location.
4.

All spaces are subject to the adjacent space requirements of section 12.5. Cargo is defined as a flammable gas or vapor or flammable or combustible liquid with a flashpoint below6O%(l4O0F)

5.

Figure 90-Typical Floating Production Storage and Offloading Unit (FPSO) (See Section 12.2.1)

S T D - A P I / P E T R O R P S O O - E N G L 1797

0 7 3 2 2 9 0 O b 0 7 3 ' i S 5q7

(Note 2)

1

I

immediately above below or next to a cargo tank.

(Note 3)

1
Division 2

Cargo tank (Note 5) Special Division 1 (SeeSection 11.6.1)

Division 1 Notes:
1.

Thisarea classified due to proximity to cargo tanks. and drilling equipment contained therein.

2. Areas more than 3m(10) above the weatherdeck are unclassified except as required by this document for production
3. Space containing processing equipment or natural gas fueled prime mover with all flammable liquid or gas vents extended to the outside of the area are classified Division 1 if: a) b) c)continuously ventilated at 220 air changes per hour, and loss of ventilation must be alarmed in a manned space, and combustible gas detection must be installed in accordance with section 6.5.2. or, If ventilated e20 air changes per hour, loss of ventilation is not alarmed, or gas detectors are not installed, then the space is classified a Special Division 1 location.

4.
5.

Ail spaces aresubject to the adjacent space requirements of section 12.5.
Cargo is defined as a flammable gas or vapor or flammable or combustible liquid with a flashpoint below 60%(140°F)

Figure 91-Typical Tension Leg Platform (TLP) (See Section 12.3.1)

(Note 2)
I

1

(Note 2)
I

3m( 1O')
I 1

I
Division 1 Notes:

(Note 2)

mmeet the requirements of sedion 12.5 (Typical-

' t

I[Cargo tanks (Note 6) (Note 3) Division 2 Special Division 1 (See Sedion 11.6.1)

1.
2. 3.

This area classified due to proximity to cargo tanks. Areas more than 3m(l O) above the weatherdeck are undassified except as required by this dowment for production and drilling equipment contained therein. Space containing processing equipment or natural gas fueled prime mover with all R a m b l eliquid or gas vents extended to the outside of the area fire classified Division 1 if: a) b) c) continuously ventilated at 2 20 air changes per hour, and loss of ventilation must be alarmed in a manned space, and combustible gas detection must be installed in accordance with section 6.5.2 ,

or, If ventilated e20 air changes per hour, loss of ventilation is not alarmed, oc gas detectors are not...