Type | Feature | Area | Safety Buffer |
A | -Metallic and the MAOP produces a hoop stress of 20 percent or more of SMYS. If the stress level is unknown, an operator must determine the stress level according to the applicable provisions in Chapter 9 of this Subpart. -Non-metallic and the MAOP is more than 125 psig (862 kPa). | Class 2, 3, or 4 location (see §505). | None. |
B | -Metallic and the MAOP produces a hoop stress of less than 20 percent of SMYS. If the stress level is unknown, an operator must determine the stress level according to the applicable provisions in Chapter 9 of this Subpart. -Non-metallic and the MAOP is 125 psig (862 kPa) or less. | Area 1. Class 3 or 4 location. Area 2. An area within a Class 2 location the operator determines by using any of the following three methods: (a) A Class 2 location. (b) An area extending 150 feet (45.7 m) on each side of the centerline of any continuous 1 mile (1.6 km) of pipeline and including more than 10 but fewer than 46 dwellings. (c) An area extending 150 feet (45.7 m) on each side of the centerline of any continuous 1000 feet (305 m) of pipeline and including 5 or more dwellings. | If the gathering line is in Area 2(b) or 2(c), the additional lengths of line extend upstream and downstream from the area to a point where the line is at least 150 feet (45.7 m) from the nearest dwelling in the area. However, if a cluster of dwellings in Area 2 (b) or 2(c) qualifies a line as Type B, the Type B classification ends 150 feet (45.7 m) from the nearest dwelling in the cluster. |
C | Outside diameter greater than or equal to 8.625 inches and any of the following: -Metallic and the MAOP produces a hoop stress of 20 percent or more of SMYS; -If the stress level is unknown, segment is metallic and the MAOP is more than 125 psig (862 kPa); or -Non-metallic and the MAOP is more than 125 psig (862 kPa) | Class 1 location | None. |
R | -Metallic and the MAOP produces a hoop stress of less than 20 percent of SMYS. If the stress level is unknown, an operator must determine the stress level according to the applicable provisions in Chapter 9 of this Subpart. -Non-metallic and the MAOP is 125 psig (862 kPa) or less. | Class 1 and Class 2 locations | None. |
La. Admin. Code tit. 43, § XIII-508