PIR, Class Location, HCA/MCA per 49 CFR Part 192 / 195
Used only when product is HVL or Crude.
Class location physics, PIR derivation, Mega Rule (2019/2022), IMP requirements, Part 195 USA definitions.
Potential Impact Radius (192.903):
0.69 for natural gas, 0.95 for HVL.
Class Location (192.5):
| Class 1 | ≤ 10 buildings |
| Class 2 | 11 – 45 buildings |
| Class 3 | ≥ 46 OR ≥ 20-person assembly w/in 100 yds |
| Class 4 | 4+ story buildings prevalent |
Design Factor F (192.111):
Class 1 = 0.72 | Class 2 = 0.60 | Class 3 = 0.50 | Class 4 = 0.40
MAOP (Barlow):
E=1.0 seamless/ERW post-1970; T=1.0 ≤ 250°F.
Per 49 CFR 192.5: count buildings within ¼ mile of either side of a continuous 1-mile pipeline section (sliding mile). Class 1: ≤ 10; Class 2: 11–45; Class 3: ≥ 46 or 20-person assembly within 100 yards; Class 4: 4+ story buildings prevalent.
Potential Impact Radius (49 CFR 192.903): the distance from a rupture where 99% mortality probability would result. PIR = 0.69·√(P·D²) for methane; 0.95 for HVL. P in psig, D in inches; PIR in feet.
Yes — 49 CFR 192.611 requires the operator to confirm or reduce MAOP within 24 months when growth shifts the segment to a higher class.