TABLE OF CONTENTS The maximum allowable design pressure stress will depend upon the intended service for the pipeline.
Pipelines to be used for transporting liquid petroleum are covered by ANSI/ASME B31.4 "Liquid Petroleum Transportation Piping Systems." Pipelines used for transporting gas are covered by ANSI/ASME B31.8 "Gas Transmission and Distribution Systems."
Pipelines that must be operated in compliance with the Federal Pipeline Safety Regulations will also need to comply with the applicable parts of these regulations: Part 192 for gas transportation systems and Part 195 for liquid transportation systems.
The maximum allowable pressure is calculated by the following equation:
where: P = Design pressure, lb/in 2.
S=Specified minimum yield strength, lb/in. 2(see Table 1)
| Specification | Grade | Type 1 | SMYS, psi | |
|---|---|---|---|---|
| API 5L | A25 |
| BW, ERW, S | 25,000 |
| API 5L | A |
| ERW, FW, S, DSA | 30,000 |
| API 5L | B |
| ERW, FW, S, DSA | 35,000 |
| API 5LS [Note (2)] | A |
| ERW, DSA | 30,000 |
| API 5LS | B |
| ERW, DSA | 35,000 |
| API 5LS | X42 |
| ERW, DSA | 42,000 |
| API 5LS | X46 |
| ERW, DSA | 46,000 |
| API 5LS | X52 |
| ERW, DSA | 52,000 |
| API 5LS | X56 |
| ERW, DSA | 56,000 |
| API 5LS | X60 |
| ERW, DSA | 60,000 |
| API 5LS | X65 |
| ERW, DSA | 65,000 |
| API 5LS | X70 |
| ERW, DSA | 70,000 |
| API 5LX [Note (2)] | X42 |
| ERW, FW, S, DSA | 42,000 |
| API 5LX | X46 |
| ERW, FW, S,... |
