LSAW pipes employ longitudinal welding, where hot rolled coil plates are rolled into a pipe and welded along the length of the seam. Conversely, SSAW pipes feature spiral welding, resembling a helix as steel coils are welded to form the pipe shape. These pipes find extensive application in oil and gas transportation projects, each offering distinct advantages in various operational scenarios.

When comparing spiral steel pipes (SSAW Pipe) with straight seam steel pipes, several crucial distinctions come to light:

1. Pressure-bearing Capacity: Spiral steel pipes typically exhibit higher strength compared to straight seam steel pipes, owing to their manufacturing process involving submerged arc welding.

2. Specifications: Spiral steel pipes predominantly feature specifications above 219mm, emphasizing large diameters. In contrast, straight seam steel pipes are predominantly associated with small diameters.

3. Price Variance: The pricing mechanism for spiral steel pipes typically involves measurement-based settlements, whereas straight seam steel pipes are predominantly priced based on weight. 

In conclusion, the nuanced differences between LSAW and SSAW pipes underscore their unique characteristics and suitability for distinct industrial applications. By understanding the distinct advantages of each pipe variant, industry professionals can make informed decisions regarding pipeline selection based on project requirements, operational parameters, and cost considerations.