PRODUCTION FAQ
Q1: What are the core characteristics of LSAW steel pipes?
Manufactured using the straight seam submerged arc welding process, with a single steel plate formed in one go. Advantages: high dimensional accuracy (ellipticity ≤ 0.6%), extremely strong pressure resistance, specifically designed for high-pressure oil and gas transportation and complex terrain pipeline projects.
Q2: What are the typical engineering applications of SSAW steel pipes?
Produced using spiral continuous welding, offering high production efficiency and low costs. Primarily used for medium-to-low-pressure water supply pipelines, building pile foundations, and structural supports. Note that ellipticity control (typically ≤1.2%) is required due to the spiral weld seam.
Q3: What are the core differences between FBE, 3LPE, and 3LPP coatings?
FBE: Single-layer fusion-bonded epoxy powder, providing basic chemical corrosion protection;
3LPE: FBE + adhesive layer + polyethylene, offering resistance to mechanical damage and suitability for harsh environments;
3LPP: FBE + adhesive layer + polypropylene, with high-temperature resistance >110°C, used for hot oil/steam pipelines.
Cost: FBE < 3LPE < 3LPP
STANDARDS FAQ
Q1: What are the core differences between API 5L and ISO 3183?
API 5L (American standard) specifies oil and gas transmission pipes, focusing on chemical composition and mechanical properties; ISO 3183 (international standard) adds toughness and defect acceptance requirements, which are more stringent and applicable to global projects. Both cover PSL1/PSL2 classifications.
Q2: What are the differences in the application areas of EN 10217 and EN 10219?
EN 10217: Standard for welded steel pipes for pressure applications, used for liquid/gas transportation (e.g., water pipes, gas pipes); EN 10219: Standard for cold-formed welded structural tubes, used for building frames and mechanical supports, emphasizing dimensional tolerances.
A53: General-purpose carbon steel pipe standard (water supply/low-pressure gas), divided into seamless/welded pipes; A500: Cold-formed structural pipe standard (non-pressure), requiring higher mechanical properties (such as bending strength), used for building frames.
APPLICATION FAQ
Q1: What type of steel pipe is suitable for building pile foundation engineering?
SSAW pile pipes are recommended (low cost + high production efficiency), with a wall thickness of ≥12 mm to ensure load-bearing capacity. Standards: ASTM A252 (welded pile pipes) or SY/T 0135 (spiral pile pipes).
Q2: How should urban drinking water pipelines be selected?
Food-grade lined steel pipes (e.g., FBE or 3LPE inner coating) must be used. Pipe material selection: SSAW/LSAW (balancing cost and pressure). Standards: EN 10255 (threaded pipes) + NSF/ANSI 61 health certification.
Q3: Key considerations for selecting high-pressure natural gas transmission pipelines?
LSAW steel pipes (pressure rating ≥ X70 grade) + 3LPE corrosion protection (resistance to soil stress) must be used. Standard combination: API 5L PSL2 (pipe material) + SY/T 0413 (coating). SSAW pipes (insufficient pressure rating) are strictly prohibited.
