GB/T 14291 Spiral Submerged Arc Welded (SSAW) Pipe
GB/T 14291 is the Chinese national standard for "Welded steel pipes for mine fluid service" [citation:1, citation:4, citation:5]. This standard specifically applies to spiral submerged arc welded (SSAW/HSAW) pipes used in mining applications for transporting fluids such as water, slurry, and air under pressure .
📋 Standard Overview
| Attribute | Description |
|---|---|
| Standard Number | GB/T 14291 (full title: "Mine fluid service electric welded steel pipes") [citation:1, citation:4] |
| Current Status | The 2006 version (GB/T 14291-2006) is listed as "replaced" in official records . An older 1993 version (GB/T 14291-1993) also exists . |
| Primary Application | Mine fluid service – including dewatering, ventilation, pneumatic conveying, slurry transport, and other mining fluid handling systems [citation:4, citation:5, citation:6] |
| Pipe Type | Electric welded steel pipe – includes spiral submerged arc welded (SSAW/HSAW) pipes [citation:4, citation:5] |
🔧 Manufacturing Process
GB/T 14291 spiral submerged arc welded pipes are produced using the following process [citation:2, citation:3]:
Raw Material: Hot-rolled steel coils or narrower steel sheets
Forming: The steel strip is spiral-formed into a cylindrical shape at room temperature
Welding: Double-sided submerged arc welding (inside and outside) creates the spiral seam
Testing: Non-destructive testing, hydrostatic testing, and dimensional inspection
Finishing: End preparation and coating as required
📏 Typical Size Range
Based on manufacturer data for SSAW pipes suitable for GB/T 14291 applications [citation:2, citation:4, citation:5]:
| Parameter | Typical Range |
|---|---|
| Outside Diameter | 219 mm to 3620 mm (approx. 8" to 142") |
| Wall Thickness | 3.2 mm to 40 mm (up to 25.4 mm common) |
| Length | 3 m to 18 m (customizable) |
⚙️ Material Grades
Pipes manufactured to GB/T 14291 typically use carbon steel grades suitable for mining environments. Common materials include [citation:4, citation:5, citation:6]:
| Material | Description |
|---|---|
| Q195 / Q215 | Lower strength, economical options for less demanding applications |
| Q235 | The most common material – carbon structural steel with good weldability |
| Q345 | Higher strength option for more demanding mining applications |
🏭 Applications in Mining
GB/T 14291 spiral welded pipes are specifically designed for [citation:4, citation:5, citation:6]:
| Application | Description |
|---|---|
| Mine Dewatering | Pumping groundwater out of mine workings |
| Ventilation Systems | Air supply and exhaust in underground mines |
| Pneumatic Conveying | Transport of materials using compressed air |
| Slurry Transport | Movement of ore/water mixtures |
| Compressed Air Lines | Powering pneumatic mining equipment |
| Fire Protection | Mine fire suppression systems |
🔍 Distinction from Related Standards
| Standard | Application | Key Difference |
|---|---|---|
| GB/T 14291 | Mine fluid service | Specifically for mining environments with potential abrasion and demanding conditions [citation:4, citation:5] |
| GB/T 3091 | Low-pressure fluid service | General purpose (water, air, gas) – less demanding than mining applications [citation:1, citation:4, citation:6] |
| GB/T 9711 | Petroleum and natural gas pipelines | Higher pressure, stricter requirements for oil/gas transmission [citation:4, citation:5] |
| SY/T 5037 | Low-pressure fluid pipelines | Spiral welded pipes for general low-pressure service [citation:4, citation:5] |
📝 Key Considerations
Standard Status: The GB/T 14291 standard is listed as having been updated/replaced . When specifying, verify the current valid version with suppliers.
Manufacturer Listings: Multiple steel pipe manufacturers list GB/T 14291 in their product offerings for SSAW pipes intended for fluid service applications [citation:2, citation:4, citation:5].
Testing Requirements: Pipes for mining applications typically require rigorous non-destructive testing and hydrostatic pressure testing to ensure reliability in demanding environments.
Corrosion Protection: For mining applications involving corrosive fluids or environments, additional coatings (epoxy, galvanizing, etc.) may be specified.
💡 Summary
GB/T 14291 spiral submerged arc welded pipes are specifically designed for the demanding conditions of mining fluid handling systems. They combine the economical production benefits of spiral welding (SSAW/HSAW) with material grades suitable for mine dewatering, ventilation, slurry transport, and other mining applications. When specifying these pipes, ensure you verify the current standard version and select appropriate material grades (Q235, Q345) based on your specific pressure and environmental requirements [citation:2, citation:4, citation:5, citation:6].
