Black Iron Pipe Connection Methods
1. Threaded Connection (Most Common)
- ① Cut tapered external threads at pipe ends using pipe threading machine
- ② Wrap PTFE thread seal tape or apply pipe joint compound
- ③ Tighten fittings (elbows/tees/unions) with pipe wrenches
- ④ *Application: Low-pressure pipelines ≤DN50*
2. Welded Connection (High-Pressure/Critical Pipelines)
- ① Bevel preparation: 35° bevel angle with 2-3mm root face
- ② Execute SMAW (Shielded Metal Arc Welding) or GTAW (Gas Tungsten Arc Welding)
- ③ Conduct post-weld X-ray inspection
3. Flanged Connection (Removable Sections)
- ① Weld Slip-On (SO) flanges to pipe ends
- ② Install oil-resistant asbestos rubber gaskets (gas service grade) between flanges
- ③ Tighten bolts diagonally to specified torque values
Gas Pipe Hanging Specifications
1. Support Selection Criteria
- ① Pipe Diameter Support Type Max. Spacing
- ② ≤DN25 U-shaped single clamp 2.0m
- ③ DN32-50 Double-bolt pipe clamp 3.0m
- ④ ≥DN65 Portal hanger + vibration pad 4.5m
2. Installation Requirements
- ① Wall mounting: M10 expansion anchors (concrete) or through-wall bolts (masonry)
- ② Overhead piping: Install anti-sway braces every 15m, seismic restraints at bends
- ③ Insulating rubber pads between pipe and supports (prevents galvanic corrosion)
- ④ Slope control: Minimum 0.003 gradient toward drainage points
Have any other questions? Welcome to contact us!