1. Start with the finished pipe range

The line is described as making electric welded steel pipes with:

• Pipe diameter: φ76–φ89 mm
• Wall thickness: 2.0–5.0 mm
• Pipe length: 4–8 m

If your product mix falls outside φ76–φ89 mm, or you need walls thinner than 2.0 mm or thicker than 5.0 mm, this configuration does not match. Discuss a different specification with the supplier instead of assuming the range can be stretched.

2. Check strip material and dimensions

The published raw material requirements are:

• Strip steel material: Q195–Q345
• Strip width: 238–279 mm
• Strip thickness: 2.0–5.0 mm, supplied as coil

If you buy strip to a different standard or grade designation, ask the supplier to confirm equivalence in writing. The product description does not cover this.

3. Match coil handling to your incoming coils

The entry section uses a single-station manual uncoiler with manual expansion and contraction. It is described as handling coils with:

• Inner diameter Ф762 mm
• Outer diameter Ф1800 mm
• Belt width 280 mm
• Weight 5 tons

Plants that receive heavier or larger coils, or that want a double-station or automated uncoiler, should raise this early. The listed configuration is manual and single-station.

4. Understand the strip joining and accumulation section

• Shearing and welding: hydraulic cutting and a pneumatic pressing platform, with manual welding. The description states this excludes the welding machine, so budget and plan separately for strip-end joining equipment.
• Four-roller delivery machine: gantry frame, upper and lower roller drive, cylinder pressure. Feeding rollers are Ф170 mm × 320 mm face width in GCr15. The drive motor is YCT250-4A at 18.5 kW, with a feeding speed of 140 m/min.
• Cage looper: integral frame with fixed and movable frames, support rollers and tension rollers. It is adjustable to strip width and stores material so forming and sizing can run continuously.

5. Review the forming and sizing main machine

The main machine is listed as follows:

• Welding pipe speed: 60–80 m/min
• Main drive: DC motor Z4-280-42, 250 kW, 1 set, with a ZLY280-10 reducer
• Stand arrangement: passive seven-roller leveling, feeding vertical roller, forming 7 flat and 8 vertical, sizing 6 flat and 6 vertical, then guiding, extrusion, scraping, a cooling water tank and 1 Turkish head (8 rollers, 4 per side)
• Shafts: horizontal shaft Ф100 mm and vertical roller shaft Ф60 mm, both 40Cr, quenched and tempered. The extrusion roller shaft is Ф70 mm, 40Cr, quenched and tempered.
• Gearbox: ZG35# housing with spiral bevel gear transmission, module m=12, gears in 20CrMnTi

The product title refers to high frequency straight seam welding. The published parameter list, however, gives no specification for the high frequency welder itself. Ask the supplier whether a welder is included and get its rating before you compare quotations.

6. Check cutting length and accuracy

The computer flying saw is described with:

• Sawing pipe diameter Ф76–89 mm, wall thickness 2–5 mm
• Fixed length 4–8 m, accuracy ±3 mm
• Maximum 15 cuts/min, maximum running speed 80 m/min
• Saw blade Ф900 mm, maximum trolley travel 2 m
• Sawing motor (AC) 55 kW, driving motor (DC) 22 kW
• Air pressure 5–7 kg/cm²

The overall line parameters list a length accuracy of 0–6 mm, while the flying saw section lists ±3 mm. Confirm which tolerance will be the contractual acceptance value for your order.

7. Confirm straightening capability

The straightening machine removes stress and bending after forming and welding. It uses a four-column frame with four upper passive rollers and two lower driven rollers. The upper rollers are pressed down by a manual worm gear. Listed parameters:

• Motor 30 kW, straightening speed 100 m/min
• Pipe diameter φ60–φ89 mm, wall thickness 2.0–5.0 mm
• Straightening rollers φ220×400 mm (upper) and φ200×240 mm (lower), GCr15, HRC60–65
• Roller angle to the pipe: 30°

Roller tables and stands are listed with customized drawings available.

Where this line does not apply

• Seamless pipe: this is a straight seam welded line, not a seamless pipe production line.
• Sizes outside φ76–φ89 mm or 2.0–5.0 mm wall: you need a different specification.
• Specific pipe standards or end uses: the materials do not state compliance with any line pipe, gas pipe or other product standard, and do not list certifications. Do not assume suitability for welded line pipe service without separate confirmation.
• Price, delivery time and installation scope: none of these are given in the product materials. Request them directly.

Pre-quotation checklist

1. Your target diameter, wall thickness and length range against φ76–φ89 mm, 2.0–5.0 mm and 4–8 m
2. Strip grade, width (238–279 mm) and coil ID/OD/weight against the uncoiler limits
3. Whether strip-end welding equipment and the high frequency welder are in scope
4. The required cut-length tolerance (0–6 mm line figure vs ±3 mm saw figure)
5. Your target line speed against 60–80 m/min
6. Roller table, stand and roller mold requirements for your layout

If your requirements match these points, the φ76–φ89 welded pipe production line is a reasonable candidate to discuss in detail with BzZhou Xinghua Machinery Equipment Manufacturing Co.,LTD.