The cage type hydraulic external line-up clamp is a purpose-built pipe-alignment tool used during pipeline welding to bring two pipe ends into precise alignment before the root pass. A rigid cage frame wraps the pipe while hydraulic jacks apply controlled, high clamping force to correct misalignment, offset and gap - enabling fast, repeatable fit-up on mainline, tie-in and repair welds.
Key Features & Advantages
High clamping force for positive, slip-free alignment of heavy-wall pipe.
Wide size coverage - supplied for multiple pipe sizes from 16" (406 mm) and above.
Dedicated single-size design: each clamp is built for one pipe diameter, so no field adjustment is required.
High efficiency: aligns pipe joints in minutes with no setup changes.
Alignment accuracy: butt-joint mismatch held at 1.5 mm (0.06") or less.
Arched crossbar (no-tack) design allows 360° continuous welding without removing the clamp.
Hydraulic power from a manual hand pump - no electricity or fuel needed on site.
Rugged, portable construction for both field and shop use.
Design & Operation
Cage frame + hydraulic jacks: a manual hand pump actuates the jacks to draw the joint square and level.
Pad options: standard square bar stock with bent ends for slightly misshapen pipe; no-tack pads for uninterrupted access to the pipe seam; stainless-steel pads for welding stainless steel pipe.
Closing options: hydraulic actuation (typical 16"–72") is standard; lever/cam manual closing (2"–72") is offered on related external clamps for quick, non-powered operation.
Technical Specifications
| Model | Pipe OD (mm / inch) | Weight (kg) | Clamping Force |
|---|---|---|---|
| GW12 | 305 mm / 12" | 27 | 5 t |
| GW16 | 406 mm / 16" | 55 | 5 t |
| GW18 | 457 mm / 18" | 65 | 5 t |
| GW20 | 508 mm / 20" | 77 | 10 t |
| GW22 | 559 mm / 22" | 80 | 10 t |
| GW24 | 610 mm / 24" | 85 | 10 t |
| GW26 | 660 mm / 26" | 90 | 10 t |
| GW30 | 762 mm / 30" | 90 | 10 t |
| GW32 | 813 mm / 32" | 95 | 10 t |
| GW36 | 914 mm / 36" | 100 | 10 t |
| GW40 | 1016 mm / 40" | 110 | 10 t |
| GW42 | 1067 mm / 42" | 115 | 10 t |
| GW46 | 1168 mm / 46" | 120 | 10 t |
| GW48 | 1220 mm / 48" | 125 | 10 t |
| GW52 | 1321 mm / 52" | 140 | 10 t |
| GW56 | 1422 mm / 56" | 160 | 10 t |
Reference models - replace with your own model codes. Operating temperature: -19°C to +60°C. Confirm dimensions, weight and clamping force against your actual product before order.
Applications
Long-distance oil & gas transmission pipelines
Refineries, petrochemical and chemical plants
City gas and water pipeline networks
Offshore and subsea tie-in welds
Pipeline rehabilitation and repair welding
Customization & Supply
Custom sizes and metric dimensions manufactured to your specification.
Optional pad types for both carbon-steel and stainless-steel pipe.
Shipped worldwide; share pipe OD, wall thickness and quantity for a quote.
Frequently Asked Questions
What is a cage type hydraulic external line-up clamp used for?
It aligns two pipe ends before welding on pipelines, refineries and plant piping, correcting misalignment, offset and gap so the root weld can be made accurately.
What pipe sizes are available?
Standard cage hydraulic clamps are supplied from 16" (406 mm) upward, with a common reference range of 16"–56" (406–1422 mm); larger diameters and metric sizes are available on request.
What alignment accuracy can I expect?
Butt-joint mismatch is held at 1.5 mm (0.06") or less when the clamp is correctly sized and seated.
Does the clamp need electricity or an air supply?
No. The hydraulic system is powered by a manual hand pump, so it works anywhere without power or fuel.
Can welding continue 360° without removing the clamp?
Yes. The arched crossbar (no-tack) design leaves the weld seam clear, allowing continuous all-around welding without taking the clamp off.
Request a Quote
Send us your pipe outer diameter, wall thickness and quantity, and our team will return a quotation with lead time. For non-standard sizes, share the drawing or dimension requirements.
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