Internal line up clamps are suitable for the construction of long-distance oil and natural gas pipelines, pressure fluid transmission has high requirements for welding, the use of internal line up clamp can quickly align pipe ends, ensure alignment accuracy and welding quality.

What is an internal line up clamp?

The internal line up clamp is a device used to fix the pipe ends of two pipes from the inside of the pipe before the pipe ends are welded, the high-low effect after aligning is usually less than 1~2mm.

Where to use the internal line up clamp?

Internal line up clamps are suitable for the construction of long-distance oil and natural gas pipelines, pressure fluid transmission has high requirements for welding, the use of internal line up clamp can quickly align pipe ends, ensure alignment accuracy and welding quality.

Structure of internal line up clamps:

Internal line up clamps normally consists of 5 parts

Expanding and retracting device: this is the core part of the internal alignment clamp which is mainly composed of a cylinder, a connecting rod mechanism, and clamp shoes. The movement of the cylinder drives the connecting rod mechanism, and makes the clamp shoes expanding or retracting accordingly.

Air tank: use to store compressed air to provide power for the travel of the pneumatic internal line up clamp and the movement of the cylinder

Walking and braking mechanism:

Air system

Electrical system (applicable to electronically controlled internal line up clamps)

As per welding modes, Deping also offers other types of pneumatic internal line up clamps, such as: internal clamp with copper shoes, internal clamp with purge system (air dam), internal clamp for pipe prefabrication, a laser and camera system for root welding inspection can be connected to the rear part of internal clamp as well

How to use internal line up clamps?

For the first time use, adopt a sideboom to hoist the internal alignment clamp into the first pipe and make it walk to the end of the pipe that needs to be welded, so that the rear clamp shoes are expanded and contact against the inner wall of the pipe; use the sideboom to lift the second pipe The pipe is put into the head part of the internal line up clamp, and the wire rope is lightly pulled to make the front clamp shoes expanding and contact against the inner wall of the pipe. Measure the misalignment at both ends of the pipe to make it meet the requirement. If it is out of specification, retract the clamp shoes, adjust the pipe end, and then re-align until the requirements are met.

Maintenance of internal line up clamps:

- Check whether the brake disc is reliable.

- Check whether there is a lot of condensed water in the triplet and clean it up in time, whether the lubricator has enough lubricating oil and the oil dripping speed is normal, whether the filter element needs to be cleaned and replaced, and deal with the problem in time

- Clean up the dirt on the surface of the internal alignment clamp, avoid the dirt to enter inside equipment and cause failure

- Check all rotating parts of the internal pneumatic line up clamp to make sure they turn freely

- Check whether the plugs and cables are damaged or loose, and solve problems in time

- Check the air leakage of air components such as cylinders, valves, motors and joints, and whether the operation is normal. If there is air leakage, check whether the joint is tightened, and wrap Teflon tape around the joint

Storage of internal line up clamps:

- After the project is completed, pay attention to the following points prior to internal pneumatic line up clamp storage

- Drain the remaining compressed air from the equipment.

- Clean the dust, welding slag and other debris on the surface of the equipment (pay special attention to the driving and traveling axles, the front and rear ejector rods, and the joints of each cylinder, valve and motor).

- Clean the condensate from the air tank and blow dry with compressed air.

- After cleaning the impurities at the front and rear ejector rods, cover with grease.

- Grease the drive chain.

- Seal the cable plug on internal line up clamp and the cable plug of the remote control box with tape (applicable to the electric control internal line up clamp)

- Take off the battery and remote control handle of the internal line up clamp and store it separately. (applicable to electronically controlled internal line up clamp)

- After placing the internal line up clamp on the mounting rack, spray anti-rust oil on the surface of the equipment, wrap it with a waterproof cloth, and store it in a ventilated and dry place.