Conditions required for foam pig pigging
At the beginning of the pipeline pigging operation, for safe and smooth pigging. Some preparatory work must be done so that the foam pig can begin the pigging operation. The following small series tells you about the conditions required for the pig cleaning of the foam pig, and I hope to help everyone.
Prerequisites for the cleaning of the foam pig pipeline: First, the pipelines are all connected and the valve commissioning is normal; the cleaning is carried out before the production.
Pipe cleaning should be based on the drop and corrosion degree of the pipe. A foam pig can be used. When the pipe cleaner is used for pigging, the pig should carry aluminum caliper and electronic tracking equipment to detect the degree of pipe deformation and track pigging. The operation of the device.
The basic conditions for the cleanup of the pipeline are:
1. Pipeline section pressure test has been completed.
2. After the inspection pipelines are all connected, the ball valve and bypass pipelines, pipe fittings, ball-passing indicators, and induction parts are all installed. The equal-diameter tee needs to be installed.
3. The whole line cut-off valve and bypass valve are flexible, the full-line shut-off valve is in the fully open position, and the bypass valve is in the fully closed position.
4. The ball sweeping line uses compressed air to push the pig. The displacement and pressure of the air compressor need to be selected according to the pipe diameter and design pressure. If the pipe is blocked, the pushing pressure can be gradually increased, but the pushing pressure should not be greater than the working pressure.
The operation method is as follows:
1. Check that the foam pig is intact, the surface is clean and non-staining, and the electronic detection locator is installed correctly;
2. The ball and the receiving cylinder are in the working and receiving state, and the relevant valve switch position is correct. The pressure gauge and the pass indicator are installed correctly;
3. Open the serving tube, load the foam pig from the ball barrel, close the ball barrel, and start the air compressor to press the compressed air into the ball barrel through the connecting line to drive the pig to walk. When the pig passes through the last station Immediately after the ball indicator, notify the first station air compressor to stop, and close the front of the ball receiving cylinder, first vent and then open the ball collecting cylinder to remove debris and take the ball out.
The above is an introduction to the conditions required for the pigging of the foam pig. It is hoped that everyone will understand the conditions required for the pigging of the foam pig.
