Receiving and launching devices for pigging facilities
发布日期:2020-11-04       点击数:445       
Pig sending and receiving devices shall be set at both ends of the pipe section through which the pig passes. The length of the section to be pigged depends on the function of the pig, the location of the pumping station, the operation method, the material of the worn surface of the pig and the friction conditions. The lubricating condition of crude oil pipeline is better, and the limit distance of pig passing through is longer than that of gas pipeline and other pipelines. In the crude oil pipeline, the limit passing distance of pig is 480km and the pigging ball is 800km. However, the specific determination of pigging distance depends on the number of cleaning objects in the pipeline and the pump station location. If the pig passes through the intermediate pump station and is not taken out, the pump station must have a pigging process.

The launching and receiving of pig and pig ball are carried out by the launcher and receiver of special 6, as shown in Fig. 5-54. The sending cylinder and receiving cylinder are respectively connected with the main pipe, and the other side is connected with the main pipe through the pipe. The diameter of sending cylinder and receiving cylinder is generally 50-100 mm larger than that of main pipe. The position of the bypass pipe on the transmitting cylinder is close to the switch blind plate, while on the receiving cylinder, it is close to the reducer. The diameter of bypass pipe is generally 1 / 3 of that of main pipe. The length of pig and the number of pig launched at one time shall be considered for the length of launcher. In addition to the number of pigging balls to be received at one time, the receiving barrel length should also reserve the volume to hold the pig. The upper side of the cylinder body is provided with an exhaust valve, and the lower side is provided with a blowdown valve. Pig pass indicators are installed on both launcher and receiver.

The pig of the launcher is set at the downstream side of the bypass valve of the launcher through the indicator, and the receiver is installed on the short pipe inside the main line valve. The indicator should be installed above the pipe to avoid the entry of foreign matters.


Shenyang Xinlian Petrochemical Equipment Co., Ltd

Professional pipeline pigging equipment and its supporting equipment and non-standard pipeline equipment

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