Pipeline pig transceiver arrangement principle

Pipeline pig transceiver arrangement principle

(1) Straight-through ball valves and slab gate valves with diversion holes shall be used for valves passing through the pigs. Ball valves and non-drain slab gate valves shall be used for valves that do not pass the pigs;

(2) The structural length of the pig transceiver barrel should meet the requirements for passing the pig or detector;

(3) The pig clearing device shall pass the indicator between 1km out of the pig and the receiving pipe and the trunk gate; the pig shall send the three-way clearing device through the indicator;

(4) The installation height of the pig transceiver tube should be 0.8-1.3m, and the maximum should not exceed 1.5m;

(5) The quick-switching blind plate on the transceiver tube of the pig should not face the residential area or building (construction) area with the spacing less than or equal to 60m;

(6) Sewage oil pool should be provided under the blind tube of the pigging transceiver. Sewage tanks shall be provided in the pigging area. The slop oil of the pigging operation shall be collected and disposed of in a centralized manner and shall not be discharged at will;

(7) The pigging shall adopt a closed pigging process;

(8) When the emissions from natural gas pigging contain Class A and Class B liquids, separation equipment should be introduced to recover the condensate and the gas is discharged to a safe area.

Additional instructions:

1. The pig collection and delivery tube is an important part of the pigging line cleaning equipment. It is installed at both ends of the pipeline for transmitting and receiving the pig. It is mainly composed of a quick opening blind plate, a cylinder body, a reducer pipe, a saddle bracket and the like.

2. Classification: The receiving and sending balls are divided according to the purpose: A type and B type are used for transmitting and receiving ordinary pigs. A, B type difference: A type material is taken over the side of the cylinder, and type B is above. ;

3. Connection and installation of the pig transceiver barrel: a) The installation of the ball and socket is divided into two types: ground and underground. Underground installations need to be equipped with silos, and the installation and delivery of the ball cylinders and the loading and unloading of the pigs are not easy to use. b) When installing on the ground, the receiving and sending ball cylinder is horizontal, and the height of the center from the ground is generally about 1m. It is connected to the underground pipeline through the short pipe and the elbow. It is not suitable to adopt the oblique * connection. Otherwise, the easy card main pig, the transceiver ball and the pipeline connection form, see the last picture uploaded - the pigging process flow chart. c) The receiving and sending ball cylinders shall be horizontally laid flat, and the diameter of the receiving and serving ball valves shall be equal to the inner diameter of the pipe to be cleaned. The receiving and sending ball ports and the oil inlet (gas, water) ports are respectively connected to the main pipe through a valve. A vent valve should be provided at the upper end of the open-opening blind plate near the transceiver ball. Safety valve and pressure gauge, sewage valve on the lower part, and oil (gas, water) valve on the side to take the medium from the main pipe as the power and output medium for driving the pig.

Is the pipeline piger required to bend the elbow?

Answer: The pipe pig has a requirement for the radius of curvature of the elbow. Different models (different by type and type of pig) and different sizes of pigs have different requirements on the radius of curvature of the elbow. In general: in addition to the requirements of the straight pipe pig is 1 when DN ≤ 65mm, the radius of curvature of the elbow should meet R ≥ 4D, 2 when DN ≤ 100mm, the radius of curvature of the elbow should meet R ≥ 2D, 3 when DN ≥ 150mm, The radius of curvature of the elbow should satisfy R ≥ 1.5D. The requirements of other pigs are generally 1 when DN ≤ 100mm, the radius of curvature of the elbow should meet R ≥ 2D, 2 when DN ≥ 150mm, the radius of curvature of the elbow should meet R ≥ 1.5D.

The radius of curvature of the elbow R ≥ 1.5D can meet the requirements, of course, the larger the R, the better. I also very much agree with the manufacturer's view that the larger the R, the better. The larger the R, the lower the thermal stress of the pipe will be. The larger the R, the better the effect of the ball. However, the project still needs to consider saving the investment for the owner. It cannot be wasted and fulfills the professional responsibility as an engineer. It is best to use an elbow that achieves the radius of curvature of the elbow of this type of pig, without the need for higher requirements.

Install on the pipeline:

1. Principles for setting up the long-distance pipeline pigging device:

For pipelines such as crude oil, refined oil, and natural gas, a pigging device is required. The pigging of crude oil pipelines is more to clean up the waxes which are precipitated in the crude oil during the production and operation phase. The refined oil and natural gas are used for the cleaning of the pigs in the early stage of the operation. Above the tube.

2. Clearing station setting spacing:

The setting of the pigging station is not regulated in China, and the setting density of the crude oil pipeline pigging station should be the largest. General pigging stations are built with other types of stations. There are relatively few pigging stations installed in the whole line of refined oil pipelines. A pipeline has been set up at a distance of 150 kilometers in a pipeline of 600 kilometers in China.

3. Type of pig:

With the advancement of technology, the pig has gradually bid farewell to its most original pigging function, and gradually integrated functions such as intelligent detection. For domestic long-distance pipelines, the barrels are still very mature, but this year also applied a pigging valve on short-distance small-diameter pipelines, and the effect is not bad.

4. Setting up the pigging process:

The main process directly enters the station, and the pigging process is switched through the valve to the medium after the ball is sent and received.

5, the receiving and dispatching ball barrel layout installation requirements:

To be suitable for workers to operate and to be safe, install a safety valve on the receiving and sending ball barrel, and the quick opening blind plate cannot face the human activity area.

6. Operating procedures and precautions for pigging operations:

For larger diameter pigs, receivers and transmitters should be installed to reduce the labor intensity of workers.