Where to check the closed point of oil and gas recovery? Leakage concentration limit and detection method

Direct answer: according to the inspection requirements, focus on the inspection of oil unloading port, oil and gas recovery port, end cover of man-made oil measuring port, liquid collecting tank port, pressure vacuum valve of discharge pipe, oil and gas recovery pipeline, oil and gas recovery system of oil tanker and coupling valve. The oil and gas concentration at each point shall not be higher than 500 micromole per mole. The portable testing instrument shall be used to scan point by point, and the point of reading exceeding the limit shall be up to standard by replacing the sealing ring, improving the sealing method or replacing parts. This test is a fixed action of environmental protection investigation, and the site can self-check according to the point list.

How to list the points

Go through the system again, and all connection points that may leak are points. The end cover and joint of the oil discharge port are the first-the seal wears fastest every time the oil is discharged. The oil and gas recovery port and the coupling valve are the second, and the connection state directly determines the sealing effect. The end cover of the man-made oil outlet is the third, which should be checked at ordinary times. The liquid collecting tank mouth and the discharge pipe valve are the fourth, often failing due to liquid accumulation and scaling. The oil and gas recovery system of the tanker belongs to the fifth, both sides must be recognized. According to the list number one by one, the corresponding point number of the test record will be compared in the next recheck.

What method is used for testing

Use a portable oil and gas concentration detector on site to slowly move samples at the point sealing surface, end cover gap and valve stem, and record when the reading is stable. Before testing, make sure that the range of the instrument covers the expected concentration within the validity period of calibration. There are two main points in the operation method: first, the instrument probe should be as close as possible to the suspicious sealing surface but should not touch it to avoid contaminating the probe; The second is to record the reading of each point after it is stable, and the peak value in movement is not counted. During the test, the system remains in a normal operating state-qualified in the shutdown state does not mean that the operating state is qualified.

How to deal with the overrun point

1. Detect by number according to the point list, and record the concentration reading;
2. Replace the seal ring or improve the sealing method at the overrun point;
3. Replacement parts with failed joints or valve bodies;
4. Notify the carrier of the side of the tanker to make simultaneous rectification;
5. Re-test after disposal, compare and archive the data before and after the same bit;
6. Incorporate point detection into monthly self-inspection to form a trend record.

Closed-loop handling and re-inspection

The handling process must be a closed loop: after replacing the sealing ring, retest at the same measurement point, and only when the data falls below the limit can the task be considered complete. For locations that repeatedly exceed the limit, investigate at the next higher level—check whether the sealing method is incorrect or the component selection is inappropriate; simply replacing the seal ring only addresses the symptoms, not the root cause. Making point-of-sale inspections a monthly self‑inspection item is far more effective than last‑minute cramming before an official inspection.

Relationship with daily inspection

Portable detection solves the problem of "whether there is super" and daily inspection solves the problem of "where may be super. The smell of oil smelled during refueling, traces of oil and dust on the sealing surface, and whether the end cover is properly covered with hands, these signals from naked eyes and nose can narrow the detection range to several points. Combination of the two: suspicious points are found during patrol inspection, confirmed by the instrument, and retested after disposal. Only by the instrument does not patrol, the point number does not match the scene; Only patrol inspection does not detect, subjective judgment cannot replace data.

Is 500 micromoles per mole instantaneous or average?

According to the investigation requirements, the reading of the testing instrument at the on-site point shall prevail. If it exceeds the standard, the point is determined to be inconsistent, and the point position shall be remeasured for confirmation after disposal.

Can the site test itself?

Sure. Equipped with portable oil and gas concentration detector and operated according to regulations, the instrument can be self-checked. The instrument shall be within the validity period of calibration, and the operator can get started with simple training.

Whose responsibility is the point on the tanker?

It belongs to the handover interface, and the carrier shall be notified to rectify the problems found in the site inspection. It is better to specify the responsibilities and rectification time limit of both parties in the agreement.

This article is organized by Luoyang wohong petrochemical equipment co., ltd. the company provides design, manufacture, installation, commissioning and operation and maintenance services for oil and gas recovery equipment, solvent recovery devices and buried composite pipe networks at gas stations, oil depots and chemical enterprises. if you need scheme configuration or on-site investigation, please contact and exchange.