Why can't the gas station measure the oil by man-made? Confined oil requirement and level meter management

Why can't the gas station manually measure the oil? Direct answer: manual measuring of oil should open the measuring port, and the tank gas is directly connected to the atmosphere, which is a clear non-sealed discharge point; the requirements for investigation and rectification have made it clear that the underground oil tank should use electronic liquid level meter to measure the oil, except for the necessary instrument calibration, inspection and spot check, maintenance and other manual measurement, manual measuring of oil is not allowed. Daily liquid level data is provided by the liquid level meter. Manual oil measurement is only used as a means of calibration and verification, and the end cover must be sealed well after operation. Operating a station with the gauge hatch open is tantamount to leaving a permanently open vent valve in the system.

How much is the discharge of man-made oil?

It seems that the amount of oil and gas discharged by a man-made amount of oil is not much, but it is a fixed action of each oil intake-the amount before oil unloading and the amount after oil unloading, which accumulates over time. What is more troublesome is the problem of operating habits: the end cover is forgotten, the gasket is aging, the cover is not tight, and the oil dosing port changes from "occasionally open" to "continuous seepage". The investigation requires that the end cover of the oil measuring port be included in the closed point detection list, precisely because the probability of problems is really high. After switching to a level meter, the discharge point disappears directly, which is the most thorough treatment.

How to manage the level meter

The level meter is not just installed. Daily depends on whether the data is continuous and reasonable-liquid level jump, long time motionless, and obviously inconsistent with the refueling amount, all indicate probe or instrument failure. Calibration shall be carried out periodically. Only manual oil comparison shall be allowed during calibration, and calibration records shall be kept on file. The probe should be cleaned on schedule. Oil hanging on the wall and deposits will cause the reading to drift. The alarm function of the level meter should be enabled and tested. High level alarm is the first line of defense against oil spill and cannot be used as a decoration.

Operation and Record

1. Daily liquid level data shall be based on the reading of the liquid level meter, and manual oil measurement shall not be performed;
2. If the data of the level meter is abnormal, check the instrument first, and then arrange the calibration;
3. For calibration and maintenance, if the oil must be measured manually, the end cover shall be sealed immediately after operation;
4. The gasket of the end cover of the oil-filling port shall be included in the monthly inspection, and the aging shall be replaced;
5. Liquid level data, calibration records and maintenance records shall be filed together;
6. Personnel training is in place to clarify under what circumstances opening is allowed.

The value of records

The value of the record is retroactive. In the investigation of oil spill accidents, the liquid level curve is the core evidence. Stations with complete ledger can explain the liquid level and operation at each time point, while stations with missing ledger can only rely on memory. The level meter data is exported and backed up regularly, and cross-checked with the purchase, sale and storage data, which is also the embodiment of the site's own management level.

How to manage the transition period

For stations that have not yet completed the transformation of the liquid level gauge, the manual oil gauge will be the strictest during the transition period: limiting the operators, specifying the operation timing, checking the seal of the end cover after operation, and bringing the oil gauge into the key inspection points. At the same time, the renovation is on the agenda-this investment is replaced by a permanent emission point, and the account can be calculated. During the transformation, attention should be paid to the selection of the liquid level meter to match the tank type and medium. The installation position should be designed according to the design. Don't try to save trouble and install the probe in the dead corner.

How much is the difference between the reading and the actual level meter a fault?

According to the accuracy index given by the manufacturer, it is beyond the range or the data is obviously illogical-the liquid level does not move or jump-I .e. it is checked according to the fault, and it is not used with disease.

how to reduce emissions when the amount of oil?

Keep the opening time as low as possible, cover the end cover and check the gasket immediately after operation, and merge those that can be delayed to the calibration window into the calibration operation.

Does the end cover of the oil port need to be replaced regularly?

The gasket shall be replaced according to the state, and if hardening, deformation and leakage are found in monthly inspection, the gasket shall be replaced immediately; if the end cover body is damaged, it shall be replaced together.

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.