How to check the leakage point of the crane pipe seal during loading and unloading? Direct answer: The leakage points of the crane tube are concentrated in three places - the rubber sealing ring of the quick connector (dry valve), the joint and low point liquid accumulation of the gas recovery pipeline, and the sealing surface of the rotary joint. Check in three steps: look, smell, and measure: check if the sealing ring of the quick connector is worn, if there is any liquid accumulation at the low point of the gas phase tube, and if there is any leakage or dripping from the rotating connector; Smell for oil odor; Testing can use pressure holding test or infrared imaging to detect VOCs leaks. Many leaks are caused by aging and wear of sealing rings, and regular replacement is more cost-effective than post repair.
Crane tube is the core equipment for liquid loading and unloading, and also the interface for oil and gas recovery chain. Leakage often occurs in three locations: first, the rubber sealing ring inside the quick connector (dry valve), which will leak oil and gas from the gap after long-term insertion and removal wear; The second issue is that the flanges and joints of the gas-phase recovery pipeline are loose or the gaskets are aging, leading to air leakage; The third is the sealing surface between the rotating joint and the movable hinge, which causes fatigue of the sealing element under frequent swinging. These leakage points are often hidden, and by the time they smell or exceed the detection limit, they have already leaked for a while.
Quick connectors are high-frequency plug-in components, and sealing rings are the most vulnerable parts that should be monitored. Check the sealing surface for wear, cracking, and pressure marks. If the rubber ring becomes hard or brittle, it needs to be replaced; The red ring seal and yellow ring buckle of the bottom oil crane tube must be confirmed to be intact before it can be sealed and leak free when docked with the tanker truck. In the industry inspection requirements, it is necessary to check whether the rubber sealing ring inside the quick connector is intact, and replace it if it is worn out or not. Wiping the sealing surface and cleaning residual media after each daily homework can delay aging.
There are two types of leakage points in the gas recovery pipeline: one is the leakage of the joint flange, and the other is the false blockage caused by low point liquid accumulation. Accumulation of fluid can prevent oil and gas from passing through, and an increase in pressure inside the tank can lead to leakage. Therefore, the lowest part of the gas phase pipe should be drained regularly, and any accumulated fluid should be promptly drained. Check the flanges and joints section by section along the pipeline, and use a portable detector to scan the interface. The location of abnormal values is the key suspicion. Avoid storing liquid at a U-shaped bend in the pipeline layout, and discharge any remaining liquid according to regulations after loading.
The rotating joint is responsible for the swinging of the crane tube, and the wear of the sealing surface will cause oil and gas to seep out from the moving parts. Check if there is any leakage or dripping on the joint, flange, emergency disconnect valve, and sealing surface when touched by hand, and if there is any jamming or abnormal noise between the balance spring and the pin shaft. Quantitative inspection with pressure holding test: Hold the pressure according to the specifications for a period of time, and the pressure drop is within the allowable range to be qualified, or use infrared imaging to detect VOCs leakage. Checking whether there are droplets hanging on the wall of the quick connector after loading and unloading is a daily intuitive judgment. Purging and replacement before long-term shutdown can prevent medium crystallization, frost heave, and seal damage.
| Inspection position | Common leakage points | Inspection methods | handle |
|---|---|---|---|
| quick coupling | Wear of sealing ring | Visual buckle | Wear and replace immediately |
| Gas phase pipeline | The flange gasket is old | Scan the detector | Tighten and replace the gasket |
| Gas phase low point | False blockage of fluid accumulation | Discharge observation | Regular drainage |
| rotary joint | Sealing surface fatigue | Touch leakage | Replace the sealing component |
| whole | Hidden leakage | Pressure holding infrared | Recheck according to regulations |
Not following a fixed cycle, observe the wear status; If it becomes hard, brittle, or has pressure marks or cracks, it should be replaced. After each operation, wiping and maintenance can delay the process. It is more cost-effective to replace it if there is wear and tear than to repair it if there is a leak.
It's important, the accumulation of liquid will block the oil and gas channels, push up the tank pressure, and cause leaks; Regularly drain the liquid, avoid low-level liquid storage in the pipeline, and drain any remaining liquid according to regulations after loading.
Daily observation of quick connector droplets hanging on the wall, quantitative use of pressure testing or infrared VOCs imaging; Use a portable detector to scan the joint flange once, and any abnormal values are the key suspicion.
This article by LuoyangWohong PetrochemicalEquipment Co., Ltd. arranges that the company provides design, manufacturing and operation and maintenance services for condensation recovery, membrane separation recovery and complete solvent recovery devices for chemical and pharmaceutical enterprises. If you need process evaluation or scheme configuration, please contact and exchange.
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