Multi-nozzle fuel dispensers are a common configuration in gas stations. However, when a single oil and gas recovery system operates with multiple nozzles, over time, the recovery performance of each nozzle tends to diverge: some nozzles recover smoothly, while others are noticeably weaker. This imbalance not only affects the recovery efficiency but also exposes issues during inspection and comparison. This article explains how to determine the equilibrium state, where the disparities come from, and how to adjust them back to balance.
Why does imbalance occur in a multi-gun system
The recycling pipeline and power source shared by multiple guns are the same, theoretically, each gun should perform consistently. However, differences may gradually emerge in practical use. There are several common reasons for this: Firstly, the usage frequency of each gun varies. Guns that are used more frequently experience faster wear of seals and changes in pipeline status. Secondly, the level of daily maintenance for the guns and recycling ports differs. Some gun interfaces are cleaned thoroughly, while others accumulate oil and dust over time. Thirdly, there are inherent differences in pipeline layout. Guns located farther from the power source have longer pipelines and greater resistance. Fourthly, component aging is not synchronized, and the status of guns in the same batch may no longer be consistent after several years of use.
To determine whether it is balanced, the most intuitive approach is to compare the recovery performance of each gun under similar operations: observe the gas return status during operation, listen to the sound, and check for any obvious differences. Then, summarize daily observation records to observe trends.
Five steps for inspection and judgment
- Record by gun: Record the workload and recycling observation status of each gun separately, and accumulate comparative data;
- Horizontal comparison: Compare the recovery performance of each nozzle during the same time period and for similar oil products, and identify the nozzles that are significantly weaker;
- Check interface sealing: Inspect the sealing status of the gun head and recovery port of the weaker gun one by one, and replace the worn parts first;
- Check the pipeline status: walk through the branch pipeline routing, low points, and interfaces corresponding to the weak gun one by one to eliminate blockages and leaks;
- Re-check and confirmation: After processing, conduct another round of gun comparison to confirm that the gap has converged, and then record and archive the results.
Common causes and corresponding handling methods
During inspection, follow the order of "easy problems first, then difficult ones; seals first, then pipelines". Most of the imbalance issues arise from consumable parts such as seals and interfaces, which require low-cost treatment. Problems with pipelines and power sources are relatively rare, but they take more time to troubleshoot, so they should be addressed later. Record the reasons and solutions for each round of inspection. After a few rounds, you will get to know the "temperament" of each gun in the station, and you will have a focus for daily maintenance.
| Common reasons | Typical manifestations | Handling method |
|---|---|---|
| The sealing component of the gun head is worn | The recoil of this gun is noticeably weak | Replace the sealing components and verify the convergence condition |
| Recover oil and dust accumulated in the interface | The interface is not sealed tightly, and the air return is not smooth | Clean the interface and inspect the condition of the sealing surface |
| Fluid accumulation at the low point of the branch pipe | The resistance of some guns is relatively high | Drain the low-lying fluid and check the slope direction |
| Pipeline interface leakage | Abnormal noise or performance fluctuation during recycling | Inspect each interface, tighten or replace as necessary |
| Difference in usage frequency | The state of the high-frequency gun deteriorates faster | High-frequency gun encryption maintenance and inspection frequency |
Adjusted tracking and routine maintenance
Adjustment is not a one-time process: The first few weeks after replacing the seals serve as an observation window, and only when the performance is confirmed to be stable can it be considered that the treatment is in place. For daily maintenance, it is recommended to incorporate gun inspection into routine tasks - during each round of inspection, take a moment to check the cleanliness and sealing status of each gun's connection. For guns that are used frequently, the maintenance frequency should be appropriately increased. By maintaining the status of each gun close to each other, the overall performance of the recycling system will be stable, and it will be less likely for individual guns to lag behind during inspection and comparison.
Frequently Asked Questions
Does the imbalance of multiple guns necessarily require the manufacturer to handle?
First, conduct a self-inspection. Tasks such as seal replacement, interface cleaning, and low-point drainage fall within the scope of routine maintenance at the station. Most discrepancies can be addressed during the self-inspection stage. If there are still noticeable issues after the self-inspection, submit the sub-gun records to the manufacturer and bring the data to their doorstep for efficient resolution.
What level of performance disparity among guns would be considered uneven?
It is not recommended to rigidly adhere to numerical values. The practical approach is that if the performance of a certain gun under similar operations significantly deviates from other guns and the observed trend persists, it is worth investigating. Rather than focusing on the exact difference, it is better to keep records of the performance of each gun, and the differences will become apparent on their own.
Can newly installed equipment also exhibit imbalances?
The status of each component of the new equipment is consistent, and generally, issues are unlikely to occur in the short term. If a certain nozzle shows obvious weakness shortly after the new station is put into use, it is mostly related to the pipeline routing or interface handling during the installation process. Please directly contact the installer for a review.
This article is compiled by Luoyang Wohong Petrochemical Equipment Co., Ltd. The company provides design and manufacturing, skid-mounted customization, installation and commissioning, as well as after-sales operation and maintenance services for three-time oil and gas recovery equipment to gas stations and oil depots. If you need on-site inspection or scheme configuration, please feel free to contact us for discussion.