How to measure ground resistance fuel dispenser safest

How to measure ground resistance fuel dispenser safest

In an explosive atmosphere, such as gas stations, oil, fuel tank and other equipment must be explosion-proof products. According JJF2-2003 "type anti-static grounding device detection norms", the main station to be tested following the grounding resistance and connection resistance facilities. Instrument testing must meet GB3836-2000 "explosive gas environment with electrical equipment" requirements.

Ex pump

Grounding system at the gas station, oil tank and auto fuel dispenser A ground electrode is connected to a ground electrode loading point C is a separate grounding. Find a separate ground electrode as an auxiliary ground electrode B (such as water pipe, etc.), according to the three-point method were measured with the Meter R1, R2 and R3.

Then find a fuel dispenser grounding mutually independent grounding, such as loading and unloading point grounding so on. With a test line connecting the two points, measured by the Meter readings RT. Where: RT is measured clamp resistance. RC for the loading and unloading point grounding resistors. The fuel dispenser grounding resistance: R = RT-RC

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Gas station in the pipeline designed to parties all sides need to pay attention

Gas station in the pipeline designed to parties all sides need to pay attention

Process piping fixed station should adopt seamless. Buried pipe connections are to be welded. When there is severe corrosive effect on steel soil area buried pipeline, the choice of oil, soil corrosion resistance, static conductive composite pipe. In addition to these caveats, gas pipeline will also be required in the design of what?

1, Automatic Fuel Nozzle should adopt self-styled Automatic Nozzle, flow rate should not exceed 60L / min

2, when the tanker unloading unloading hose communicating, communicating oil and gas recovery hose, antistatic oil resistant hose should be used. Interconnecting hoses should not be less than the nominal diameter of 50 mm.

3, process piping at service stations should be laid underground, and can not pass through the station house and other built structures. When the oil pipeline and the trench, trenches and drains intersect, it should take appropriate measures to prevent leakage.

4, communicating with the tank inlet pipe, snorkel horizontal pipe, and oil and gas recovery tube should slope tank, its slope should be less than 2 ‰.

5, the oil pipeline system design pressure of not less than 0. 6MPa.

6, corrosion design process piping buried outside surface should be consistent with existing national standards "steel pipeline and storage tank corrosion control engineering design specification" of the relevant provisions of SY 0007, and should be used to strengthen the level of not less than the corrosion protection layer insulation.


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Gas station process piping design requirements?

Gas station process piping design process, which should be noted

Gas station process piping design requirements?


1, must be enclosed unloading tanker unloading mode.

2, steam tanker unloading and offloading of oil and gas recovery system should be adopted.

3. When using unloading of oil and gas recovery system should meet the following requirements:
oil and gas recovery pipe interface l) tanker on manual valves should be installed;
2) The user interface of the enclosed unloading pipe joints should be located quickly and boring cover. It should be in the station vapor recovery pipe interface before
3) offloading pipe joints at service stations, oil and gas recovery pipe joints should be located above ground;
4) the tank level gauge should be set with high level alarm functions.

4, fuel dispenser shall not be located in the room.

5, supporting refueling stations should adopt the process tank submersible pump installed a pump for multi-machine (gun) of.

6, when using self-priming fuel dispenser, each fuel dispenser fuel varieties should be set individually into the pipeline.


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When the fuel dispenser vane pump fails, how should we respond?

When the vane pump fuel dispenser is faulty, may cause Automatic Nozzle not out of oil, then how should we respond?

It can be divided into the following situations:

mechanical diesel fuel dispenser

① vane pump relief valve can not be closed. Due to a foreign body (broken shrapnel, etc.) stuck in between the relief valve spool and valve seat, caused by the oil pump is always done in the loop and can not flow, maintenance should remove the valve, remove the valve seat foreign body;

② Because the pump with the rotor blades and the shrapnel long do high-speed operation, will wear due to fatigue, fracture, leading to vent vane pump increases, even when serious loss of pumping action, the pump should be clear debris and repair the damaged blade , shrapnel, re-install the new replacement;

③fuel dispenser vane pumps and oil separators pad bonding surface of pump breakdown or anti-loaded, can also cause the vane pump high-pressure chamber communicates with the low pressure chamber, resulting in the loss of the vane pump oil discharge function;

④ vane pump rotor and the rotor shaft loose, causing the shaft idle, this time in need of replacement repair rotor or vane pump.

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Automatic Nozzle fuel dispenser will not appear out of the oil causes and solutions are there?

Automatic Nozzle fuel dispenser will not appear out of the oil causes and solutions are there?

fuel dispenser boot normally, but no oil Automatic Fuel Nozzle, may reverse the motor or transmission belt is loose, broken. If this is the reason, then we can properly adjust power phase sequence, adjust or replace the belt tensioner wheel can be. If oil and gas separator fails, then you score following cases were analyzed:


① fuel dispenser filters (including conical strainer) is clogged serious. The filter should be cleaned to remove debris;

② oil separator valve stuck untapped oil caused no oil fuel dispenser. Maintenance should remove the valve, reassembly after clearing the debris, so that it can, the next move freely;

③ small oil separator float into the oil or off, can not form a high pressure cavity pressure, no oil will result in fuel dispenser;

④ oil separator pressure pad cover damage caused by high-pressure chamber communicating with the pressure chamber, resulting in high pressure cavity do not form a high-pressure fuel dispenser leaving no oil.

⑤ oil and gas man separator filter pads or spring seat damaged. Replace damaged seal.



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