Product Description

Brand Hoekou Group Model CFW-60/0.8

Material: Stainless Steel, Diameter: 2916mm

Application Range: -162℃; Volume: 60,000L

Heat exchange area  See drawing m² Ambient temperature  See drawing °C

Wall Thickness: 8mm; Outer Dimensions: φ2916*14929mm

Origin: Shandong Heze

    

LNG Tank, Low Temperature Natural Gas Tank, 60 Cubic Meter LNG Tank, Imported Paint from the USA, High Vacuum Level

1. Preparatory Work

Tanks should undergo airtightness tests, blow-down treatment, and valve and instrument inspections before being put into use.

1.1 Airtightness Test

The tank should undergo a system airtightness test after installation is complete or the inner cylinder returns to normal temperature, prior to filling with low-temperature liquid. The test pressure shall be the maximum working pressure of the tank, using oil-free dry air or dry nitrogen as the test gas. The test duration shall be determined based on the tank size but must not be less than 4 hours.

1.2 Blowing Treatment

After the airtightness test passes, the inner tank system must be purged with oil-free dry air or dry nitrogen to remove moisture. After purging with dry air or nitrogen, the product gas should also be used for purging. During purging, gases lighter than air are added from the top, through the vent valve, and removed from the bottom via the liquid inlet and outlet valves. To accelerate the removal of moisture inside the tank, the purge gas can be heated to 80-100°C. Each pipe and valve should be purged individually, especially the level gauge and pressure gauge, which should be purged from the joints to remove moisture from the pipes. The liquid filling can only begin once the dew point of the gas exiting the inner tank system meets the required standard.

1.3 Valve Gauge Inspection

Before filling with low-temperature liquid, it is essential to check that the valves are in the correct position, that the gauges are functioning smoothly and reliably, and that the level gauge connections are clear and unobstructed.

2. Filling: divided into initial filling and topping up filling.

2.1 Initial Filling (referring to filling while the inner cylinder is in a heated state). The steps are as follows:

2.1.1 Connect the filling pipeline.

2.1.2. Blow out the filling pipeline (this should be done before each filling), and before the upper liquid inlet and outlet valves are opened, place a small amount of liquid into the output pipeline from the liquid source valve. Simultaneously, open the pipeline residual liquid drain valve to clean the pipeline, removing moisture and dust impurities within.

2.1.3 Open the vent valve and pressure gauge valve of the inner tube, and simultaneously start the level gauge.

2.1.4 Open the upper liquid inlet valve to allow liquid to enter from above. Since the inner cylinder is in a hot state, the opening of the upper liquid inlet valve should be small to allow the pipeline and inner cylinder to cool slowly to the temperature of the liquid being filled. Once the inner cylinder's vent valve stabilizes the exhaust, you can open the upper liquid inlet valve wider to increase the filling speed.

2.1.5 When the liquid level indicator indicates a liquid level, open the liquid inlet and outlet valves, and close the upper liquid inlet valve to switch from upper to lower liquid inlet.

2.1.6 When the liquid fills the indicator valve (which has already been opened) and sprays out, it indicates that the storage tank is full of liquid. Immediate closure of the liquid inlet and outlet valves is required, stopping the filling process while opening the pipeline residual liquid discharge valve to expel the remaining gas and liquid in the filling pipeline.

2.1.7 Remove the liquid filling pipeline upon completion of filling.

2.2. Supplemental Filling (referring to the inner cylinder already containing low-temperature liquid, no longer requiring cooling of the inner cylinder)

2.2.1 Similar to the initial filling, the difference is that a higher filling quantity can be added from the start, and close attention must be paid to pressure changes during the filling process. If filling directly through the liquid inlet and outlet valves, when the pressure increases significantly, switch from lower (bottom) filling to upper (top) filling to reduce pressure.

2.2.2 Additionally, from the perspective of pressure, it can be categorized into atmospheric filling and pressure-filled filling.

2.2.3 During the atmospheric filling process, the inner cylinder vent is always open, allowing the inner cylinder to be in communication with the atmosphere, hence the name "atmospheric filling."

Pressurized filling in progress, vent valve closed, tank pressure higher than atmospheric pressure, hence the term "pressurized filling." However, the operating pressure of the storage tank should exceed 2 Kg/cm². Whether under standard atmospheric pressure or engineering atmospheric pressure, 1 Kg/cm² = 98100 Pa = 0.0981 MPa.

3. Boost Pressure

When the liquid in the storage tank needs to be transferred to other storage tanks or used for vaporization, the internal cylinder pressure must be increased. The increase in pressure should be determined based on the actual usage requirements of the user, but it must not exceed the maximum working pressure of the storage tank.

The boost program is:

3.1 Check if the pressure gauge and level gauge are in working condition.

3.2 Ensure the gas valve is fully open.

3.3 Open the turbocharger inlet valve (boost valve) slowly to allow the liquid to vaporize in the turbocharger. If the drainage speed is fast, the inner cylinder pressure will drop quickly, so you can open the boost valve wider. Once the pressure reaches the required working pressure, close or fully close the turbocharger inlet valve; at this point, the liquid inside the turbocharger will continue to evaporate to reach the desired pressure. During the boosting process, closely monitor the pressure gauge readings.

4. Liquid Discharge

Three forms of liquid effluent are available.

4.1 Carburetor Drain

Once the pressure inside the tank reaches the required level, the drain valve can be opened to supply liquid to the evaporator, where it is heated and vaporized for delivery to the point of use. This is the primary drainage method for tanks equipped with an evaporator.

4.2 Liquid discharge through liquid进出口 valves

This draining process involves supplying liquid to tank trucks or larger storage tanks using输液软管 (infusion hoses), and its operational procedure is essentially the same as refueling, with the only difference being that the liquid inlet and outlet valves switch from intake to discharge.

4.3 Drainage valve (also known as the liquid discharge valve) or direct drainage through a Dewar tube

This type of draining is for supplying liquid to portable small containers like Dewar flasks. Connect the metal flexible hose from the small container to the drain valve (or through a Dewar tube), open the liquid outlet valve, and the liquid can be supplied. This draining amount is small, and for fixed storage tanks, it may not require pressurization based on specific circumstances, allowing for liquid supply externally.

5. Storage

Liquid storage includes two methods: atmospheric storage and pressurized storage.

5.1 At atmospheric pressure storage

During atmospheric storage, the vent valve of the inner cylinder is always open to allow the gas from natural evaporation to escape into the atmosphere, preventing the tank pressure from rising. Since the natural evaporation is minimal, the vent valve only needs to be slightly open. (The opening should be adjusted to maintain constant tank pressure.)

5.2 Pressure-Driven Storage

During the pressurized storage process, the vent valve is closed. Because the gas from natural evaporation remains inside the tank, the internal pressure gradually increases. At this point, the pressure gauge shows the pressure. When the internal pressure reaches the working pressure, the vent valve should be immediately opened to relieve pressure.

6. Issues with simultaneous filling and draining of fluid

There are many occasions that require a continuous supply of gas, and this can be achieved with two or more tanks. However, for a single storage tank, whether continuous gas supply is possible hinges on the tank's ability to simultaneously fill and empty. Generally, when refilling fixed storage tanks with tank trucks, simultaneous filling and emptying should meet the following conditions:

6.1 The working pressure of fixed storage tanks should be above 0.02 Mpa.

6.2 During the liquid filling process, the upper liquid inlet valve and the liquid inlet and outlet valves should be adjusted frequently, as liquid entering from the top (top) can reduce the pressure inside the tank, while liquid entering from the bottom (bottom) can increase the pressure inside the tank.

6.3 When both filling and draining are in progress, if the liquid is entering from the bottom (lower part) and still cannot meet the pressure requirements, you can open and adjust the size of the pressure booster valve to maintain stable pressure inside the tank.

7. Maintain

7.1 Do not tamper with the outer cylinder explosion-proof device and vacuum valve; otherwise, it will destroy the vacuum degree of the storage tank.

7.2 The housing is an external pressure vessel that withstands atmospheric pressure; collision is strictly prohibited to prevent damage to the housing and affect the vacuum degree.

The tank vacuum level is checked every six months. To measure, simply unscrew the protective cap on the metal thermocouple and insert the plug of the thermocouple vacuum gauge, then you can know the true vacuum level of the sandwich.

7.3 After several years of use, the vacuum level in the tank may drop below 66.66 Pa, at which point a re-evacuation is required.

 

LNG Storage Tank, Low Temperature Natural Gas Storage Tank, 60 Cubic Meters LNG Storage Tank, Imported Paint from USA, High Vacuum Degree

Which well-known Liquefied Natural Gas (LNG) storage tank is the best? - Wholesale prices for high-quality LNG storage tanks - How much is a horizontal 30-cubic-meter LNG storage tank? - Professional LNG storage tank contact number