Product Description

Brand: He Guo Group Model: CFW-60/0.8

Material: Stainless Steel, Diameter: 2916mm

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

Heat exchange area - See drawing m², Environmental temperature - See drawing °C

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

Origin: Shandong Heze

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

1. Preparations

Tanks should be tested for airtightness, flushed, and valves and instruments checked before use.

1.1 Airtightness Test

The tank should undergo a system tightness test after installation is completed or the inner cylinder returns to normal temperature, prior to filling with low-temperature liquids. The test pressure shall be the maximum working pressure of the tank, using oil-free dry air or dry nitrogen for the test gas. The duration of the test shall be determined based on the size of the tank, but it 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. Following the purge with dry air or nitrogen, the system should also be purged with product gas. During the purge, gases lighter than air are introduced at the top through the vent valve, and removed at 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 have gas expelled from the joints to remove moisture from the pipes. This should continue until the dew point of the gas排出 from the inner tank system meets the required standard before liquid can be filled.

1.3 Valve and Instrument Inspection

Before filling with low-temperature liquid, ensure that the valves are in the correct position, the gauges are responsive and reliable, and the level gauge connections are clear and unobstructed.

2. Filling: includes initial filling and supplementary filling.

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

2.1.1 Connect the filling pipeline.

2.1.2 Perform blowout on the filling pipeline (to 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 and clean the pipeline to remove moisture and dust impurities.

2.1.3 Open the internal pipe vent valve and pressure gauge valve, and simultaneously start the level gauge.

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

2.1.5 When the liquid level indicator indicates 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 indicator valve (already opened) is filled with liquid and sprays it out, it indicates that the storage tank is full of liquid. Immediately close the liquid inlet and outlet valves, stop the filling process, and open the pipeline residual liquid discharge valve to expel the remaining gas and liquid in the filling pipeline.

2.1.7 Disassemble the filling pipeline upon completion of filling.

2.2 Additional Liquid Filling (referring to the inner cylinder already having low-temperature liquid, no longer requiring cooling of the inner cylinder)

2.2.1 Similar to the initial filling, the difference is that the filling quantity can be increased from the start, and close attention must be paid to pressure changes during the filling process. If liquid is directly introduced through the liquid inlets and outlets, when the pressure rises significantly, to reduce the pressure, switch from bottom (lower) filling to top (upper) filling.

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

2.2.3 During the atmospheric filling process, the inner cylinder vent valve remains open, allowing the inner cylinder to be in communication with the atmosphere, hence the term "atmospheric filling."

While being pressurized and filled, the vent valve is closed, and the pressure inside the tank exceeds atmospheric pressure, hence the term "pressurized filling." However, the operating pressure of the storage tank should be greater than 2 Kg/cm2. Whether under standard atmospheric pressure or engineering atmospheric pressure, 1 Kg/cm2 = 98,100 Pa = 0.0981 MPa.

3. Boost Pressure

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

The boost program is:

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

3.2 Ensure the valve for gas passage is fully open.

3.3 Open the pre-compressor valve (boost valve) slowly to allow the liquid to vaporize in the supercharger. If the draining speed is fast, the inner cylinder pressure will drop rapidly; in this case, you can open the boost valve wider. When the pressure reaches the required working pressure, reduce or completely close the pre-compressor valve. At this point, the liquid inside the supercharger will continue to evaporate until the desired pressure is reached. During the boost process, closely monitor the pressure gauge readings.

4. Liquid Discharge

There are three forms of liquid discharge.

4.1. Carburetor Drain

Once the pressure in the tank reaches the required level, the drain valve can be opened to supply liquid to the vaporizer, where it is heated and vaporized for use at the site. This is the primary drain method for tanks equipped with a vaporizer.

4.2 Liquid discharge via liquid进出口 valves

This draining process utilizes a输液管 to supply liquid to tanker trucks or larger storage tanks. The operating procedures are essentially the same as for filling, with the only difference being that the liquid inlet and outlet valves switch from filling to draining.

4.3 Discharge through a drain valve (also known as a liquid discharge valve) or directly through a Dewar tube

This drainage is for supplying liquid to portable small containers like Dewar flasks. Secure the metal flexible tube from the small container to the drainage valve (or through the Dewar tube), open the liquid outlet valve, and the liquid can be supplied. The drainage volume is relatively small, and for fixed storage tanks, it may not require pressurization depending on the specific circumstances, allowing liquid to be supplied externally without it.

5. Storage

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

5.1 Pressure Vessel Storage

During atmospheric storage, the vent valve of the inner cylinder is always open, allowing the gas from natural evaporation to be discharged into the atmosphere through this valve, preventing the pressure inside the tank 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 pressure inside the tank.)

5.2 Pressurized Storage

During pressurized storage, the vent valve is closed, as the gaseous substance from natural evaporation remains inside the tank, causing the inner cylinder pressure to gradually rise. At this point, the pressure gauge indicates pressure; when the inner cylinder pressure reaches the working pressure, the vent valve should be immediately opened to relieve the pressure.

6. Issues with simultaneous filling and draining of fluid

Many situations require a continuous supply of gas, which is met when there are two or more tanks. However, for a single storage tank, whether it can supply gas continuously hinges on whether it can perform filling and emptying simultaneously. Generally, for filling liquid into a fixed storage tank using 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 frequently adjusted, as filling from the top (upper part) can reduce the pressure inside the tank, while filling from the bottom (lower part) can increase the pressure inside the tank.

6.3 When refilling and draining simultaneously, if liquid is being introduced from the bottom and the pressure requirements are not met, you can open and adjust the size of the pressure booster valve to maintain stable tank pressure.

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.碰撞 is strictly prohibited to prevent damage to the housing and affect the vacuum degree.

The tank's vacuum level should be checked every six months. To measure it, simply unscrew the protective cap on the metal thermowell and insert the plug of the thermocouple vacuum gauge, then you can know the true vacuum level of the jacket.

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

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

Product Description

Brand Huoguo Group Model CFW-60/0.8

Material: Stainless Steel, Diameter: 2916mm

Application Range    -162℃    Volume    60000L

Heat Exchange Area See Drawing sqm Ambient Temperature See Drawing °C

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

Origin: Shandong, Heze

60-cubic-meter LNG Storage Tank, Horizontal LNG Storage Tank, Professional Manufacturer of Liquefied Natural Gas Storage Tanks

LNG tanks are atmospheric pressure, low-temperature large storage vessels, typically flat-bottomed, double-walled cylindrical. The inner cylinder is usually made of 9% nickel alloy steel, but can also be all aluminum, stainless steel foil, or prestressed concrete. The outer wall is made of carbon steel or prestressed concrete. The suspended thermal support platform at the top of the wall is aluminum, while the tank roof is constructed from carbon steel or concrete. The main thermal insulation materials inside the LNG tank include expanded perlite, elastic glass fiber felt, and foam glass bricks.

LNG Tank Characteristics Requirements

Low-temperature resistance

The boiling point of liquefied natural gas at atmospheric pressure is -162°C. Therefore, LNG storage tanks must have excellent low-temperature resistance and insulation properties.

(2) High safety requirements

Due to the storage of low-temperature liquids inside the tank, in the event of an accident, the refrigerated liquid would volatilize in large quantities, with the vaporization amount being approximately 625 times that of the original refrigerated state, forming an explosive mixture in the atmosphere. Therefore, double-walled tank structures are required, utilizing the containment concept. In the event of leakage in the first tank, the second tank can completely seal the leaked liquid and the evaporated gas, ensuring storage safety.

(3) Special materials.

The inner can must be able to withstand low temperatures, made of austenitic stainless steel, while the outer casing is made of Q345R ordinary low-carbon alloy steel plate.

(4) Strict thermal insulation measures.

Due to the maximum temperature difference between inside and outside the drum of up to 200°C, the drum must have excellent insulation properties to maintain an internal temperature of -160°C. High-performance insulation material should be filled between the inner and outer drums. The insulation material at the drum bottom must also possess sufficient pressure-bearing capacity. (5) Good seismic performance

General building seismic requirements are to crack under specified seismic loads but not collapse. To ensure the safety of storage tanks under unexpected loads, they must possess excellent seismic performance. Ensure that the tank body remains undamaged under the given seismic intensity. (6) Strict construction requirements

The tank welds must undergo 100% magnetic particle inspection (MT) and 100% vacuum tightness test (VBT). Strict selection of insulation materials is required, and the prescribed procedures must be followed during construction.

Huzhou Boiler Factory Co., Ltd. is a key enterprise designated by the China National Bureau of Quality Supervision, Inspection and Quarantine for the production of boiler pressure vessels. It is also a vice-president unit of the China Industrial Boiler Industry Association, a member unit of the China Association of HVAC and Drainage, and holds B-level boiler manufacturing (serial number TS2110587-2011), third-class pressure vessel manufacturing (serial number TS2210916-2013) and design qualifications (serial number TS1237085-2011). Additionally, it has passed the ISO9001 international quality management system certification.

Heze Boiler Factory Co., Ltd. Main Products:

Chemical Storage Tanks (liquefied gas tanks, liquefied petroleum gas tanks, liquid ammonia tanks, propane tanks, propylene tanks, isobutane tanks, methyl chloride tanks, etc.); Non-standard Pressure Vessels (towers, heat exchangers, autoclaves, reaction vessels, stainless steel containers, etc.)

Cooling Auxiliary Equipment (evaporative coolers, ammonia storage tanks, condensate drums, circulating drums, oil separators, separators, condensers, intermediate coolers, siphon tanks, economizers, etc.)

Boiler equipment (Steam boilers, Hot water boilers, Thermal oil boilers, Oil-gas boilers, Waste heat boilers, etc.)

Low-temperature Storage Tanks (Liquid Oxygen Storage Tanks, Liquid Oxygen Vessels, Liquid Nitrogen Storage Tanks, Liquid Nitrogen Vessels, Liquid Argon Storage Tanks, Carbon Dioxide Storage Tanks, LNG Storage Tanks, Liquefied Natural Gas Storage Tanks)

60-cubic-meter LNG Tank, Horizontal LNG Storage Tank, Professional Manufacturer of Liquefied Natural Gas Storage Tanks