Jiwei Fork Liquid Level Switch Applied in Level Measurement for LNG High Pressure Storage Tank
A company in Chongqing that manufactures LNG filling systems and CNG filling machines is a designated enterprise by the National Oil Equipment Center. With Jiwei’s Ring-11 Fork Liquid Level Switch, the company participated in a bidding process for a Sinopec project that involved liquid level measurement for 50 x 104 Nm³/d LNG (liquid natural gas) high-pressure storage tanks. Due to the specific properties of liquid natural gas, the project placed stringent requirements on the level meters in the bidding document. These included a process pressure tolerance of 5.5 MPa, an ingress protection rating of IP65, explosion protection certified for Ex d IIB T4, and a measured medium density of 593 kg/m³. Jiwei’s Ring-11 met all the specifications outlined in the bidding document, allowing the company to win the bid for its superior quality.
While the final bidding result was thrilling, the process was highly competitive. The tenderee carefully compared all participating products from both domestic and international manufacturers. After evaluating each specification and quality of the participating level meters and considering the challenging application conditions on-site, the customer ultimately chose Jiwei’s Ring-11 as the designated level meter for the project. Jiwei’s Ring-11 won the bid due to its reliability and high quality, comparable to imported brand products, while offering a higher cost-effectiveness.
The technical advantages and exceptional quality of Jiwei’s Ring-11 Fork Liquid Level Switch helped the project succeed. The level switch met all the project requirements, and its high quality and cost-effectiveness made Ring-11 stand out among similar products in the market.
Comparison of Project Specifications and Jiwei Ring-11:
| Specification | Project Requirements | Jiwei Ring-11 Qualification |
|---|---|---|
| Measuring density | 593 kg/m³ | Min. 500 kg/m³ |
| Process pressure | 5.5 MPa | Max. 6.4 MPa |
| Temperature | Not specified | Max. 250°C |
| Ingress protection | IP65 | IP66/IP67 |
| Explosion protection | Ex d IIB T4 | Ex d IIC T6 & Ex ia IIC T6 |
The level meter in the Sinopec project was used for high-pressure storage tanks. Given the project’s stringent requirements for pressure resistance alone, Jiwei’s Ring-11 was comparable to international brand names and much better than its domestic counterparts (see comparison table below). Since imported brand products tend to be very expensive, their cost-effectiveness is often a disadvantage. This is why Jiwei’s Ring-11 won the project in competition with international level meters.
Comparison of Pressure Resistance:
| Product | Pressure Resistance |
|---|---|
| Jiwei Ring-11 Fork Liquid Level Switch | -1 to 6.4 MPa |
| Other similar domestic products | -1 to 4 MPa |
| International brand products | -1 to 6.4 MPa |
Under a high process pressure of 5.5 MPa, if the installed level meter fails to withstand the high pressure, it could lead to a serious leakage accident. Jiwei’s Ring-11 Fork Liquid Level Switch is designed with an accessory—an airtight insulation sleeve—that provides secondary protection for safety. In case the probe is damaged due to high pressure or corrosion, the airtight insulation sleeve can prevent liquid from reaching the aluminum electronic housing. This unique feature distinguishes Jiwei’s Ring-11 from its domestic counterparts.
In conclusion, Jiwei’s Ring-11 won the project because it met all the project requirements, very few domestic products can reliably work under such high pressure and measure liquids with such low density, and imported products are too expensive and not as cost-effective as Ring-11.
Since initial installation, Jiwei’s Ring-11 Fork Liquid Level Switches have performed exceptionally in accuracy and reliability within the project application. Jiwei gains customers’ trust with the demonstrated high quality of its products.