Recently, a batch of fluorine-lined self-priming pumps equipped with the API Plan 54 mechanical seal flush scheme from Teflow Pump & Valve has successfully passed factory inspection and packaging, and been shipped to the customer for strong corrosive fluid transfer service.

The wetted parts of these delivered pumps adopt an integrally molded fluorine lining process. The lining is dense, uniform and strongly bonded, enabling long-term resistance to strong acid and corrosive media and solving the problem of pump body corrosion damage during corrosive fluid transfer. Featuring stable self-priming capability, the pumps require no flooded suction or foot valve. They are suitable for liquid extraction from low-level tanks and medium unloading, with flexible installation and easy start-stop operation.

To address the customer’s tough operating conditions, including seal face erosion and stringent leakage control requirements, Teflow’s technical team customized the external pressurized barrier flush solution of API Plan 54. An independent external system continuously supplies clean pressurized barrier fluid at a pressure higher than that inside the seal chamber, forming a dependable barrier to separate corrosive process media from the seal faces. It delivers high circulation flow and excellent heat dissipation. Even when the pump is on standby, the seal faces can be continuously cooled and lubricated, greatly extending mechanical seal service life. It prevents medium leakage at the source, meeting the project’s strict requirements for zero leakage and stable continuous operation, ideal for high-risk corrosive fluid transfer applications.

From scheme design, fabrication and assembly to hydrostatic testing and joint commissioning of the seal system, Teflow Pump & Valve implements full-process quality inspection. Self-priming performance, pressure resistance indicators and stability of the seal flush system are verified item by item to guarantee qualified performance of every unit. Adequate protection, checking and verification are arranged before shipment to ensure safe delivery to the site. Teflow will continue to follow up on on-site operation afterward, supporting smooth commissioning and stable running of the customer’s plant with reliable products and professional technical services.