Custom Vertical PO/PE Lined Tank Products & Service

While both belong to the polyolefin chemical family, modified Polyolefin (PO) is an engineered co-polymer formulated with specialized compatibilizers and thermal stabilizers. PO demonstrates superior continuous operating temperature resistance (up to 90°C–95°C compared to 70°C–75°C for standard PE) and displays a higher modulus of elasticity, greatly reducing creep deformation under high hydrostatic pressure heads in tall vertical vessels. Furthermore, PO provides enhanced micro-adhesion to our welded internal tortoise steel mesh, making it the superior technical choice for cyclic temperature applications and negative pressure environments.

Yes. Standard loose-lined, drop-in liners or adhesive-bonded rubber liners frequently fail via vacuum collapse when pumps rapidly discharge tanks without sufficient air venting. Our vertical tanks incorporate an expanded carbon-steel tortoise mesh matrix resistance-welded directly to the inner surface of the steel pressure shell. During our multi-axis rotational thermal molding cycle, molten PO/PE encapsulates and passes entirely through the mesh openings. This creates a dense, permanent mechanical interlocking anchor across every inch of the shell, withstanding full vacuum (-0.098 MPa) without blistering, detachment, or dimensional deformation.

Nominal lining thickness typically ranges between 6mm and 12mm depending on the overall tank volume, fluid density, and corrosive aggressiveness. For high-wear applications or aggressive permeation services (e.g., hot hydrofluoric acid), thicknesses can be engineered up to 14mm. Uniformity is maintained by precisely programming the multi-axis rotational speed ratios and monitoring thermal envelope thermocouples inside our industrial ovens. Smaller nozzle necks (DN50–DN150) receive dedicated pre-heating and custom tooling to ensure the polymer flows evenly right across the raised-face flange without leaving thin wall sections.

Every shipment includes an exhaustive Quality Dossier consisting of: (1) Raw material mill certificates for the steel shell plates and certified virgin resin analysis sheets; (2) Radiographic/Ultrasonic weld inspection reports of the steel pressure boundary; (3) 100% surface Spark Dielectric Verification certificate (20kV–25kV zero pinhole certification); (4) Ultrasonic lining thickness mapping grid across cardinal axes and nozzles; (5) Hydrostatic pressure test reports (typically held at 1.25x design pressure); and (6) Dimensional inspection sign-offs conforming to ASME Section VIII Div 1 or EN 13445 standards.

Solid 316L stainless steel suffers rapid chloride stress cracking and catastrophic pitting when exposed to halides (such as brines, HCl, or FeCl3), resulting in early vessel failure despite high initial costs. FRP tanks offer decent corrosion resistance but are vulnerable to mechanical shock, structural fatigue, UV resin degradation, and catastrophic joint shearing. A vertical carbon-steel PO/PE lined tank provides the structural ductility, external seismic stability, and impact tolerance of heavy steel, paired with the complete chemical immunity of a thick polymer liner. Over a 15- to 20-year service life, it offers the lowest Total Cost of Ownership with virtually zero maintenance downtime.