PTFE Lined Corrosion Resistant Storage Vessel

PTFE Lined Corrosion Resistant Storage Vessel is a dual-structure industrial storage container independently developed by Zhuoyan, specially oriented to ultra-severe corrosive liquid storage scenarios that ordinary lined tanks cannot adapt. Different from general chemical storage tanks that only adapt conventional acid-base media, this corrosion-resistant series upgrades lining bonding process and raw material purity, targeting fluorine-containing corrosive liquids, high-temperature oxidizing solvents and long-period static storage working conditions. The vessel combines high-strength pressure-resistant carbon steel outer shell and seamless sodium-activated PTFE inner liner, realizing mechanical rigidity and full chemical inertness at the same time. Vertical, horizontal and conical-bottom three structural types are optional, covering small lab buffer 100L up to large outdoor industrial 80000L volume, widely deployed in high-corrosion industrial production lines worldwide.

Complete Technical Specification Table

Working Principle

The anti-corrosion storage vessel adopts double-layer isolation protection principle, which is divided into load-bearing outer layer and anti-corrosion inner barrier layer to cut off medium corrosion path completely:

1.Outer Steel Shell Bearing Layer: Q345R pressure vessel carbon steel serves as mechanical support, bearing tank internal pressure, external impact and outdoor wind load, guaranteeing long-term structural stability of the whole tank body.

2.PTFE Inert Barrier Liner: Seamless integrated PTFE sheet is tightly attached to inner tank wall via vacuum activation pasting technology. PTFE owns extremely stable molecular structure, almost no chemical reaction with any corrosive medium. It forms a permanent isolation film between metal shell and stored liquid, preventing acid, alkali, fluorine solvent from contacting steel surface to avoid perforation and leakage.

3.Sealed Closed Structure: All manholes, nozzles and flanges adopt full PTFE lining without exposed metal dead angles, eliminate tiny corrosion gaps at pipeline connection positions, solve leakage hidden dangers of segmented lined vessels under long-term static storage.

Core Product Competitive Advantages

· Ultra High Corrosion Resistance Grade For Extreme Media Adopt imported high-density PTFE sheet with high molecular weight, stable against hydrofluoric acid, aqua regia, high-concentration chromate oxidizing liquid and fluorinated organic solvents, covering most ultra-corrosive working conditions that PFA spraying and PE lined tanks cannot bear.

· Integral Seamless Lining Without Welding Dead Corners Whole tank one-piece vacuum lamination technology, only tiny V-type weld at manhole position, greatly reduce medium seepage risk compared with spliced lining tanks, extend service life by 30% under fluorine medium storage.

· Wide Temperature & Pressure Adaptability Continuous working temperature range -190℃ ~ 260℃, stably adapt slight negative pressure closed storage, suitable for volatile high-corrosion liquid sealed stockpiling, no lining peeling under temperature fluctuation.

· Low Ion Precipitation High Purity Lining Ultra-smooth inner lining surface, Ra ≤0.3μm roughness, no medium adhesion residue, meet semiconductor electronic chemical and high-purity pharmaceutical raw material storage cleanliness requirements.

· Multi-Shape Customized Matching Design Vertical ground type, horizontal saddle type, conical bottom discharge type three optional structures, match indoor workshop, outdoor chemical park, automatic feeding production line different layout demands.

· Full Process Anti-Leak QC Control Every finished corrosion resistant storage vessel undergoes full-wall scanning spark test before delivery, 1.2 times design hydraulic pressure holding inspection, zero hidden leakage risk factory delivery.

Main Industrial Application Fields

This high-grade corrosion resistant storage vessel targets industries with ultra-aggressive raw material storage demands, with stable delivery records to Southeast Asia, Middle East fluorochemical and semiconductor factories:

Fluorochemical Industry: Hydrofluoric acid, fluorine salt raw material long-term sealed storage

Semiconductor Electronic Chemicals: High-purity etching liquid, fluorinated reagent buffer tank

Lithium New Energy: High-corrosion lithium salt electrolyte stock container

Fine Chemical Oxidation Workshop: Chromate, strong oxidizer liquid storage station

Rare Earth Metallurgy: Acid leaching high-corrosion intermediate holding tank

Pharmaceutical High-Purity Workshop: Fluorine-containing medical solvent storage

Environmental Hazardous Waste Treatment: Concentrated mixed acid waste liquid temporary storage

Operation Precautions

1.Medium Matching Limit: Only molten alkali metal and chlorine trifluoride will corrode PTFE lining, other corrosive liquids can be stored stably; do not inject unknown mixed fluorine-containing media without medium test report.

2.Temperature Control Requirement: Avoid rapid cold & hot temperature alternation in short time, temperature rise/fall speed shall not exceed 15℃ per hour to prevent lining thermal expansion delamination.

3.Pressure Operation Limit: Strictly prohibit over-negative pressure pumping, the maximum allowable vacuum degree is -0.07MPa, do not modify tank shell by welding after delivery.

4.Loading & Unloading Restriction: Do not use sharp metal pipes, iron bars to impact inner PTFE lining during feeding and discharging, avoid scratch damage.

5.Medium Liquid Level Limit: Liquid storage height shall not exceed 90% of tank total volume, reserve safe expansion space for temperature change.

6.Forbidden Additives: Do not add hard solid particles with high hardness into the tank, long-term friction will wear PTFE lining surface.

Standard Maintenance Guide

· Periodic Lining Inspection: Conduct full-wall 10KV spark leakage detection every 6 months, focus on manhole, nozzle and bottom welding positions to find tiny damage timely.

· Regular Tank Cleaning: After medium emptying, use compatible neutral solvent to clean inner wall residue, forbid steel wire brush and hard scraper cleaning.

· Flange Sealing Maintenance: Check PTFE gaskets of all flanges quarterly, replace aging deformed gaskets to avoid liquid seepage at connection parts.

· Temperature Monitoring: Record storage medium temperature daily, long-term over 200℃ continuous operation will shorten lining service life.

· External Shell Protection: Spray anti-rust paint on outer carbon steel shell every 2 years for outdoor placed vessels, prevent shell rust penetration.

· Spare Parts Management: Store matched PTFE lined gaskets and nozzles in warehouse, replace damaged accessories in time instead of ordinary metal parts.

FAQ

Q1: Can this PTFE Lined Corrosion Resistant Storage Vessel store high-concentration hydrofluoric acid long-term?

A: Yes, 5mm thick integral seamless PTFE lining can stably store HF medium for many years without penetration leakage.

Q2: Is the conical bottom tank available for automatic complete discharge of corrosive liquid?

A: We support customized conical bottom structure, matched PTFE lined discharge valve for full liquid emptying.

Q3: What is the maximum negative pressure the corrosion resistant vessel can bear during volatile liquid storage?

A: Stable operation under -0.07MPa micro negative pressure, do not use under deeper vacuum environment.

Q4: Can you provide medium compatibility test report before bulk order arrangement?

A: Free medium corrosion analysis and test data support for fluorochemical and semiconductor clients.