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FlexDrain EFR Flexible Drain Hose

Engineered to outlast standard tank drain hoses and reduce maintenance touchpoints.

FlexDrain™ is an advanced flexible drain hose system for External Floating Roof (EFR) storage tanks, designed for the realities that shorten hose life: abrasion, chemical exposure, and repeated flex cycles.

Same installation approach. Better durability. Lower lifecycle costs.

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Why FlexDrain?

Over-Engineered for Durability, Not Just Compliance

EFR drain service is governed by low operating pressure requirements. FlexDrain™ is engineered with a substantial structural safety margin beyond those requirements, so performance stays predictable over time, even as service conditions punish the hose.

It isn’t about operating at higher pressure. It’s about durability, resilience, and fewer unplanned replacements.​
  • Code-required working pressures are low in EFR drain service.
  • FlexDrain is structurally rated far beyond that—up to 75× the typical 30 PSI working pressure (based on a 2,250 PSI nominal rating).
  • With 4,500 PSI minimum burst, the safety margin extends even further—up to 150×.
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Solutions: Built for harsh tank service ​

  • Abrasion-resistant, anti-scratch exterior designed to reduce risk of tank floor and coating damage
  • Chemical resistance aligned with hydrocarbon tank environments, without narrow exclusions
  • Corrosion-resistant construction engineered for long service life

Applications: Where FlexDrain Hoses Fit

  • EFR storage tanks (petroleum and related service environments)
  • New construction and maintenance retrofits
  • Terminals, refineries, and midstream operations prioritizing reliability and predictable inspection intervals

Configurations: Sizes, lengths, and connections

  • Standard sizes: 3", 4", 6", and 8" ID
  • Lengths: 40’ to 80’+ (site-specific)
  • Connections: ANSI 150 RF flanges standard (ANSI 300 available)
Parameter 4" Hose 6" Hose
Pipe Inside Diameter
3.67 in
5.60 in
Pipe Outside Diameter
4.81 in
7.17 in
Operating Bend Radius
3.7 ft
5.2 ft
Weight (Empty)
8.51 lb/ft
17.84 lb/ft
Specific Gravity
1.06
1.02
Nominal Pressure Rating
2,250 psi
2,250 psi
Minimum Burst Pressure
4,500 psi
4,500 psi
Flange Options
ANSI 150/300
ANSI 150/300
Max Installation Tension
17,000 lb
30,000 lb
Design Temperature
195°F
195°F

FlexDrain EFR Hose Systems

Fewer Replacements at More Predictable Times​​

FlexDrain EFR hoses are built for tank drain service where low pressure hides high wear risk. By prioritizing structural margin, abrasion resistance, and chemical durability, FlexDrain delivers more predictable service life, fewer early failures, and reduced maintenance disruption, all without changing installation practices.

Timing & Warranty​
  • Delivered within 2 weeks of drawing approval (custom lengths and fittings) ​
  • 5-year standard warranty

Tell Us Your Application. We’ll Confirm the Fit.

Share your tank details (size, roof travel, routing constraints, commodity, and flange class). We’ll confirm fitment and provide quote + submittals.

Start with a no obligation technical conversation. Move forward only when the data supports it.