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ISO 13628-5 super-duplex stainless steel tube umbilical (STU)ISO 13628-5 / API Spec 17E10,000–15,000 PSI SDSS0.6/1 kV & 6/10–18/30 kV

SURF ISO 13628-5 / API 17E Super-Duplex Steel Tube Umbilical (STU)ISO 13628-5 / API 17E · 6/10 kV · Iso 13628-5 super-duplex stainless steel tube

SURF ISO 13628-5 / API Spec 17E Super-Duplex Stainless Steel Tube Umbilical (STU) for Subsea Chemical Injection, Hydraulic Control, Gas Lift & Electro-Optical Transmission (ISO 13628-5 / API 17E, 6/10 kV, -20 °C to +90 °C).

Water-resistant

EMC screen

Oil-resistant

Approved

Configuration

Order designation: SURF SUPER-DUPLEX STU 3×240 mm² + FO
Outer Ø ≈: 118.0 mm
Net weight ≈: 26,400 kg/km
Tensile rating ≈: 320.0 kN
Core / stranding: IEC 60228 Class 2 water-blocked Cu

All sizes (3)

Request a quote Datasheet WhatsApp info@tebaoflex.com

Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum

Rated voltage: 6/10 kV
Operating temp.: −20…+90 °C
Min. bend radius: 15 × OD
Core / conductor: UNS S32750 Tubes
Outer protection: SWA
Standard: ISO 13628-5

Typical values for this cable type, based on ISO 13628-5 / API Spec 17E Super-Duplex STU Standard — confirmed in the datasheet and quotation for your order.

Application fit

Is SURF SUPER-DUPLEX STU right for your machine?

Immersion & wet locations

Suitable

Water-blocked core matrix and hydrolysis-resistant subsea jacketing withstand continuous deepwater hydrostatic pressure.

Vertical / spreader reel

Suitable

Torque-balanced aramid or contra-helical steel armour supports vertical winch deployment without hockling.

Offshore platform & shipboard deck trays

Suitable

Marine-grade outer sheath and armour package resist LARS sheave abrasion, UV exposure and salt-spray corrosion.

Trailing & towing

Suitable

High tensile breaking strength supports underwater towing, ROV excursion and seabed plough/trencher duty.

Energy chain / drag chain

Not suitable

Subsea umbilical and tow construction is not intended for high-cycle indoor factory drag chains.

Use Drag-Chain Servo Cable

Typical machinesMarine & Offshore CableWork-Class & Observation ROV SystemsOffshore Wind & Subsea Power GridsOceanographic, Sonar & Seismic SurveyCommercial Diving & Subsea Intervention

Construction

Layer by layer

Shown: SURF SUPER-DUPLEX STU (ISO 13628-5 / API Spec 17E Super-Duplex STU Standard) featuring center meg / chemical injection tube, 15,000 psi sdss hydraulic tubes (6×) and galvanized steel armour & hdpe sheath (5-layer construction).

Schematic, not to scale — generated from the layer data

#	Layer	Material & reference
1	Center MEG / Chemical Injection Tube	Large-bore Super-Duplex Stainless Steel (UNS S32750) tube with PE/PA11 oversheath
2	15,000 PSI SDSS Hydraulic Tubes (6×)	Cold-drawn UNS S32750 tubes (Rp0.2 ≥ 550 MPa) with individual polymeric oversheaths
3	Control Quads & Armoured FO Cables	4 × 0.6/1 kV screened XLPE control quads + 2 × armoured single-mode optical cables
4	Pre-Shaped Polymeric Profile Fillers	Extruded grooved PVC/PE profile fillers locking tubes and cables in exact geometry
5	Galvanized Steel Armour & HDPE Sheath	Helically wound galvanized steel armour + black/yellow HDPE outer jacket

SURF SUPER-DUPLEX STU — Standard Subsea & Marine Execution

Built to ISO 13628-5 / API Spec 17E Super-Duplex STU Standard with center meg / chemical injection tube and galvanized steel armour & hdpe sheath

SURF SUPER-DUPLEX STU — Custom Drum Length & Termination Kit

Available in custom continuous subsea/wellbore drum lengths or pre-terminated assemblies

SURF SUPER-DUPLEX STU — Routine & Hydrostatic Test Certified

Supplied with EN 10204 3.1 routine dielectric, resistance & pressure/dimensional report

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on ISO 13628-5 / API Spec 17E Super-Duplex STU Standard. Values for your order are confirmed in the datasheet and quotation.

Electrical

Rated voltage / transmission duty: 6/10 kV (ISO 13628-5 / API Spec 17E Super-Duplex STU Standard)
Core / conductor construction: Center MEG / Chemical Injection Tube — Large-bore Super-Duplex Stainless Steel (UNS S32750) tube with PE/PA11 oversheath
Primary dielectric / buffering: 15,000 PSI SDSS Hydraulic Tubes (6×) — Cold-drawn UNS S32750 tubes (Rp0.2 ≥ 550 MPa) with individual polymeric oversheaths

Thermal

Continuous operating temperature: −20…+90 °C (subsea, marine & submersible duty)
Short-circuit / peak thermal rating: Verified thermal stability per ISO 13628-5 / API Spec 17E Super-Duplex STU Standard
Storage & transport temperature: −40…+80 °C on export wooden/steel drum

Mechanical

Outer protection / armouring: Galvanized Steel Armour & HDPE Sheath — Helically wound galvanized steel armour + black/yellow HDPE outer jacket
Minimum bending radius: 15 × OD
Hydrostatic, tensile & crush duty: Pre-Shaped Polymeric Profile Fillers — Extruded grooved PVC/PE profile fillers locking tubes and cables in exact geometry

Resistance

Hydrostatic pressure & water blocking: Engineered for continuous submersion and hydrostatic integrity per ISO 13628-5 / API Spec 17E Super-Duplex STU Standard
Seawater, oil & chemical resistance: Resistant to seawater hydrolysis, hydraulic oils and abrasion per ISO 13628-5 / API Spec 17E Super-Duplex STU Standard
RoHS & REACH compliance: RoHS 2 (2011/65/EU + 2015/863) & REACH SVHC compliant

Reference standards

Governing standard: ISO 13628-5 / API Spec 17E Super-Duplex STU Standard
Environmental & test standards: IEC 60228 / IEC 60332 / ISO 13628-5 / EN 10204
Quality management & inspection: ISO 9001:2015 & EN 10204 3.1 factory routine inspection

Identification

Model designation: SURF SUPER-DUPLEX STU
Sheath colour & metre marking: Continuous metre-marked black outer finish (SWA + Black/Yellow HDPE)
Customs tariff (HS): 8544.49 / 8544.60 / 8544.70

Sizes

3 standard SURF SUPER-DUPLEX STU subsea & marine configurations

Manufactured to ISO 13628-5 / API Spec 17E Super-Duplex STU Standard for subsea, offshore, deep-well and marine applications.

Dimensions, tensile load & weights
Order designation	Configuration	Core / stranding	Outer Ø ≈ mm	Net weight ≈ kg/km	Tensile rating kN ≈	Min. bend R mm
SURF SUPER-DUPLEX STU Construction Schedule (−20…+90 °C)
SURF SUPER-DUPLEX STU 3×240 mm² + FO	3 × 240 mm² + 48F FIMT	IEC 60228 Class 2 water-blocked Cu	118.0	26,400	320.0	1,770
SURF SUPER-DUPLEX STU 3×400 mm² + FO	3 × 400 mm² + 48F FIMT	IEC 60228 Class 2 water-blocked Cu	134.0	34,800	420.0	2,010
SURF SUPER-DUPLEX STU 3×630 mm² + FO	3 × 630 mm² + 96F FIMT	IEC 60228 Class 2 water-blocked Cu	152.0	46,200	560.0	2,280

Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
Custom core cross-sections, pair/fibre counts, armour grades and factory drum lengths available per ISO 13628-5 / API Spec 17E Super-Duplex STU Standard.

Electrical, optical & thermal parameters
Configuration	Max. DC R₂₀ / Atten. Ω/km or dB/km	Rating / Impedance	Operating temp.
3 × 240 mm² + 48F FIMT	0.08	6/10 kV (560 A)	−20…+90 °C
3 × 400 mm² + 48F FIMT	0.05	6/10 kV (710 A)	−20…+90 °C
3 × 630 mm² + 96F FIMT	0.03	6/10 kV (890 A)	−20…+90 °C

Every production length undergoes routine conductor DC resistance, high-voltage dielectric or OTDR continuity and dimensional verification.

Quality & approvals

Testing & inspection

Routine tests on every production length, sample and type tests per batch — documented on an EN 10204 3.1 inspection certificate.

ConductorClass 5 stranding
Spark test100 % in-line
Lay-upCores, earth, fillers
SheathingInner, braid / screen, outer
Electrical testsAC voltage, resistance
DimensionsOD, wall thickness
Inspection documents & dispatchDrum & dispatch

Testing & inspection	Test value / reference	Frequency
Routine tests
Conductor resistance, continuity & dimensional verification (ISO 13628-5 / API Spec 17E Super-Duplex STU Standard)	DC resistance at 20 °C / optical attenuation and outer diameter within ISO 13628-5 / API Spec 17E Super-Duplex STU Standard tolerances	Every manufactured drum length
High-voltage dielectric & insulation resistance test (ISO 13628-5 / API Spec 17E Super-Duplex STU Standard)	Zero dielectric breakdown and verified insulation resistance for 6/10 kV rating	Every manufactured drum length
Sample tests
Hydrostatic pressure, water-blocking & mechanical endurance qualification (ISO 13628-5 / API Spec 17E Super-Duplex STU Standard)	Verified submersion integrity, tensile load and thermal stability across −20…+90 °C	Type qualification & periodic lot audit

Inspection certificate

Issued with every drum, listing the routine test results for that length.

Product approvals

ISO 13628-5 / API 17E CompliantEN 10204 3.1 Factory Test CertificateCE, RoHS 2 (2011/65/EU) & REACH

Company certificates

ISO 9001ISO 14001ISO 45001VDE marks approvalUL / cULCE · LVD / EMC

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX SURF SUPER-DUPLEX STU ISO 13628-5 / API 17E 6/10 kV CE

Delivery form: Heavy-duty export fumigated wooden drums or steel subsea reels
Standard lengths: 500 m, 1,000 m or custom continuous subsea/wellbore lengths
MOQ: 100 m (standard configurations) · 500 m (custom builds)
Lead time: 2–5 weeks ex-works
Incoterms: EXW, FCA, FOB, CIF, DAP

Technical documents

Downloads

PDFSURF ISO 13628-5 / API 17E Super-Duplex Steel Tube Umbilical (STU) – technical datasheet3 sizes · construction, technical data, approvals XLSXSURF SUPER-DUPLEX STU spec data (Excel)All 3 sizes with dimensions and data, for your BOM or quotation

Revision: 2026-10-25
Updated: 2026-10-25

FAQ

Questions engineers ask first

Not covered here? Send your drawing — an engineer replies within 2 business hours.

What governing standard and construction define SURF SUPER-DUPLEX STU (SURF ISO 13628-5 / API 17E Super-Duplex Steel Tube Umbilical (STU))?

SURF SUPER-DUPLEX STU (SURF ISO 13628-5 / API 17E Super-Duplex Steel Tube Umbilical (STU)) is manufactured in accordance with ISO 13628-5 / API Spec 17E Super-Duplex STU Standard for 6/10 kV service over -20 °C to +90 °C. Its 5-layer construction comprises center meg / chemical injection tube, 15,000 psi sdss hydraulic tubes (6×) and galvanized steel armour & hdpe sheath.

What is the minimum bending radius and operating temperature range for SURF SUPER-DUPLEX STU?

The minimum bending radius for SURF SUPER-DUPLEX STU is 15 × OD across its continuous operating temperature range of -20 °C to +90 °C, ensuring mechanical and dielectric reliability in subsea, marine and submersible service.

How are the concentric layers of SURF SUPER-DUPLEX STU arranged from inside to outside?

From inside to outside, the construction sequence is: (01) Center MEG / Chemical Injection Tube — Large-bore Super-Duplex Stainless Steel (UNS S32750) tube with PE/PA11 oversheath; (02) 15,000 PSI SDSS Hydraulic Tubes (6×) — Cold-drawn UNS S32750 tubes (Rp0.2 ≥ 550 MPa) with individual polymeric oversheaths; (03) Control Quads & Armoured FO Cables — 4 × 0.6/1 kV screened XLPE control quads + 2 × armoured single-mode optical cables; (04) Pre-Shaped Polymeric Profile Fillers — Extruded grooved PVC/PE profile fillers locking tubes and cables in exact geometry; (05) Galvanized Steel Armour & HDPE Sheath — Helically wound galvanized steel armour + black/yellow HDPE outer jacket.

What factory test certificates are supplied with SURF SUPER-DUPLEX STU?

Every production drum of SURF SUPER-DUPLEX STU undergoes routine conductor resistance/continuity, high-voltage dielectric and dimensional testing per ISO 13628-5 / API Spec 17E Super-Duplex STU Standard, and is delivered with an EN 10204 3.1 factory test certificate.

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03Message for our engineers

SURF ISO 13628-5 / API 17E Super-Duplex Steel Tube Umbilical (STU)

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