ENTR
Industrial storage tanks in black and white

Every ply on the load path.

Engineering for FRP tanks, pressure vessels, composite wings, radial fans, boat parts and vehicle chassis, and for the machines that build them. Calculated to code, built to schedule, certified for inspection.

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EN 13121 GRP tanks & vesselsASME RTP-1 reinforced thermoset equipmentBS 4994 vessels & tanksAPI 650 welded storage tanksEN 14015 site-built steel tanksEN 13445 unfired pressure vesselsDVS 2205 thermoplastic tanksEN 1998-4 seismic design of tanksISO 12215 small craft structuresEN 10204 3.1 inspection certificatesISO 12215-8 ruddersISO 12215-9 keels & appendagesISO 12215-10 rig loadsISO 5801 fan performance testingISO 21940-11 rotor balancingISO 8861 engine room ventilation
What we do

Five areas, one engineering team.

Each area has its own page with the services, standards and typical projects.

01 / 05

Tanks & vessels

FRP, steel and thermoplastic tanks to EN 13121, ASME RTP-1 and API 650, with load cases and tender documents.

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02 / 05

Composite structures

Wings, chassis and crash structures designed ply by ply, checked with FEA and built as prototypes.

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03 / 05

Marine

Rudders, masts, keels and hull panels to ISO 12215, plus radial composite fans.

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04 / 05

Machines & automation

Filament winding machines with our own software, waterjet cutters and EtherCAT automation.

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05 / 05

Training & quality

Laminator training and certification, test panels and EN 10204 3.1 documentation.

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The GUREN approach

For decades, tanks and composite parts were built from laminates copied from the last job. We start from the loads instead and place every ply where it carries them.

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Rule-of-thumb laminate
How it works

Composites are only strong where you point them.

Carbon fibre weave close-up
Steered reinforcement around a nozzle openingFIG. 02

Before engineering

A laminate copied from the last job.

Fibres carry load along their length and almost nothing across it. A generic lay-up wastes material in one place and leaves another short, usually right at the openings.

Load-path design

Each ply where it carries load.

We map the stresses first: hydrostatic head, wind, seismic and nozzle loads. Reinforcement builds up at openings and supports, and the shell gets lighter everywhere else.

Checked to code

Every component, every load case.

Strength, stiffness and buckling verified to EN 13121, ASME RTP-1 or API 650, by hand calculation and finite element analysis. The report names the governing case for each part.

Built right

A schedule the shop can follow ply by ply.

Drawings and a laminate schedule written for the shop floor, laminators trained to the same standard, and supervision during lay-up and cure.

PlyReinforcementOrientationt (mm)
1C-glass veil—0.3
2–3CSM 450 g/m²random2.0
4WR 800 g/m²0° / 90°0.8
5CSM 450 g/m²random1.0
6Hoop winding88°4.6
7Topcoat—0.3
Total9.0

Certified

The evidence before the inspector asks.

Test panels, hydrotest witness and an EN 10204 3.1 dossier, assembled as the job progresses rather than after it.

  • ✓Design calculation report
  • ✓Laminate schedule & drawings
  • ✓Laminator qualification records
  • ✓Test panel results (ISO 1172, EN 59)
  • ✓Hydrostatic test witness report
  • ✓EN 10204 3.1 certificate

How we operate. We take a tank or composite structure from the first load case to a certified, installed part: calculation, laminate design, drawings, training the people who build it, and the inspection dossier.

Vertical storage tanks against a blue sky
Vertical FRP storage tank · EN 13121
Sailing yacht mast and rigging from below
Composite mast & rig · ISO 12215-10
Our advantage

Engineering you can build from.

01

Lighter structures

Material goes where the load is. Shells get thinner and openings get stronger.

02

Fewer surprises at inspection

Reports written for the inspector, with the governing case for every component.

03

One partner

Calculation, drawings, training and certification from the same engineers.

End-to-end engineering

From brief to certificate in six steps.

Engage us for a single step, such as a calculation check, or for the full sequence through to acceptance.

  1. 01
    Engineer working on CAD drawings

    Brief & loads

    Operating conditions, stored medium, design life and the governing standard.

  2. 02
    Carbon fibre reinforcement

    Laminate design

    Resin system, reinforcement, ply schedule and liner selection.

  3. 03
    Simulation results on a workstation screen

    Calculation & FEA

    Strength, stiffness and buckling checks to standard, in a written report.

  4. 04
    3D design on a laptop

    Drawings

    General arrangement, details and the laminate schedule for the shop.

  5. 05
    Site engineer in a factory

    Supervision

    On-site checks during lay-up, cure and assembly.

  6. 06
    Row of finished storage tanks

    Test & certify

    Test panels, hydrotest witness and the final dossier.

Our clients have no margin for error.

Trusted by industry ↓

  • TeknoplasClient
  • Cenk EndüstriClient
  • OtostechClient
  • DearsanClient
  • MKEClient

Composite manufacturers, defence and naval industry and industrial fabricators across Türkiye.

Business model

We don't sell hours. We deliver a signed result.

Fixed-price packages

Standard tank calculations and design checks at a fixed price, with the deliverables agreed up front.

Engineering retainer

A composite engineer on call for fabricators and shipyards, on a monthly agreement.

Türkiye & United Kingdom

Domestic projects run from Türkiye. International projects and training contracts run through our UK company.

  • Laminate designed for this load case
  • Calculation, drawings and supervision in one place
  • Qualified laminators working to a written schedule
  • Inspection dossier built as the job progresses

The GUREN solution

Questions

Frequently asked questions

Can you check a design someone else made?

Yes. We run an independent check against the governing standard and return a report listing every non-conformity with a proposed fix.

Do you work with clients outside Türkiye?

Yes. International projects and training contracts run through our UK company, and all reports are available in English.

Contact

Build with GUREN.

Volume, stored medium, temperature and the standard you need to meet are enough for a first reply. We answer within two working days.

info@gurengineering.com
Engineering office, TürkiyeRegistered company, United Kingdom