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Custom-Engineering & Bespoke Design
We offer custom engineering and bespoke design for bellows and expansion joints tailored to your unique specifications. Our team provides advanced design, materials expertise and precision fabrication for demanding environments. From simple to complex, vacuum to high-pressure, cryogenic to high-temperature, small diameter or very large, thin or multi-ply or thick-wall, we deliver engineered-to-order expansion joint solutions optimised for safety, durability and performance.
Call us • Contact sales • Consult an engineer • Choose FastTrack for urgent orders
Why You Need Custom-Engineering
For most of our customers, browsing a catalogue of standard range products is not enough – that is why we specialise in custom-engineering designs specific to your needs, whether:
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Your movements are unusual, combined or not fully defined yet;
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Your envelope is constrained, or installation access is limited;
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The duty is fatigue‑critical, high integrity or safety‑critical;
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You need material selection confidence for aggressive environments;
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Or you need an engineered solution that aligns with inspection, testing and documentation expectations.
If your requirement needs specially-tailored engineering judgement and verification - not just a catalogue selection – this is the right starting point.
What We Can Engineer & Design
We provide bespoke design support across bellows and expansion joint solutions, including:
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Metal bellows or expansion joints - formed or welded, selected to match duty, designed for universal, axial, lateral or angular movement requirements;
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Metal pipework - without bellows if you need it for your pipeline;
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Metal flexible hoses - instead of bellows for solutions that require less intensity but more flexibility;
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Non-metallic bellows - such as rubber, fabric or PTFE units, for specific environmental or media-related duties;
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High integrity and severe duty configurations - including thick‑wall approaches where required;
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Large and complex assemblies - where geometry, handling and installation need to be engineered up-front;
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Harsh duty solutions - spanning vacuum and high-pressure, cryogenic and high-temperature service;
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Emergency replacements or repairs - such as replacement parts, or temporary and easy-to-install measures such as clam-shell bellows.
Where the best solution sits across multiple disciplines (design, fabrication, inspection), we align the design intent early so the manufactured component meets real-world installation and operating conditions.
Engineered Solutions We Provide
Movement & Vibration
We can design for any movement your pipeline may be subject to:
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Axial movement from expansion or contraction;
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Lateral offsets from routing constraints or settlement;
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Angular rotation from structural deflection;
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Universal movement for the most flexible pipelines;
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Extreme vibration dampening if necessary.
Media & Environment
We can design your joints to handle anything both inside and outside your pipeline:
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Extreme internal media, such as caustic or corrosive chemicals;
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Extreme external environment, like offshore, subsea, underground, aerospace, et cetera.
Fatigue Life & Reliability
Where cycling, pulsation or vibration drives fatigue, we focus on:
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Stress range control through geometry and construction choices;
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Cycle expectations and duty profiles;
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Features that reduce common failure drivers (misalignment, over‑travel, turbulence effects).
Pressure & Temperature
We can design expansion joints to withstand the most extreme temperatures and pressures:
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Hyperbaric pressure to full vacuum;
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Extreme temperature to cryogenic temperature;
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Repetitive thermal cycling or pressure cycling.
Duty & Load
We can design bellows that can endure the extreme forces that your pipeline may undergo:
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Combined movement cases and installation misalignment allowances;
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Acceptable loads at anchors, guides and equipment nozzles (where applicable).
Materials & Duty Compatibility
We support selection aligned to:
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Temperature profile and transients;
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Pressure and pressure cycling;
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Environment and corrosion risk;
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Long-term durability expectations (including maintenance realities).
How The Bespoke Design Process Works
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Rapid technical intake
You send what you have: drawings, specifications, duty conditions, photos, constraints, failure history (if replacing).
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Feasibility and concept selection
We confirm whether the design is in our capability, then the most appropriate approach for duty, envelope and movement pattern, as well as pricing.
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Design definition and interfaces
We align connection details, envelope, installation constraints, and movement assumptions.
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Verification pathway (where needed)
For fatigue‑critical or high integrity duties, verification can include structured review and analysis support (for example, using FEA where appropriate).
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Manufacture, testing and release aligned to your specification
We build the design into a practical manufacturing and inspection plan, aligned to required documentation and release expectations.
What We Need To Design Your Product
To move efficiently from concept to quotation, send:
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Line size and available envelope;
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Operating and design pressure;
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Operating and max temperature (include transients where relevant);
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Media (and any contaminants or special requirements);
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Required movement (axial, lateral, angular) and expected cycle duty;
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Connection and interface details (flanges, weld ends, mating standards);
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External environment factors (outdoor, marine, corrosive exposure, restricted access);
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Any mandatory inspection, testing, approvals and documentation requirements.
If you do not have movements quantified, send your layout or photos and the operating conditions. We will help define what is needed to proceed safely.
FAQs About 'Custom-Engineering & Bespoke Design'
When should I choose custom engineering instead of a standard range solution? Choose bespoke design when duty, envelope, movements, verification requirements or environment make a standard configuration unsuitable, or when you need engineering validation before manufacture.
Can you design for vacuum, high pressure, cryogenic and high temperature service? Yes. Our bespoke service covers severe duty ranges, including vacuum and high pressure, and cryogenic through high temperature applications.
What is the fastest way to start a bespoke design request? Send your drawing or sketch plus pressure, temperature, media and movement requirements. If you are replacing a failed part, include photos and any failure notes.
Do you support very large assemblies and unusual envelopes? Yes. The service includes small diameter through very large engineered solutions.
Who do I contact for design help and quotations? For design help email eng@tes.uk.com. For quotations email sales@tes.uk.com, or call +44 (0)1554 744500.
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