Twinset Hydrostatic Cylinder Test and Valve Service
Complete 5‑year hydrostatic test and valve service for twinset cylinders. Includes full pressure testing, internal/external inspection, valve clean and rebuild, and official UK certification to keep your dive setup safe and compliant
Discounts For Clubs & Schools
We offer group discounts on multiple items for clubs or schools and we can also collect and drop off your school / club bulk servicing (minimum of 10 items) as well. Please feel free to contact us to book your kit in for a service.
Keep your twinset cylinders fully compliant and performing at their best with our Hydrostatic Cylinder Test and Valve Service, available at Diving Academy, your trusted Cylinder Testing & Servicing Centre covering Swindon, Reading, Bristol, Oxford, Basingstoke, Bracknell, and Cheltenham.
In the UK, scuba cylinders must undergo a hydrostatic pressure test every 5 years to ensure the tank can safely hold compressed air. For twinsets, this inspection is carried out on both cylinders and manifold valves, making sure your entire setup meets safety and diving standards.
What’s included in our Twinset Hydrostatic Test & Valve Service:
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Hydrostatic Pressure Test (5‑Year Inspection):
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Each cylinder is filled and pressurised to test structural integrity
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Internal inspection for corrosion, pitting, or moisture damage
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External check for dents, scrapes, and thread wear
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Full Twinset Valve Service:
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Complete disassembly and ultrasonic cleaning
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O‑ring replacement and lubrication with oxygen‑compatible grease
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Leak testing and smooth operation check
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Official Test Stamp & Documentation:
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Your twinset is certified for UK and international filling stations
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Regular hydrostatic testing and valve servicing is essential for technical divers and twinset users, keeping equipment safe, reliable, and ready for deep or extended dives.
Diving Academy provides authorised cylinder testing and professional valve servicing, conveniently located for divers, dive centres, schools and dive clubs across:
Swindon • Reading • Bristol • Oxford • Basingstoke • Bracknell • Cheltenham
Book your Twinset Hydrostatic Cylinder Test & Valve Service today and ensure your equipment meets the highest UK diving safety standards.
Testing Requirements
Scuba Diving Cylinders
Every cylinder that’s used for Scuba diving (or compressed gases) should be tested and inspected periodically. A hydrostatic test needs to be carried out every 5 years and a visual test needs to be undertaken every 2½ years.
If the cylinder is to be used for Oxygen/Enriched Air, the cylinder should be O2 cleaned, which needs to be undertaken every 15 months. Certificates will be supplied following the cylinder Visual and Hydrostatic Inspections along with IDEST cylinder stamping.
Surface Use Only
Cylinders used for surface use only – i.e. BA, Airgun and Paintball cylinders need to be tested every 5 years. If a cylinder has a diving compatible valve in must be tested as a diving cylinder as it could always be used in seawater for the purpose of Scuba, unless it’s fitted with a surface use only valve.
All Cylinders
All attachments, lifting bars, handles, straps, wings, backplates and bungee cords should be removed before submitting your cylinders for testing, due to corrosion on some of these items removing them can take time which may incur a small charge for our time.
If a cylinder fails the test it will be destroyed.
IDEST Information
- BS EN ISO 18119:2018, +A1:2021 Steel and Aluminium; or BS EN 11623:2015 (Composite) ASSET CP11:2022
- Valves have been serviced to BS EN ISO 22434:2022
Our cylinder testing is carried out by independently trained IDEST technicians to standards set out by the HSE. All work is carried out to manufacturer’s specifications using genuine parts by manufacturer and ASSET trained servicing personnel.
Diving Academy Services, currently trading as DM Scuba Services testing facility is periodically inspected by IDEST engineers to make sure the methods and statements laid out in our documentation are adhered to. Our engineers are also periodically assessed in their competence. Feel free to ask each engineer for their certification as well as the centre documentation.
Servicing times do vary but we aim to have your equipment serviced and returned to you within two weeks. However, this time may increase if parts are unavailable or if demand for servicing is unusually high during the peak seasons of the dive calendar.
Please advise us in advance should you require a faster turnaround time.
Certificates will be supplied following Cylinder Visual and Hydrostatic Inspections and Non Destructive Aluminium testing along with IDEST cylinder stamping.
Please Note:
- Cylinders for surface use ie Charging Airguns and Paintball Cylinders need to be tested every 5 years, dependant on valve;
- Our policy is that a cylinder with a diving valve in must be tested as a diving cylinder as it could always be used for the purpose of SCUBA, unless fitted with a surface use valve
Please Note:
Equipment brought into the shop for servicing or testing, not collected within three months of notification of completion of works, Diving Academy Services will have the right to sell the equipment to re-coup the expense incurred for the repair / service / test, at their own discretion.
Diving Academy Services is approved by all our suppliers to carry out servicing on their products, and we will only use genuine parts and service packs to ensure this does not invalidate your warranty.
If you use unauthorised technicians who are NOT approved by suppliers, this could invalidate your warranty.
