Double Cylinder Testing

SCUBA TWINSET HYDROSTATIC TEST AND PERIODIC INSPECTION

Momodive provides a management service for the periodic inspection of scuba twinsets, consisting of two connected diving cylinders used as a double-cylinder configuration for technical, recreational or professional diving.

The service includes management of the inspection procedure and the hydrostatic testing of both cylinders forming the twinset. It is available for both CE marked cylinders (PED) and cylinders belonging to the category commonly referred to in Italy as the Old Fleet, generally consisting of non-CE marked cylinders manufactured before CE marking became widespread.

Each cylinder forming the twinset is identified and inspected individually according to the applicable procedure. This product therefore covers the inspection of both cylinders in one scuba twinset.

This service is provided in accordance with the regulations applicable in Italy to scuba cylinders inspected and certified within Italian territory.

Inspection Types Available for Scuba Twinsets

PED INSPECTION – CE Marked Cylinders
Italian Ministerial Decree 329/04

Twinsets consisting of CE marked cylinders follow the periodic inspection procedure established by the PED regulations applicable in Italy.

OLD FLEET INSPECTION – Non-CE Marked Cylinders
Italian Ministerial Decree 12-09-1925 – Royal Decree 12-05-1927 no. 824, Article 44

Non-CE marked cylinders follow a different inspection procedure and normally require longer processing times than PED cylinders. Any applicable surcharge is calculated for both cylinders forming the twinset and is shown in the selected product combination.

Before purchasing the service, please check the markings stamped on both cylinders. If you are unsure which inspection type applies, you may send us clear photographs of the markings for a preliminary assessment. For further information, please contact us.

Operations Included in the Double Cylinder Testing Service

• Management of the inspection procedure for both cylinders.
• Removal of the valves, when required.
• Preparation of both cylinders for inspection.
• Internal blasting and cleaning.
• Internal washing.
• Checks required by the applicable inspection procedure.
• Hydrostatic testing of both cylinders.
• Internal drying.
• Reinstallation of the valves, when supplied.
• Delivery of the required documentation upon completion of the procedure.

Valves, Manifold and Cylinder Bands

A scuba twinset normally consists of two cylinders, two valves, a central isolation manifold and cylinder bands. To reduce parcel weight, overall dimensions and the risk of transport damage, we recommend agreeing with us in advance whether the twinset should be delivered complete or partially disassembled.

If no servicing is required on the valves or manifold, it may be preferable to send only the two cylinders. If the complete twinset is delivered, removal and subsequent reinstallation of the valves can be managed as part of the service.

Before attempting to remove the valves, manifold or cylinder bands yourself, we recommend that you contact us, particularly if you do not have the correct tools or the necessary experience.

Estimated Turnaround Times

Twinsets with CE Marked Cylinders (PED)

• Twinsets are normally submitted for inspection on a weekly basis.
• Subject to operational changes, submission normally takes place on Monday.
• The twinset must reach our facility at least 2 working days before the planned submission date.
• Under normal circumstances, the cylinders are available for collection or return shipment by Wednesday of the following week.

Twinsets with Non-CE Marked Cylinders – Old Fleet

• The procedure normally requires longer processing times than the standard PED inspection.
• Please allow approximately 20 additional days compared with the normal turnaround time.

All turnaround times are estimates only and may vary depending on the availability of the authorities and authorized inspection centers involved, transport times and any additional checks required during the procedure.

Shipping a Scuba Twinset

Both cylinders must be completely empty and depressurized before shipment.

For safety and transport compliance reasons, diving cylinders must not be shipped while filled or pressurized.

The twinset may be delivered directly to our premises by selecting free in-store collection. Alternatively, the customer may arrange shipment independently or request a preliminary quotation for collection through one of our partner couriers.

Important: collection through our courier network is available only within Italy and is subject to verification of the collection area, parcel weight and package dimensions. Collection from addresses outside Italy cannot be arranged.

Courier Collection Service

Courier collection must not be booked before receiving confirmation from us. Once we have checked service coverage and the package specifications, we will provide the transport cost and the relevant instructions.

When the parcel is ready, we will arrange collection and send the shipping label, which must be printed and securely attached to the package.

• The twinset must be carefully packed and adequately protected for transport.
• Metal components must not be able to move freely inside the package.
• Collection is normally carried out between 09:00 and 18:00.
• A specific collection time cannot be agreed or guaranteed.
• Additional transport insurance may be requested separately.

Shipping Costs for Double Cylinders

Due to the weight and dimensions of a complete scuba twinset, transport costs must be checked and quoted in advance.

Before purchasing the service, please contact us and provide the collection or delivery location, the approximate parcel weight and the package dimensions.

We will verify service coverage with our transport providers and separately confirm the cost of any requested collection and return shipment.

Do you need to inspect several twinsets, stage cylinders or other diving cylinders? Please contact us before purchasing so that we can assess the most cost-effective transport solution.

Twinset Cylinders That Do Not Pass Inspection

The purchased service includes management of the inspection procedure, the required preliminary operations and submission of both cylinders for inspection.

The inspection outcome depends entirely on the condition of each individual cylinder and the requirements established by the applicable regulations. Because the two cylinders are assessed separately, one cylinder may pass the inspection while the other is declared unsuitable.

If one or both cylinders fail the inspection or are declared unsuitable for continued certification, no full or partial refund will be issued for the services already performed.

Shipping, collection, return transport, disassembly, reassembly and any other operations already completed are also non-refundable.

For Old Fleet cylinders, acceptance for inspection and the relevant processing times remain subject to the required checks. Any additional documentation or work required will be communicated to the customer whenever possible.

HYDROSTATIC TESTING OF BOTH CYLINDERS IN A SCUBA TWINSET

Double cylinder testing is not a single test performed on the complete assembled unit. Each of the two cylinders is identified and individually subjected to the checks and procedures required by the applicable inspection system.

It is therefore important to check the markings on both cylinders. In some twinsets, the cylinders may have different manufacturing years, previous inspection dates or technical specifications.

This service is available to recreational and technical divers, dive centers, diving schools, sports associations, diving clubs and professional operators throughout Italy.

Frequently Asked Questions About Double Cylinder Testing

Does the price include the inspection of both cylinders?

Yes. The double cylinder testing service covers management and submission for inspection of both cylinders that make up the scuba twinset.

Are both cylinders inspected together?

The equipment is managed as one twinset, but each cylinder is individually subjected to the required checks. The inspection result may therefore be different for each cylinder.

What happens if only one cylinder fails the inspection?

The cylinders are assessed individually. One cylinder may therefore pass while the other is rejected. In this situation, no partial refund is available for the inspection work already carried out.

How can I determine whether both cylinders are CE marked?

You must check the markings stamped on the body of each cylinder. If you are unsure, send us clear photographs of both sets of markings for a preliminary assessment.

Can I ship the twinset fully assembled?

Yes. However, because of its weight, size and the risk of transport damage, we recommend contacting us before shipment. We will help determine whether it is preferable to send the complete twinset or only the two cylinders.

Must both cylinders be completely empty?

Yes. Both cylinders must be completely empty and depressurized before shipment. Filled or pressurized cylinders must not be shipped.

Can I request collection from my address?

Collection can be arranged only after checking the service coverage, package weight and dimensions. You must therefore contact us before preparing or handing the parcel to the courier.

When are CE marked twinsets normally submitted for inspection?

Subject to operational changes, twinsets with CE marked cylinders are normally submitted for inspection on Monday. To be included in the planned session, they must reach us at least 2 working days beforehand.

How long does double cylinder testing take?

For twinsets with CE marked cylinders, availability is normally expected by Wednesday of the week following submission. For Old Fleet cylinders, approximately 20 additional days should be allowed.

Can I request collection outside Italy?

No. Collection through our partner courier network is available exclusively within Italy.

Is the inspection certificate valid outside Italy?

The inspection is carried out according to the regulations applicable in Italy. Customers are responsible for verifying whether the certification is accepted by the local authorities, filling stations or diving operators in their own country.