Frequently Asked Questions

At least once every 12 months to check its integrity.

No, except in specialised configurations such as a V or U style assembly

Yes , our technical sales team can calculate the lengths required to achieve this , or use our online calculation tool.

Yes we can supply laser etched details including company logo if required on braid ferrules or sliding ring on hose.

Yes full traceability can be provided along with pressure test certification if required.

Yes ASME 1X welder qualification and  BS9606-1.

Standard pitch up to 8,000 cycles and close pitch up to 50,000 cycles.

Overall length including fittings , Cut piece of hose and Live length in between the braid ferrules.

Extreme temperatures – 200 c to 600 c Fire resistance , Full vacuum , Corrosion resistance and Permeability .

Approx. 4-5 times more than a smooth pipe of the same size.

150 feet per second Gas or 75feet per second Liquid , if in a straight hose , velocity above these figures the hose will require an interlock internal liner.

Metal hoses have a considerable life span when compared with rubber hoses , I certain applications they can last up to 20 years depending on working conditions.

Yes, our technical sales team can advise.

This refers to the rated working pressure in our catalogue and burst pressure being 4 times the working pressure therefore a 4-1 safety factor built into the figures

Yes, they will require exotic materials either in Inconel rated up to 920C or Hastelloy up to 815C, please ask our technical sales for details.

Yes , pressure pulsations will effect the life of the assembly as the braiding can wear through the convolutions in time.

Yes, this depends on the amount of vibration , severe vibration causes the hose to fail due to the braiding sawing through the hose convolutions.

No, the hose will elongate instead.

Approximately 3% to 5% of the length this depends on the type of outer braid and if it has been machine braided or hand braided

Yes, standard assemblies can already be supplies with 2 braids, adding a third braid will increase its rating by approx. 15% adding further braids will not increase the rating any further a heavier hose with close pitch will be required instead .

Standard assemblies are TIG welded in accordance with ISO 10380 and cycle life is published in accordance with the specification. Welding using a different technique will not improve the cycle life of the assembly , but it will improve its potential lifespan.

The latest welding techniques heat the braids less, this eliminates braid embrittlement which can cause the braids to pull out of the ferrule resulting in premature failure at higher pressures. Fully argon backing of welds stops the last convolution from rusting therefore enhancing the corrosion resistance of the whole assembly.

As standard 100% of our hoses are tested in accordance with ISO10380:2012, unless otherwise stated. We can also offer high pressure testing or helium testing if required.

Our hose assemblies are manufactured in accordance with ISO10380:2012. Flexmetallic is also an ISO9001 certified company.

Yes there can be significant changes in pressure rating at elevated temperatures. Please see our pressure / temperature correction factor chart or contact sales office for advice.

In general assemblies are made to order and within reason can have almost any fitting attached. We do also have a standard range of common fittings available off the shelf.

The burst pressure (BP) is the pressure at which the hose would burst. Metallic hose is manufactured with a 4:1 safety factor– please also see safety factor reference.