{"id":6881,"date":"2026-11-10T04:45:39","date_gmt":"2026-11-10T04:45:39","guid":{"rendered":"https:\/\/www.henghuahose.com\/?p=6881"},"modified":"2026-11-10T04:45:41","modified_gmt":"2026-11-10T04:45:41","slug":"composite-hose-inner-wire","status":"publish","type":"post","link":"https:\/\/www.henghuahose.com\/fr\/composite-hose-inner-wire\/","title":{"rendered":"Composite Hose Inner Wire: Vacuum Collapse and Corrosion"},"content":{"rendered":"<p>The composite hose inner wire is the steel helix that runs inside the bore, and it does two jobs at once. It holds the bore round against vacuum and crush, and it gives the assembly a conductive path through the wall. When that wire is weakened, the hose does not leak first. It flattens, and a flattened hose is finished.<\/p>\n\n\n\n<p>Two failure paths matter. A helix that is under-specified for the vacuum collapses the bore in stages, from oval to kink. A helix that corrodes loses stiffness before it loses shape, so the collapse arrives later and with less warning. This article covers both, the wire materials the standard allows, the vacuum figures behind the rating, and the checks that catch a weakening helix before a suction line goes flat.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/composite-hose-inner-wire-hero.jpg\" alt=\"Cut-away end of a composite hose with the internal steel helix, thermoplastic film, woven fabric and cover exposed\" class=\"wp-image-6863\" srcset=\"https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/composite-hose-inner-wire-hero.jpg 800w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/composite-hose-inner-wire-hero-300x225.jpg 300w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/composite-hose-inner-wire-hero-768x576.jpg 768w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/composite-hose-inner-wire-hero-16x12.jpg 16w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/composite-hose-inner-wire-hero-600x450.jpg 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p>Figure 1. A sawn hose end with the internal steel helix exposed, showing the wall layers built over it.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"what-does-the-composite-hose-inner-wire-do\">What Does the Composite Hose Inner Wire Do?<\/h2>\n\n\n\n<p>Four things, and each one explains a failure mode.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>It resists external pressure. Under vacuum, the atmosphere pushes the wall inward and the helix is the only structure with the stiffness to stop it.<\/li>\n\n\n\n<li>It resists crush. A hose run over by a truck or stepped on at a rack keeps its bore because the helix springs back.<\/li>\n\n\n\n<li>It sets the bend behaviour. The helix pitch decides how tightly the hose bends before the wall folds on itself.<\/li>\n\n\n\n<li>It carries current. Bonded at both fittings, the wire is part of the static path through the assembly.<\/li>\n<\/ul>\n\n\n\n<p>The helix is not a liner. It sits in the bore and the product flows around it, which is why the wire material is a chemical decision as well as a structural one. A composite hose inner wire chosen for strength alone is the most common specification error we see on acid duty.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"how-is-the-wire-specified-in-the-standard\">How Is the Wire Specified in the Standard?<\/h2>\n\n\n\n<p>EN 13765 allows three material routes for the internal and external wire, and each one suits a different service.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Stainless steel wire to EN 10088-3, in grades 1.4306, 1.4401, 1.4404 or 1.4436. This is the default for chemical and marine service.<\/li>\n\n\n\n<li>Carbon steel wire, either galvanised or sheathed in a polymeric layer of at least 0.5 mm wall thickness, resistant to the product being carried.<\/li>\n\n\n\n<li>Aluminium wire to ISO 209, used where weight or cost matters and the product allows it.<\/li>\n<\/ul>\n\n\n\n<p>The standard also points the buyer at its chemical resistance annex when selecting the wire. It also requires the manufacturer to be consulted when a polymer-coated internal wire is proposed for low conductivity products. That note exists because a coated wire insulates the helix from the product, which changes both the corrosion risk and the conductive path.<\/p>\n\n\n\n<p>A sheath is not decoration. The 0.5 mm minimum wall is the difference between a wire that survives a mildly acidic product and one that starts to rust under its own coating within a season.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"what-vacuum-does-a-composite-hose-hold\">What Vacuum Does a composite hose Hold?<\/h2>\n\n\n\n<p>The standard gives a vacuum rating for each type, and the figure is a pressure difference rather than an absolute pressure.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Type<\/th><th>Vacuum rating<\/th><th>Pression de service<\/th><th>Service<\/th><\/tr><\/thead><tbody><tr><td>Type 1<\/td><td>0.5 bar<\/td><td>4 bar<\/td><td>Vapour recovery and vapour lines<\/td><\/tr><tr><td>Type 2<\/td><td>0.9 bar<\/td><td>10 bar<\/td><td>Liquid chemical and petroleum transfer<\/td><\/tr><tr><td>Type 3<\/td><td>0.9 bar<\/td><td>14 bar<\/td><td>Higher pressure liquid transfer<\/td><\/tr><tr><td>Type 4<\/td><td>0.9 bar<\/td><td>14 bar<\/td><td>High temperature liquid transfer to +150 \u00b0C<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><em>Table 1. composite hose vacuum ratings by type, from the EN 13765 pressure and temperature table. A rating of 0.9 bar is most of a full vacuum, leaving roughly 0.1 bar absolute inside the bore.<\/em><\/p>\n\n\n\n<p>The test behind the rating is a 30 minute hold at the rated vacuum with no damage, carried out to EN ISO 7233 method B. It is a type test on a new hose, so it proves the design rather than the hose in your rack.<\/p>\n\n\n\n<p>Three practical points follow. A Type 1 vapour hose is rated to half a bar, not to full vacuum, so it is the wrong choice for a suction drop leg. The composite hose vacuum rating is a pressure difference rather than an absolute pressure, so 0.9 bar means roughly 0.1 bar left inside the bore. A hose that has been kinked once no longer holds its rated vacuum, because the fold has yielded the helix. And a suction line that runs dry at the end of a discharge pulls a deeper vacuum than the transfer duty ever does, which is when a marginal helix gives way.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"why-does-a-bore-collapse-in-stages\">Why Does a Bore Collapse in Stages?<\/h2>\n\n\n\n<p>A composite hose vacuum failure is progressive, and the stages look different on inspection.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>The section ovalises. External pressure exceeds what the helix can hold locally, and the round section becomes an ellipse. A hose at this stage still flows, at a reduced rate.<\/li>\n\n\n\n<li>The wall folds at the flat. The film and fabric crease along the long axis of the ellipse, and the crease is a permanent deformation in a thermoplastic wall.<\/li>\n\n\n\n<li>The bore kinks shut. The helix pitch closes on one side, the flow stops, and the hose cannot be straightened by hand.<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/composite-hose-inner-wire-collapse.jpg\" alt=\"Hose with a flattened oval section collapsed mid-length on a workshop floor\" class=\"wp-image-6864\" srcset=\"https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/composite-hose-inner-wire-collapse.jpg 800w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/composite-hose-inner-wire-collapse-300x225.jpg 300w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/composite-hose-inner-wire-collapse-768x576.jpg 768w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/composite-hose-inner-wire-collapse-16x12.jpg 16w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/composite-hose-inner-wire-collapse-600x450.jpg 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p>Figure 2. A flattened oval halfway along the length is what a vacuum the helix cannot hold leaves behind, and the bore does not come back. The vacuum rating for each type is in Table 1, and the check that finds it early is described above.<\/p>\n\n\n\n<p>A composite hose inner wire that has lost section behaves the same way, one stage earlier, because the stiffness goes before the shape does. The standard&#8217;s crush recovery test, Annex D, requires recovery to within 3 per cent after a defined crush, which says something about resilience and nothing about a kink. A kinked hose is outside the test, because the fold has passed the elastic limit of both wire and film.<\/p>\n\n\n\n<p>Temperature accelerates the process. A thermoplastic wall softens as it warms, so a hose at +120 \u00b0C holds less vacuum than the same hose at +20 \u00b0C, even though the type rating covers the whole range. A hot suction line is the hardest case in the plant.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"how-does-inner-wire-corrosion-start\">How Does Inner Wire Corrosion Start?<\/h2>\n\n\n\n<p>Corrosion rarely starts in the middle of a hose. It starts where the wire is exposed.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>At a cut end, where the helix is visible and the coating stops short of the fitting.<\/li>\n\n\n\n<li>Under a crimped ferrule, where the sheath is compressed and may be cut by the ferrule edge.<\/li>\n\n\n\n<li>At the outside, where a damaged cover lets water and chloride reach the external helix, which is often the same wire specification as the internal one.<\/li>\n\n\n\n<li>At a flange face, where a dissimilar metal joint sets up a small galvanic cell in the presence of an electrolyte.<\/li>\n<\/ul>\n\n\n\n<p>Galvanised carbon steel gives the clearest warning, because the zinc goes first and leaves a white deposit before the steel rusts. Stainless steel gives less warning, and its attack is usually pitting under a deposit rather than general thinning.<\/p>\n\n\n\n<p>The mechanical consequence is what matters here. A wire that loses 20 per cent of its section loses far more than 20 per cent of its bending stiffness, so the vacuum margin falls away faster than the visual condition suggests. That is why a hose can pass a pressure test and collapse on the next suction duty.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"what-is-composite-hose-delamination\">What Is Composite Hose Delamination?<\/h2>\n\n\n\n<p>Composite hose delamination is the separation of the wall plies from each other, and it usually follows a path along the helix rather than across the wall.<\/p>\n\n\n\n<p>The bond between plies is a thermal bond in most builds. A solvent that swells the film can shear that bond, and a corroding wire that produces voluminous rust can prise the plies apart from the inside. Both mechanisms leave product in the interstice, which then travels along the helix to the nearest opening.<\/p>\n\n\n\n<p>Three signs point to it, and each one is visible on a walk-round. A blister or soft spot on the cover, a bulge close to a fitting, and a vacuum reading that will not hold even though the hose shows no external damage. The fourth sign is product in the annulus at a ferrule, which is the same defect seen from the other end.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/composite-hose-wire-corrosion.jpg\" alt=\"Cover peeled back to show a rusted inner helix and stained fabric\" class=\"wp-image-6833\" srcset=\"https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/composite-hose-wire-corrosion.jpg 800w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/composite-hose-wire-corrosion-300x225.jpg 300w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/composite-hose-wire-corrosion-768x576.jpg 768w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/composite-hose-wire-corrosion-16x12.jpg 16w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/11\/composite-hose-wire-corrosion-600x450.jpg 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p>Figure 3. The cover has been opened to show the helix rusted along its length and the fabric stained brown: the attack began at a breach the outside never showed. What a walk-round can catch is listed in this section, and the wire grades are in Table 1.<\/p>\n\n\n\n<p>Signs of composite hose delamination appear before a leak does, which is why the two are often confused. Delamination is not the same as a leak-before-burst event. A leak begins at a film breach and moves outward. Delamination begins at a bond failure and moves along the wall. The <a href=\"https:\/\/www.henghuahose.com\/fr\/composite-hose-leak-before-burst\/\" target=\"_blank\" rel=\"noopener\">leak-before-burst explanation<\/a> covers the first; this section covers the second.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"which-symptoms-point-to-which-cause\">Which Symptoms Point to Which Cause?<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Symptom<\/th><th>Probable cause<\/th><th>Check<\/th><th>Action<\/th><\/tr><\/thead><tbody><tr><td>Bore oval, flow reduced<\/td><td>Helix under-specified or softened by heat<\/td><td>Vacuum hold test at the rated figure<\/td><td>Replace, and review the temperature<\/td><\/tr><tr><td>Kink that will not straighten<\/td><td>Bend below the rated radius<\/td><td>Compare the route with the standard radius<\/td><td>Reroute, then replace<\/td><\/tr><tr><td>White deposit at a cut end<\/td><td>Zinc coating consumed on galvanised wire<\/td><td>Inspect the helix at both ends<\/td><td>Replace if the steel is exposed<\/td><\/tr><tr><td>Rust under a split cover<\/td><td>inner wire corrosion fed by water ingress<\/td><td>Lift the cover edge, inspect the wire<\/td><td>Replace, and repair the cover route<\/td><\/tr><tr><td>Soft spot on the cover<\/td><td>Product in the interstice, delamination<\/td><td>Squeeze test and vacuum hold test<\/td><td>Retire the hose<\/td><\/tr><tr><td>Vacuum will not hold, no visible damage<\/td><td>Internal wire corrosion or bond failure<\/td><td>Vacuum decay test, bore light<\/td><td>Retire, cut a section for inspection<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><em>Table 2. Symptom, cause and check for a failing composite hose inner wire. The vacuum hold test is the single most useful check, because it measures the wire&#8217;s job directly.<\/em><\/p>\n\n\n\n<p>Reading the table in reverse is also useful. If a hose passes a vacuum hold test and still collapses in service, the vacuum in service is deeper than the test. That duty needs a different specification, not a new hose.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"which-checks-catch-it-early\">Which Checks Catch It Early?<\/h2>\n\n\n\n<p>A composite hose vacuum test is the direct measurement, and it takes minutes on a bench with a blanking plate and a gauge. The composite hose inner wire is the part that the test is really measuring, because the film either holds or it does not.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pull the hose to the rated vacuum, close the valve and watch the gauge for ten minutes. A slow rise means the wire is moving or the wall is leaking.<\/li>\n\n\n\n<li>Inspect the bore with a light at both ends. A flattened section near a bend is visible without any instrument.<\/li>\n\n\n\n<li>Check the helix at each cut end for coating loss, white deposit or rust.<\/li>\n\n\n\n<li>Squeeze the cover along the full length for soft spots and blisters.<\/li>\n\n\n\n<li>Confirm continuity between the two fittings, which proves the wire path is intact.<\/li>\n\n\n\n<li>Measure the helix pitch near each fitting against a new hose, because a pulled helix shows as a widened pitch.<\/li>\n<\/ul>\n\n\n\n<p>Our <a href=\"https:\/\/www.henghuahose.com\/fr\/hose-failure-analysis-petrochemical-plants\/\" target=\"_blank\" rel=\"noopener\">failure analysis note<\/a> sets out how to section a retired hose so the wire condition can be read properly rather than guessed from the outside.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"which-duties-put-the-helix-at-risk\">Which Duties Put the Helix at Risk?<\/h2>\n\n\n\n<p>Five duties account for most of the collapsed hoses we see.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Suction unloading from a tanker or a road tanker, where the pump pulls against a nearly closed line at the end of the transfer.<\/li>\n\n\n\n<li>Vapour recovery, where a Type 1 hose at 0.5 bar is used on a duty that occasionally pulls deeper.<\/li>\n\n\n\n<li>Hot product above +100 \u00b0C, where the wall softens and the same helix holds less.<\/li>\n\n\n\n<li>Acid and chloride service, where the wire grade matters more than the film.<\/li>\n\n\n\n<li>Steam cleaning or caustic washdown, where the outside of the hose sees the chemical rather than the inside.<\/li>\n<\/ul>\n\n\n\n<p>A <a href=\"https:\/\/www.henghuahose.com\/fr\/composite-hose-sizing\/\" target=\"_blank\" rel=\"noopener\">sizing review<\/a> settles the first case, because a larger bore reduces the vacuum needed for the same flow. The second case is usually a specification error, and the fix is a Type 2 or Type 3 hose rather than a new Type 1.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"how-do-you-specify-the-wire\">How Do You Specify the Wire?<\/h2>\n\n\n\n<p>Six fields decide whether the helix survives the duty.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Field<\/th><th>What to state<\/th><th>Consequence if omitted<\/th><\/tr><\/thead><tbody><tr><td>Wire material<\/td><td>Stainless grade, or carbon steel with sheath<\/td><td>Unexpected corrosion in acid or chloride service<\/td><\/tr><tr><td>Sheath thickness<\/td><td>Not less than 0.5 mm for coated carbon steel<\/td><td>Coating fails at the first abrasion<\/td><\/tr><tr><td>Vacuum rating<\/td><td>The figure for the duty, not just the type<\/td><td>Collapse at the end of a suction stroke<\/td><\/tr><tr><td>Helix pitch<\/td><td>Matched to the bend radius of the route<\/td><td>Kink at a radius the hose cannot take<\/td><\/tr><tr><td>Fitting match<\/td><td>Scrolls that match the helix pitch<\/td><td>Wire pulled out of the fitting under load<\/td><\/tr><tr><td>Continuity<\/td><td>Bonded at both ends, value recorded<\/td><td>Static path broken without anyone noticing<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><em>Table 3. Specification fields for a composite hose inner wire. The fitting match is the one buyers most often leave to the supplier, and it is the one that decides whether the wire stays anchored.<\/em><\/p>\n\n\n\n<p>The fitting detail deserves its own sentence. The standard requires the part of the fitting that enters the hose to carry scrolls or protrusions matching the pitch of the internal helix. A fitting without them relies on friction alone, and a hose under vacuum load will move on the fitting before it fails anywhere else.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"faq\">Foire aux questions<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"what-is-the-inner-wire-of-a-composite-hose-made-of\">What is the inner wire of a composite hose made of?<\/h3>\n\n\n\n<p>The composite hose inner wire is stainless steel in most chemical and marine builds, typically one of the four grades listed in EN 13765. Galvanised or sheathed carbon steel and aluminium are also allowed depending on the product.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"can-a-composite-hose-take-full-vacuum\">Can a composite hose take full vacuum?<\/h3>\n\n\n\n<p>Types 2, 3 and 4 are rated 0.9 bar, which is close to full vacuum. Type 1 is rated 0.5 bar, so it is not a suction hose. Above the rating the helix yields and the bore does not recover.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"why-did-my-hose-flatten-even-though-the-pressure-rating-was-correct\">Why did my hose flatten even though the pressure rating was correct?<\/h3>\n\n\n\n<p>Pressure and vacuum are separate ratings. A hose built for pressure duty may carry a vacuum rating that is lower than the suction the pump produces at the end of a stroke.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"does-inner-wire-corrosion-show-on-the-outside\">Does inner wire corrosion show on the outside?<\/h3>\n\n\n\n<p>Often not. Stainless wire can pit under a deposit with no external sign, and the first symptom is a vacuum that will not hold. Galvanised wire gives more warning, with a white deposit before the steel rusts.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"is-delamination-caused-by-the-wire\">Is delamination caused by the wire?<\/h3>\n\n\n\n<p>Sometimes. Rust under a sheath expands and prises the plies apart, and a corroding wire also lets product travel along the helix. Solvent attack on the bond is the other common cause.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"how-do-you-test-the-wire-without-cutting-the-hose\">How do you test the wire without cutting the hose?<\/h3>\n\n\n\n<p>Measure continuity between the two fittings and run a vacuum hold test. The composite hose inner wire is bonded at both ends, so a break in the path or a gauge that will not hold shows up immediately.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"can-a-collapsed-hose-be-repaired\">Can a collapsed hose be repaired?<\/h3>\n\n\n\n<p>No. A kinked helix cannot be straightened back to its rated shape, and a cut-and-recouple repair usually shortens the hose below its rated bend geometry. Replacement is the only sound answer.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"how-often-should-the-wire-be-checked\">How often should the wire be checked?<\/h3>\n\n\n\n<p>At every walk-round for external signs, and at each scheduled pressure test with a vacuum hold test. Our <a href=\"https:\/\/www.henghuahose.com\/fr\/en-13765-composite-hose-types\/\" target=\"_blank\" rel=\"noopener\">type guide<\/a> sets out which vacuum figure applies to which type.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"about-henghua\">About HENGHUA<\/h2>\n\n\n\n<p>Assemblies from HENGHUA use PTFE, UHMWPE, XLPE and polypropylene linings, a woven fabric reinforcement, and a stainless steel or coated carbon steel helix in the bore and over the cover. Ends are crimped or flanged, with fixed or floating flanges, and the fitting scrolls are matched to the helix pitch of the hose they are built on.<\/p>\n\n\n\n<p>The construction is described in our <a href=\"https:\/\/www.henghuahose.com\/fr\/composite-hose-multilayer-construction\/\" target=\"_blank\" rel=\"noopener\">multi-layer build guide<\/a>, and the finished range sits in the composite hose category. If a suction line has collapsed or a vacuum will not hold, send the duty, the product and the pump details. We will check the specification against the application rather than simply quoting a replacement.<\/p>","protected":false},"excerpt":{"rendered":"<p>The composite hose inner wire is the steel helix that runs inside the bore, and it does two jobs at once. It holds the bore round against vacuum and crush, and it gives the assembly a conductive path through the wall. When that wire is weakened, the hose does not leak first. It flattens, and 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