PP Chemical Composite Hose 10 Bar

A pp chemical composite hose is chosen one medium at a time, so start with the boundary conditions. This build covers bore 25 mm to 100 mm (1 in to 4 in), working pressure 10 bar (145 psi), service temperature -30°C to +100°C, and a standard 15 m length. The liner is multiple plies of polypropylene film, which suits dilute and many concentrated acids, alkalis, alcohols and aliphatic hydrocarbons. It is not the hose for aromatic solvents or chlorinated hydrocarbons. Send the medium, concentration and temperature before you order.

製品概要

This is a non-vulcanised, multi-layer thermoplastic hose for liquid chemical transfer. In the EN 13765:2018 family it sits in Type 2, the standard-duty class for liquid service, with a 4:1 design factor on burst. The layers are pressed between two steel helices rather than bonded by vulcanisation, which is why a 100 mm bore stays flexible and still holds full vacuum.

In one sentence, the pp chemical composite hose is a PP film liner inside a PP fabric and film carcass with polyester barrier plies, wrapped in an abrasion-resistant PVC-coated fabric cover, over a PG, PS, SG or SS helix pair.

Three numbers frame it: 10 bar working pressure across the range, -30°C to +100°C service temperature, and a 0.9 bar vacuum rating, which is full vacuum. One hose therefore serves suction and discharge.

The advantages follow from the material. Polypropylene resists most mineral acids and caustic, so a plant can standardise on one acid resistant hose instead of stocking several. The bore stays smooth, so pressure drop is predictable, and 1.00 kg/m at 25 mm rising to 5.40 kg/m at 100 mm keeps a 15 m length a two person lift.

Typical users are chemical plants, water treatment works, plating lines, fertilizer producers and tank truck operators. Equipment includes drum pumps, diaphragm and centrifugal transfer pumps, tank car connections and IBC decanting stations that need a flexible last metre.

The problem it solves is the middle of chemical transfer: media that attack a general rubber hose but do not justify a fluoropolymer liner. A PP liner handles 35% hydrochloric acid, 50% sodium hydroxide and 30% sulphuric acid at ambient temperature, and the inner helix removes the vacuum limit of a braided rubber hose.

Quality is proven on the finished assembly, not on a sample of rubber sheet. Each assembly is pressure tested at 1.5 times its 10 bar rating, the crimp data is filed against the assembly serial number, and the liner and helix lots are recorded so a batch can be traced back to incoming inspection. The plant runs ISO 9001, and the chemical range is built to EN 13765:2018 with CE, RoHS and Proposition 65 documentation available for the markets that ask for it.

Product Advantages of the PP Chemical Composite Hose

• Broad acid and caustic resistance. This acid resistant hose covers dilute and many concentrated acids plus alkalis.
• Full vacuum without a second hose. A 0.9 bar rating lets one line handle suction and discharge.
• Low handling weight. At 1.00 kg/m for 25 mm bore, 15 m lengths stay a two person lift.
• Four helix combinations. PG, PS, SG and SS match corrosion resistance to the site.
• Smooth, consistent bore. Film plies give a stable bore and predictable pressure drop.
• Crimped fittings with digital records. Every assembly is swaged in house and traceable to batch.

Applicable users: chemical plant maintenance teams, tank truck operators, water treatment contractors, plating shops, and industrial distributors who stock chemical hose as a standard line.

Detailed Technical Specifications

• Temperature: -30°C to +100°C continuous. Above 80°C the chemical margin narrows, so recheck the medium at your real temperature.
• Safety factor: 4:1 on burst, a 40 bar margin at the 10 bar rating. Proof test is 1.5 times working pressure, or 15 bar.
• Vacuum: 0.9 bar, full vacuum, at all six bores. Do not exceed it during priming or tank drainage.
• Tolerances: bore and concentricity to EN ISO 1307. State tighter tolerances at quotation.
• Testing: hydrostatic proof to EN ISO 1402 on every assembly, impulse to EN ISO 6803 on samples.
• Custom lengths: 15 m is standard; other lengths are cut, crimped and tested to order.

Structure and Materials

The pp chemical composite hose is five functional layers, each with one job.

• Inner helix: polypropylene-coated steel on PG and PS, SS316L on SG and SS. It resists vacuum collapse and holds the bore open.
• Liner: multiple plies of PP film, overlapped and compressed. Only this layer touches the medium.
• Carcass: PP fabric and film plies with polyester barrier plies, carrying axial load and limiting permeation.
• 表紙： abrasion-resistant PVC-coated fabric, resistant to splash, sunlight and dragging.
• Outer helix: hot-dip galvanised carbon steel on PG and SG, SS316L on PS and SS. It takes the hoop load of the 10 bar rating and absorbs the abrasion of dragging across steel grating.

Why the composite build holds up

The inner wire is a spring that refuses to flatten. Under suction from a drum pump the PP film liner has no stiffness of its own, so the helix keeps the bore round while the fabric plies take the axial pull. A braided rubber suction hose needs a heavier, stiffer wall for the same 0.9 bar vacuum.

Between the two wires the PP fabric plies sit at a bias angle. Internal pressure tries to lengthen the hose and grow its diameter at once, and the fabric turns both into tension in its own yarns, so the film only has to seal. Polypropylene is why the same hose survives 35% hydrochloric acid: a pure hydrocarbon polymer, with no cure system and no plasticiser to leach.

Nothing in the wall is vulcanised, so plies slide a fraction of a millimetre against each other at a bend. At 100 mm bore that gives a 350 mm bend radius, which is how a 15 m length gets walked around a tank farm corner by two people. The trade is honest: a crimped ferrule, not a bond, keeps the wall compressed.

Safety factor, proof pressure and burst margin

The 10 bar figure is a continuous working pressure, not a burst point. At the published 4:1 design factor the assembly should hold roughly 40 bar before rupture, and every unit leaves the plant having held 15 bar for the proof period. Proof testing is aimed at the failures that actually occur: a mis-set crimp, a creased liner, a ferrule that was never fully swaged.

Three questions separate a real 4:1 claim from a catalogue number. Was the burst ratio measured at the top of the temperature range or only at 20°C? Is the proof test applied to every assembly, or to a sample pulled from the run? Do the crimp records carry a serial number matching the hose on your rack? A batch level answer is not a serial level answer, so ask for the EN ISO 1402 report for the bore you are buying, measured on the finished assembly.

Chemical Compatibility and Media Guide

Ratings are guidance for a PP liner at ambient temperature with no contamination. They open the quotation conversation rather than replace a written confirmation.

Three rules make the chart usable. Temperature: a rating earned at 20°C is not a rating at 90°C, and PP loses margin faster near its ceiling. Concentration: 30% sulphuric acid is routine for this build and 98% is not. Contact time: a 20 minute transfer and a column left standing overnight are different experiments. Send your media list with concentrations and temperatures, and we return a written answer with the compatibility chart as a PDF.

Applications and Industries

• Chemical plant transfer lines: diaphragm and centrifugal pumps, reactor feed lines, drum decanting and filter press connections where the medium changes between batches.
• Water and waste treatment: ferric chloride, caustic, polymer and lime slurry lines, with hypochlorite excluded unless another liner is specified.
• Electroplating and surface finishing: acid pickling, caustic degreasing and rinse water feeding plating barrels and overflow tanks.
• Fertilizer and agricultural chemicals: phosphoric acid, ammonia solution and urea at mixing and blending plants.
• Tank truck and tank car unloading: suction and discharge connections where one hose must cover several products.
• Distributors and OEM skid builders: 15 m lengths cut to order and supplied as a complete composite hose assembly with your ends and label.

Selection Guide for PP Chemical Composite Hose

Size, flow and pressure drop

Choose the bore from flow and velocity, then check the pressure. Keep liquid velocity near 2 m/s for continuous duty and under 3 m/s for intermittent transfer, because a fast stream scours the liner at each bend and builds static. At those speeds a 25 mm bore moves about 3 to 4 m3/h and a 100 mm bore 50 to 60 m3/h.

End fittings and hose assembly

Fittings are crimped, not clamped, and we swage them in house with a digital record for each chemical composite hose assembly. Standard ends are NPT male, BSP male, camlock, fixed flange, floating flange, reducing flange, tank coupling and 37 degree flare adapters, in stainless or carbon steel. Camlocks suit drum changeover; flanges suit fixed pipework.

How it compares

What drives the price

Four variables move the price: bore, helix alloy, ferrule material and cut length. A stainless pair costs more than coated carbon steel, and the gap widens with bore because helix mass scales with diameter. Compare quotations for the same pp chemical composite hose with the ends included, since a low headline often quotes bare hose; on bulk and wholesale orders the real lever is batching several bores into one order and one destination port.

Common selection mistakes

• Choosing on chemical name only. 30% and 98% sulphuric acid are different duties, and the second needs fluoropolymer.
• Ignoring temperature derating. A medium rated Excellent at 20°C may be outside margin at 90°C.
• Undersizing the bore to save cost. The pump runs off curve and the saving is lost in downtime.
• Mixing fitting materials. A stainless helix with a carbon steel flange creates a corrosion cell.

Installation, Operation and Maintenance

Installation

• Keep to the published bend radius: 90 mm at 25 mm bore, rising to 350 mm at 100 mm.
• Support horizontal runs every 1.5 m on a saddle, never on rope or chain.
• Allow one bore diameter of straight hose behind each ferrule so the crimp never works in bending.
• Add a swivel at the fixed end where the coupling has to be rotated into position.
• Carry a filled 100 mm assembly at the body, not by the fittings, and fit a protective sleeve where it crosses a handrail.

Inspection and retirement

Walk the cover before each shift: cuts, blisters, chalky patches and soft spots are each a reason to look further. Run a thumb along the ferrule transition, because any movement between ferrule and cover means the compression has relaxed. A swelling just behind a fitting is the carcass reporting that it has started to fail, and that hose leaves service the same day. On conductive builds, check end to end continuity at the same interval and log the reading against the assembly serial number.

Cleaning, storage and service life

After each product change, flush with water or a compatible solvent, drain, and hang with both ends open. Store coiled at or above the minimum bend radius, out of sunlight and away from welding sets, which generate ozone that attacks the cover. Service life follows bending at the ferrule, dragging and chemical exposure, so log medium, temperature and running hours, and review acid duty hose at six years.

Quality Assurance and Test Data

The line runs in one direction: incoming film, fabric and wire are checked against mill certificates, liner plies are wound, the carcass is built over the inner helix, and the wall is compressed with no cure step anywhere. Crimping happens on a press that records pressure, stroke and die set against each serial number, and the proof test follows immediately, so a bad crimp is caught before packing rather than at the customer’s rack.

Test coverage is hydrostatic proof to EN ISO 1402 on every assembly, impulse to EN ISO 6803 on retained samples, resistance to EN ISO 8031 where a conductive build is ordered, bend to EN ISO 1746 and dimensions to EN ISO 1307. Film and fabric lots are filed against the assembly serial, so a delivery question is answered from records. Export packing is film wrap plus a plywood case for LCL, and bubble wrap on a reel for FCL.

Standards and Certifications

Company certifications: ISO 9001 and ISO 18752, alongside CE, CCS, ABS, DNV, API, GOST-R, MSHA, RoHS, California Proposition 65 and MA metrology accreditation held at group level. Scope differs by product and market, so ask for the certificate set that applies to your order.

よくある質問

What is the hose made of?

A PP film liner, a PP fabric and film carcass with polyester barrier plies, a PVC-coated fabric cover, and two helices in coated steel or SS316L. Only the film touches the medium.

What does the 10 bar rating mean?

It is the pressure the hose holds continuously, backed by a 4:1 burst factor and a 1.5x proof test. It is not a surge rating, so a valve that slams shut above 10 bar is a design error, not a margin.

Can it handle vacuum?

Yes, 0.9 bar, which is full vacuum, at all six bores. The inner helix carries the collapsing load, so no second suction grade is needed.

What is the temperature limit?

-30°C to +100°C. Chemical margin narrows towards the ceiling, so a medium rated Excellent at ambient still needs rechecking at 90°C.

Will it handle my solvent?

Acids, alkalis, alcohols and aliphatic hydrocarbons are its home ground. Aromatic solvents, chlorinated hydrocarbons and strong oxidisers are not, and those duties belong with a fluoropolymer liner.

How is it different from a rubber hose?

A rubber hose is vulcanised, so its layers are bonded and its reinforcement is sized for internal pressure. This one is compressed rather than cured, and the inner helix keeps the bore open under vacuum.

When should I move up to PTFE?

Move up when the medium is aromatic, chlorinated, a strong oxidiser, or hotter than 100°C. The PTFE composite hose covers those cases and costs more per metre, which is why we ask for the medium before quoting either one.

What is the minimum order quantity and lead time?

Sampling for a custom build is quoted at 48 hours, and standard specifications run on a 7 day bulk turnaround. Minimum quantity depends on bore and end configuration, so it is quoted per enquiry rather than published.

How do I get a quote or a PDF datasheet?

Send medium, concentration, temperature, pressure, bore, length and end connection through the site contact form. You receive a quotation, the datasheet PDF and the compatibility chart for your media list.

Why Source Composite Hose from HENGHUA

HENGHUA makes composite hose at an 18,000 m2 plant in the Hengshui area of Hebei, with a Tianjin office handling export documents. Eight high-speed lines turn out 25 million metres a year for customers in 70+ countries, so a pp chemical composite hose order arrives with the port paperwork already in the file.

Certification covers ISO 9001 and ISO 18752 alongside CE, CCS, ABS, DNV, API, GOST-R, RoHS, California Proposition 65 and MA, with scope depending on product and market. For this build the documents that matter are the EN 13765:2018 test report, individual proof records for your serial numbers, and mill certificates for the liner film and both helices.

The practical difference is assembly. We crimp in house, hold NPT, BSP, camlock and flange ends in stock, and ship a finished composite hose assembly rather than hose plus loose fittings. OEM and ODM work is routine, from your label and packaging to a fitting schedule that changes by bore.

Sampling on a custom build takes 48 hours, and standard specifications ship on a 7 day bulk turnaround with order tracking. Sales engineers read compatibility charts daily, so a question about 98% sulphuric acid at 80°C gets an answer rather than a brochure. As a manufacturer and exporter in china we can also tell you which standard your market will test against.

お見積りのお申し込み

Send the medium, its concentration, the operating temperature, the working pressure, the bore, the length, the end connection, the quantity and the destination port. With those answers we select liner, helix code and fittings, then price the pp chemical composite hose against your duty rather than a catalogue guess. You will receive a quotation, the datasheet PDF, the compatibility chart for your media, and a sample where the order size justifies one. Browse the composite hose range or use the contact form to reach a sales engineer.