PVC Vacuum Hose — Two Published Constructions for Vacuum Duty

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The vacuum duty

Vacuum duty is any run where the inside of the hose sits below atmospheric pressure: a pump drawing water up from a pit, a tanker loading through a hose, extraction and suction transfer of powders and liquids. The failure mode is collapse — the wall gives way and the bore closes — and it is a construction problem, not a pressure-rating problem of the ordinary kind. A buyer searching for a PVC vacuum hose in this range is therefore not looking for a third product; they are looking for which of the range's published constructions holds its bore open under negative pressure, and the range answers with two.

The two published vacuum-capable constructions

Spiral steel wire. The PVC steel wire hose embeds a steel wire helix in a transparent PVC wall; the company describes the result as resistant to negative pressure, with a small bending radius, and lists the build for suction and delivery of water, oil, powder, sand and gravel. Its published per-size table gives bores, outside diameters, roll lengths and burst pressures for the sizes shown; working pressure at your bore is confirmed in the quotation.

Corrugated wall. The PVC suction hose is built as a corrugated PVC outer wall over a smooth flexible inner wall. Its published family data — bores 3/4 in to 8 in (suction family range; the rating at your bore is confirmed in the quotation), working pressure 3 to 8 bar across the family (suction family range; the rating at your bore is confirmed in the quotation), rolls of 10 m to 30 m (suction family range; the lengths offered for your bore are confirmed in the quotation), minimum order 100 m (suction family figure; the minimum for your bore and build is confirmed in the quotation) — frames it as the intake-side hose of a pumping set, in larger bores and shorter runs than the wire build's coils. The rating at your bore, for this family too, is confirmed in the quotation.

The facts a vacuum enquiry carries

• Vacuum level: how deep the vacuum is at the hose — a pump's rated suction, a tanker's vacuum, an extraction system's draw — stated as a figure, not as 'strong vacuum'.
• Bore and run length: vacuum losses grow with length and shrink with bore; the pair together decides whether the far end of the run still pulls.
• Medium: water, oil, powder, sand and gravel are the steel wire build's listed media; powders and dust raise the abrasion and static questions covered on the dust collection page.
• Bends and fittings: the tightest bend on the route and the couplings at each end — collapse and leakage both start at fittings and bends.
• Whether the same hose must also deliver: the steel wire build is listed for suction and delivery together; the corrugated build is the intake-side construction — say which duty pattern you need.

One position runs through both builds: no vacuum rating figure for either construction is published in the company's data, so the rating for your bore and your vacuum level is a quotation fact. State the level, the bore and the run, and ask for the build's position to be confirmed in writing — that confirmation, not a catalogue adjective, is what a vacuum line should be bought on.

Which construction is stronger under vacuum?

The published facts differ by build — the wire hose embeds a spiral steel wire skeleton in a transparent wall and is listed for suction and delivery; the corrugated hose is a smooth flexible PVC inner wall inside a corrugated PVC outer wall, the suction family's intake-side construction. Neither is published with a vacuum figure to rank them by; state your level and bore and have each build's position confirmed in the quotation.

Can I use layflat hose for vacuum?

No. Layflat is a soft-wall discharge format and collapses under vacuum. For a vacuum run, state the level, bore and run in the enquiry and ask which of the published vacuum-capable constructions — steel wire or corrugated wall — is confirmed for it.

What bore do I need for a vacuum tanker line?

State the tanker's connection size, the run length and the medium in the enquiry; bore is settled against those three, with the rating at that bore confirmed in the quotation. Undersizing a vacuum run starves the far end of the line.