Industrial hose clamps: which clamp for which hose, and why the band is not on the list

Look along the clamps shelf and one thing is missing: the worm-drive band that holds half the hoses in the world onto their nipples. That is deliberate. A band squeezes a hose along one thin line, it loosens as the rubber relaxes, and its rating is whatever it happens to be that day. Every clamp we stock exists because a specific hose and duty needed something better — and choosing between them is mostly a matter of reading the hose.

/01What a clamp has to do.

A serrated tail holds a hose only as well as the hose is pressed onto it. The clamp provides that pressure, and the way it applies it decides the joint: evenly around the full circumference and along a good length of the tail, the serrations grip; on one narrow line, they cut. A good clamp also stays tight as the hose wall creeps and the temperature cycles, which is where a band fails first.

/02Safety clamps and steam clamps.

The forged safety clamp to EN 14420-3 — long known as DIN 2817 — is the clamp of chemical and oil transfer. It bolts around the hose in two halves and grips both the hose cover and a collar machined on the fitting, so it locks the fitting into the hose instead of relying on friction alone. It works with EN 14420-5 GA and GI fittings and is pointless on a plain barb. The EN 14423 clamp is its steam counterpart, for the European steam hose coupling system.

/03Interlocking, bolted and spiral clamps.

For suction and delivery hose on KC nipples, cam-lock shanks and Bauer or Storz tails, the workhorses are the interlocking clamp and the single or double bolt clamp. Both close around the hose with bolts rather than a screw band, both apply pressure across a wide face, and both can be re-tightened after the first pressurisation, when the hose takes its set. A spiral clamp follows the external helix on a suction hose, so it bears on the rubber between the coils instead of riding up on the wire.

/04Sanitary, drag hose and frac clamps.

Food, dairy and pharmaceutical lines join on sanitary (tri-clamp) ferrules, and our heavy-duty sanitary clamps — single pin with a wing nut, double pin, double-pressure bolted and three-segment — run in 304, 316 and 316L from 3/4" to 12". Drag hose for slurry and manure has its own set: an aluminium drag hose clamp, a sleeve and a coupling ring clamp from 4" to 10". And the frac-water couplings on our KC shelf use a three-segment aluminium clamp from 8" to 16".

/05When to crimp instead.

Every clamp leaves the joint dependent on someone fitting and re-tightening it. A crimped ferrule or sleeve removes that variable: it is swaged once, to a diameter, and it stays there. Our ferrules and sleeves for KC and cam-lock shanks, our heavy-duty ferrule rated 300 psi and our sanitary-style crimp ferrules all do that job, and CrimpTEK cam and groove halves are machined to be crimped directly. On any line where a separated hose would hurt someone or spill something, crimping is the better answer.