A drum or IBC transfer line is short, low pressure and handled constantly. It is also the assembly most likely to be picked up by the hose rather than the coupling, dropped on a concrete floor, and used on four different chemicals in a week. The engineering here is unglamorous and it is where a great many small chemical spills come from.
What this service does to a hose
Short assemblies concentrate the bend. A metre-long hose being manoeuvred into a drum bung is bent hard at both ends by hand, and there is very little live length to distribute that over. The bend lands at the ferrule transition, which is the stress concentration. Short assemblies need ferrule guards far more than long ones do — see bend radius and live length.
Multi-product use is the real hazard. The same wand and hose used on an acid on Monday and a caustic on Wednesday, with a rinse in between that may or may not have been thorough. Residue in a corrugation valley is what mixes. Where a line genuinely carries more than one product, either dedicate assemblies per product, or specify a smooth bore that drains and can be verified clean.
Static, on a small scale that still ignites. Decanting solvent from a drum is a recognised static-ignition scenario. Drum, hose, wand and receiving vessel all have to be bonded together and earthed, and the assembly has to be part of that path. A welded metallic hose is continuous; a plastic wand on the end of it is not.
Suction as often as pressure. Many of these lines are drawn on rather than pushed through. That raises collapse, which the braid does nothing for — see vacuum hose for why.
What we would fit
| Element | What we would supply | Why |
|---|---|---|
| Hose | 316L annular corrugated as the default; PTFE-lined where the chemical demands it | The chemical decides this; see the individual duty pages |
| Bore | Smooth PTFE bore on multi-product lines | So it drains and can be verified clean between products |
| Braid | Double braid, always, on a hand-handled assembly | It is dropped and dragged and there is no margin without it |
| Ends | Guarded ferrules both ends, with a metallic wand where bonding matters | The bend lands at the ferrule and the bond path must be continuous |
| Marking | Product-dedicated marking where assemblies are not to be interchanged | It is the cheapest control there is |
What we would not fit, and what happens
Single braid on a hand-handled assembly. It will be dropped.
Unguarded ferrules on a short assembly. All the handling load lands there.
An unlined corrugated bore on a multi-product line. The valleys carry the last product into the next one.
A plastic wand in a bonded system. It breaks the earth path at the point where the charge is generated.
What we need to size it
| We need | Because |
|---|---|
| Every chemical the assembly will see, not just the main one | We specify for the worst case unless assemblies are dedicated |
| Whether the line is dedicated per product or shared | It decides whether a smooth bore is essential |
| Pressure or suction, and the pump type | Suction raises collapse, which the braid does not help with |
| Whether the area is classified and what the bonding requirement is | It decides continuity certification and the wand material |
| Length required and how it is stored between uses | Storage is where most of the damage happens |
| End connections, including the drum or IBC fitting | Bung and IBC outlet fittings are specific families |