Helical coils
The tube wound into a constant-diameter helix: the most compact way to fit a long tube into a round tank or vessel.
Dimensions and detailsIntegrated manufacturing + export coordination
Coil shapes
Coil shapes made to drawing.
Uniinox forms stainless steel and copper tube into each of the shapes below to the customer's drawing. Choose the shape that fits the space, then send the dimensions listed on its page.
Flat spiral (pancake) coils
The tube wound outward in one plane: for shallow spaces such as the bottom of a tank or against a flat surface.
Dimensions and detailsSerpentine (U-bend) coils
Straight passes joined by 180° return bends, forming a flat panel of tube for rectangular tanks, baths and walls.
Dimensions and detailsRectangular coils
Stacked rounded-rectangle turns that use the floor area of rectangular tanks and baths better than a round coil.
Dimensions and detailsMulti-layer and dual-circuit coils
Nested layers or parallel circuits that add tube surface or shorten the flow path without changing the coil's outline.
Dimensions and detailsConical (tapered) coils
A helix whose diameter changes from turn to turn, following the wall of a cone-bottom vessel or tapered space.
Dimensions and detailsCompare
Which shape fits your space?
The tube length of the helical, flat spiral and serpentine shapes can be worked out with the coil tube length calculator.
| Shape | Typical space | Defined by |
|---|---|---|
| Helical | Round tanks, vessels and compact housings | Coil diameter, height, pitch, turns |
| Flat spiral (pancake) | Shallow round spaces, tank bottoms | Outside diameter, centre opening, turns |
| Serpentine (U-bend) | Flat panels along walls or floors | Straight length, passes, bend radius |
| Rectangular | Rectangular tanks and baths | Length, width, corner radius, height, pitch |
| Multi-layer / dual-circuit | More tube or a shorter flow path in the same space | Each layer's diameter, gap, circuits |
| Conical (tapered) | Cone-shaped vessel sections | Top and bottom diameters, height, pitch |
Any shape, to your drawing