Coiling
Helical, spiral wound and serpentine coils, wound cold up through 10″ pipe.
Coils wound to your pitch and diameter
American Pipe Bending coils cold up through 10″ pipe. Coils are made in helical, spiral wound and serpentine configurations, and in others if your drawing calls for something different.
The shop has built eight multi-pass helical coils and a six multi-wound coil with as many outlets, which is about as involved as coil geometry gets. It has also worked in sizes that are not standard stock, including 7 inch and 9 inch diameter pipe. If you can design it, the odds are good that we can build it.
Coils go where heat has to move: boilers, heat exchangers, process heaters and any service that needs a long run of tube inside a short length of vessel. The thing that decides whether a coil is any good is consistency from the first turn to the last, because a coil that drifts in pitch will not fit the shell it was designed for.
Request a quoteConfigurations
Helical
A continuous spiral at a constant pitch, the usual choice for a process heater or a heat exchanger coil. Multi-pass helical coils nest several circuits inside the same envelope so more tube fits in the same shell.
Spiral wound
Wound flat, turning inward, so the coil sits in a plane rather than a cylinder. Used where the space available is wide and shallow rather than tall.
Serpentine
A back-and-forth run of straight lengths joined by return bends. Common in panel work and in anything that has to sit flat against a wall or a tube sheet.
What to send with a coil enquiry
A coil takes more description than a single bend. Along with the pipe size, wall and material, we need the coil diameter, the pitch, the number of turns, the number of passes and where the inlets and outlets have to land.
If the coil has to fit inside something, send that dimension too and say whether it is a hard limit. It is common for a coil drawing to specify a pitch that will not physically wind in the material chosen, and it is much cheaper to find that out at quote stage than after the first turn.
Off the floor
What to send, and what it costs to leave out
Five numbers describe a bend: outside diameter, wall thickness, centerline radius, bend angle and the tangent length on each end. Add the material, the quantity and the code and the job can be priced. The quote form takes a drawing up to 25 MB in PDF, DWG, DXF, JPG or PNG, and a photograph of a marked-up print is fine.
The things most often left out are the ones that change the price most. Documentation is the first: material test reports, non-destructive testing and heat treatment all have to be priced and scheduled from the start, and retrofitting a package onto a finished bend is slow and sometimes impossible. The delivery date is the second, because it decides whether the job is possible rather than what it costs.
The third is the acceptance criteria. Wall thinning on the outside of the arc and ovality through it are the two numbers a reviewer checks first. Tell us the limits and we will confirm the tightest radius that holds them before anything is cut. Finding the boundary at quote stage costs nothing; finding it at first article costs a length of pipe and a week.
Where a drawing calls out a bend that cannot be made as dimensioned, you will hear about it at quote stage rather than at delivery. That happens more often than it should, usually because an isometric was drawn without a bend schedule and the radius was never checked against the wall. Working back from an isometric to the five numbers each bend needs is routine here, and it normally catches at least one dimension that does not close.
Testing we can provide
Per your bending specification, not ours. Tell us the code and the acceptance criteria and we will say what runs here and what is subcontracted.
Other ways we bend
Wall thickness, radius, material and schedule decide the method. If you are not sure which fits, send the drawing and we will tell you.
Heat Induction Bending
Cojafex induction bending up through 42″ O.D. and 4″ wall, in any radius, angle or plane.
Cold Bending
Rotary draw bending on fourteen machines, with mandrels and wiper shoes where the radius needs them.
Mandrel Bending
Ball mandrels and wiper shoes for tight radii and thin walls that would otherwise collapse.
Large Diameter Pipe Bending
The work most shops turn away: up to 42 inch outside diameter and 4 inch wall.
Stainless and Alloy Bending
Stainless, duplex, Hastelloy, titanium and nickel alloys, bent without wrecking the metallurgy.
Custom Pipe Fabrication
Cutting, end prep and fabrication around the bend, so one purchase order covers the package.
Have a drawing? Send it over.
Send a drawing or a sketch and our team will get back to you with a quote.