Helical bending

Manufacture of streamlined coils and pressure vessels

CEPHI, through its recognized experience in the design and manufacture of heat exchangers, is also supplier of coils (stainless steel, steel and others on request).

So, we are able to realize exchange coils subject or not to the pressure directive DESP2014 / 68-EU and the manufacturing codes such as CODAP-ASME-EN13445, etc …

These coils can be equipped with end flanges or any other device allowing their commissioning – male end caps, gas sleeves, clamps, etc …

A few details

In the case of regulated equipment or on demand, these coils, if they are soldered by welding due to their length, will be made by qualified welders, following welding processes established and validated by an approved organization .

We also provide:

inspection by a COFREND II controller,
mechanical strength tests (hydraulic test), if required by regulation or on request,
any other type of tests or checks may also be conducted – Helium leak tests, radiographic checks of welds.

A complete file containing all the useful documents can be produced: plans, welding book including QMOS, QS, material certificates, reports of the inspections carried out.

The table below describes the machine capabilities for the realization of the coils according to the diameter and the pitch:

Nominal Ø	Ø in "	Ø Ext.	Thickness	Sch.10S	Sch.40S	bending Ø minimum	Bending radius flat
		6.00 mm	1.00 mm			80 mm	16 mm
		8.00 mm	1.00 mm			80 mm	25 mm
		10.00 mm	1.00 mm			80 mm	25 mm
		12.00 mm	1.00 mm			100 mm	39 mm
DN05	1/8	10.29 mm		1.24 mm	1.73 mm	150 mm
DN08	1/4	13.72 mm		1.65 mm	2.24 mm	160 mm
DN10	3/8	17.14 mm		1.65 mm	2.31 mm	230 mm
DN15	1/2	21.34 mm		2.11 mm	2.77 mm	225 mm
DN20	3/4	26.67 mm		2.11 mm	2.87 mm	255 mm
DN25	1	33.40 mm		2.77 mm	3.38 mm	300 mm
DN32	1 1/4	42.16 mm		2.77 mm	3.56 mm	310 mm
DN40	1 1/2	48.26 mm		2.77 mm	3.68 mm	350 mm
DN50	2	60.36 mm		2.77 mm	3.91 mm	500 mm
DN65	2 1/2	73.02 mm		3.05 mm	5.16 mm	600 mm
DN90	3 1/2	101.60 mm		3.05 mm	5.74 mm	700 mm

Successfully completed projects

spirale serpentinage exchangers — Heat exchangers with low pressure drop for a 304L stainless steel lysimeter with an internal diameter of 2 540 mm. Bending of tubes Ø60.3 x 2.77 mm. (Construction of 16 units)

316L stainless steel CO2 exchanger for customer processes with a PMS at 40 bar g. Bending of tubes Ø33.4 x 4.55 mm. Study according to CODAP and realization.

Serpentin quadruple enroulement — Quadruple coil - Optimisation of the exchange surface in an extremely limited volume

serpentine Xenon heater Bending — Xenon heater with a capacity of 108 kg/h and a PMS of 230 bar g. Bending of Ø9.52 x 1.24 mm tubes. Thermal and mechanical study and production.

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