SANHA NiroSan: stainless steel press system – 15 to 168.3 mm

What NiroSan is meant for

NiroSan is a universal system: Sanha names drinking water, heating, compressed air (residual oil max. 25 mg/m³), fire-fighting installations wet to DIN 14462, sprinklers wet to VdS, technical gases, cooling water and glycols, plus shipbuilding. The material 1.4404 (316L) with its higher molybdenum content is more resistant to pitting than 1.4401 – an argument in chloride-containing waters and damp surroundings. Fuel gases go only with NiroSan Gas; saturated steam, district heating, oils and solar only with NiroSan Industry with FKM.

What makes NiroSan special in our range is the series up to 168.3 mm (DN 150): risers and distributors in commercial buildings can be pressed with it where the Viega metal systems end at 108 mm.

How the joint works: profiles, UVUD, Push & Stay

NiroSan fittings up to 54 mm can be pressed with three profiles – SA, V and M (Sanha calls this combipress): whoever owns a press machine with V or M jaws can process NiroSan without new tools. From 76.1 mm SA or M with press ring applies; 139.7 and 168.3 mm are pressed with press loop M. The factory-fitted EPDM sealing ring is visibly leaking during the pressure test as long as it has not been pressed (UVUD, leaks when unpressed) – Sanha's counterpart to the SC-Contur. Push & Stay holds the inserted pipe in the fitting before pressing, so that it does not slip out while aligning.

Same profile means same tool, not same system: a NiroSan fitting is pressed with a V jaw, but not combined with a Viega connector – the approval applies per system.

Pipe, sizes and availability

NiroSan pipes come in four executions: 1.4404 (standard), NiroSan ECO in ferritic 1.4521 (nickel-free, more economical), NiroSan F and NiroSan SF (silicone-free). All are approved to DVGW GW 541. The table shows the sizes and the availability: 15 to 54 mm and 108 mm in stock, 76.1, 88.9 and 168.3 mm to order.

The standard names dimensions. What is listed here, we carry – from stock or to order; how quickly something is available we clarify on request. From stock: elbows, bends, tees, reducers, couplings, threaded and flanged transitions – shop category fittings/stainless steel.

NiroSan, NiroSan Gas and NiroSan Industry

• NiroSan (EPDM black): water, aqueous solutions, technical gases; 16 bar, −30 to +120 °C; 15–168.3 mm.
• NiroSan Gas (HNBR yellow, series 17000): fuel gases to DVGW G 260 with 5 bar, −20 to +70 °C (GT/PN 1 and GT/PN 5, DVGW G 5614, TRGI, TRF); technical gases and hydrogen 16 bar, −30 to +100 °C, H2ready up to 100 % hydrogen; 15–108 mm. Available on request.
• NiroSan Industry (FKM red, marking HT, series 18000; silicone-free as SF, series 19000): 16 bar, −20 to +160 °C depending on the medium – saturated steam, district heating, heating oil, solar, compressed air with oil, sprinkler dry (VdS); 15–108 mm. Available on request.

The variants share pipe and profile; they are separated by colour code and marking. For applications within the scope of code of practice G 260 flat gaskets are not permitted with NiroSan Gas (catalogue note).

Which medium with which sealing element

Assignment after the SANHA product catalogue 2026 and the NiroSan brochure 08/2026. For most media Sanha names system values (16 bar, temperature range per sealing ring) – in the system finder they are marked as system values; pressures above 16 bar on request.

Transitions: thread, flange, other systems

Sanha offers transitions with female and male thread to EN 10226-1, loose and fixed flanges to EN 1092-1 and transition fittings; via thread or flange NiroSan connects to copper, multilayer and steel pipe systems. At the transition to galvanised steel use an insulating union and observe the flow rule (mixed installation).

NiroSan or Viega Sanpress Inox?

Both are all-stainless systems with drinking water approval, both we carry from stock. The differences: NiroSan reaches up to 168.3 mm (Sanpress Inox up to 108), NiroSan fittings are 1.4404 (Sanpress Inox 1.4401), NiroSan can be pressed up to 54 mm with V or M jaws of other manufacturers, Sanpress Inox only with Viega tools. In practice the installer's existing tools and the size often decide – and the rule from our experience: one system per project, with several the same profile (see From our practice).

Installation in brief

• Cut the pipe with a pipe cutter, deburr outside and inside; mark the insertion depth.
• Push the fitting on (Push & Stay holds it), press jaw SA, V or M up to 54 mm; from 76.1 mm press ring, 139.7/168.3 mm press loop M.
• Leak test wet or dry; unpressed fittings show up during the pressure test.
• Fixed and sliding points, clamps with insert; avoid temper colours from welding work nearby.

Availability at Zickwolff

The standard names dimensions. What is listed here, we carry – from stock or to order; how quickly something is available we clarify on request. We stock NiroSan 15–54 mm and 108 mm; 76.1, 88.9 and 168.3 mm are to order; NiroSan Gas and NiroSan Industry we procure through Sanha. Plus NiroSan pipe in straight lengths.

Further reading

Tools of this section: system finder (which system suits medium, pipe and size) · joining methods compared (press, push-fit, grooved, welding, thread, flange, soldering) · cost comparison calculator (assembly time and downtime per method) · press systems overview.

Related metal press systems

Matching items from our range: stainless steel threaded fittings for threaded transitions, flanges and gaskets for flange transitions.