From semi-manufactured products to end products

Nijhuis & Wigger is well-capable of processing and adapting both flanges and fittings. In our warehouse you can find semi-finished flanges that can be machined in several ways without any loss of quality. These processes are performed in compliance with EN or ASME standards, resulting in a compliant end product.

Frequent ways of machining flanges in accordance with EN1092-1:

  • Changing schedule sizes
  • Adjust sealing surface to Smooth Finish (SMF) Ra. 3.2-6.3 or other customer specific roughness
  • Adjust sealing surface for example: Type B1 / B2 to Type A
  • Feder DIN2512 (Form C) / Nut DIN2512 (Form D)
  • Vorsprung V13 (Form E) / Rucksprung R13 (Form F)
  • O-Ring-Vorsprung R14 (Form G) / O-Ring-Nut V14 (Form H)
  • Tapping NPT/ BSP threaded hole
  • Changing flange type (Welding Neck flange SOLID to Blind Flange / Welding Neck to Loose flange)

Frequent ways of machining flanges in accordance with ASME B16.5 / B16.47:

  • Changing schedule sizes
  • Adjust sealing surface to Smooth Finish (SMF) Ra. 3.2-6.3 or other customer specific roughness
  • Adjust sealing surface for example Raised Face (RF) to Flat Face (FF)
  • Machine sealing surface to Large and Small Male / Female
  • Machine sealing surface to Large and Small Tongue / Groove
  • Ring Type Joint (RTJ) out of Large Raised Face (LRF)
  • Raised Face (RF) out of Large Raised Face (LRF)
  • Tapping NPT/ BSP threaded hole
  • Changing flange type (Welding Neck flange SOLID to Blind Flange / Welding Neck to Socket Weld flange / Slip On flange to Lap Joint flange)
  • Machine Welding Neck flange to Orifice flange

Frequent ways of machining fittings in accordance with EN1092-1 and ASME B16.9:

  • Tapering schedule sizes from both Elbows as well as Reducers, Tees and Caps

Frequent ways of surface treatment:

  • (Glass bead) blasting
  • Galvanizing (Hot Dip, Electrolytical)