DVAI supplies dished head GRC according to NFE81 102 or Torispherical Head according to DIN28011 for tanks and pressure vessels.
DVAI manufactures your heads and bottoms by 2 differents processes depending on the diameter and the thickness:
- cold press dishing process and flanging,
- spinning forming process.
Dished heads are manufactured from DVAI’s stainless steel plate stock in order to master the quality and deadlines.
TECHNICAL CHARACTERISTICS NFE 81-102 / DIN 28011
Ri (spherical radius) = De (external diameter)
E = Thickness
Rc (knuckle radius) = 0.1 x De
h2 = Ri - √ ((Ri – rc) ² - (K – rc) ²)
With K = 0.5 x (De- 2 E)
Values for DIN28011
Ri = De