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Tank Head - Dished and Flanged Heads

DISHED AND FLANGED HEADS price request

DVAI is the specialist of stainless steel dished heads and bottoms according to different standards.

A dished head is constituted by a spherical cap, a toric element and a cylinder-shaped edge.

  • PRC : Small knuckle radius head NFE 81-101 or Shallow head
  • MRC : Medium knuckle radius head NFE 81-104
  • GRC : Large knuckle radius head NFE 81-102 or Klöpper head, DIN28011
  • Elliptical head NFE 81-103 or Korbbogen head, DIN28013
Head GRC head PRC
Head MRC Elliptical Head


DE: external diameter
E: nominal thickness
RI: spherical radius
RC: knuckle radius
H2: theoretical internal arrow
H1: straight edge height

 

DVAI manufactures Heads according to PED 97/23 EC for pressure vessels. The stainless steel material is certificated according to Pressure Equipment Directive (97/23/EC).

 

TOLERANCES ACCORDING TO NFE 81 100


- Expansion length tolerances:

  • Case of MRC and PRC: 

- If De <= 2000: 0/+6 mm

- If De > 2000: 0/+10 mm

  • Case of GRC and ELL:  

- If De <= 6000:          +/- 0.003 x De
- If De > 6000:            +/- 0.001 x De


- Thickness tolerances: minimal thickness = 85% of nominal thickness


- Depth tolerances h1 + h2:       

  • Depth <= 6mm : +/- 0.0075 x De
  • Depth > 6mm : +/- 0.01 x De
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