Variable list

Variables

Fig 2 Design factor C_E of rectangular or oval plates

Type A

d	Inside diameter of opening
D₁	Design diameter
f	Narrow side of elliptical end

Fig. 21 – Design factor CA for flat ends and plates without additional boundary moment

Type B

d	Inside diameter of opening
D₁	Design diameter
f	Narrow side of elliptical end

Fig. 21 – Design factor CA for flat ends and plates without additional boundary moment

Type A

d	Inside diameter of opening
d_t	Bolt circle diameter
d_D	Gasket diameter
f	Narrow side of elliptical end

Fig. 22 – Design factor C_A1 for plates with additional boundary moment

Type B

d	Inside diameter of opening
d_t	Bolt circle diameter
d_D	Gasket diameter
f	Narrow side of elliptical end

Fig. 22 – Design factor C_A1 for plates with additional boundary moment

Type
(sketch only)

Conditions

Design
Factor C

a) flanged flat end

1. Knuckle radius:

2. Cylindrical part: h ≥ 3,5s (Please note conditions from section 6.1.1!)

0,30

b) forged or pressed flat end

1. Knuckle radius

However at least 8 mm.

2. Cylindrical part h ≥ s (Please note conditions from section 6.1.1!)

0,35

c) flat plate welded into the shell from both sides

Plate thickness

s ≤ 3 s₁

0,35

s > 3 s₁

0,40

Type (sketch only)	Conditions	Design Factor C
d) bolted flat plate with full face gasket	D₁ ≥ D_i	0,35
e) flat plate with stress-relieve groove ¹⁾ s₁= Final wall thickness of cylindrical part of the end connected to the shell.	1. Residual wall thickness in the groove: , not less than 5 mm and with D_a > 1,2 D₁ s_R ≤ 0,77 s₁ 2. Groove radius: r ≥ 0,2 s, however not less than 5 mm and 3. Only killed steels may be utilized. When plate material is employed over an area of at least 3 s₁ in the weld zone there must be no evidence of material discontinuities in the plate ²⁾. 4. For special loads e.g. creep structure strength, this type is inappropriate without extra proof. 5. Please note conditions from section 6.1.1!	0,40
f) flat plate welded onto the shell from both sides	Plate thickness:
	s ≤ 3 s₁	0,40
	s > 3 s₁	0,45
	Only killed steels may be utilized. When plate material is employed over an area of at least 3 s₁ in the weld zone there must be no evidence of material discontinuities in the plate ²⁾.
g) simply supported flat plate	Residual wall thickness at the gasket circle or at the grooves s_R ≥ 0,7 s	0,40

Type (sketch only)	Conditions	Design Factor C
h) flat plate welded into the shell from one side only	Plate thickness:
	s ≤ 3 s₁	0,45
	s > 3 s₁	0,50
i) partially-welded flat plate	Plate thickness:
	s ≤ 3 s₁	0,45
	s > 3 s₁ Conditions for a: a ≥ 0,5 s and a ≥ 1,4 s₁ D_f /D₁ ≥ 0,7	0,50
k) flat plate attached from the external side	1. Residual plate thickness at gasket circle: s_R ≥ 0,7 s 2. Soft gasket D₁ ≤ 500 mm	1,25
l) flat plate attached from the internal side	Residual wall thickness at gasket circle: s_R ≥ 0,7 s	0,45
¹⁾ Stress-relieve grooves with different cross section may be more effective in reducing stresses and are acceptable if appropriate evidence is produced. ²⁾ The test for non-doubling in the area of the weld seam is carried out for ferritic materials according to DIN EN 10160, quality class E 3, and for austenitic materials according to DIN EN 10307, quality class E 3.