Y-6.1
Flat face flanges with metal-to-metal contact outside the bolt circle: analysis of an identical (Class 1) flange pair: same material: integral (Cat.1) flanges: hub of constant thickness: with spacer: self-sealing gasket with negligible loads
1
Max.allowable working pressure: at top:
2
Max.allowable working pressure: at location:
3
Design temperature:
MATERIALS-BOLTING
FLANGE
BOLTS
4
Product form:
5
Allowable stress: at design temperature:
6
Elastic modulus: at design temperature:
7
Elasticity factor: at design temperature:
8
Effective bolt cross section area: per bolt:
9
Effective bolt cross section area: total:
10
Calculated strain length of bolt:
FORCES AND MOMENTS
11
Hydrostatic end force: total:
12
Hydrostatic end force: inside:
13
Hydrostatic end force: annular:
14
Moment due to HD and HT (HG=0):
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(follows on next page)

Y-6.1
Flat face flanges with metal-to-metal contact outside the bolt circle: analysis of an identical (Class 1) flange pair: same material: integral (Cat.1) flanges: hub of constant thickness: with spacer: self-sealing gasket with negligible loads
(follows from previous page)
FACTORS
15
Shape factor:
16
Bolt hole factors:
17
Factor:
18

19

20

CALCULATION
21
Flange moment due to flange-hub interaction:
22
Slope of flange: at ID: times E:
23
Contact force between flanges at hC:
24
25
Bolt stress: operating:
26
Bolt stress: design prestress:
27
Result for: Bolt stress:
28
Hub stress: longitudinal:
29
Hub stress: allowable:
30
Result for: Hub stress:
31
Radial flange stress: at bolt circle:
32
33
Tangential flange stress: at ID:
34
(SH+SR)/2: at ID:
35
(ST+SR)/2: at ID:
36
Allowable stress: for the above:
37
Result for: Flange stress:
38
Final result:
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