螺栓所需要扭矩的计算



螺栓扭矩计算

项目号 ITEM NO.

Bolt Torque Calculation(Per Pressure vessel design menual)

文件号 DOC. NO.

管口号NOZZLE

N1

一.设计条件 design condition

序号NO.

项目      Item

符号 symbol

数值   data

单位 units

法兰数据flange date

设计压力   internal pressure

P

1

MPa

设计温度   design temperature

T

50

oC

x轴向弯矩  x axis bending moment

ML

10000

N.mm

y轴向弯矩  y axis bending moment

MC

10000

N.mm

总弯矩     total bending moment

M

14142.13562

N.mm

径向载荷   radial load

Pr

200000

N

螺栓螺母和螺母法兰面之间的总摩擦系数     total friction factor between bolt/nut and nut/flange face

K

0.15

两法兰距离 distance of flange

x

250

mm

垫片数据 gasket date

外径  outside diameter of gasket

O.D

157

mm

内径  inner diameter of gasket

I.D

114

垫片宽度 gasket width

N

21.5

mm

垫片密封基本宽度 nominal gasket width

b0

10.75

比压力 gasket unit seating load

y

20

Mpa

垫片系数 gasket factor

m

2

垫片材料在设计温度下的弹性模量         modulus of elasticity of gasket material at temperature

Eg

569

MPa

垫片厚度  thickness of gasket

tg

3

mm

有效密封宽度 effective gasket seating width

8.30

mm

垫片反作用位置直径 diameter at location of gasket load reaction

G

140.41

mm

螺栓载荷 bolting date

螺栓数量 number of bolts

n

8

螺纹根径 root diameter of threads

d

15

mm

螺纹中径 pitch diameter of threads

dm

16

mm

螺栓材料在设计温度下的弹性模量         modulus of elasticity of bolting material at temperature

Eb

29.2

MPa

螺栓截面积  cross-sectional area of bolts

Ab=πd2n/4

1413.72

mm2

螺母厚度 thickness of nut

tn

16

mm

有效螺栓长度 effective length of bolt

lb

266

mm

二.计算 caculation

等效压力         Equivalent pressure

=

1.12

Mpa

液柱静压头      Hydrostatic end force

=

17311.31

N

压紧力 Total joint-contact-surface compression load

Hp=2bπGmPe

=

16363.56

N

螺栓预紧力  Minimun required bolt load for gasket seating

Wm2=πbGy

=

73181.56

N

垫片作用的实际面积   actual joint-contact area of gasket

Ag=2πbG

=

7318.16

mm2

垫片的压缩力 decreasing compression force in gasket

=

17309.38

N

需要的拉伸力 initial required tightening force

Fbo=Hp+ΔF

=

33672.94

N

需要的总力            total tightening force required to seal joint

W=max(Fbo,Wm2)

=

73181.56

N

所需扭矩 required torque

=

21954.5

N.mm