人孔吊柱计算书



吊柱计算书

项目号 ITEM NO.

Davit calculation

文件号 DOC. NO.

1

输入数据 Input Data

吊重Weight

Wo

=

1000

kg

动载系数 Load Factor

K'

=

1.5

吊柱材料Material of davit

20（管）

吊柱外径Outside Diameter

dH

=

114.3

mm

吊柱壁厚 Thickness

δ

=

8

mm

腐蚀裕量CA

C1

=

1.65

mm

吊柱弯曲半径Bend radius

R

=

350

mm

吊臂长度 length of davit

S

=

653

mm

吊柱伸出高度Height of davit

L

=

665

mm

吊柱许用应力Allowance stress of davit

[σ]

=

152

Mpa

吊柱弹性模量Elasticity modulus of davit

E=

=

201000

Mpa

2

吊柱计算 Strength Calculation of Davit

本计算书是参照《石油化工设备便查手册》和化工设备全书的《塔设备》编制。

计算重Weight for calculaiton

W= 9.81 K'WO=

14715

N

1. 动载系数，直接承重的（法兰盖）取1.5或1.65，带滑轮的塔顶吊柱取2.2。

负偏差Thickness negative deviation

C2= 0.125δ =

1

mm

2.塔顶吊柱请删除序号3,4后的计算，并更换图示.

计算外径Calculation OD

d1 = dH-2C1-2C2=

1.090E+02

mm

3.负偏差取12.5%的管子厚度，如有不同，请自行修改。

计算内径Calculation ID

d2 = dH-2δ =

98.3

mm

吊柱横截面积setcion Area of Davit

A= π(d12-d22)/4 =

1742.1

mm2

系数Factor

K = (d12+d22)/16R2=

1.099E-02

吊柱压应力 The compress stress

σ1= W{1+S[d1/2K(R-d1/2)-1]/R}/A =

257.1

MPa

σ1

>

[σ]

强度不满足要求,It is NOT safe.

系数Factor

k=sqrt(d12+d22)/4 =

36.69

力臂长度 Force arm

l =L-R =

315.00

mm

Q2=

Q=

SecQ=

系数Factor

Q2=W(l/k)2/EA =

3.097E-03

3.097E-03

0.05565

1.00155

吊柱应力Davit stress

σ2=W[1+d1S(1+0.5Q2)/2k2]/A =

232.04

MPa

应力精确解

232.04

σ2

>

[σ]

强度不满足要求,It is NOT safe.

3

吊钩计算 Strength Calculation of Hook

吊钩根径 Root Diameter of Hook diameter

dr

=

20

mm

吊钩材料 Material

20

吊钩许用应力Allowance stress

[σ]H

=

167

Mpa

计算直径Dia.of Hook Cal. diameter

d=dr-2C1=

16.7

吊钩应力Hook stress

σ3=4W/πd2 =

67.18

Mpa

σ3

<=

[σ]H

强度满足要求It is safe.

4

吊环计算 Strength Calculation of lifting ring

吊环许用应力Allowance stress

[σ]R

=

167

Mpa

吊钩直径 Root Diameter of lifting ring

d4

=

26

mm

吊环长度 Length of lifting ring

l4

=

140

mm

计算直径 Calculation Diameter

d4'=d4-2C1=

22.70

mm

吊环应力 lifting ring stress

σ4=Wl4/（8x0.0982d4‘3） =

224.19

Mpa

σ4

>

[σ]R

强度不满足要求,It is NOT safe.