P<5 MPa

B=d+2.4

B= d+0.9

P=5~10 MPa

B=d+1.6

B= d+0.7

P=10~20 MPa

B=d+0.8

B= d+0.4

P=20~30 MPa

B=d+0.5

B= d+0.2

P=30~40 MPa

B=d+0.34

B= d+0.1

D<60

C=4

D1=D-1

D=60~120

C=5

D1=D-1

D=120~180

C=6.5

D1=D-1

P=180~250

C=7.5

D1=D-2

P=250~400

C=10

D1=D-2

h<7

HA=h+0.5

h =7~8

HA=h+0.8

h>8

HA=h+1.0