CIVIL WORKS GUIDELINES FOR MICRO-HYDROPOWER IN NEPAL
165
Steel Industries P. Ltd.
G.P.O Box 4129. Kanlipath, Jamal.Kaihmandu. Napal. Tel: 977-1-253047, 228389. 243452, 252475. 252850,
Fax: 977-1-220612 Factory : Simra. Bara. Tel: 977-53-20075, 20078, 20170. Fax: 977-53-20160
STRUCTURAL
STEEL PIPES
Structural steel pipes are manufactured in the same process as water pipes. However, the steel used is of
higher tensile/yield strength. We normally use high grade steel with tensile strength of 42/55 kgs/cm as per
customers requirements. We normally use the steel as per JIS: G-3132, SPHT2,3or4, or IS: 11513/1985 for
the pur-poses. Structural pipes are basically used for manufactur-ing poles and welded structures. Use of
high grade struc-tural steel reduces steel consumption drastically Pipes of structural grade normally conform
to IS: 1161/1979, JIS: G-3444/1993, BS: 1387/1985.
HIPCO STRUCTURAL TUBES
NOMINAL
BORE
mm inch
15 1/2
20 3/4
25 1
32 11/4
40 11/2
50 2
65 21/2
80 3
100 4
125 5
150 6
175 7
200 8
OUTSIDE
DIAMETER
mm
21.30
26.90
33.70
42.40
48.30
60.30
76.10
8890
114.30
139.70
165.10
193.70
219.10
CLASS
L
M
H
L
M
H
L
M
H
L
M
H
L
M
H
LI
L2
M
H
L
M
H
L
M
H
L
M
H
L
M
H
L
M
H
L
M
H
L
M
H
THICKNESS
mm
2.00
2.65
3.25
2.35
2.65
3.25
2.65
3.25
4.05
2.65
3.25
4.05
2.90
3.25
4.05
2.90
3.25
3.65
4.50
3.25
3.65
4.50
3.25
4.05
4.85
3.65
4.50
5.40
4.50
4.85
5.40
4.50
4.85
5.40
4.85
5.40
5.90
4.85
5.60
5.90
WEIGHT
(BLACK PIPES)
kg/m
0.96
.22
.45
.42
.58
.90
2.04
2.46
2.99
2.61
3.15
3.86
3.27
3.61
4.43
4.14
4.57
5.10
6.17
5,84
653
7.92
6.86
8.48
10.01
9.97
12.10
14.50
14.90
16.20
17.90
17.80
19.20
21.20
22.60
25.00
27.30
25.70
29.40
31.00
AREA OF
CR. SECTION
Cm
1.21
1 55
1.84
1.81
2.02
2.41
2.58
3.11
3 77
331
4.00
4.88
4.14
460
5.63
523
5.82
6.50
7.89
7.44
8.31
10.10
8.74
10.80
1280
12.70
15.50
18.50
19.10
20.50
22.80
22.70
24.40
27.10
28.70
31.90
34.80
32.60
37.60
39.50
MOMENT OF
INERTIA
Cm
0.57
0.69
0.77
1 38
1.50
1.72
3.14
365
4.22
6.57
7.71
9.07
10.70
11.73
13.90
21.59
23.77
26 17
30.90
49.44
5465
65.12
80.31
97.38
11346
194.39
234.32
274.54
437.20
467.64
514.49
732.57
784.49
864.69
1284.00
1416.96
1536.11
1874.06
2141.59
2247.00
SECTION
MODULUS
Cm
0.54
0.65
073
1.02
1.12
1.28
1.86
2.16
2.51
3.10
3.64
4.28
4.43
4.86
5,75
7.16
7.89
8.68
1020
13.00
14.40
17 10
18.07
21.91
25.53
34.01
41.00
48.04
62.59
66.95
73.66
88.74
95.03
104.75
133.00
146.30
159.00
171.07
195.49
205.11
RADIUS OF
GYRATION
Cm
0.69
0.67
0.65
0.87
086
084
.10
.08
.06
41
39
.36
.61
.60
.57
2.03
2.02
201
1.98
2.58
2.56
254
3.03
3.00
2.98
3.91
3.89
386
4.78
4.77
4.75
5.68
5.67
5.65
6.68
6.66
6.64
7.58
7.55
7.54
Tolerance:
a) Thickness: (+) not limited (-) 10% b) Weight: (+) 10% (-) 8%
c) Outside Daimeter: Upto 48.3 mm, (+) 0.4 mm (-) 0.8 mm, (+) 1%
A JOINT VENTURE BETWEEN