12M Swaged Tubular Pole Durable For Overhead Electric Lines 11KV Or 33KV

12M Swage Tubular Steel Poles in overhead electric lines 11kv or 33kv

1. Scope

1.1 This Specification covers the design, fabrication, testing and supply of tubular steel

poles commonly used in overhead electric lines.

2. General

The steel pole shall be fabricated in several lengths and strengths as specified in

Table 1 contained herein.

2.1 The steel tubular poles must be manufactured by a company approved to quality

standard ISO 9001:2000. The ISO 9001 certification number, the name of the

authorized approving authority with the contact address and telephone and fax

numbers shall also be stated. The Bidder shall enclose a copy of the ISO 9001

certificate with the bid .

3. Description

3.1 The steel poles shall be of swagged design and shall consist of three (3) separate

lengths of steel tubing swagged at two joints to fabricate the poles. However, there

are some numbers of poles as mentioned in the price and delivery schedule which

shall be of folding type. The quantities of such folding poles shall be intimated at the

time of contract.

3.2 The steel tubing used in pole fabrication shall be of steel of any approved process

possessing a minimum tensile strength of 42 kg/sq. mm and a chemical

composition of not more than 0.06% sulphur and not more than 0.06%

phosphorous.

3.3 The tubing diameter and tubing wall thickness shown in Table 1 for each length of

pole are the minimum size to be used in fabricating each length of pole. It shall be

the responsibility of the Bidder to determine the adequacy of the component tubing

shown for the load to be sustained. However, in no case the tubing diameter and

wall thickness for any component tube be less than the value shown in Table 1.

3.4 Tubular poles shall be made of welded tubes, swagged and joined together. The

upper edge of each joint shall be chamfered at an angle of about 45-degree. The

steel poles shall be composed of three sections of diminishing diameters and

minimum diameter thickness and lengths of pole shall be as shown in Table 1.

3.5 All tubes forming parts of the above supports shall be made from hot insulated

seamless or continuously welded steel in accordance with BS 6323 or equivalent

applicable Standards.

Chapter 2. Technical Specification for 11kv lines 2-2

GSEEP/W/ICB-03 2073/74-03

3.6 The entire section of the poles shall be galvanized with minimum coating of weight

not less than 460-gm/-sq. m internally and externally.

3.7 Each pole shall be provided with a steel top plate 3-mm minimum thickness

welded to the end of the section. The top plate shall not project beyond the

perimeter of the top section. Each pole shall also be provided with a welded base

plate welded to the bottom of the pole.

3.8 The pole shall, be drilled in accordance with the drilling patterns as defined in the

Figure. All the holes shall be of 18 mm dia. However, the manufacturer must get

approval of the drilling pattern before manufacturing the poles. Each pole shall be

marked with the appropriate length as shown in Figure.

3.9 The folding type of poles shall be fabricated in such a way that the section pieces

can be carried to the site and fitted on the site itself. The pole section on top shall

have a flange and the section under it shall overlap to a length of 25 cm as shown

in the diagram. The poles shall be drilled in such a way that the section in top

could be securely fixed the section under it by two bolts of 5/8" x 7" at 90 degree

each other. Two such joints form a complete pole of three sections as shown in Fig

2 and 3.

3.10 The size of the base plate shall be as per governing standard.

4 Tolerance

4.1 The following tolerances shall be maintained:

a) Tolerance of diameter: Not Applicable

b) Tolerance on weight: Not Applicable

c) Tolerance on thickness: Not Applicable

e) Straightness: The finished poles shall not be out of straightness

by more than 1/600 of the height.

5. Tests

5.1. The following test (s) shall be performed for the pole furnished. All testing shall be

fully documented and certified test reports shall be provided to NEA.

a Tensile test and chemical analysis for sulphur and phosphorous

b. Deflection test

c. Permanent set test

d. Drop test

Chapter 2. Technical Specification for 11kv lines 2-3

GSEEP/W/ICB-03 2073/74-03

5.2 Number of poles selected for conducting tensile test and chemical analysis for

sulphur and phosphorous shall be as given below:

Lot Size No. of poles

Up to 500 1

501 to 1000 2

1001 to 2000 3

2001 to 3000 4

3001 and above 5

5.3 Number of poles selected or conducting deflection test, permanent set test and drop

test shall be as given below:

Lot Size No. of poles

Up to 500 5

501 to 1000 8

1001 to 2000 13

2001 to 3000 18

3001 and above 20

The deflection test, permanent set test and drop test shall be conducted in

succession on each of the poles selected.