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Anonymous Poster #1

Steel tubular poles

09/10/2022 10:09 AM

Dear sirs,

Steel tubular poles are of two types: stepped type and swaged type. What is the diff?

regards,
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Randall
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#1

Re: steel tubular poles

09/10/2022 11:16 AM

The following is from

https://indiapoles.in/products-india-electric-poles-manufacturing-company/

1. ISI MARKED STEEL TUBULAR STEPPED POLES OR SWAGED POLES FOR OVERHEAD POWER LINES AS PER IS: 2713 (1980).

“BIS LICENSE FOR ISI MARKS”
Click Here To Download

Stepped Type Poles:

Stepped poles shall be made from one length of erw tube, the diameter being reduced in parallel steps by passing the tubes through series of dies. The tubes shall have only one longitudinal weld seam.

Swaged Type Poles:

Swaged poles shall be made from erw tube of suitable lengths swaged and joined together and a circumferential weld shall be deposited at the upper end of the joint at a slope of approximately 45 °. (see fig. 1). No circumferential joints shall be in the individual tube lengths of the poles.

After complete fabrication of poles, deflection test, permanent set test & drop test are carried out on randomly selected poles as per is: 2713. After passing all the above tests, the poles are isi marked, painted or hot dip galvanized as per buyers requirment & dispatched.

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Anonymous Poster #2
#2

Re: steel tubular poles

09/10/2022 5:20 PM

Be careful which Pole you swage.
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PWSlack
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#3

Re: steel tubular poles

09/10/2022 6:12 PM

The manufacturers' sales literature will indicate these things. They can't be seen from here.

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redfred
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#4

Re: steel tubular poles

09/10/2022 6:23 PM

About $50.

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Lehman57
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#5

Re: steel tubular poles

09/10/2022 11:26 PM

Add a third type. The company I worked for made TAPERED tubular poles; they could have several sections from top to bottom; the sections were joined by telescoping one over the other sort of like the Morse taper on machine tools. Our poles were round; I think the manufacturers left on the market all make polygon poles, and some may be elliptical polygons.

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Stef
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#6
In reply to #5

Re: steel tubular poles

09/11/2022 2:36 AM

I have assembled and stood the tapered poles and the swaged type both round, hexagonal and square. There was no welding done on the swaged type where the lower section slid inside an expanded section of the next upper section. The two pieces were then hydraulically force together with a steel cable through a 20T hollow ram.

The tapered type were limited in height to what could be easily transported fully assembled on road transport. The swaged type could be made to a suitable length with each section around 10 to 20m. We had a series of square ones 50m in height which could be lowered in a tilt over fashion by a very large hydraulic ram. These were carrying hardstand lighting. Swaged ones have the ability to be broken down and damaged sections replaced. Tapered units have to be replace as a unit. They see much use in street lighting over this side of the pond.

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Lehman57
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#7
In reply to #6

Re: steel tubular poles

09/11/2022 3:09 PM

We may be talking about different types. It's been a long time, but we made and shipped, with special permits, poles over 100 feet long for area lighting on interstate highways. All welding was in the shop--none in the field. High-tension transmission poles, which I did, could be up to 100 inches in diameter, but many/most were more like 40 inches in diameter at the base. The telescoping joints were assembled at erection; after some use, they could be taken apart with some difficulty, because they tend to lock together. Loads could be huge; most were much less, but I think we had at least one design job with a conductor tension of 40000 pounds.

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PWSlack
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#8

Re: Steel tubular poles

09/12/2022 11:11 AM

Swaging is a form of stepping. Stepping is not a form of swaging.

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