Ductile Iron Pole

Ductile iron has free spherical carbon; however, the carbon within the cast iron appears in layered forms. Therefore, this type of carbon is sometimes referred to as malleable iron and spheroidal graphite (SG) iron in the United States and Britain, respectively. Due to its favorable properties, ductile carbon has gained significant popularity since its discovery in 1148. One of the advantages of ductile cast iron is its corrosion resistance, which allows this metal to perform reliably in corrosive environments. The protective layer formed on this metal during the production process subsequently acts as a corrosion-resistant agent. On the other hand, applying resistant coatings with various properties, including zinc coating, different paints such as polyurethane, bitumen, and epoxy, and non-stick coatings on the surface, such as polyethylene sheathing, can minimize the possibility of corrosion. The lifespan of ductile iron pipes buried in soil is estimated to be 80 years.

Mechanical Properties of Ductile Iron

• Minimum Yield Tensile Strength: 270 MPa
• Minimum Tensile Strength: 3 MPa
• Minimum Percentage Elongation (A): 2
• Minimum Modulus of Elasticity: 165 GPa

Salt spray testing was performed according to ASTM B117. Test results indicate that the corrosion rate of ductile iron is about half that of A588 weathering steel.

Ductile Cast Iron Utility Pole Components

1. Cap

2. Top Section

3. Cross Arm Mounting Holes

4. Two-Part Overlap

5. Overlap Area Bolts

6. Base Nameplate

7. Bottom Section

8. Climber Wire Access Holess

9. Bury Depth

10. Base Cover

Specification Plate

Iran Power Generation, Transmission & Distribution Management Company (Tavanir) provides a plate containing the unique specifications of each utility pole for identifying the poles after installation at the site. This plate includes the utility pole identification number based on the "Distribution Network Equipment Coding" instructions. The identification number specifies the manufacturer's code, equipment code, year and month of production, and a unique sequential serial number for each utility pole.

With the global tracking system in Hamoun Nyzeh Company, each utility pole is traceable throughout its lifespan. All control and quality records of the poles are recorded in this system and are accessible at any time.

Ductile Cast Iron Pole Applications

• Suitable for 33 kV and 20 kV lines
• Areas with high corrosion and humidity
• Areas with corrosive soil
• Tension poles used at the ends and angles of distribution lines
• Upgrading existing distribution lines
• Street lighting pole
• Transformer mounting pole
• Suitable for use in telecommunications equipment and warning signs

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Advantages of Ductile Iron Poles

• Offered in various classes compatible with existing wood and concrete poles.
• Lifespan of over 80 years due to the special coating applied to the pole (due to suitable strength and corrosion resistance).
• 37-year warranty
• One-piece body (no weld seams in the body/pole formed through centrifugal casting).
• Easy to transport and install due to low weight (30% the weight of concrete poles in the same class).
• Beautiful appearance in urban furniture in various colors.
• Resistance to fire and destruction by insects.
• Recyclable raw materials used in the ductile cast iron pole make it a product with high environmental value (green product).
• Easy drilling of the pole body even at the installation site
• Suitable for difficult-to-access areas due to the ability to assemble the pole at the installation site.
• Suitable for areas with variable climates such as snow and ice.
• Short production and casting time for each pole (less than two minutes).

Accessories

1. Pole Assembly On-Site

Ductile cast iron poles can be assembled on the customer's site. The assembly ring is designed for this reason.

2. Installation Without a Crane

One of the advantages of ductile iron poles is the ability to install and assemble these poles manually without using a crane in difficult-to-access areas, due to the light weight of the poles and their two- or three-part design.

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3- Climbing Step Instructions

Climbing step instructions are provided to facilitate and reduce the time to climb the pole (stainless steel, galvanized, or polymer).

Coating Classes Based on the Climatic Conditions of the Pole Installation Site

Coatings for Ductile Iron Poles

The coating classes for the body of buried poles are applied based on the climatic conditions at the pole installation site. Various corrosion-resistant coatings are applied to tapered and conical poles according to their type and location of use. The buried section of the pole is always covered with corrosion-resistant coatings. However, due to the natural corrosion resistance of ductile iron, the upper part of the pole can be designed without any coating. Therefore, the oxide layer can give the pole a distinctive and attractive appearance while also protecting the metal and not posing a threat to the pole's lifespan. Additionally, coatings can be provided in various types and colors based on climatic conditions and customer preferences.

Technical Specifications for Conical Power Poles

Insertion Depth P		Embedded Depth BD	Total Weight	Upper 1Sec. Weight		Bottom 1Sec. Weight			Base Diameter of Bottom 1Sec. D1	Top Diameter of Top 1Sec. D2	2Bottom 1Sec. Height L2		Upper 1Sec. Height L1	Pole Height L	Min Bending Moment at GL	Max Working Tip Load
Upper 1Sec.	Bottom 1Sec.			Upper 1Sec.	Upper Cap	Mid. 1Sec.	Bottom 1Sec.	Floor Covering			Bottom 1Sec.	Middle 1Sec.
(mm)	(mm)	(cm)	(kg)	(kg)	(kg)	(kg)	(kg)	(kg)	(mm)	(mm)	(m)	(m)	(m)	(m)	(KN-m)	(kgf)
-	300	2% of pole height +60 cm	186	25	3/5	-	155	2/5	276	266	6	-	1/5	7/5	2/1	C200
-	300		226	65	3/5	-	155	2/5	276	175/3	6	-	3	1	13/1
-	300		265	25	2	-	155	3	276	115	6	-	6	12	18/1
-	300		230/5	155	5	-	68	2/5	285	188	1/5	-	6	7/5	21/8	C10
-	300		275	155	5	-	112	3	306	188	3	-	6	1	27/1
-	300		361	155	5	-	205	4	348	188	6	-	6	12	37/7
300	330		517	155	5	205	17	6	382	188	3	6	6	15	48/3
300	330		681	155	5	205	304/5	11/5	31	188	6	6	6	18	58/1
-	300		266/5	205	8	-	50	3/5	357	261	1/5	-	6	7/5	32/7	C600
-	300		353	205	8	-	136	4	371	261	3	-	6	1	1/7
-	300		21	205	8	-	280	6	31	261	6	-	6	12	56/5
300	330		660	205	8	280	151	8	62	261	3	6	6	15	72/4
300	330		808/5	205	8	280	304	11/5	24	261	6	6	6	18	88/3
-	300		21	280	11	-	115	5	41	334	1/5	-	6	7/5	4/6	C800
-	300		512	280	11	-	215	6	62	334	3	-	6	1	54/2
-	300		603	280	11	-	304	8	24	334	6	-	6	12	75/4

¹Sec. stands for "Section"
Ductile iron poles with more than 12 meters height are delivered in three sections.
²In ductile iron pole with less than 12 meters height, L2 is the height of bottom section while pole with more than 12 meters L2 is total heights of middle and bottom sections.
All of presented weight are theoretical.

Performance Tests

1. Ductile iron poles are tested from the yield point up to three times the maximum allowable working load and successfully pass all related tests. These tests are conducted by the reference laboratory of the Niroo Research Institute.

2. The performance of ductile iron poles is analyzed using "Finite Element Analysis" software, and the results are validated through practical tests.

Electrical Conductivity Tests

According to conductivity tests performed by the Niroo Research Institute, the electrical conductivity of ductile iron poles is equivalent to a No. 4 copper wire.

The grounding system of ductile iron poles is established through grounding screws embedded in the pole body, which are made of stainless steel. The height of the grounding screw from the ground can be specified at the customer's request.

Standards

Ductile iron poles are manufactured according to the guidelines of Tavanir Company under the title "Technical Specifications and Performance Testing Requirements for Ductile Iron Poles." Furthermore, their performance is tested in accordance with Tavanir directives as well as national and international standards. Hamoun Nyzeh is the exclusive manufacturer of ductile iron distribution poles in Iran.

Final Words

The use of modern technologies in the water and electricity industries not only commits us to providing and establishing essential infrastructure but also paves the way for a bright future for generations to come. This is a milestone for our industry and patriotism, where we have committed ourselves, relying on decades of experience in centrifugal casting of ductile iron pipes and our engineering team, to become the world’s third-largest producer of ductile iron distribution poles. These poles have durability and longevity that can exceed a century and are protected against various damages such as weather conditions, heat, fire, frost, and snow.

Moreover, by producing green and recyclable products and preventing direct or indirect deforestation and the introduction of non-recyclable materials into nature, we fulfill our social responsibility toward the environment. Currently, Hanyco’s ductile iron poles are widely used in Iran and several other countries in harsh and corrosive areas. Due to their lighter weight, transportation and installation of Hanyco’s ductile iron poles are also more cost-effective. We hope that with the development of this product, the electrical industry will become more engineered, affordable, and safer worldwide.