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An Overview of Manhole Covers Manufacturing In India

top manhole cover manufacturing in india - Govind Steel

The proper disposal of human waste has been solved by the sewage systems built across the various parts of our nation. And what keeps the sewage system separate from the actual city are the manhole covers. The history of the manhole covers is rather varied – what started as stone manholes covers are now made of cast iron.

How are Traditional Manhole Covers manufactured?

Most top manhole covers manufacturing is carried out cast iron foundries as the modern-day manholes are made out of cast iron. The process is fairly simple theoretically – the cast iron is melted and then poured, or cast, into a mold. In many cases, ductile cast iron is also preferred because of its greater strength and is generally found in and around airplane terminals. What adds more strength and durability to the manhole covers made of gray cast iron is the alloying element(s) – carbon and silicon. And in the case of ductile cast iron manhole covers, manganese is added to the molten iron that provides greater strength and malleability.

What are the Raw materials used besides Cast Iron?

Apart from iron, the other raw materials required in manhole cover manufacturing is green sand -which is sand bound together with clay. It is mainly used to produce the molds which are further used to store the molten iron. The sand mixture is about 90% silica sand, 4-10% clay, 2-10% organics and 2-5% water.

Design & shapes

All manhole covers are first structured in aluminum or wood as a model. This model serves as the key design and is used as a reference to make the mold and then the molten cast iron is poured. The intricate designs on the surface are often created by skilled artisans who personalize them. Coming to the shape of it, all manhole covers are round since it cannot go beyond its assigned diameter. Round manhole covers are convenient to move around as they can be rolled.

Assessment of the Quality

The key to controlling the quality of manhole covers is assessing the proper percentages of iron, carbon, and alloying metals. Once the casting is complete, the strength and ductility of the cast irons are tested to assure reliability. And lastly, the strength and ductility are determined by casting bar test specimens from the same metal used to cast the manhole covers.

Govind Steel is one of the leading foundries of India with an installed capacity of 24,000 MT. Apart from that, Govind Steel has been recognised as one of the top manhole covers manufacturing companies in India as well. Please visit our website at www.govindsteel.com to know more.

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Why choose ductile iron manhole cover over cast iron?

ductile iron manhole covers

When it comes to manhole covers, traditionally, they are made using cast iron. But over the years with the introduction of new and improved forms, ductile iron has proven itself as a great alternative. Many pieces of research later, it has been found that ductile iron is considered a better choice than cast iron because it can resist the same traffic loads with relatively lower self-weight and are less brittle than cast iron. Here is a list of its core strengths:

Bend It Like Ductile

Unbreakable yet bendable, ductile iron manhole covers are made from materials like carbon, silver, sulfur and magnesium. These materials tend to add strength and make it more durable in the longer run. But apart from lending to the superb quality, ductile iron manhole covers are easily bendable and have zero risks of breaking. This makes it a perfect choice as it contributes to structural agility.

Easily Compressible

The compressive strength of any metal contributes majorly to its choice of application. To further define, ductile iron has higher compressive strength as compared to any other form of metal. This form of metal can withstand any shape and any intensity of strength thus they prove to be better than cast iron.

Corrosion resistance and core strength

Manhole covers take the brunt of all-natural bodies like rain, sun, frost, and all its extremities. What works wonders, in this case, is the fresh coat of polish that can support the cause. Ductile iron, fortunately, is wear-resistant and corrosion-resistant and does not require the polish to function smoothly. Not only that, but the corrosion resistance also adds to the overall life of the manhole covers.

Low maintenance

Ductile iron, owing to all its properties, is extremely low maintenance and does not pose any harm to the safety hazards of the workers. Since they are easy to lift, low on weight and easy to clean, the pipe maintenance and other sewage conditions make it an ideal choice. It is way less brittle than cast iron thus is designed to be in the manhole frames and holds them perfectly.

To know more about ductile iron manhole covers, visit www.govindsteel.com and read about their history, experience and the high-quality manhole covers provided by them.www.govindsteel.com.

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An Overview of Ductile Iron Manhole Covers

ductile manhole covers in India - Govind Steel

Depending on the application and requirements of an area, the accessibility and precision of ductile iron manhole covers are defined. However, one crosses by and witness a manhole cover everyday, no one pays attention to the details. The details as to how sturdy, long-lasting, and efficient they are for the required area of application. For the ones who know little about it, let us take a quick look at it.

What are Manhole Covers & why are they important?

Pretty much what the name suggests, Manhole Covers are removable iron, cast iron or ductile iron plates that essentially cover the opening of a manhole to prevent objects and people from falling into it. If you’re installing a new manhole cover or you’re replacing an existing one, measuring the space is key. Finding out the basics of a manhole cover is important to assure a perfect fit and zero-compromise with structural integrity.

What are the different types of Manhole Covers?

Ductile Iron Manhole Cover  

Strong, sturdy, resilient and heavy-duty, ductile iron manhole covers are used over a D400 class. The main purpose of using Ductile iron, also known as cast iron, is because of its strength. This type of manhole cover is used to add a long life span to any application. This kind is particularly used for installation in airports, docks, and other heavy-duty industrial areas.

Recessed Manhole Cover 

More like a holder or an outline structure, Recessed manhole covers essentially have a cut out in the tray so that bricks, paving bricks, cement, and other pavements can be installed. Since the cover is hardly visible, this allows the recessed manhole cover to blend in with the surroundings. It is useful for pedestrian walkways, side footpaths, etc. It’s also an excellent solution for internalized manhole covers. For example, hospitals, workshops, organisations, and societies.

Solid top Manhole Covers 

Places where safety and maintenance need to highlighted, Solid top manhole covers are used for those areas. The idea behind designing these covers is to highlight prominence on a specific floor or a certain area to keep people away from it. These are installed in the areas where one needs to highlight a certain architecture as opposed to hiding it. It is an anti-slip surface where the top is visible or even raised too. The starking contrast between the solid floors and the solid top manhole covers makes them easy to identify.

Where to find the best Ductile Iron Manhole Covers in Kolkata?

Govind Steel Company Limited is a 55-year-old Brand, making it one of the best foundries in India. We have a varied range of products like Ductile Iron Manhole Frames, Covers and Grates, Surface Boxes, Valve Boxes, Counter Weight, Industrial Castings, Manhole Frames and Recessed Covers, etc. For more information about foundries and to view our varied range of products, call us on +91 33 25309445, or leave us a mail on info@govindsteel.com and be rest assured to get a reply within 24 hours. You can even visit us at 219, Chittranjan Avenue, Kolkata – 700 006.

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Manhole Covers: History, Characteristics & More

There are many everyday objects that we come across and never wonder about. From something as simple as a comb while grooming ourselves in the morning to the manholes we cross over as we walk down the roads. Have you ever wondered what goes behind making the cover of a manhole? Manhole covers date back to the era of ancient Rome when they were made of stone.

Manhole covers, as we all know are the removable lids atop a manhole, usually big enough for a person to pass through. They are used to access underground pipelines and vaults. They started off as slabs of stones and sometimes, pieces of wood and this continued till the 18th Century. In the 19th Century, modern ductile manhole covers were developed. For the last 200 years, manhole covers are made of cast iron in varied designs.

While circular manhole covers are what we frequently come across, manhole covers are also available in different shapes like rectangle and square and varied sizes. There are also triangular manhole covers in some parts of the world. Here are some interesting characteristics of different types of manhole covers:

  • Choosing the right cover: When searching for the right manhole cover, many factors have to be considered. Construction, dimension specification, as well as the positioning of the manhole, have to be kept in mind while purchasing the manhole cover.
  • Division as per weight: Different manhole covers weigh differently, depending on the load they have to deal with. A manhole cover on an airport runway will have to be much heavier than a cover on the road, whereas one on a pavement which has only pedestrians and cyclists is lighter.
  • Locking of manhole covers: As an extra measure of security, manhole covers have the option of being locked up or welded, especially in case of manholes on roads where racing occurs. It may sound bizarre, but often manhole covers are stolen to be sold as metal scrap.
  • Difference between shapes: A round manhole cover is often chosen because the chances of it falling through its circular opening are very low whereas it is possible with square covers. They are much smoother, have smaller surface area, are easily movable as well as easy to lock in place.

Ductile manhole covers and manhole frames are invisible products that make our life smoother. Made of cast iron, they are sturdy and essential for the running of any city. Govind Steel, a leading foundry in India constructs varied types of manhole covers and frames as well as manhole grates. They have different shapes, sizes and designs along with other cast iron and steel products. To check out their vast range of products, visit http://www.govindsteel.com.