Manhole covers are usually applied on high-load sites such as airports, roads, and industrial locations, so these tend to follow a strict standard of industry practice, making them strong enough to bear heavy weights and environmental exposure. Manhole covers are categorised by load classes ranging from D400 to F900 according to standards like EN 124, which are frequently utilised for this purpose. The maximum weight that each load class can support is indicated via this load classification. The ASTM standards offer the quality and material guidelines for products to ensure safety in application.

The significant export standards that manufacturers of airport manhole covers use are:

F900 load classification:
 
The top load-bearing standard is the F900 classification, which denotes manhole covers’ ability to be exposed to the maximum loads. These covers carry up to a load of 900 kilonewtons, which is equivalent to approximately 90 metric tons, and are therefore suitable for airports as well as on heavy ground support, exerting tremendous weight and pressure on surfaces. It is an internationally recognised and frequently used export standard requiring maximum load-bearing. The projects are mainly found in the global markets and include the regions of Asia, the Middle East, and parts of North America. Therefore, if the manufacturers stick to the standard of F900, their products will be able to meet the manufacturers’ requirements, making exporting the manhole covers convenient. Airport manhole covers manufacturers normally ensure that the manhole covers adhere to heavy-duty standards as well as durability standards.
 
ASTM standards:
 
ASTM standards apply to manhole covers, particularly ASTM A48 standards used for airport manholes, primarily concerning grey iron castings and ductile iron manhole covers. The ASTM standards ensure cover products to be robust for impact resistance. Mostly it is applied in line with EN standards if designing products to be sold around the globe, mainly to enable compatibility between requirements in the United States as well as the international export market. ASTM standards are recognised as standards for performance and safety. Moreover, the ASTM A36 standard is used to make steel riser rings, which can be galvanised following ASTM A123. They help in guiding the material’s composition, strength, and durability. They are specifically made to accommodate minor variations in manhole rings.
 
EN 124 standards:
 
Airport manhole cover manufacturers must meet stringent export standards, especially those involving safety and load capacity. Alignment with the EN 124 standard also helps manufacturers meet international standards. Airport manhole covers are often made of ductile iron, which offers ductility and resistance to corrosion. This standard meets the requirements of anti-slip surface designs, making it essential for wet or icy conditions. Products must be marked with EN 124 compliance, specifying the load class and the origin. This is crucial for international exports, as it assures the buyers and authorities. Airport manhole covers may need to meet some additional standards, such as ASTM standards.
 
HS code for export manhole covers:
 
The HS (Harmonised System) code is a standardised numerical method used to classify traded products. Manhole covers are classified under the code 73251000, which are often used in applications such as airports. HS codes are classified on their functionality and material quality. This category includes cast iron or steel manhole covers. They do not directly cover standards or specifications. Exceptionally large covers might require specific subclassifications or additional documentation. Airport manhole covers that meet specific export standards would indicate compliance in their product documentation. It may be beneficial to speak with local customs if the goods need extra documentation for customs in a particular country.
 
Conclusion:
 
Airport manhole cover manufacturers provide the most comprehensive requirements since they specially design them for high-load environments in airports. They comply with the international infrastructure requirements for safety. The ASTM standards by the American Society are standards that provide specific information regarding material requirements. These standards guarantee that manholes and other similar product requirements regarding applications are harmonised.
 
Crescent Foundry is one of the leading manufacturers and exporters of cast iron, counterweights, ductile iron castings, and manhole covers. Since 1982, Crescent Foundry has been pushing its boundaries by maintaining all international standards rigorously in the field of foundry solutions. We rank among the largest and globally recognised cast iron solution providers in the Asian market. Several prestigious products bear testimony to our commitment to maintaining the highest quality standards that adhere to at every stage. In terms of the most reliable cast and ductile iron manhole covers for airports, we are the most trusted manufacturer and exporter from India.