Fiberglass manhole covers are increasingly more popular than metal products due to lower costs, higher mechanical and hydraulic resistance, higher chemical and thermal resistance, and fire resistance, corrosion resistance to chemicals . Fiberglass come from a combination of materials and polymer resins and other chemicals. Metal manhole covers have numerous problems in using due to breakage of valves, rust, decay and recyclable materials so the inquiry for the Fiberglass ones is highly increasing. Fiberglass manhole covers (GRP) are produced with the SMC (sheet molding compound) process. Matin Fiberglass manhole covers have the national standard of Iran. Manholes have different working classes according to the location,.
Fiberglass manhole covers have different applications and can be used for items such as telecommunication and electricity. Depending on the type of application of the Fiberglass manhole cover the strength is different for the use of traffic or non-traffic, and they have different prices. Hence, the genus is different, and if we want a higher resistance Fiberglass , the Fiberglass differs and affects the price of the Fiberglass manhole covers.
Advantage of Fiberglass Manhole Covers:
Since they are non-recyclable materials, they are not in the danger of being stolen
Corrosion Resistant( especially decay and acidity)
Having an anti UV to resist sunlight
Suitable for any type of climate and high temperature and below zero
Lightweight valve and at the same time resistant to high pressures
Color variation and design based on the principles of the city's aesthetic
Preventing the sound from passing through the cover
Manhole are used to inspect and repair installations, pipes and sewage. In fact, all the sewage of the building is directed to one part. Sewage is considered as one of the most important parts of buildings and houses, if not sanitized, would cause irreparable damage to the city's image and urban communities.
The manhole cover is a door on the manhole to prevent people from falling into the pit and use grappling hooks to remove them. The features of these types of valves are resistance to pressure, chemicals, and changes in water and weather conditions, and do not require any color, and they are ductile and lightweight against electric current, and their installation and transportation are very simple.
One of the disadvantages of cast iron comparing to Fiberglass ones is its high weight and robbery since metal is valuable and can be reuse again that is why they are theft’s target.
The importance of health is an undeniable fact which should not be overlooked in all places especially schools, commercial complexes, parks, etc.
Fiberglass manhole can be used in sewage inspection rooms, underground cabling, telecommunication cabling, water, oil and gas installations, and beautification of gardens and landscapes.
Manholes can also be used differently from the compression they are able to handle.
The A15 can withstand 1.5 tons, and they can handle pedestrians and bike crossings.
The B125 can withstand 12.5 tons and are used for sidewalks and car park areas.
The C250 group is used to push 25 tons and the margin of streets and tables.
The D400 is used to push 40 tons and parts of the car on the main street.
The E600 can withstand a pressure of 60 tons and can be used in heavy duty vehicles such as terminals and airports.
The F900 can withstand a pressure of 90 tones and areas where heavy vehicles stand.