Manhole Cover for Export Quality Made in China

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Loading Port:
Tianjin
Payment Terms:
TT OR LC
Min Order Qty:
1000 m.t.
Supply Capability:
100000 m.t./month

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Item specifice:

Material: Ductile Iron Standard: square Power Supply: DC Power,Gasoline,Diesel,AC Power
Customized: Non-Customized,Customized Surface Treatment: Zinc Plated

Product Description:

1.Ductile Iron Manhole Cover Description :
A manhole cover sits on metal base, with a smaller inset rim which fits the cover. The base and cover are sometimes called "castings", because they are usually made by a casting process, typically sand-casting techniques.
1.Advantages: Good compressive, bending and impact strenth,anti-corrosion, not rust, long service life(at least 30 years). The quality meets the same kinds cast ion manhole covers but the cost is 30% lower than. Contain no metal and no recovery value, anti-theft.
2.Applications: water supply and drainage, fire engineering, natural gas,electricity and telecommunications, street lamp and outdoor illuminations.
3.Color: black, Grey, green, blue and Marble , etc.
4.Inspection: in-house or the third party as per customer's request.

2.Main Features of the Ductile Iron Manhole Cover:
1. Safety options
There is no metal contain, directly reducing potential accident or further maintenance costs caused by thieves. Anti-slip surface offer a safe road condition even in extreme weather.
2. Light weight
Compared with cast iron manhole cover, FRP manhole cover is 30% lighter.
Light weight allows more loading per vehicle, more convenient transportation and economical savings.
Allows a safer working condition, which single workers is enough for installation without risk of injury.
3. Long service life
Strong resistance of acid, alkali, weathering, anti corrosion of water, dust, manhole covers used for gas are well sealed which prevent poisonous gas leaking.
Temperature tolerance is at the range of -40°C-200°C.
Manholes allow access to underground pipes, cables, meters and facilities.
BS EN124 Standard:
A15: Area which can only be used by pedestrians and pedal cyclists.
B125: Footways, pedestrian areas and comparable parks or car parking decks.
C250: For gully tops installed in the area of curbside channels of roads.
D400: Carriage ways of roads(including pedestrian streets), hard shoulder and parking areas, for all types of road vehicles.
E600: Areas of imposing high wheel loads, e.g. dock and aircraft pavements
3.Manhole Cover Images:

Manhole Cover for Export Quality Made in China

Manhole Cover for Export Quality Made in China

4.Manhole Cover Specifications:
1) Production information
Manhole cover are manufactured for construction and public use. Manhole cover shall be smooth and free sand holes, blow holes, distortion or any other defects
2) Material 
A) Ductile iron GGG50
B) Grey iron GG20 
3) Process
A) Molding boards
B) Hand Casting
4) Coating
A) black bitumen or epoxy .
B)Coating as per customer's requirement
5) Different accessories are available
6) Packing:
Wooden case or wood pallet, or as per customers' requirement
7)  Payment terms: T/T or L/C
5.FAQ:
Q. I have a heavy traffic manhole cover but it has been broken by a forklift, why?
A. Forklifts have solid wheels which apply pressure differently to standard pneumatics and therefore covers must be specially adapted to suit this.

Q. I’ve measured my clear opening size but none of your covers match it, can you offer anything?
A. It’s likely that your cover is quite old and in imperial measurements which are no longer manufactured. However, we can offer bespoke solutions with manhole covers made to the specification you require.

Q. The project I’m working on requires a manhole cover with a quality finish, what’s available?
A. Naturally, galvanised steel of black polypropylene aren’t always ideal, and so we offer brass or stainless steel edging, as well as complete stainless steel covers.

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Q:Which is better than the spring washer and the inner tooth?
If you ask this question if it is to lock up, then want to effect a little better, it is recommended to use double-sided tooth lock washer, I can give you the price of understanding, Baidu my user name!
Q:What is the reason why the rubber washer is small after use?
The quality is not good or lubricating oil and rubber ring reaction
Q:In the design, the bolt connection is necessary to have a gasket?
Bolted components can not be avoided by extrusion, and a flat gasket reduces the wear of the surface of the component when tightening the bolts, especially those of the aluminum material. In parts when the bolt is tightened by extrusion deformation or broken, the torque control is improper. In the mobile phone production line, a lot of workers to install mobile phones, some people do not tighten tight, some people will break the crack parts, so the production line are used to play the role of measuring torque wrench.
Q:What is the difference between gaskets and seals?
Sealing ring is dedicated to seal, sealing effect is better.Gaskets are also included in the back pad, flat pad, spring pad, not necessarily a seal.
Q:How do you choose the appropriate gasket for bolt or screw connection?
When the bolt is connected, the target of the washer is to disperse the material which is connected with the material, reduce the damage to the surface of the material to be connected when the bolt or the nut is reduced, or prevent the loosening of the bolt. When you choose the gasket can be the actual need to relax the use of spring washers, to protect the surface of the material to be connected, optional plain washers. The principle of choice is that the inner diameter of the washer is slightly larger than the outer diameter of the bolt. Screw connection, the use of slightly larger than the location of the largest screw flat washers can be.
Q:Gasket A140 what is the material
A140 belongs to stainless steel, used for corrosive medium environment to do flat washer;
Q:Nominal diameter 12 washers, outside diameter?
flat washer is usually thin pieces, with different shapes are used to reduce friction, prevent leakage, isolation, to prevent loosening or dispersed pressure.Flat washer is mainly used to decrease the pressure, when some parts of the screw down the axial force is very big, easy to make the pressing dish washer, then can use material and improve the hardness to solve.
Q:Do not use self tapping screws
Flat washer is generally used in the connecting piece is a soft texture, a hard brittle, its main role is to increase the contact area, pressure distribution, to prevent the soft texture of the crush. The basic function of the spring of the spring washer is to tighten the nut after the nut to a force, increasing the friction between the nut and bolt! The material is 65Mn (spring steel), heat treatment hardness is HRC44 ~ 51HRC, through the surface oxidation treatment.
Q:What are the advantages and disadvantages of car audio modification, wood washer and plastic washer?
Wood washer: divided into three plywood and MDF, they are afraid of water. In particular, the density board, see water expansion, brush waterproof, on the line. Advantages: can make the desired shape, there is no resonance.Plastic gasket defects: fixed shape, difficult to modify, there will be a little resonance, the advantages of super waterproof.If the horn is mounted directly on the plate, it is easy to cause resonance. This resonance will seriously deteriorate the quality. When the speaker vibrates, it will drive the steel plate to vibrate. Therefore, the main purpose of the installation of wood pad is to reduce the resonance, the installation of speakers more solid.
Q:What material is used for spring washer
Spring cushion ring: widely used in the mechanical and bearing capacity of the general mechanical products, which is characterized by low cost, easy installation, suitable for frequent loading and unloading parts. But the spring washer is very loose! Especially in Europe and the United States in the current requirements of high reliability products, the use of very low rate, especially the important load-bearing structure of the connection site has been abandoned for many years. Our country has some applications in the military, but has been improved to stainless steel materials. It is said that the steel spring washer in CASC was banned! It is also said to be very unsafe, there are two reasons for the 1 is up ring is hydrogen embrittlement of 2.

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