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:Would like to know the role of flat washer?
In simple terms, the fastener medium has mainly above the washer, sealing, decompression, increase friction damping, fixed five role.
Q:how to Flat washer installation
Spring washer loose effect is better. Note that the spring washer is a one-time, used to remove it and then do not re-use. Because the spring washer depends on the edge of the cutting edge of the nut to cut the nut to prevent the reverse movement, until the role of anti loose. Nut spring washer on the once tight, then loosen the spring washer, the oblique opening edge will reverse the cutting edge of the nut, will become blunt, often in the proposed vibration occasions additional port pin.
Q:how to use Motor washer
Spring washer loose, as well as sealing gasket, corrugated gasket clearance
Q:how much Specification for washers
Stop washer is used in conjunction with nut to prevent loosening of the nut washer. General is divided into round nut with a stop washer, the outer tongue stop washer, ear stop washer, single ear stop washer, etc..
Q:I would like to ask what is the standard gasket and gasket in general what material?
Less dosage, the metal with Q235, rubber with XB200, are very common. If the amount is large, according to the situation to choose the most economical
Q:What material is used for spring washer
Usually 65MN spring steel or 70# carbon steel, but sometimes also with 60Si2Mn, can also be used stainless steel material SUS304 or SUS316
Q:Nominal diameter 12 washers, outside diameter?
According to GB/T 95-2002 - C level standard flat washer, nominal diameter (large thread diameter) 12 flat washer, its outer diameter (Max) = 24 mm;(min) = 22.7 mm.
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 is the reason why the rubber washer is small after use?
The quality is not good or lubricating oil and rubber ring reaction
Q:When do flat washers use GB95 when using GB97.1?
See tolerance, high requirements with GB97.1. if in order to save money, and the application environment is not high, use GB95.

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