Manhole Cover(Cover Only)with Good Quality

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Loading Port:
Tianjin
Payment Terms:
TT OR LC
Min Order Qty:
1500 m.t.
Supply Capability:
200000 m.t./month

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Item specifice:

Material: Ductile Iron Standard: square Power Supply: AC Power
Customized: Customized Surface Treatment: Zinc Plated

Product Description:

1.Ductile Iron Manhole Cover Description :
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.Designs: based on EN124 standard and according to customer's drawing or samples.
4.Color: black, Grey, green, blue and Marble , etc.
5.Inspection: in-house or the third party as per customer's request.

2.Main Features of the Ductile Iron Manhole Cover:
1. High load capacity & resilience
Hardness is same as cast iron, while FRP manhole covers have overwhelming advantages on resilience recovery. They are designed to exceed A15/B125/C250/D400 load capacity, according to EN124: 1994.
2. Designed structure & pressure dispersion
Arc-shaped bottom structure allows the pressure they bear disperse averagely on the whole surface. Besides, the products are made not by SMC, it was put in several layers of fiber cloth to enhance the structures. So they are stronger than SMC composite manhole covers.
3. 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.
4. 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.
5. Customer design
FRP manhole covers allow customers’ innovative design, logo, or etc. we have our own design team who can also offer design work for customers.
3.Manhole Cover Images:

Manhole Cover(Cover Only)with Good Quality

Manhole Cover(Cover Only)with Good Quality

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) Designs
A) EN124 Class B125 C250 D400 F 900, with different size and grammage, or as  customers' requirement.
B) as per customers' drawing or samples

4) Process
A) Molding boards
B) Hand Casting
5) Coating
A) black bitumen or epoxy .
B)Coating as per customer's requirement
5.FAQ:
We have organized several common questions for our clients,may help you sincerely:
Q. Can I fit a square manhole cover into a round chamber?
A. Yes, there are a select few manhole covers which are square-to-round, meaning they will fit square or round chambers.

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:Screw, nut, gasket connection order is how ah, elastic gasket and cushion under what circumstances should be placed on the
Washer look at the situation there is a large screw hole to prevent the screw directly into the hole on the installation of the screw to prevent the nut back on the nut installed on the other side of the file?
Q:Why do you have to add a spring washer when it comes to the role of ah ah ah
Reinforce and prevent looseningImagine the screw into the threaded hole, if the equipment for a long period of vibration, screw and screw combination may be loose, or even fall off
Q:Flat gasket with what material
Due to the standard for the 100HV, 140HV flat washers can be made of low carbon steel. General enterprises in the selection of materials, most of the materials used in Baosteel, easy to cold stamping. Here is a brief description of Baosteel standards.
Q:Nominal diameter 12 washers, outside diameter?
due to the material and craft limits to threaded fasteners, bolts and other fasteners supporting surface is not big, therefore to reduce the pressure on the surface compressive stress protection by fitting of surface, it adopts the washer.In order to prevent the loose connection vice with locking spring washer and more tooth lock washer, round nut and lock washer with saddle, waveform, conical spring washer.
Q:In the design, the bolt connection is necessary to have a gasket?
The bolt must not install gasket, join many planes and automobiles and ships, wind turbines, atomic energy equipment is not installed gasket, everywhere is whether heavy vehicles or small bolts on the wheel without gasket. Gasket is the name of the washer, flat washers, special washers, spring washers, washers, washers. Installed not installed gasket, what gasket, depending on the specific design requirements, to have the basis of choice. In general, the position of the bolt hole is very high, the bolt hole diameter is relatively small, with close to that level of reaming hole, install flat washer is unnecessary, it does not have the nut friction. For those with very rough hole bolt connection, such as with M12 bolt hole diameter of 16mm, 18mm, it should be installed flat washer. This connection is often a lap of the steel frame, the location of poor manual drilling equipment. The automobile gear box is usually a hole on the production line and the position of the hole is high, and the bolt hole with the gap is relatively small, do not install the washer, otherwise the smaller contact area of the nut, the bolt is easy to loose.
Q:Gasket A140 what is the material
A140 belongs to stainless steel, used for corrosive medium environment to do flat washer;
Q:Specific conditions for use of spring washers
Hello!National standard for spring washers:Standard spring washer (GB93-1987)Light spring washer (GB859-1987)Heavy duty spring washer (GB7244-1987)
Q:What is the reason why the rubber washer is small after use?
Rubber elastic loss (compression permanent deformation large), the rubber will lose the value of the work. If the dynamic load is the damping effect is poor!!! The specific design of rubber products can contact, contact Baidu private message!!
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:Gasket 300HV relative to what material?
For the 200HV and 300HV level should choose 45, 50, 60, 70 steel or 65Mn steel, heat treatment can be quenched and tempered to reach the technical requirements of 200 ~ 300HV and 300 ~ 400HV

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