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Classification of ductile iron manhole covers
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Classification of ductile iron manhole covers

Views: 2     Author: Site Editor     Publish Time: 2021-04-27      Origin: Site

There are many types of manhole covers, single-layer, double-layer, cast iron manhole covers, ductile iron manhole covers, composite manhole covers, cement concrete manhole covers, etc. Among them, ductile iron manhole covers are the most widely used. According to the En124 standard, manhole covers are divided into six grades according to the load-bearing capacity :

Group 1 (A15)— areas where only pedestrians have access. Covers and gratings capable of withstanding a 15kN test load.

Group 2(B125)—car parks and pedestrian areas where only occasional vehicular access is likely (incl. driveways). Covers and gratings capable of withstanding a 125kN test load.

Group 3 (C250)— car parks, forecourts, industrial sites and areas with slow moving traffic. Also in highway locations up to 500mm from the kerb and up to 200mm into the verge, excluding motorways. Covers and gratings capable of withstanding a 250kN test load.

Group 4 (D400)— areas where cars and lorries have access, including carriageways, hard shoulders and pedestrian areas. Covers and gratings capable of withstanding a 400kN test load.

Group 5(E600) — areas where high wheel loads are imposed, such as loading areas, docks or aircraft pavements. Covers and gratings capable of withstanding a 600kN test load.

Group 6(F900) — areas where particularly high wheel loads are imposed such as aircraft pavements. Covers and gratings capable of withstanding a 900kN test load.


· EN 124 Standard


GROUP

CLASS

LOAD STRENGTH

SCOPE

INSTALLATION AREAS

EXAMPLE

1

A15

1,5Ton (15kN)

Light Duty

 Areas which can only be used by pedestian and pedal cyclists.

Bicyle ways, pedestrian ways

2

B125

12,5Ton (125kN)

Medium Light Duty

Footways, pedestrian areas and areas with light duty.

Parking areas only for cars

3

C250

25 Ton (250kN)

Medium Duty

 Kerbside channels of roads which when measured from the kerb edge extend a maximum of 0.5m into the carriegeway and a maximum of 2.0m into the footway.

Kerbside parking areas

4

D400

40 Ton (400kN)

Vehicular Traffic

  Carriageway of roads(including pedesterian ways)hard shoulders and parking areas for all types of road vehicles

Motorways and vehicle traffic

5

E600

60 Ton (600kN)

Private Areas

 Areas imposing high wheel loads.

Roadways and vehicle traffic

6

F900

90 Ton (900kN)

 Private Areas

Areas imposing high whell loads..

Aircraft pavements


06

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