Unicast India


Technical Specification


Our Products are compliant to the requirements of various specifications mainly BS-497/76, BS-EN-124, DIN, ASTM. UNICAST INDIA is BSI registered an ISO 9001: 2000 certified company. Besides this, Company has been consistently given feedback by its ever satisfied customers. The approval certificates can be made available to our customers on request.



BS-497-76

Manhole Covers & Frames

Grade

Description

Grade

Description

A

Manhole Covers and fames for use in carriageways carrying vehicles with wheel loads of up to 11.5 tones. For use in carriageways carring fast-moving vehicle, such as motorways, trunk roads and other primary routes.

B1

Manhole Covers and fames capable of carrying wheel loads of up to 5 tones, for use in carriageways carrying relatively vehicles, minor residential road.

B2

Sealed Manhole covers and frames capable of bearing wheel loads of up 5 tones. For use in area which vehicles would only have occasional access such as pedestrain precincts.

C

Seaked inspection covers and frames for use in area inaccessible to motor vehicles.

D

Manhole covers and frames capable of bearing wheel loads of up to 11.5 tones. For use in carriageway carrying fast-moving vehicles, such as motorways, trunk roads and other primary routes.

 

Road Gully Gratings & Frames

Grade

Description

Grade

Description

A1

Gully Gratings and frames capable of bearing wheel loads of up to 11.5 tones, for use in carriageways.

A2

Hinged gully gratings and frames capable of bearing wheel loads of up to 11.5 tones, for use in carriageways.

B

Hinged gully gratings and frame capable of bearing wheel loads of up to 5 tones, for use in carriageways carrying relatively slow-moving normal commercial vehicle.

 


IS 1726 : 1991

Grade

Description

Test Load

LD 2.5

Rectangular / Square / Circular

2.5 Tones

MD 10

Circular / Rectangular

10 Tones

HD 20

Circular / Lamphole Cover / Square / Rectangular (Scrapper Manhole)

20 Tones

EHD35

Circular / Square / Rectangular (Scrapper Manhole)

35 Tones


BS EN-124

  • Group – 6 F 900 Areas impassing particularly highy loads, e.g. Aircraft pavements. 90 tons test load.
  • Group -  5 E 600 Areas impasing high wheel loads such as docks and aircrafts pavements. 60 tons test load.
  • Group -4 D 400 For use in carriageways  of road (including pedestrains streets) hard shoulderrs and parking area of all types. 40 tone test load.
  • Group – 3 C 250 Gully taps installed in the area of kerb side channels of roab which when measured from the kerb extend a maximum of 0.5 meters into the carriageway and a maximum of 0.2 meters into the pavement 25 tons test load.
  • Group – 2 B 125 Footways, pedestrains areas and comparable areas , car parks or car parking decks. 12.5 tons test load.
  • Group – 1 A 15 Areas which only be accessed by pedestrains and pedals cyclists. 1.5 tons test load.

Grey Inron Comparison

Index Country Grey Iron Grade
1 Chine ---- HT350 HT300 HT250 HT200 HT150 HT100
2 Japanese ---- FC350 FC300 FC250 FC200 FC150 FC100
3 USA No.60 No.55 No.45 No.35/No.45 No.30 No.25 No.20
4 Russia C44u40 Cu35 Cu30 Cu24/Cu25 Cu18/Cu20/Cu21 Cu15 Cu10
5 Germany GG40 GG35 GG350 GG25 GG20 GG15 GG10
6 Italy --- G35 G30 G25 G20 G15 G10
7 France FGL400 FGL350 FGL300 FGL250 FGL200 FGL150 ---
8 England 400 350 300 260 180/220 150 100
9 Poland Z140 Z135 Z130 Z125 Z120 Z115 ---
10 India FG400 FG350 FG300 FG260 FG200 FG150 ---
11 Romania FC400 FC350 FC300 FC250 FC200 FC150 ---
12 Spanish --- FG35 FG30 FG25 FG20 FG15 ---
13 Belgium FGG40 FGG35 FGG30 FGG25 FGG20 FGG15 FGG10
14 Australia T400 T350 T300 T260 T220 T150 ---
15 Sweden 0140 0135 0130 0125 0120 0115 0110
16 Hungary 0V40 0V35 0V30 0V25 0V20 0V15 ---
17 Bulgaria --- Vch35 Vch30 Vch25 Vch20 Vch15 ---
18 ISO --- 350 300 250 200 150 100
19 Copant FG400 FG350 FG300 FG250 FG200 FG150 FG100
20 Taiwan (China) --- --- FC300 FC250 FC200 FC150 FC100
21 Holand --- GG35 GG30 GG25 GG20 GG15 ---
22 Luxemburg FGG40 FGG35 FGG30 FGG25 FGG20 GG15 ---
23 Austria --- GG35 GG30 GG25 GG20 GG15 ---
24 Europa-Norm --- ENGJL-350 EN-GJL-300 EN-GJL-250 EN-GJL-250 EN-GJL-200 EN-GJL-150

 

Notes : Please follow Grey Iron Comparision Table to find out U.T.S. And/or BHN of any other grades worldwide.


Load Test Requirements

-- Stipulated test load in kN for quality contronl Size of test blocks in mm
Product garde (loading) Grey Iron Manhole Covers Kerbs and Gratings
BS 497 – 1976
A76 350 300 dia 300 x 235
B76 150 300 dia 300 x 235
C76 10 300 dia 300 x 235
D76 400 250 dia 300 x 235
Germin Din 1229 & 1213
Din 'fF' 900 250 dia 220 x 150
Din 'E' 600 250 dia 220 x 150
Din 'D' 400 250 dia 220 x 150
Din 'B' 150 250 dia 220 x 150
EN 124
F900 900 250Ø 250Ø
E600 600 250Ø 250Ø
D400 400 250Ø 250Ø
C250 250 250Ø 250Ø
B125 125 250Ø 250Ø
A15 15 250Ø 250Ø
ASTM A48
Class 30, Class 35, Heavy Duty 25,000 lbs 9" x 9" Square block --
Cllass 30/35, medium duty 4,000 lbs 9" x 9" Square block --

Instrument Castings

The Unit also produce many Instruments Castings such as Flange Clamps and Aligning Rings for Ash slurry line, Jute machinery parts like Gabbles, Bearer. The Instrument Castings are mainly in Grade casting and in Composition castings. In case of Grade Castings the Results are given below.

 

Mechanical Test Requirements :

Grade U.T.S Min Mpa (N/mm2) Hardness (BHN)
FG 150 150 130 to 180
FG 200 200 160 to 220
FG 220 220 180 to 220
FG 260 260 180 to 230
FG 300 300 180 to 230
FG 350 350 207 to 241
FG 400 400 207 to 270
ASTM A-159 ,G 3000 3000Psi Min 187 - 241
ASTM A-159 ,G 4000 3000Psi Min 217 - 269

Key Features of Manholes

  • Double Triangular : Cover comprising two triangular element for the purpose of providing stable under load and convience of lighter weight due to split covers.
  • Single Triangular : As above but comprising one triangular element.
  • Single Seal : Veretical relationship between a cover edge and frame with covere bottem sitting in the seal as shown in sketch.
  • Plain Seated : Non sealed , but jointed contact between a cover edge and frame.
  • Clear Opening : The noiminal un unabstructed access opening in a frame, neglecting minor intrusion such as the corner fillets of some rectangular frames.
  • Watertight : Proof against the passage of surface water of minimal depth and at atmosphere pressures.
  • Pressure Tight : Proof against the escape of fluids / gasses at within specified pressures.
  • Recessed cover : Cover recessed to allow the insertion of chosen material usally to match the suuounding area.
  • Ventilated : Cover and / or frame provided with opening to allow free circulation of air within the shaft.
  • Slide Out : Cover removable by sliding action rather than vertical lift.
  • Safety Grid : A tabricated steel grid housed under a cover when installed to hold an accidentally dropped cover.
  • Grid Plate : Glass reinforced plastic plate usually located under a cover to provide additional protection against the ingress of sound/ aitt etc. Or the escape of odours.
  • Chambered Keyholes : Lifting keyholes encapsulated to reduce the ingress of sand / silt etc. And the escape of odours.
  • Prising Slot : Recess to receives a prising bar for the purpose loosening a cover prior to lifting.
  • Holding Down Bolts : Provision as made in the frame of certain units for the insertion of bolts for positive fixing to the bed.
  • Loosely Coupled : The two half elements of doublr triangular cover are loosely coupled to prevent element being dropped into the shaft during lifting.
  • Seating : The bearing surfaces between a cover and frame.