1. Grades of grey iron Manhole covers, Inspection covers and Gully gratings and frames. 
(a) Grade A: Manhole covers and Gully covers gratings, capable of bearing wheel loads up to 11.50 tonnes for use in Carriageways. 
(b) Grade B: Manhole covers and Gully gratings, capable of bearing wheel loads up to 5.00 tonnes for use in Carriageways carrying relatively slow-moving normal commercial vehicles. 
(c) Grade C: Sealed Inspection covers and frames for use in situations inaccessible to motor vehicles. 
 
2. Kerb-type gully covers and frames are for use in kerbs of carriageways. Weir depth (distance from top of cover to top of fixed weir, if any) shall be either 115mm or 165mm at customer's selection.
 
3. Test Loads: Grey Iron units - BS: 497: Part 1: 1976  

BS: 497: 1976 
Manhole and Inspection 
Covers and Frames
Road Gully Gratings  
and Frames
Kerb Type Gully Covers 
and Frames
Grade
Test Load
Dia of  
Test Block
Grade
Test Load
Size of  
Test Block
Test Load
Size of  
Test Block
 
kn
mm
 
kn
mm
kn
mm
A
350
300
A
350
350 X 235
150
300 X 235
B
150
300
B
150
350 X 235
 
 
C
10
300
 
 
 
 
 
 
 
4. Test Certificates: 
If requested, customers will be furnished with a certificate covering each delivery, stating that the designs covered in the supply comply with the loading applicable on random tests carried out. 
 
5. Sizes: 
Sizes are generally nominal indicated by clear opening in the frames & all dimensions are approximate. 
 
6.  Weights: 
Weights mentioned in the Catalogue are just approximate for guidance of the customers. 
 
7. Interchangeability: 
Covers or grades of any given design and size will interchangeable with their respective frames. 
 
8. Protective Coating: 
All products are coated with black bituminous or asphaltic paint, unless otherwise specified. 
 
9. Technological Developments: 
As we are adopting latest technological & scientific method, changes, if any, in specifications, due to development will not be binding on us.