Ansi/NAAMM ( MGB 531-88 )welding steel grating

Specifications

welded (plain or serrated) or pressure locked grating
welded bar width:3/4' -2-1/2"
welded bar thickness:1/8', 3/16'

 STANDARD OF GRATING

 

	Standard for steel grid	Steel material	Hot-dip-galvanization
China	YB/T4001-1998	GB700-88	GB/T13912-92
USA	ANSI/NAAMM(MBG531-88)	ASTM(A36)	ASTM(A123)
UK	BS4592-1987	BS4360(43A)	BS729
Australia	AS1657-1985	AS3679	AS1650

SIZE OF BEARINGBARS 

 The size of bearing bars is expressed in mm of depth and thickness as follows

20*3   32*3

20*5   32*5

25*3   40*3

25*5   40*5

30*3   50*3

30*5   50*5     

 

Type of loading bar surface

 

 

Plain Type	Serrated Type
Plain grating is the standard type.	With a sound anti-skid property serrated grating is normally used on greasy off-shore platform and equipment operating station ,etc.

MATERIAL 

Carbon steel , Stainless

 

FINISH: mill finish, paint, galvanized as specified

APPLICATION
Steel grating is widely used in the platform, corridor, bridge, well covers, stairs, fencing for petroleum, universally used in most general industrial plants as well as commercial buildings, it has wide applications as walkways, platforms, safety barriers, drainage covers and ventilation grateschemical, power plant, waste treatment plant, civil engineering projects and environmental projects.

is the most popular of all grating types due to it's strength, cost efficient production and ease of installation.

CONSTRUCTION DRAWING AND SPECIFICATIONS 

 
The buyer shall be expected to furnish to the supplier a set of construction drawings and specifications of current insure showing the layout of supports and floor openings correctly dimensions, together with the size and types of grating and treads desired. Should cutouts for vertical bracing or moment connections be required for shop fabrications, the structural steel detail drawings shall be furnished prior to the preparation of the grating drawings

 

If construction drawings and specifications are not available, the buyer shall provide complete information regarding all items listed in “to be provided".

 

Order Guide of Grating

1. Indicate material of grating, size of load bar and the surface treatment method.
2. Select suitable type of grating according to load table
3. Indicate requirements of banding and cut-put position.
4. Offer the size, quantity and direction (span direction, normally written at the back, followed with "LB ").
5. Where any large area of grating application is required, please provide the following information in the drawing for the purpose of layout design:
    All dimensions.
    Load bar direction, location and section size of support steel direction.
    Location and size of movable area and cut-out.
    Location and size of' kick plate, front nosing and splicing.
6. The grating is generally priced by square meter according to area calculation standard of' YB/T4001.1-2007, i.e.max size of' exterior, including holes and cut-out. ect. 
7.  Reasonable alignment of grating.
   For example: When using G325/30/100-G grating on a 4700x1500mm platform, generally the design of load bar will be based on the short span(1500mm), moreover, some clearance should be left between gratings for installation.

ln accordance with YB/T4001.1-2007 standard, the area of grating is calculated as follows: S=W x L