STEEL GRATING

• Steel Grating is a kind of open steel member with is bearing bars & cross bar jointing at their intersections either by welding or locking. We can provide anything for grating such as : untreated and hot dip galvanized.

General Usage of Grating :

• Flooring

• Catwalk

• Mezannines / Decking

• Stair Treads

• Vault Bin Floor

• Trench Cover

• Window and Machinery Safe Guards

• Storage Rack

• Drainage Pit Cover and So Forth

Field of Application :

• Power Plant

• Oil & Gas

• Cement Industries

• Construction Material Industry

• Light Chemical Industry

• Petro - Chemistry

• Machinery Industry

• Airport Industry

• Agriculture

• Aquatic Breeding

• Fertilizer Industry

• Parking Lot

• Marine Engineering

• Sewage Disposal

• Transportation Industry

• Otomotif Industry

• Etc.

> Definition of Steel Grating

Steel Grating is a king of open steel member with its bearing bars & cross bars jointing at their intersections either by welding or by locking

> General Information of Steel Grating

Bearing Bar : A flat bar with standing the main load is in consistent with the span direction.

Cross Bar : The connecting bars, made from twisted bar, round bar or flat bar, which extend across the bearing bars and the bars used to secure the position of the bearing bars.

Bearing Bar Pitch : The distance center to center of the two adjacent bearing bars.

Cross Bar Pitch : The distance center to center of the two adjacent cross bars.

Length : The maximum dimension of a grating panel, measured parallel to the bearing bars & in the same direction as the bearing bars.

Width : Measured perpendiculsr to the bearing bars & in the same direction as the cross bars. The overall dimension height of a grating panel.

Height of Bearing Bar : The dimension thickness of a grating panel.

Thickness of Bearing Bar : The dimension thickness of a grating panel.

Banding Bar : A flat bar used for end plate of a grating panel and to enhance architectural appearance or to provide additional transverse stiffness

> Material Standards

Mild Steel - Makmur Jayamandiri Steel utilize a high quality mild steel for load bearing bars, which exceeds the strength of ASTM A36, JIS G3101, SS400. This is particularly beneficial where a floor is subjected to wheel loads, as deflection becomes a subornate consideration to the ability of the load bearing bar to with stand high stress.

> Manufacturing Standars

Makmur Jayamandiri Steel grating are designed and manufactured in accordance with relevant international standads, Makmur Jayamandiri Steel utilize manufacturing standard of the National Association of Achitectural Metal Manufacturers (NAAMM) and Singapore Standard SS-363-1993.

> Treatment Standards

Galvanized Hot-Dip galvanizing conforms to the following equivalent Standards: ASTM A123.

> Tolerance of Steel Grating

1. The allowed deviation of length and width is +/- 6mm

2. The non-perpendecularity of bearing bar is allowed no more than 10% of width of bearing bar.

3. Position deviation of cross bar: cross bar surface should not surpass bearing bar surface 1 mm, beginning & end of cross bar should not surpass the end surfaces of two sides of grating 2 mm.

4. The deviation of diagonal caused by grating tolerance should be equal or less than +/- 6mm.

> General Recomended of installation Steel Grating

1. Grating must be installed with cross rods on top side to achieve strength specifications provided.

2. Metal should be used for all grating supports.

3. Clearances shown are recommended but may vary in accordance with dimensional tolerances.

4. Heavy Duty Grating must be designed to have structural support under each bearing bar at cut outs.

> Example

1. GRT 25/5 - 30/100 GS

2. GRT 25/5 - 30/100 GP

> Designation

Each Grating type is coded for easy identification as shown in the following example :
GRT : Sign of MJS Grating

25/5 : Size of Bearing Bar (Height x Thickness)

30 : Bearing Bar Pitch

100 : Cross Bar Pitch

G/U : Sign of Treatment Material (Galvanized or Untreated)

P/S : Sign of the Shape of Bearing Bar (Plain or Serrated)