GRATINGS, TERMINOLOGY
We have compiled a list of the terms we use when we name gratings.
Gratings
Gratings are manufactured in many different versions for the most varied of applications. We have compiled explanation for the various technical terms that are usually used when we name gratings and their component parts.
Grating, Pressure Welded
Weland pressure welded grating is manufactured according to the resistance welding method. The load bearing bars are joined with the cross bars under high pressure and high amperage. This manufacturing method for pressure welded grating gives a welded joint at each connection between load bearing and cross bars. This provides the grating with extremely good durability, strength, and a high bearing capacity. Edging bars are welded perpendicularly to the bearing bars on the grating. Grating is made either from hot dip galvanised steel or stainless steel.
Grating, Type A
Type A type grating consists of flat steel bars that are cut into lengths for both the load bearing bars and the cross bars. The punched out load bearing bars are laid together with the cross bars to produce a mesh pattern, and the grating is supplied with edging bars on two sides. The grating is manufactured in steel, stainless steel or aluminium. We have a large range of entrance gratings, manufactured from Type A grating.
Load bearing bar
Upright positioned load bearing bars/flat bars. The load bearing bar constitutes the load bearing structure in the grating.
Cross bar
Bars that connect the load bearing bars at right angles.
Cross bars in pressure welded grating consist of a round bar.
Cross bars in Type A grating are manufactured from flat bar.
Serrated version
In the serrated version, it is normally the load bearing bar that is manufactured in serrated version.
Grating length or load bearing bar dimensions
Grating length = the load bearing bar length
The load bearing bar’s length is indicated on the drawing. In the dimension specification, the load bearing bar size is given first, e.g. 810 x 1000 mm.
Grating width (cross bar dimensions)
Grating width = the cross bar length
In the dimension specification, the load bearing bar size is given first, e.g. 810 x 1000 mm.
Grating height
Grating height = the load bearing height
Coincident cross bars
The grating can be manufactured with coincident cross bars. Delivered for an additional charge.
High edge bar (kick strip)
Edge bar that is higher than the load bearing bars and with the projecting section above the grating.
Deep edge bar
Edge bar that is higher than the load bearing bars and with the projecting section below the grating.
Hole dimensions
The “rigid” dimensions of the opening in which the grating will lie.
Freespan
The open space the grating has to cover. (The distance between the supports’ inner edges)
Can also be described as the free span width.
Adapter section
The grating’s standard width is 1000 mm. To obtain the complete layout dimension, an adapter section is frequently needed. The adapter section is cut at the closest load bearing bar.
Recess
A collective term for all types of cutting and fitting. See below.
Straight cutting
Cutting at right-angles to the load bearing and cross bars.
Figure cutting
Cutting that is not at right-angles to the load bearing and cross bars.
Gross area
Pressure welded grating: The area that is obtained when the area is calculated based on our standard widths 500 and 1000 mm.
Grating, Type A: The grating’s dimension are reckoned up to the nearest ten centimetres.
Net area
The grating’s net area including any recess.centimetres.
