Grating Pacific

rating Pacific offers two distinct types of Pressure Locked Gratings which are identified by their method of assembly. Manufactured without the introduction of heat or riveting, these gratings provide a finished product with attractive architectural lines. This pleasing appearance makes Pressured Locked Gratings ideal candidates for architectural and ornamental applications such as grilles, screens and fences. Additionally, pressure locked methods of manufacturing allow for the production of close mesh gratings with minimal open area. Pressure Locked Gratings with bearing bars spaced at 11/16" and 7/16" on center conform with the rigid spacing requirements of the Americans with Disabilities Act (ADA). These products are commonly installed at the entrance to public buildings where concerns of pedestrian traffic and high heeled shoes coincide with needs for ventilation and drainage.

SWAGED PRESSURE LOCKED GRATINGS
Pressure Locked Gratings manufactured by swaging are designated by the profile "PS." These products are assembled by inserting hollow tube cross bars into pre-punched holes in the bearing bars and then swaging the cross bars (similar to the aluminum gratings). This permanently locks the entire cross bar/bearing bar intersection within the interior of the bearing bar.

ISOMETRIC SWAGED INTERSECTION	CLOSE MESH TYPE PS-7-4


DOVETAIL PRESSURE LOCKED GRATINGS
Pressure Locked Gratings manufactured with deep rectangular cross bars are identified as dovetail pressure locked and are designated by the profile "PD." These products are assembled by pre-punching both the bearing bars and cross bars, aligning the bars in an *egg-crate* manner, and deforming the cross bar into the dovetail slot in the bearing bar under intense hydraulic pressure.

		MATERIALS Commonly produced in ASTM A-569 mild carbon steel, 6000 series stainless steels, Pressure Locked Gratings can also be manufactured in select specialty alloys. For assistance in selecting appropriate specialty alloys, please contact our sales department.

FABRICATION
All Grating Pacific Pressure Locked Gratings are fabricated to size on a "per order" basis. To enhance longevity, all products are manufactured with each outside cross bar/bearing bar intersection fillet welded in accordance with NAAMM standards. Banding provides additional transverse stiffness and it is highly recommended that all Pressure Locked Gratings be specified with all cutouts and open ends banded (see banding definition).

TABLE OF SPACINGS AVAILABLE

STANDARD
MESH
GRATING

TYPE 19-4

Bearing Bars at 1-3/16" O.C.
Cross Bars at 4" O.C.

ADA
CONFORMING
SPACINGS

TYPE 11-4

Bearing Bars at 11/16" O.C.
Cross Bars at 4" O.C.

OTHER BAR
SPACINGS
AVAILABLE

TYPE 19-2

Bearing Bars at 1-3/16" O.C.
Cross Bars at 2" O.C.

TYPE 11-2

Bearing Bars at 11/16" O.C.
Cross Bars at 2" O.C.

TYPE 15-4

Bearing Bars at 15/16" O.C.
Cross Bars at 4" O.C.

TYPE 7-4

Bearing Bars at 7/16" O.C.
Cross Bars at 4" O.C.

TYPE 15-2

Bearing Bars at 15/16" O.C.
Cross Bars at 2" O.C.

TYPE 7-2

Bearing Bars at 7/16" O.C.
Cross Bars at 2" O.C.

CUSTOM BEARING BAR SPACINGS

The Dovetail Pressure Locked method of manufacturing is particularly flexible in that it allows for the production of gratings with custom bearing bar spacings. Small quantities can easily be manufactured to suit the precise needs of most applications. To specify non-standard spacings, simply insert the desired bearing bar center to center spacing (in sixteenths of one inch) in lieu of the standard spacings shown in the table above (note that 4" and 2" cross bars centers should be maintained).

EXAMPLE: PD-8-4 FOR GRATING WITH BEARING BARS AT 1/2" ON CENTER

BEARING BAR SELECTION & LOAD TABLES

The bearing bar sizes offered for pressure locked gratings are common to those in welded steel, swaged aluminum and stainless steel gratings. In that the sizes and spacings of the bearing bars are consistent with these products, the load tables are similarly interchangeable. Load table for pressure locked gratings can be found on the following pages:

PRESSURE LOCKED STEEL GRATING
PRESSURE LOCKED ALUMINUM GRATING
PRESSURE LOCKED STAINLESS GRATING

HOW TO SPECIFY PRESSURE LOCKED GRATING

Proper specification of Pressure Locked Grating includes three components; profile, bar spacings and bearing bar size. Profile options are "PS" for swaged construction or "PD" for dovetail construction. Options for bar spacings are listed or can be custom specified. The desired bearing bar sizes shall be determined by consulting the appropriate load table. For clarity, the type of material (steel, aluminum or stainless) and finish should be specified.

EXAMPLE:PS-19-4" X 3/16" GALVANIZED STEEL

SAMPLE SPECIFICATION:

Pressure Locked Grating shall be as manufactured by Grating Pacific, 3651 Sausalito Street, Los Alamitos, CA 90720, (800) 321-4314. Grating shall be SWAGED construction, type PS-7-4 WITH 1" X 3/16" bearing bars spaced at 7/16 inches on center and SWAGED cross bars spaced at 4 inches on center. Material shall be A-569 STEEL with a GALVANIZED finish. All the cutouts and open ends shall be banded in accordance with NAAMM standards.



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Pressure Locked Grating
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Swaged Aluminum Gratings	Stainless Steel Gratings