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Frames, Grates & Inlets.
For utilities, engineers, contractors and distributors matching the local inlet and grate standard.
✓ Inlet, pipe and trench grates ✓ Price sheets for five U.S. regions
✓ Non-traffic to heavy-duty loads
On the heavy castings sheets
- Square inlets and ditch grates
- Round pipe and ditch grates
- Curb inlets
- Trench grating
- Cleanouts and lampholes
Sections vary by region. Check yours in the table below.
What to send your regional team
- The standard detail or drawing
- The size and the style of the opening
- The load application
- The quantity and the job location
Made to the local standard.
Inlet frames and grates follow the city or utility standard, from the pattern to the style of the opening. That is why SIGMA's heavy castings price sheets go by region, and why SIGMA takes custom orders made to your specification.
Frames and grates come as sets, or as grates and frames on their own, and extensions are listed too. Some sheets also list reversible, hinged and bike-proof grates.
Two ways to order.
Each region's heavy castings price sheet lists its inlets and grates. The sheets are all dated March 15, 2024. Not sure which region covers the job? Find your regional team.
Know the item number?
Find it on your region's heavy castings price sheet, then order through your waterworks distributor.
Have a spec or a drawing?
Send the standard detail or drawing to your regional team. They match it to a sheet item or quote it as a custom casting.
| Region | Regional team | Heavy castings price sheet |
|---|---|---|
|
Northeast |
Cream Ridge, NJ |
|
|
Midwest |
Sauk Village, IL |
|
|
Southeast |
Alexander City, AL |
|
|
Southwest |
Houston, TX |
|
|
Western |
Ontario, CA · Auburn, WA |
Every casting carries its heat number.
The heat number traces a casting to the foundry, the date and the production batch. SIGMA has inspection procedures for each castings product line, at the foundry and again at SIGMA.
5 quality steps
Inspection procedures for each castings product line, SIGMA engineers or inspectors at the foundries, material test reports, incoming inspection at SIGMA and statistical process control.
ASTM and AASHTO
Standards SIGMA works to, with federal and state department specifications, Canada's BNQ standard and the customer's own requirements.
PE certification
By an outside professional engineer, on request.
From SIGMA's November 2024 article on municipal castings.
Questions about frames, grates and inlets.
Short answers. Your regional team has the rest.
The frame is set into the structure and holds the grate; the grate lets the water in. The inlet is the opening itself, such as a square inlet or a curb inlet. SIGMA's price sheets list frames and grates as sets, and grates or frames on their own.
The one your spec calls for: the size, the style of the opening (slotted, square holes, beehive or flat) and the load application. Many sheet items follow a city's or utility's own pattern, so start with your region's sheet, or send the standard detail to your regional team. Send any other project requirements with it.
Some regional sheets list grates labeled ADA, and bike-proof grates. Check the sheet for your region, and confirm with your regional team that the item meets your spec.
SIGMA castings are made for applications such as non-traffic, light, medium and heavy-duty loads. SIGMA works to ASTM and AASHTO standards, federal and state department specifications, Canada's BNQ standard and the customer's own requirements, and can have castings certified by an outside professional engineer on request. Confirm the rating your spec calls for with your regional team.
Yes, as a custom order made to your specification. Send the drawing or standard detail for the frame and grate to your regional team. A new casting goes through a drawing, a sample and an approval step before production.
SIGMA sells through waterworks distributors, so your price comes from your distributor. Ask your distributor or your regional team about pricing.
Have the spec in hand?
Your regional team can match it to the right frame and grate.
Headquarters, Cream Ridge, NJ