FAST. FLUSH. TOUGH.
FJ Turner Co. risers help crews make light work of heavy metal. Choose the one that’s all grit, no grind.
OUR COMPOSITE MANHOLE RISER
Lightweight at 6 – 7 lbs
No noise
Corrosion resistant
Stackable
Wide variety of sizes
Local delivery
Made in the USA
Meets federal load requirement
Foreign cast iron risers
Heavy at 35+ lbs
Vulnerable to rust
Can cause metal “clatter”
Cannot be stacked
Limited sizing options
3 – 4 month lead time
Vulnerable to salts, water, oils
Not rated for 50,000 lb loads
WHY OUR RISERS?
Turner manhole riser rings solve a major challenge for today’s street maintenance crews: raising manhole castings to grade quickly, affordably, and permanently. Conventional brick-and-mortar methods are expensive and time-consuming. Cast-iron and steel extension rings are prone to shattering, shearing, and popping out of asphalt. Turner rings deliver the strengths of both approaches without the drawbacks. Our risers install in under a minute, cut down on crew hours, and eliminate complaints caused by loose, rattling lids.
Each Turner ring is engineered for precision and durability. Our composite rings are injection-molded to produce a precise, durable product that fits the exact dimensions of the casting. The result is a riser ring so dense and perfectly fitted that it forms a permanent seal capable of withstanding harsh road conditions without cracking. Turner rings can be installed before or after asphalt overlay, helping crews reduce costs, cut manpower requirements, and save tens of thousands of dollars annually.
View our riser schematics below.
INSTALLATION
Our riser rings are built for supremely easy and efficient installation. To learn more about the simple installation process or to see instructions, click below for a more in-depth look.
TEST RESULTS
FJ Turner Co. manhole riser rings are thoroughly tested to ensure durability and strength for road and utility scenarios. See our test results below.
We ran a proof load test on “MHEXT 24150PE – 24” x 1-1/2” composite manhole riser. The procedure included an FJ Turner Co. riser placed over a manhole frame and covered with a common manhole cover. The full assembly was placed on a calibrated 0-100,000 pounds DK No. I Universal Testing Machine and a concentrated load was applied at center using a 1/4-inch thick reinforced rubber pad (shore hardness “A” 80) on which a 1-inch thick 9-inch by 9-inch square steel plate was placed.
Ten percent of the load required was applied @ 5,000 lbs for one minute. The load was applied to the assembly at a rate of 50,000 pounds per minute. Once attained, the 50,000 pound proof load was applied for one minute.
CREDENTIALS
Click to see letters of recommendation from several state governments.
| Test Number | Material Identification | Diameter (in) | Load Weight (lbs) | Deflection at Load Inches | Permanent Set (No Load) |
|---|---|---|---|---|---|
| 1 | NY 1.5 Turner Co, Raleigh NC (Liner) | 24” | 50,000 | .095” | .037” |
| 2 | NY 1.5 Turner Co, Raleigh NC (Liner) | 24” | 50,000 | .095” | .035” |
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product data sheet – fpp3a15cc
| Property | Average Value | Test Method |
|---|---|---|
| Melt Flow, g/10 min (230° C/2.16kg) | 3 | ASTM-D1238 |
| Filler Content | 15 | Matrixx Method |
| Specific Gravity | 1.00 | ASTM-D792 |
| Notched IZOD Impact, ft-lb/in | 2.0 | ASTM-D256 |
| Gardner Impact, in-lb | <10 | ASTM-D5420 |
| Tensile Yield Strength, psi | 7900 | ASTM-D638 |
| Tensile Elongation @ Yield | 8 | ASTM-D638 |
| Flexural Modulus (tangent), psi | 380,000 | ASTM-D790 |
| HDT @ 66 PSI, °F | N/A | ASTM-D648 |
| HDT @ 264 PSI, °F | N/A | ASTM-D648 |
| Linear Mold Shrinkage, in/in | 0.002 – 0.005 | Matrixx Method |
| Flammability, 1/8″ & 1/16″ | HB* | UL-94 |
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* Internal Matrixx testing only; not currently approved by Underwriters Laboratories.
