Tricon Piping Tricon Piping Systems
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Steam, Condensate, High Temp. Hot Water, Process Piping, Fuel Oil
Carbon Steel
Mineral Wool, Fiberglass, Calcium Silicate, Cellular Glass
10 ga. Spiral Buttweld
Polyurethane Foam
Up to 450 °F / 232 °C
20 Ft. - 40 Ft.
System Specifications
Pipe Size Insulation Thickness (IN)* Steel Conduit O.D. Outer Insulation (IN)* HDPE Jacket O.D. (IN) System Temperature
1” 1” 6.63” 1½” 10.00” Based on a minimum 3’-6” burial depth. 353° operating temperature, 50°F ground temperature and soil conductivity of 15 BTU-IN/HR-F²-°F and mineral wool insulation
2” 1” 6.63” 1½” 10.00”
3” 1½” 8.63” 1½” 12.43”
4” 1½” 10.75” 1½” 14.06”
5” 1½” 10.75” 1½” 14.06”
6” 1½” 12.75” 1½” 15.87”
8” 2” 16.00” 1½” 19.80”
10” 2” 18.00” 1½” 22.17”
12” 2” 20.00” 1½” 24.00”

Service Pipe:
Carbon steel service pipe shall be standard weight A53 ERW or A106 seamless beveled for welding. Condensate return piping shall be Schedule 80. All joints for pipe 2 ½” and larger in size shall be buttwelded. Sizes 2” and smaller shall be socket welded. Straight lengths of piping will be supplied with 6” of piping exposed at each end for field joint fabrication. Where possible, piping lengths shall be supplied in 40 Ft. random lengths.

Insulation: (Inner Layer)*
Service pipe insulation shall be fiberglass, mineral wool, calcium silicate or cellular glass. The insulation will be held in place by aluminum bands on 18-inch centers. The insulation shall be applied to a thickness as specified on the contract drawings.

Service Pipe Supports:
The service pipe within the inner-conduit shall be supported at not more than 10 feet intervals. The supports shall be designed to allow for continuous airflow and draining of the conduit system. The insulated service pipe shall not bear directly on the steel support and shall be insulated throughout.

Outer Conduit:
The outer conduit shall be a smooth wall, spiral welded or electric resistance welded steel pipe conforming to ASTM Specification A-139. The conduit shall be of thickness as listed below.

Conduit Size Conduit Thickness
6” – 26” 10 Gauge
28” – 36” 06 Gauge
38” - 42” 04 Gauge

Insulation: (Outer Layer)*
The outer conduit insulation shall be polyurethane foam with a minimum 1-inch thickness. The polyurethane foam shall have a minimum density of 2.0, and a closed cell content of 90% to 95% per ASTM D-2856, and shall have a “K” factor of .14 per ASTM C-177 @ 75° F.

Exterior Casing:**
The exterior casing shall be seamless, extruded High Density Polyethylene (H.D.P.E.) ASTM-1248, with the following physical properties:

  • » ASTM D-3350…Resin Type III, Grade P34
  • » ASTM D-638…Ultimate Elongation 850%
  • » ASTM D-638…Tensile Yield Strength 3300 psi
  • » ASTM D-790…Tangent Flexural Modules 175,000 psi

No polyethylene tape casings will be allowed.

Field Joint Closures:
Conduit field joint closures shall consist of the specified inner insulation, a cylindrical 10-gauge sleeve having one (1) horizontal split, insulation outer layer of polyurethane foam and a heat shrinkable sleeve with rockshield.

Fittings, end seals and anchors shall be factory fabricated and insulated to prevent the ingress of moisture into the piping system. All sub-assemblies shall be designed and factory fabricated to allow for complete draining, drying and testing of the conduit system. All fittings larger than 2” will be made with long radius weld fittings and shall be the same wall thickness as the service piping.

Expansion Loops and Elbows:
Expansion loops and elbows shall be factory manufactured in the same manner as the straight lengths of piping. Loops and elbows shall be sized and designed to permit thermal movement of the service pipe without damage to the insulation.

Trenches shall be maintained dry until final field closure is complete. The installing contractor shall handle the piping system in accordance with the directions furnished by the manufacturer and as approved by the architect and engineer. The service piping shall be hydrostatically tested to 1-1/2 times the operating pressure, or as specified in the contract documents. The inner conduit shall be air tested at 15 psig. The test shall be maintained for a minimum time of 1 hour. EXERCISE DUE CARE WHEN INSTALLING AND TESTING THE PIPING SYSTEM.

A 4-inch layer of sand or fine gravel, less than ½” in diameter, shall be placed and tamped in the trench to provide uniform bedding for the Steel-Con Plus system. Once the system is in place, the trenches shall be carefully backfilled with similar material and hand tamped in 6” layers until a minimum of 12” above the top of the preinsulated pipe has been achieved. The remainder of the backfill shall be void of rocks, frozen earth and foreign material. The trench shall be compacted to comply with H-20 Highway loading.


  • » Heat Tracing
  • » Leak Detection

System Options:

  • » *Insulation thickness will vary depending on the type of insulation specified and the operating temperature.
  • » **Optional non-metallic casings for below grade offered include, Filament Wound FRP.

Contact your Tricon representative for available sizes and system options.


This product literature and the recommendations for usage is intended for use by personnel having knowledge of industry accepted practice under normal operating conditions. Variations in environment, operating temperatures or extrapolation of data may cause unsatisfactory results. Tricon Piping Systems, Inc. recommends consulting your design engineer to verify the suitability of our products for your intended application. The information contained in this website is subject to change without notice.