Snap-Tite Pipe

Polyethylene piping systems are defined or specified using two important criteria: the ASTM D3350 cell classification and the ASTM F412 thermoplastic piping material designation code. The ASTM D3350 consists of a series of six digits followed by one letter. The six digits equate to the specified level of performance required in six separate physical properties defined within the standard. The final letter specifies the color or UV-resistance requirement. Taken together the D3350 cell classification establishes a minimum range of technical performance for the PE compound used to produce the pipe.

The F412 thermoplastic piping material designation code further defines the performance requirement of the pipe produced from a particular PE compound. This code consists of an abbreviation for the basic material as defined within the ASTM standards. The standardized abbreviation for polyethylene is the term “PE”. This basic polymer designation is then followed by a series of four digits. The first two digits relate directly to specific physical properties for the compound as defined within ASTM D3350. The last two digits are the long-term hydrostatic stress rating as recommended by the Hydrostatic Stress Board of the Plastic Pipe Institute in hundreds of psi. The long-term hydrostatic stress rating is the hydrostatic design basis (HDB) multiplied by the appropriate design factor (DF).

Specifications

ISCO’s Snap-Tite pipe features the patented Snap-Tite joining system which will ensure an easy-to-install, reliable, water-tight seal. Snap-Tite is constructed of solid-wall polyethylene pipe and provides flexibility for lining obstructed culverts with the possibility of offset joints or slight bends.

  Pipe SDR lbs/ft I.D. Minimum Wall Thickness
10″ (10.750 OD) 32.5 4.75 10.088 0.331
12″ (12.750 OD) 32.5 6.67 11.966 0.392
14 OD 32.5 8.05 13.138 0.431
16 OD 32.5 10.5 15.016 0.492
18 OD 32.5 13.3 16.892 0.554
20 OD 32.5 16.41 18.77 0.615
22 OD 32.5 19.86 20.646 0.677
24 OD 32.5 23.62 22.524 0.738
26 OD 32.5 27.94 24.304 0.8
28 OD 32.5 32.19 26.276 0.862
30 OD 32.5 37.196 28.043 0.923
32 OD 32.5 42.04 30.03 0.985
36 OD 32.5 53.2 33.784 1.108
42 OD 32.5 72.37 39.416 1.292
48 OD 32.5 91.62 45.05 1.477
54 OD 32.5 119.7 50.676 1.662
63.2 OD 32.5 163.46 59.02 1.945

Cost Effectiveness

Several studies have revealed that the largest expense on culvert projects is not the pipe itself, but the installation, inspection, maintenance, road repair, and liability. Because the Snap-Tite Culvert Lining System is so easy to install, it reduces your overall culvert renewal costs. Snap-Tite saves on labor costs by eliminating the time-consuming process of cutting and repairing roads. There’s no need for specialized equipment, so you save money on costly rentals and labor. And just think, during down times from mowing or snow removal, your existing highway crews can be productive by lining deteriorating culverts. but don’t take our word for it, examine the comprehensive cost justifications performed by these states. Read more

Flow Characteristics

Snap-Tite has an extremely smooth inside surface and maintains its excellent flow properties throughout its service life due to its excellent chemical and abrasion resistance. Because of its smooth walls and non-wetting characteristics, a higher flow capacity and a reduced friction loss is possible. Snap-Tite typically has a Manning roughness coefficient of 0.009 and a Hazen Williams flow factor of 155. The charts on the following pages demonstrate how the Snap-Tite system gives you a more durable pipe with a smaller ID that carries as much, if not more fluid than the original pipe!

 

Some of the characteristics of Snap-Tite® Solid-wall HDPE Pipe

  • Economical
  • Flexible
  • Corrosion Resistant
  • Mechanically Joined
  • Hydraulically Smooth
  • Strong and Ductile
  • Long Design Life
  • Weather Resistant
  • Tappable
  • Impact Resistant
  • Chemically Resistant
  • Freeze Resistant
  • Easily Installed
  • Durable
  • Small to Large Diameters
  • Abrasion Resistant
  • Non-Toxic
  • Inert
  • Lightweight
  • Listed and Approved
  • Reliable

 

Important Standards for High Density Polyethylene (HDPE) Pipe

Standards important for Snap-Tite® HDPE pipe relate to the resin the pipe is made from and the standards related to manufacturing sizes and tolerances.

ASTM Standards:

ASTM D3350
Standard Specification for Polyethylene Plastics Pipe and Fittings Materials. This standard defines the physical properties of the resin.
ASTM F714
Standard Specification for Polyethylene (PE) Pipe (SDR-PR) Based on Outside Diameter. This standard is used for most large diameter HDPE pipe (6″ to 63″) Applications.
ASTM D2321
Standard Practice for Underground Installation of Thermoplastic Pipe for Sewers and Other Gravity Flow Applications.
ASTM F585
Standard Practice for Insertion of Flexible Polyethylene Pipe into Existing Sewers
ASTM D3212
Standard Specification for Joints for Drain and Sewer Plastic Pipes Using Flexible Elastomeric Seals

Industry Standard for Culvert Relining:

AASHTO M326
Polyethylene (PE) Liner Pipe, 300-to1600-mm Diameter, Based on Controlled Outside Diameter

Since one-third of exisiting culverts are arched, Snap-Tite® again has come up with a solution: oval pipe. It has the same benefits as smooth-wall HDPE Snap-Tite®, yet made for a better fit into an existing arched culvert.

The Snap-Tite® Culvert Lining System actually outperforms both the round and oval concrete and corrugated metal pipes it rehabilitates.
Lightweight, flexible, durable HDPE has an indefinite service life and the Snap-Tite® culvert lining joining system assures a water-tight seal at all joints.

Flowed in Lined CMP Based on Mannings Equation

CMP Size (inches) Equivalent Snap-Tite Round OD Outside Liner Dim(in) Inside Liner Dim(in) Flow Q(cfs) Snap-Tite % of Flow
Size (in) Q(cfs)   minor major minor major    
20in. 28in. 3.7 20″ 16.5 23 15.1 21.7 4.7 128%
24in. 35in. 6.3 26″ 20.5 30.5 18.8 28.8 9.2 145%
29in. 42in. 10.3 30″ 22.5 36 20.3 34 12.6 122%
33in. 49in. 15.1 36″ 30 41.1 27.7 38.7 22.9 152%
38in. 57in. 22.2 42″ 34 48.9 31.3 45.9 33.7 152%
43in. 64in. 30.6 48″ 39 55.6 35.9 52.3 48.3 158%
47in. 71in. 39.5 48″ 39 55.6 35.9 52.3 48.30 122%
52in. 77in. 50.4 54″ 47 60.2 43.5 56.6 70 139%
57in. 83in. 63.1 54″ 47 60.2 43.5 56.6 70 111%
63in. 87in. 77.1 63″ 58 67.6 53.9 63.5 109.1 141%
* flow is based on slope of .1% HDPE n=.00914 / CMP n=.024

Flow in Lined RCP Based on Mannings Equation

RCP Size Equivalent Snap-Tite Round OD(in.) Outside Liner Dim Inside Liner Dim Flow Q(cfs) Snap-Tite % of Flow
Size(in.) Q(cfs)   minor major minor major    
19in. 30in. 6 22″ 17 26 15.6 24.6 5.7 96%
24in. 38in. 11.1 28″ 21 33.6 19.2 31.7 10.6 95%
29in. 45in. 18 32″ 26 37 23.9 34.9 16.4 91%
34in. 53in. 27.7 40″ 31 46.3 28.4 43.6 27.6 100%
38in. 60in. 37.8 42″ 34 48.7 31.3 45.9 33.7 89%
43in. 68in. 52.7 48″ 39 55.6 35.9 52.3 48.3 92%
48in. 76in. 70.8 54″ 44.6 62 41.1 58.4 67.1 95%
53in. 83in. 91 54″ 47 60.2 43.5 56.6 70 77%
58in. 91in. 116 63″ 52 72.4 47.9 68.1 101.2 87%
63in. 98in. 143.1 63″ 58 67.6 53.9 63.5 109.1 76%
* flow is based on slope of .1% HDPE n= .00914 / concrete n=.015

Ask your Snap-Tite sales rep for additional sizes




    To Order Call
    1-800-CULVERT