Guideline to Specification

1. Scope

This specification apples to the furnishing of all labor, materials and services in connection with the manufacture. testing, delivery and installation of large diameter underground glass fiber reinforced piping, fonts fittings. and specials as specified in the engineering documents and drawings.

2. Codes and Standards

All pipes, joints and fittings supplied under this specification shall, as a minimum, meet the requirements of AWWA C950. AWWA Standard for Fiberglass Pressure Pipe, and ASTM D3517 Standard Specification for Fiberglass (Glass Fiber Reinforced Thermosetting Resin) Pressure Pipe in the case of pressure pipes and ASTM D3262 Standard Specification for Fiberglass (Glass-­Fiber Reinforced Thermosetting Resin) Sewer Pipe. in the case of gravity sewer pipes.

2.1 Test Methods

• ASTM D638 standard Test Method for Tensile Proper. ties of Plastics.
• ASTM D1586 Standard Method for Penetration Test and So it barrel Sampling of Soils.
• ASTM D2290 Standard Test Method or Apparent Tensile Strength of Ring or Tubular aria Reinforced Plastics by Split Disk Method.
• ASTM D24 12 Standard Test Method for External Loading Properties of Plastic Pipe by Parallei-plate  Loading.
• ASTM D2487 Standard Test Method for Classification of Soils for Engineer Engineering Purposes.
• ASTM D2583 Standard Test Method for Indentation Hardness of Rigid Plastics by Means of a Barcol impressor.
• ASTM D2992 Standard Method for Obtaining Hydrostatic Design Basis for Fiberglass' (Glass Fiber Reinforced  Thermosetting Resin) Pipe and Fittings.
• ASTM D3567 Standard Method for Determining Dimensions of Fiberglass (Glass Fiber-Reinforced Thermosetting Resin) Pipe and Fittings.
• ASTM D3681 Standard Test Method for Chemical Resistance of' Fiberglass (Glass Fiber-Reinforced Thermosetting Resin) Pipe in a Deflected Condition.

2.2 Product Standards

• ASTM D3754 Standard Specification for Fiberglass (Glass Fiber Reinforced Thermosetting Resin) Sewer and Industrial Pressure Pipe.
• ASTM D4161 Standard Specification for Fiberglass (Glass Fiber Reinforced Thermosetting Resin) Pipe Joints Using Flexible Elastomeric Seals.

3. Product Description

 3.1 Materials

• Resin Systems

The manufacturer will use only approved. polyester resin systems for which he can provide documented performance in this particular application The data shall have been acquired from a composite material of similar construction and composition as the product proposed for this project.

 

• Glass Reinforcements

The reinforcing glass fibers used to Plastics manufacture the components shall be of highest quality commercial grade of glass filaments suitably treated with binder and sizing compatible with impregnating resins.

 

• Fillers

Silica sand or other suitable materials may be used as fillers in the laminates.

 

• Additives

Resin additives such as pigments. dyes, and other coloring agents, if used shall in no way be detrimental to the performance of the product nor shall they impair visual inspection of the finished product.

 

• Elastomeric Sealing Rings

Elastomeric Sealing rings must be supplied by recognized, acceptable quality manufacturers The elastomeric compound used must be compatible with the use environment.

3.2 Manufacture and Construction

•  Pipes

The pipes shall be supplied in accordance with the diameters and tolerances specified in section 3.3 They snail be manufactured by a controlled reproducible process using the materials described in Section 3.1 to result in a corrosion resistant, composite structure to meet the operating conditions for this project as detailed in Appendix B. Stiffening ribs or rings may be used to increase the overall pipe stiffness They can be of glass fiber filament wound or glass fiber woven roving construction using similar resins as used in the pipe cylinder.

 

• Couplings

The pipe shall be field connected with glass fiber reinforced sleeve coupling that utilize elastomeric Sealing rings as the sole means to maintain joint water tightness. The fonts must meet the Performance requirements of ASTM D4161.

 

• Fittings

Flanges bends, reducers, tees, wyes, and other fittings shall when installed be capable of withstanding all operating conditions given in ,Appendix B The; may be contact molded or manufactured from mitered sections of pipe joined by glass fiber reinforced polyester overlays.

 

3.3  Dimensions

• Nominal Diameters

  Pipes will be supplied in accordance with the following nominal diameters

 

• Actual Dimensions:

  Pipes can be supplied in accordance with an ID or OD series. 

1. I D Series: The inside diameter of the pipes will be the nominal diameter + 1 % with a maximum tolerance of + or - 25mm and a minimum tolerance of + or - 6mm.
2. O D Series: The outside diameter of pipes will be in accordance with the following table:

 

• Lengths

The pipe standard effective length will be 12 meters with a tolerance of t 25mm.Other section lengths may be supplied for special orders subject to the engineers Approval. A maximum of 10% of the pipe sections maybe supplied in random lengths again subject to the approval of the engineer.

 

• Wall Thickness

The minimum average wall thickness shall be the thickness as stated in section 10 .1.1 The minimum single point thickness shall not be less than 87.5% of the stated thickness.

 

• End Squareness

All pipe ends shall be square to the pipe axis ± 6mm or ± 0.5% of the nominal diameter whichever is the greater.

 

• Tolerance of Fittings

The tolerance of the angle of a bend and the angle between the main and leg of a wye or tee shall be ± 2 °. The tolerance on the laying length of a fitting shall be + 50mm.

 

4. Product Selection

 

4.1 Stiffness

Stiffness selection is dependent on burial conditions and operating vacuum (if it exists). Minimum stiffness requirements must be determined for both parameters and the higher of the two must be the minimum selected Pipes shall be supplied to the following specific tangential initial stiffness (STIS) EI/D3.

 

 

 

• Burial Conditions

Stiffness required for burial conditions shall be selected from the appropriate class considering the native soil conditions and burial depths given in Appendix B. the selection charts given in Fig 1 . A, B, C. D and E and the standard installations by stiff-ness class as detailed in section 7 Classification of typical native soils are given in Appendix A. Fig 2 The burial depths shall be defined in Appendix B and as detailed in the relevant contract drawings Likewise the relative density of the backfill will also be obtained from Appendix B.

 

4.2 Pressure Classes

Pressure classes shall be selected from the table below

 

 

Pressure Class  =(HDB50yr) > Operating

(F of S)     Pressure

 

where HDB50yr = extrapolated 50 year pressure as related to section 5.1 F. of S. = 1.8

 

5. Qualification Testing

The physical properties and characteristics of the pipes shall be determined by prototype testing of the manufactured product These tests need not be co ducted specifically for this Project if prior tests on similar products r Have been previously completes Testing may be conducted on one diameter and extrapolates to other diameters ` the pipes are of similar composition and material arrangement and are Manufactured from the same materials specification using a similar process.

All prototype test results must be retained by the manufacturer and be available or Inspection ray the purchaser upon request.

 

5.1 Hydrostatic Design Basis HDB

The Hydrostatic Design Basis (HDB) will be obtained In accordance with procedure B of AS TM D2992 being  established at a" extrapolated 5O year value.

 

5.2 Long Term Ring Bending Strength Sb

The long term ring bending  Strength (sp) will be determined n accordance with AWWA C950 for water Projects or ASTM D3262. Section 6.3 for sanitary sewer projects The test temperature may be ambient for mar mum operating temperatures no, to exceed 50 °C.

 

5.3 Joints

Coupling joints Shall  be qualifies per the tests of Section 7 of ASTM D4161.

 

 

6. Product Use

• Deflection

The maximum al allowable initial diametrical deflection shall be as follows

 

 

The maximum allowable long term deflect shall be 5%. These values hill apply to all stiffness classes.

 

• Operating Temperatures

The maximum allowable operating temperature of the pipes shall be 50 °C The actual operating maximum temperature is given in Appendix B The minimum allowable operating temperature of the pipes shall be 40 °C.