| Specification |
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GU POLYPROPYLENE (P.P.) OR FIBERGLASS REINFORCED PLASTIC (F.R.P.)
BASE LINER |
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(A) Scope The manhole base liner shall be a Polypropylene (P.P) or FIBERGLASS REINFORCED PLASTIC (F.R.P.) BASE LINER SYSTEM, which is resistant to the chemical environment normally found in wastewater transmission systems. The P.P./F.R.P. Base Liner shall be a non-load bearing component integrally cast and adequately anchored inside new precast concrete manhole base sections during concrete casting process at the concrete precaster's manufacturing facility. |
(B) POLYPROPYLENE OR FIBERGLASS MANHOLE BASE LINER
(1) The prefabricated P.P./F.R.P. base liner shall be a one piece construction of unlayered, homogenous composite. Minimum thickness shall be .12" - .20" (3 mm - 5 mm) and shall be in lengths and nominal inside diameters corresponding to the precast concrete base section. (2) The prefabricated P.P./F.R.P. manhole base liner shall include full flow channels with side walls to the crown of the pipe; inner surface of the bench to have an anti-skid pattern; watertight gasketed pipe bell connections or P.P./F.R.P. / PVC boot hole sleeves to suit specific pipe types, grade and alignment, shall be monolithically attached to prefabricated P.P./F.R.P. base liners to extend to the outside profile of the precast concrete structure per drawing details. (3) The outer surface of the F.R.P. liner to be aggregate coated and have steel spirals bonded. P.P. liners to have perforated P.P. I beams welded and multi faceted pellets bonded to the outer surfaces. Both bonding mediums to insure adequate anchoring to concrete sections to meet pressure test of 1 bar (14.7 PSI) or the prescribed ASTM criteria for vacuum testing. |
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(C) INSTALLATION IN PRECAST CONCRETE
(1) The P.P./F.R.P. base liner shall be cast integral with the precast concrete manhole base section in accordance with the liner manufacturer's recommendations and specifications. The liner must be fully supported during the casting process; lifting devices shall not penetrate inside walls P.P/F.R.P. base liner. (2) The Wet Cast method is the recommended precasting process for base liners. (3) Inside P.P/F.R.P. liner surfaces shall be free of bulges, dents and other defects that result in a variation of inside diameter of more than 1/4" (7 mm) for base liner flow channel and pipe connections. The precast concrete pipe penetration joint surfaces shall be free of excess concrete at external and internal surfaces to insure proper seal of pipe connection and P.P/F.R.P. liner. |
(D) FIELD ASSEMBLY AND INSPECTION PRECAST CONCRETE MANHOLE WITH P.P./F.R.P. LINER
(1) During the field installation of P.P./F.R.P. lined precast manhole base sections; all pipe connections are to be sealed per the liner manufacturer's standard method and details. Precast concrete sections shall be sealed as prescribed by precast manufacturer and utility specifications. (2) The interior surfaces of the liner shall be completely free from pinholes, cracks, pits or defects that are detrimental to the intended use of the P.P./F.R.P. base liner. No P.P./F.R.P. base liner shall have holes, or openings, which will permit the passage of liquid or gases through the liner wall to precast concrete. There shall be no exposed concrete mortar through inside liner surface to include (but not limited to) pipe penetrations. All mechanical anchor attachments through liner surfaces must be sealed with an approved elastomeric sealant. Consult liner manufacturer for specific information regarding approved sealant supplier list and availability. |
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PROTECTIVE LINER
GU POLYPROPYLENE (P.P.) OR FIBERGLASS REINFORCED PLASTIC (F.R.P.) CONCRETE PROTECTIVE LINER |
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Scope:
Furnish Polypropylene (P.P.) or Fiberglass Reinforced Plastic (F.R.P.) of polyurethane hybrid polymer resin to be installed in sanitary sewer manholes and lift station/ wetwells as a protective surface barrier. The P.P. or F.R.P. polyurethane hybrid polymer liner shall be a non load-bearing component, which is resistant to the chemical environment normally found in wastewater collection systems. The liner shall be prefabricated rigid P.P or F.R.P. sections of unlayered homogeneous composite with an aggregate coated outer surface to insure adequate mechanical anchoring of P.P/F.R.P. liner to concrete/ grout in sanitary sewer structures. |
2.0 Materials: Polypropylene (P.P.) or F.R.P. Polyurethane Hybrid Polymer Composite
2.1 Minimum Thickness: 2.2 Material Properties |
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| 2.3 Physical
Properties (A) Abrasion resistance - Falling Sand (ASTM D968) Thickness of material removed passes
(B) Density of F.R.P. Polyurethane Hybrid Composite (ASTM D1622) - 1.17g/cm3 (C) Shore "A" Hardness Durometer (ASTM D2240) - Exceeds 90 on scale (D) Percolation Test - Water absorption of top surface - 0.032% (E) Thermal shock (CSA-B45-M93) 100 thermal cycles- no sign of surface defects 2.4 Chemical Resistance (A) Chemical Resistance (Selected Reagents) (ASTM D1308)
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