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SPECIFICATION FOR PARSON MANHOLE INSERTS

1. SCOPE
1.1  Contractor shall furnish PARSON MANHOLE INSERTS as called for in the specification.
1.2  The PARSON MANHOLE INSERT shall effectively reduce or prevent surface water
       inflow through manhole covers. The insert shall also prove effective in keeping grit,
       sand, salt, chemical spills, foreign objects, road oils, etc. from entering the manhole
       and collection system lines through the manhole cover.
1.3  PARSON MANHOLE INSERTS shall be manufactured by Parson Environmental
       Products, Inc., P.O. Box 4474, Reading, PA 19606, 1(800) 356-9023.

2. MATERIAL & DESIGN
2.1  The PARSON MANHOLE INSERT shall be manufactured from corrosion proof material
       suitable for atmospheres and conditions commonly found in wastewater collection
      systems.
2.2  The PARSON MANHOLE INSERT shall be manufactured from a "durable"
       High Density Polyethylene Copolymer material that meets ASTM Specification
      Designation D-1248 Class A, Category 5, Type III. This material shall have superior stress
      crack resistance, combined with a high impact strength. 
2.3  The PARSON MANHOLE INSERT shall have a minimum impact brittleness temperature of
        -105°F in accordance with ASTM D 746-70.
2.4  Softening temperature shall be 254°F, meeting all requirements of ASTM D 1525-70.
2.5  The PARSON MANHOLE INSERT shall have a tensile strength of 3700 psi and an
      elongation factor of 800%, meeting all requirements of ASTM D 638-71A.
2.6  The thickness of the PARSON MANHOLE INSERT shall be a uniform 1/8”.
2.7  The PARSON MANHOLE INSERT shall be manufactured to dimensions provided by the
       purchaser to allow easy installation within the manhole frame.

3. VENTING
3.1  The insert shall have one of the following systems for relieving gas and/or vacuum
       pressure from the manhole:
3.2  Two 3/16” holes are installed 180° apart, approximately 1" from the top of the insert, to
      allow for constant ventilation. This "no valve" method of ventilation should not be affected by
      grit accumulation, nor have any moving parts subject to corrosion. The venting system
      shall not allow water to completely fill the insert, which during cold weather could freeze
      and lift the manhole cover.
3.3  An alternative ventilation system utilizes one valve manufactured of Polypropylene
       Ethylene compound. The valve material shall be unaffected by temperatures within a range
       of -70°F to 350°F. The valve body and components shall be corrosion and wear resistant
       and be designed to release gas pressure at approximately 1 psi.

4.  GASKET (optional)
4.1  The insert shall have either a closed cell neoprene or cross-linked polyethylene gasket
       installed upon the insert rim by the manufacturer.

5.  MEASUREMENT
5.1  The PARSON MANHOLE INSERT shall be manufactured to fit the manhole frame rim
       upon which the manhole cover rests.  Exact measurements shall be required from the
       purchaser.
5.2  Instructions and measuring diagrams will be made available to the purchaser, to insure a
       proper fit of the PARSON MANHOLE INSERT within the manhole frame.

6. INSTALLATION
6.1  The manhole frame rim shall be cleaned of all dirt and debris before placing the PARSON
       MANHOLE INSERT upon the rim.
6.2  The PARSON MANHOLE INSERT shall be fully seated around the manhole frame rim.
6.3  The manhole cover is replaced as before, and the installation is complete.

7.  REMOVAL
7.1  The PARSON MANHOLE INSERT shall have a corrosion resistant polypropylene strap
       installed for easy removal and re-installation into the manhole frame.

 8.  ACCEPTANCE
8.1  Completed installations must meet engineer's approval.

9.  TESTING
9.1  After installation of PARSON MANHOLE INSERT, the complete unit shall not allow more
       than 5 gallons of inflow per 24 hours.

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