HDPE Manholes-VALVE BOXES-Sumps-Tanks
HDPE MANHOLE APPLICATIONS
HDPE manholes are used in applications where corrosion or unstable soil conditions would reduce the life of traditional concrete manholes.
HDPE manholes, sumps, valve boxes and other HDPE structures are used in LANDFILLS, PAPERMILLS, CHEMICAL PLANTS, and REMEDIATION SITES and MUNICIPAL or other applications where corrosion/abrasion resistance is important or where unstable ground conditions exist.
SANITARY SYSTEMS where hydrogen sulfide shortens the life of concrete manholes are excellent candidates for HDPE manholes. HDPE is inert and resistant to most acids and bases. HDPE manholes eliminate ex-filtration and infiltration, reducing the amount of treatment required.
MANHOLE sizes available:
Available solid wall manhole sizes in inches: 18-24-32-36-42-48-54-63. All solid wall manholes are OD sized and available in sdr 32.5 to sdr 17. Available profile wall manholes in inches: 36-42-48-54-60-66-72-84-96-108-120. All profile wall manholes are ID sized and are available in RSC class 100 – 160 – 250.
HDPE MANHOLE CONSTRUCTION:
HDPE manholes, sumps, valve boxes and other HDPE structures are custom fabricated to the design engineer’s specifications. Inlets/outlets can be positioned at any position or height on the manhole. Inlet/outlets may be designed flanged or plain end for butt fusion or electro-fusion connections.
Bottoms of high density polyethylene manholes are extrusion welded inside the manhole and outside the manhole for additional strength. Reinforcing gussets are available on bottoms and where feasible on inlets/outlets. The bottoms can be oversized with concrete poured around them to resist floatation. Anti-floatation rings can also be extrusion welded to resist floatation in high water tables. Manhole bottoms are normally fabricated from 1-1/2 to 2 inch pipe grade sheet stock. Bottoms are recommended to be specified by the design engineer in accordance with ASTM F-1759. Manhole tops can be fabricated hinged, bolted on to a top plate flange and with risers that may call for concrete poured around the top and riser to accommodate h 20 traffic loads. Ductile iron rings and tops can be installed on HDPE manhole risers.
Expandable height manholes can be manufactured using Fusion Support Services Electro-fusion couplings or extrusion welded collars. Expandable manhole segments of 5 to 10 feet may be added to existing manholes, making HDPE manholes prefect for active landfills where future elevation changes are anticipated. Additional sections do not change the ID of the manhole.
In addition to manholes, Fusion Support Services offers HDPE Knock-Out –Pots to dry methane gas in landfills, HDPE valve boxes, HDPE sumps and custom made HDPE tanks.
SPECIFICATIONS FOR HDPE MANHOLES AND FABRICATED STRUCTURES
- Manholes and other HDPE structures shall be fabricated from materials made from high-density polyethylene resin compound with a minimum cell classification of 345464C according to ASTM D 3350.
- This material shall have a minimum long-term hydrostatic strength of 1600 psi when analyzed in accordance with ASTM D 2837.
- The base resin shall have 2 % of well-dispersed carbon black.
- The density of the base compound shall be greater than 0.955 as referenced in ASTM D 1505.
- Tensile Strength at yield shall be greater than 3200 psi in accordance with ASTM D 638.
- Slow Crack Growth Resistance shall be greater than 100 hours (PENT TEST) per ASTM F 1473.
NOMINAL MANHOLE MATERIAL PROPERTIES