Product

Sewage Maintenance Access Shafts

The SPEL FG Manhole sewer manhole riser Access Shafts offer great advantages over traditional options.

Traditionally, risers have been manufactured from concrete and epoxy lined, but FRP risers offer lighter weight, corrosion resistance, and compressive strengths greater than most concrete products. Another key issue is corrosion resistance. Instead of using PVC liner or some type of coating, FRP offers a solution which you don’t have to worry about corrosion.

Features

Sewage handling and pressure filtration equipment specialists

The contractor receives the benefits of time and cost and the owner gets 100-year corrosion-resistant design. In Sewage manholes, corrosion resistance is a major concern as many systems are designed to provide storage of combined storm and sanitary sewage in the tunnel after a big rain event. As the rain event subsides, the sewage is gradually released for treatment.

Storage events can lead to increased hydrogen sulfide, which is then released at manholes due to turbulence. Corrosion resistance of the shafts is as important as the sewer line. With FRP Manhole Access Shafts the corrosionresistant offers the highest life cycle costs of any product.

Advantages

Corrosion resistance
100 year Design Life
One piece sealed manhole
ligtweight
Fast installation and ground opening times
Manufactured in control environments
Smooth surfaces and wall
- - cleaner manholes
  - less maintenance
  - no cracking
  - reduction in odour

Sizes

The SPEL FG Manhole has many diameters to cater for all applications; the shafts can be up to 4 meters in diameters with 2.5m take off pipes. The SPEL FG Manhole, is not limited in any way other than transport, the units are delivered in one piece to site ready for connection, saving time and money in the operation. Standard diameters as follows with depths up to transport restrictions:

Standard Specifications

All FRP Manhole Shaft Structures meet the performance intent for the design of a buried Manhole Shaft.All FRP structures will be verified in respect to the design and construction details submitted to the Composites engineer and the appropriateness of the applied design methodology within the bounds of:

AS1546.1:2008 Section 8: Standard Specification for Glass Fibre-Reinforced Plastic Septic Tanks
ASTM D-3753: Standard Specification for Glass-Fiber Reinforced Polyester Manholes.
ASME RTP-1.: Standard Specification for Reinforced Thermoset Plastic Corrosion-Resistant Equipment.
AS2634-1983, Chemical plant equipment made from glass-fibre reinforced plastics (GRP) based on thermosetting resins
ASME RTP-1, Reinforced Thermoset Plastic Corrosion-Resistant EquipmentProduct Construction Method is:
Internal Corrosion Barrier Contact Molded
- - 0.5mm “C” Glass Veil Surface layer with Hetron 922 (or equivalent) Vinyl Ester Resin.
Internal Corrosion Barrier Backing Layers
- - 2.5mm ‘E’ Glass Chop Strand tie layer with Hetron 922 (or equivalent) Vinyl Ester Resin.
Structural Laminate
- - ‘E’ Glass reinforcement in chopped and continuous strands.
  - Minimum glass content 50% (Thickness according to XTD Drawings)
Structural Stiffeners
- - Polyurethane Foam rib former overlaid with ‘E’ Glass reinforcement in chopped and continuous strands. Minimum glass content 50%
  - (Thickness according to XTD Drawings)
External Surface – Final surface
- - 0.5mm “C” Glass Veil Surface layer with Hetron 922 (or equivalent) Vinyl Ester Resin.
External Surface – Sealer
- - Pigmented ISO/NPG Flowcoat for external protection.

Design

The Sewer Manhole structures are designed within the constraints of:

AS1546.1 :2008 Section 8: Standard Specification for Glass Fibre-REinforced Plastic Septic Tanks
ASTM D-3753: Standard Specification for Glass-Fiber Reinforced Polyester Manholes.
ASME RTP-1.: Standard Specification for Reinforced Thermoset Plastic Corrosion-Resistant Equipment.
AS2634-1983, Chemical plant equipment made from glass-fibre reinforced plastics (GRP) based on thermosetting resins
ASME RTP-1, Reinforced Thermoset Plastic Corrosion-Resistant Equipment Design with the following processThe Engineering process is:
- Full set of Engineering Design Calculations
  - - Shaft, Roof and Base Calculations
    - Anti-Floatation Ballast Calculations
- Design Verification for:
  - - Engineering Design
    - Anti-Floatation, Back fill and Installation details

The Manhole is engineered for trafficable area’s allowing the one unit to suit all applications, the top apron slab will need to take into account the subjected area traffic loadings.

SPEL FG Manhole Brochure

product brochure

Installation

A FRP Manhole can be installed in 1 day. Fast installation times with corrosion resistance gives the asset owner years of trouble free service and decreases asset life cycle costs.

installation

SPEL FG Manhole Design

design/parts

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In Action

The proof is in the pudding. We invite you to take a moment to review our case studies, projects, videos and images showcasing the Sewage Maintenance Access Shafts.

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