Septic Tank Insulation Disc With Flexible Riser Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing septic tanks and soil dispersal systems experience heat loss through poorly insulated manhole covers and risers, leading to freezing of septage due to cold air penetration and ground heat draw, which is not effectively addressed by current insulated manhole covers or foam discs.
Innovation Solution
An insulating disc with a core of R-10 extruded polystyrene sandwiched between HDPE layers, featuring a flexible gasket and retention tabs, designed to seal and center within the riser, and equipped with hooks or eye bolts for easy installation and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If foam discs are installed in the risers, then some insulation is provided, but they do not seal well due to various sizes of risers and imperfections in the risers which makes them not round
Solution Approach 1:
The patent uses a flexible gasket that extends radially outward from the insulating disc to seal against the inner surface of the riser. This flexible membrane adapts to the irregular shapes and varying dimensions of different risers, creating an effective seal despite manufacturing imperfections and non-circular cross-sections.
Solution Approach 2:
The insulating disc is designed with adjustable parameters including different diameters to fit various riser sizes, and the flexible gasket can deform to accommodate dimensional variations. This allows the same basic design to effectively seal risers of different sizes and shapes.
2Object-affected harmful factors
If insulated manhole covers are used, then cold surface air is prevented from dropping into the tank, but they do not effectively keep the cold or frozen ground from drawing heat away from the tank contents through the poorly insulated riser
Solution Approach 1:
Instead of only insulating the top surface (manhole cover), the patent places insulation within the riser structure itself, addressing heat loss in the vertical dimension. The insulating disc positioned inside the riser blocks thermal transfer through the riser walls, complementing the top insulation.
Solution Approach 2:
The insulating disc acts as an intermediary barrier between the cold external environment and the warm tank contents. It is positioned within the riser to intercept heat transfer before it reaches the tank, providing thermal protection at a critical intermediate location.
3Ease of operation
If the manhole cover is brought to the surface for maintenance and inspection, then access is provided, but heat from inside the tank escapes and cold air drops down into the tank
Solution Approach 1:
The insulating disc is pre-installed within the riser structure before the lid is removed for maintenance. This preliminary insulation remains in place during maintenance operations, continuously blocking heat loss and cold air infiltration even when the lid is open, without interfering with access.
4Loss of energy
If foam discs are installed as far down in the riser as the user can reach, then some insulation is provided, but they are not convenient to use and seldom able to be installed deeper than the frost
Solution Approach 1:
The insulating system is divided into modular components: the insulating disc body and the flexible gasket. This segmentation allows the disc to be inserted through the accessible opening and positioned deeper in the riser than would be possible with a single-piece design requiring manual manipulation throughout installation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively prevents heat loss and cold air ingress, maintaining tank warmth, reducing freezing risks, and facilitating easy maintenance while sealing odors and gases, thus improving biological activity.
Implementation Method 1
The insulating layer can be formed of an extruded polystyrene foam that has an insulating value of R-10 or greater
Implementation Method 2
A flexible gasket can be disposed about the outer perimeter of the top layer and extend circumferentially radially outward from the top layer. The gasket can be formed of a silicone or rubber material.
Data Source
AI summary
An insulating disc can be easily installed and removed from inside a riser of a septic tank. The insulating disc is seated atop an opening of the tank lid and seals around the riser inner surface. The disc can include a core formed of R-10 extruded polystyrene sandwiched between two layers of high-density polyethylene. A flexible gasket can extend outward from the disc to seal against the inner surface of the riser. Retention tabs can also be provided to center and hold the disc in place. The disc can be divided into two semicircular halves that are hinged together. A hook, eyebolt and/or rope can be used to aid in removing the disc from the riser.