CORRUGATED GRAVITY PIPES

Advantages

The unique and environmentally friendly KAI Corrugated Pipes is superior to other pipes because of its:

• LIGHT WEIGHT
• EASY TO INSTALL
• ADAPTABILITY TO EXISTING SYSTEMS
• RESISTANCE TO CORROSION AND ABRASION
• RESISTANCE TO ULTRA-VIOLET RAYS AND CHEMICALS
• FLEXIBILITY
• IMPACT STRENGTH
• OPTIMUM HYDRALICS
• LOW RUNNING AND MAINTENANCE COSTS

KAI Corrugated Pipes are also extremely cost effective because they can be;

• Telescoped for transportation and storage, lowering cost thereof
• Stacked up to 2.5m high, saving on storage space

Size

KAI Gravity Pipes are available in sizes ranging from 200mm to 1200mm (Nominal Inside Diameter) and are manufactured in accordance with the European Standard prEN-13476-1. The ring stiffness class of these pipes is 8kN/m2 for size 200mm – 900mm, ad 4kN/m2 for sizes 1000mm and 1200mm.

Lenght

Plain-ended pipes are available in unit length of 6 – 12m or more Integral bell with spigot pipes come in nominal lengths of 6m.

Integral Bell Joints with Seals

Integral bell joints have a bell at one end and a spigot at the other end. The technique is a pushift method with the seal made of high quality EDPM, specifically designed to mould with the corrugation of the pipe’s outer surface.

LAYING OF PIPES

KAI Gravity Pipes offer a distinct eight advantage compared with other piping products. Installation therefore:

REQUIRE LESS MANPOWER AND LIGHTER MACHINERY TO TRANSPORT, HANDLE AND CONNECT SAVES TIME BECAUSE LONGER LENGTHS OF PIPE CAN BE LAID UP TO THREE TIMES FASTER THAN THE SAME DIAMETER CONVENTIONAL PIPE BECOMES EASIER BECAUSE OF ON-SITE CUTTING AND TRIMMING

INSTALLATON PROCEDURE FOR HPDE CORRUGATED TWINWALL PIPES

• The trench foundation should be smooth, stable and free from roots, rocks and other sharp objects.
• The height of bedding should be 150mm and should consist of Soil Classifiable as ASTM D 2321 Type II SP compacted to 90% DPr (Degree of Proctor).
• Haunching and back filling soil type is the same as used for bedding and soil should be placed to successive lift of 150mm and compacted to 90% DPr.
• Height for final back fill – 300mm.

MANHOLE CONNECTIONS

Manholes and catch basins provide:

• Points for changes in pipe grade, direction, and size
• Allow storm runoff to enter
• Provide for system access

The method used to join the pipe and the structure depends on the project needs, type of pipes, and the style of the structure.

Concrete Manhole – The most common practice for KAI Gravity Pipe is to fix the pipe into the concrete manhole or basin opening, with a mixture of concrete and aggregate. The mixture should be pressed between the corrugated pipe and manhole opening. This type is soil tight, as a minimum and acceptable for the majority of storm sewers. Because of the corrugated exterior, this connection also creates a water stop effect.

CONCRETE MANHOLE FOR STORM WATER APPLICATION

Polycrete and GRP Manholes - KAI Gravity Pipe is directly connected to a Polycrete or GRP manhole. Double gaskets are mounted on the KAI Gravity Pipe and pushed in the inlet/outlet of the manhole.