Siphonic System

Our siphonic system setup comprises of high quality stainless steel siphonic roof outlets, high density polyethylene (HDPE) pipes, fittings and a professional support package, the siphonic rainwater drainage system that allows the complete drainage of water from the roof without the requirement of a slope in the pipework, thus saving valuable space, set-up time and money. Our siphonic rainwater drainage system has been used in both the industrial and commercial sectors. This includes flat (concrete deck) roofs and any form of roof shape, which drains into a box gutter or eave gutter. Our siphonic rainwater drainage systems implemented so far include Industries, Warehouses, Shopping Malls, Office buildings, Apartment buildings, Sporting facilities, Multi-story car park decks and we efficiently undertake the Renovations of existing drainage systems too. The innovative component of our siphonic rainwater drainage system is the specially designed roof outlet which controls the pattern of discharge, preventing air from entering the pipework. By minimizing the intake of air into the system, the water creates a siphoning effect, maximizing the suction of the water into the outlet.

The concept of the siphon has been recognized since ages. A siphon is formed by a tube or other type of channel filled with the fluid to be siphoned, thereby creating a continuous and closed path. In a siphon mechanism, the release end of the channel will usually be lower than the level of the fluid at the source. Atmospheric pressure at the reservoir surface develops the driving force in pushing the fluid through the tube to the point of discharge at the lower end. The roof drain has an air baffle that promotes a full-bore flow. Flow is induced by natural hydraulic action of siphoning. When system primes, the piping depressurizes. Atmospheric pressure pushes the water into the drains with a considerable force. Despite the name, siphonic roof drainage does not work as a siphon; the technology makes use of gravity induced vacuum pumping to carry water horizontally from multiple roof drains to a single downpipe and to increase flow velocity Metal baffles at the roof drain inlets reduce the injection of air which increases the efficiency of the system. One benefit to this drainage technique is reduced capital costs in construction compared to traditional roof drainage. Another benefit is the elimination of pipe pitch or gradient required for conventional roof drainage piping. However this system of gravity pumping is mainly suitable for large buildings.