BOP
tomenu
 
Introduction
The BOP (Bytes in Old Pipes) system was developed and patented worldwide by Prusak GmbH Grub, Switzerland. In cooperation with the British cable producer Brand-Rex (which turns out products know as BloLite and BloCable), and with the US Electronics Corporation Tyco, Ekoline is now marketing a complete system for the laying of glass fibre networks in passable and non-passable sewers starting from 100 mm Diameter. Since they are available practically everywhere, community networks, such a sewage systems, are ideally suited for the laying of such cables.
 
Laying with BOP
A hose is turned inside out from one side, not unlike in connection with the linear rehabilitation work. It is immaterial whether one resorts to an inversion drum with air or with the addition of water. At the start of the laying operation, the cables or cable ducts are confined in a pipe within an impregnated felt module. A robot, that is to say a TV camera with a cable laying appliance, lifts the felt module and deposits it against the internal surface at the apex of the pipe. The hose serves to press the felt module against the wall of the pipe and moves forwardly in response to rising pressure. At the same time, the camera advances rearwardly in front of the hose and positions the felt module. The velocities of the hose and of the camera are controllable. The just described procedure exhibits the advantage that the cables are laid exactly at the desired locations. Moreover, and since the cables and the ducts are not rigid but flexible, it is possible to avoid all inlets in the pipe by turning the laying appliance. The resin hardens, subsequent to laying of the cable, in response to the introduction of hot water into the ducts, and the hose is thereupon extracted. Such laying technique can be combined with practically all hose laying technologies.
 
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| Laying with simultaneous rehabilitation of the pipe | Laying without rehabilitation |
Resins
If one wishes to rehabilitate simultaneously, one normally employs the same resin as in the liner rehabilitation technology. If only laying is to take place, we employ special resins furnished by different manufactures, namely those which are intended for the existing pipe material and properly adhere thereto. During the high pressure rinse, the employed materials should be capable of withstanding water pressure up to 300 bar.
  
Advantages of BOP
Numerous advantages of BOP will be readily apparent. One the one hand, this include the advantages over the standard rehabilitation: it is not necessary to dig, one is not dependent upon the weather, the laying can be carried out at a fast pace and the pipes are safe owing to their deep position. However, BOP also exhibits additional advantages:
Advantages for the operators of the sewerage system:
• It is possible simultaneously rehabilitate in one operation
• The cables do not hang freely in the pipes
• No anchors or metallic rings in the pipe
• No obstacles to the flow of sewage
• Replacement or enlargement of the net is possible at any time
• without adverse effect upon the sewage system
• All canalization work including rinsing, leakage tests of entire sections,
• as well as of pipe collars, is possible at any time
• No obstructions in the manholes by cables
• Rehabilitation, either localized or entirely, can be carried out even years
• after the laying of cables without being necessary to remove the cables
Advantages for communication companies
• No digging for laying of new data networks
• No lengthy permit procedures
• Rapid laying of cables
• Trenchless laying all the way to the ultimate customer
• Safe data nets
• Combination of various cables or cable ducts possible
• Establishment of connection to the network
• through any manhole possible at any time
• Glass fibre ducts can be exchanged at any time without digging
• Capacity can be increased at any time by new cables
• Data cables are completely embedded in resin
• and are thus protected from moisture
• Protected from rodents
 
 
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| BOP with protected duct cable installed for cable | Cable installed |
 
MicroBlo
The MicroBlo method of the Firm Brand-Rex is best suited for the laying into the sewage systems. It involves the utilization of small protective pipes, called microducts, into which small bundles of cables are blown in the next step. The insertion is carried out without any stressing of the fibres such as mechanical push or pull. The fibres are identical with fibres, which are employed in conventional cables. Furthermore, if necessary, the cables can be simply blown out replaced with future generations of even more efficient fibres. All this can be performed without digging, simply by resorting to air.
 
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| BloCable module | BOP with BloCable |
Laying in pressure lines
BOP can be readily inserted also in water- and gas pipes. Here, the laying is even simpler and faster because the modules can be laid in the bottom parts of the pipes.
 
Granted Patents
Europe Patent No.1100999
US Patent No. US6,572,306 B2
Hong Kong Patent HK1037703