Get answers to your frequently asked questions

    IBAK Inspection

    What pipe sizes will the portable system work in?

    There are two options. The small setup is suitable for pipe diameters 100mm to 600mm, and the larger setup is suitable for pipe diameters 225mm to 1000mm.

    What does the portable system consist of?

    It consists of a 200m portable cable reel, a BK 3.5.1 control box and a suitable camera and tractor with accessories

    How is the portable system powered?

    The unit can be powered by either a small Honda Inverter or a 110v or 240v power supply (this must be specified upon point of hire). This is all that is required to power the complete system

    How long will it take for me to become familiar with this portable system?

    We always provide as much training and support as required. Usually a couple of hours is all that is needed to be able to competently operate the equipment.

    Can I record video footage on the portable system?

    Yes, the BK3.5.1 comes with a built in SD recorder and also a video output to connect to an external source. You can also input text with this control unit.

    Can the camera heads pan and tilt on the portable system?

    Yes, they have full pan and tilt capabilities, as well as many other features.

    IMS Lateral Cutters

    What is the length of the reel/cable on the Hire Fleet cutters?

    Hire fleet Comfort cutter has a 30m cable, whereas the hire fleet Micro Drive cutter has a 100m cable.

    What pipe diameters are the cutters suitable for?

    The Comfort cutter is suitable for 80mm to 250mm diameter pipes. The Micro Drive is suitable for diameters 150mm to 400mm (not suitable for anything smaller than a 150mm pipe).

    LAMPE Sewer Stoppers

    Can I use a Lampe cushion if the pipe is not circular?

     Yes – Lampe cushions can be used in most pipe profiles, including circular, ovoid and square.

    Does the pipe need to be clean?

    Yes, all debris must be removed from the pipe before the stopper is inserted. Any marine life that may be attached to the pipe walls where the pipe is an outfall into a river or the sea also needs to be cleared.         

    What accessories do I need?

    You will need an inflation control with a pressure gauge and an inflation hose, which are provided with every hire. The inflation controller has a pre-set release valve that prevents over-inflation, so must be used every time to prevent damage to the stopper

    Do Lampe cushions require bracing?

    No – since Lampe cushions have a large contact area with the pipe they do not require bracing, unlike conventional cylindrical pipe stoppers.

    There is limited access to the pipe. Will the Lampe cushion fit through small openings?

    Yes, the Lampe cushion can be folded and rolled flat to pass through narrow openings. They are lightweight and easy to handle.

    Is it easy to release the Lampe cushion from the pipe?

    Yes – by slowly lowering the air pressure within the cushion it will allow water to pass under the cushion. This process is continued until all the water is released. The ejector on the Ant Hire controller is then connected and the remaining air in the cushion is expelled.

    Are the cushions resistant to oil?

    Yes, all the cushions in Ant Hire’s hire fleet have been treated to ensure that they are oil resistant

    Can the cushions be repaired?

    Yes – small cuts can be repaired by Ant Hire, while greater damage would be repaired at the Lampe factory.

    Does the cushion have a limited life-span?

    No – since the cushions are not manufactured from rubber they do not age the way conventional cylindrical stoppers do. It is recommended that they are returned to Lampe every 5 years for inspection and service.

    How are LAMPE stoppers different to conventional stoppers?

    Due to a larger surface area in contact with the pipe wall, LAMPE stoppers do not need bracing against movement, unlike conventional stoppers. Each LAMPE stopper is suitable for a larger range of pipe sizes than conventional stoppers, and is suitable for various pipe profiles, not just circular. When deflated they can be folded up and passed through spaces much smaller than their working pipe size. LAMPE stoppers are not made from rubber, so do not have a limited shelf-life. 

    Pressure Testing

    Why should we pressure test?

    In 2000, the BS EN805 was published. This states that all new systems should be demonstrated to be as secure and leak free as possible.

    Are there limits to what I can test?

    In accordance with current guidelines, there is technically no limit to what can be tested provided you have a sufficient water source and a suitable pump that would achieve the System Test Pressure (STP) in an acceptable ramp time. This will be dependant on the approval of the client, however: many water companies state that test lengths should be restricted to 1000m or less. Other factors that should be considered beforehand include the resulting overall test time and the ability to locate a leak if the test fails.

    Do you have to do the same Test for different pipe material ?

    No: A type 2 test should be used on all materials that exhibit creep I.E Polyethylene, PVC  etc. Other materials such as Ductile Iron, Stainless Steel or GRP would normally be tested by measuring the volume. (Water added or water loss methods.)  Unless otherwise stated by the client. 

    Why does it take so long to reach test pressure?

    Is the pump too small for the pipe that is been tested? Or is the air in the line?   Unlike Water, air is compressible. For this reason it would take much longer to reach test pressure on a pipe with air in than without.

    NB Please refers to the BS EN805 for allowable air content on hydrostatic pressure tests

    Is it dangerous to test with air trapped in the pipe?

    Extreme caution should be used on all pipeline pressure tests, particularly when air is involved. It is suggested that the difference in energy between air and water is approx. x 20.000                                        

    Why is the pressure dropping in my Polyethylene Pipe?

    Polyethylene (PE) is a visco- elastic material that exhibits creep; certain elements can have an effect on the characteristics. i.e. Pressure, temperature, backfill etc.     

    Sava Pipe & Drain Stoppers

    Does the pipe need to be circular to use Sava stoppers?

    Yes, the pipe must be circular and within the operating range of the stopper. It must also be free of debris.

    I want to stop the flow in a small manhole with a restricted channel length. Can I use a Sava stopper?

    Yes. The compact range of stoppers for pipe diameters up to 200mm are very short and are ideal for small drainage systems.

    Does the stopper need to be braced?

    Yes, like all cylindrical stoppers they should be braced against movement.

    Can I connect a suction pump directly to the stopper?

    Yes, a range bypass stoppers with a 90° bend male Bauer coupling are available in 4”, 6” or 8”. This means that the suction hose can run vertically up the manhole, saving working area.

    Can I flume straight across a manhole or chamber?

    Yes. This can be done using Lay Flat hose, or in certain applications using an inflatable sleeve from a larger stopper in conjunction with plastic twin wall pipe.

    There is no air supply on site. How can I inflate the stopper?

    A hand pump inflation system is available for smaller diameter stoppers. For larger diameter stoppers, a 9 litre air cylinder with cylinder regulator can be used as the air source.

    Is it possible to over-inflate the stopper?

    No, all of the inflation controllers have a pressure relief valve, plus a failsafe back-up to avoid over inflation. Furthermore, inflation equipment of different pressures cannot be fitted to the wrong system since the couplings are not compatable.

    Vertform Manhole Shuttering

    Can Vertform only be used in concrete pipes?

    No – providing that the ID of the pipe is compatible with the Vertform sizes then the material that the pipe is manufactured from is not an issue.

    Do I have to specify the angle of direction changes within the manhole when I order Vertform?

    No – due to the unique design of Vertform, any angle up to a 90° bend can be achieved with the standard components in the Vertform set.

    Can Vertform cope with pipe diameter changes in the manhole?

    Yes – changes in pipe diameter can be achieved by using taper sets. You will need to specify if the changes are crown to crown (a.k.a. soffit to soffit ) or invert to invert. The tapers are manufactured from GRP for smaller sizes and can be straight or angled. For larger diameters or a manhole where there is a great change in pipe diameter, special timber tapers can be used in conjunction with the Vertform set.

    Can Vertform be used if there are side connections?

    Yes. If the connecting pipe is small in diameter (150mm – 300mm) then there are ball connectors available that fix to the outside of the Vertform to hold the side connection pipe in place. For larger diameter side connections there are side connection kits in GRP. These can be at invert level or soffit level.

    Do I have to use special concrete?

    No, use normal concrete unless otherwise specified, in normal conditions 50 slump with 20mm aggregate. No granolithic benching is required.  For smaller Vertform sizes (up to 600mm) a 1½”poker should be sufficient, for larger sets a 2” poker.

    Are any special tools required?

    No, all the required spanners are included in the Vertform set. The only hand tools required are a steel tape, a level, a hand saw and a hammer for fixing the infill panels.

    Can Vertform still be used if the chamber ring is larger or smaller than standard?

    Yes. For larger diameter chamber ring sizes some additional straight sections will be required – these should be requested when placing an order. For smaller diameter chamber rings care must be taken where a significant direction change is required (i.e. for angles above 70°). It may be necessary to use the stop end method (see the next question).

    Can I use Vertform for the first manhole on a pipe line (a single pipe)?

    Yes – the Vertform can be fitted to the single pipe and cantilevered out. A stop end U board made from ply wood is fixed onto the section of Vertform to close off the end of the shutter. If there is an inlet pipe, this can be butted up against the U board. Care must be taken when placing concrete to avoid any uplift of the shutter.

    How do I create toe holds?

    Preformed injection moulded toe holds can be fixed to the outside of the Vertform. They are held in place with special fixing tools. The toe holds are made from bright yellow polypropylene plastic and are self-cleaning and have a chevron-style grip.

    Can I create a rebate for double step irons?

    Yes, there is a double step box former that can be attached to the side of the Vertform. This can be taken to half section, or down to 175mm above invert level for larger diameter pipes.

    What should I do regarding access if the manhole is very shallow?

    There is a Box out Frame that can be hung over the side of the Vertform. This frame enables you to attach your own timber shuttering  to create a walkway from the chamber ring to the channel. This means that a worker will be able to stand in a shallow manhole.

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