Hello Tony
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In a past life when I was inspecting / asset collecting stormwater lines, circumferential cracks in the pipes just upstream and downstream of pits was common. Probably due to the pit being on more compact bedding than the pipes.
Based on the number of cracks, I would recommend the flexible joints, unless the developers can show a way where they will annually inspect the pipes for say 1 or 2 m from the pit / maintenance hole and replace any pipes with any cracking within 3 months of the inspection. The duration of the annual inspections is to be at least half the design life of the pipe system.
If the developers don't want to construct to your standards, then the developers can undertake the maintenance that you are designing out by having flexible joints.
Developer often tell me similar things, such as you don't need expansion joints in concrete slabs or the other Council's don't require full depth expansion, or some other detail that aids longevity buts takes a bit of extra effort during construction. I ask them if they are including maintenance in their price if they leave that out.
Thanks
Jim
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Original Message:Sent: 04 May 23:56From: Tony McGlynnSubject: Flexible joints outside manholes?
I am currently being questioned by a developer with regards to the requirement for flexible joints outside manholes.
PNCC's engineering standards require double flexible joints upstream and downstream for wastewater manholes and single flexible joints upstream and downstream for stormwater manholes.
If you want to learn more, please visit our website Fuxin Intelligent.
I have checked some standards from other LA's around NZ and there seems to be some inconsistency.
I would appreciate any feedback on what your requirements are?
Kind Regards
Tony
------------------------------------------------------------Tony McGlynnDevelopments Team LeaderPalmerston North City CouncilPalmerston North------------------------------
------------------------------JimTurnerTeam Leader Design ProjectsGORDON NSW
Flexible joints are vital components that are used in many different industries. Whenever there are two pipes that need to be joined together using components that are flexible and not as rigid as the other options, flexible joints have to be used. We have a wide range of flexible joints that you can buy and make use of in your business and industry. They&#;re crucial in any pipeline system and they can add an extra layer of protection and security to that system when they&#;re used in the right way. Flexible joints comes in all shapes and sizes, so you need to know a bit more about them.
Flexible joints are sometimes also known as unrestrained joints. This because they can be used in so many different ways and are much less confined in terms of their potential use than the alternative type of joints. Unrestrained pipes tend to be used with uniaxial pipes. These need pressure support and that&#;s what these joints provide, making them the ideal fit. The best flexible joints are also very easy to use and install, so they shouldn&#;t cause you any problems, even if you haven&#;t fitted one before.
It&#;s important to have components made from safe, secure and wear resistant materials when you&#;re running a business in the food industry. Our flexible joints are used by many such companies and that&#;s because they are strong enough to hold up under pressure. They&#;re also improved by food safety regulators too. It&#;s important to use joints that are up to the right standard and able to do what you need them to when it comes to managing foodstuffs safely. There are even different joints that can be matched to different food products, so survey all the options before making your final decision.
It&#;s not all about the food industry, though. There are plenty of other kinds of businesses and industries that we supply flexible joints to. For example, companies that work with harsh chemicals need strong and flexible joints that can withstand exposure to such chemicals. We provide silicone-free materials that can be used in the production of plastics. Our materials are also solvent resistant, which can be used at very high temperatures. On top of that, gas and oil can also be accommodated by our flexible joints, as can something as simple as water. A lot of bases are covered the flexible joints on offer.
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