Rank: Forum user 
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We have a client with a 12x25m inflatable football pitch that is 4m high. The pitch has 6 x inflatable arches and two horizontal tubes going right around it with net infills. Each of the 6 arches has two anchor points, 24 in total. Does anyone know if there is a calculation or anchor table for inflatables?
Lloydy
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Rank: Super forum user 
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Is this information not included in the installation instructions - if not go back to the supplier/manufacturer. In the light of recent incidents involving inflatables I would imagine the correct anchoring is critical to its safety. Jeepers though thats some size Eh!
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Rank: Forum user
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It came from China, no instructions! We have contacted them but no reply! As far as the size goes, you shouldn't be looking, avert your eyes.
Do you know of any calculation we can use?
Thanks Lloydy
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Rank: Super forum user
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I would have thought that the anchor requirements will depend on the ground conditions.
Obviously the wind speed & direction as well.
Not aware of any direct calculations - other than using the wind speed to estimate the force on the inflatable. You would also need to work out the surface area of the inflatable facing this wind. But this could be a little variable, as it probably moves in the wind.
Maybe a practical route could be to speak/get advice from a company that deals with out door events and erects/uses large marque type tents? I would assume they have similar problems with wind!!
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Rank: Super forum user 
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I think you want MUTA at http://www.performancetextiles.org.uk/Default.aspx ("MUTA, the trade association for the UK temporary structures and technical textiles industries represents suppliers and manufacturers of textile products in sectors as diverse as marquees, healthcare, aerospace, sport and bouncy castles.") On their publications page they have a document "Guidance for the Design, Procurement & Use of Inflatable Temporary Structures". It seems it is free if you register on the site. I haven't read their stuff about inflatables, but I note that the Institution of Structural Engineers book "Temporary demountable structures, Guidance on procurement, design and use" refers to MUTA guidance with respect to marquees as 'the PTA method', and a 'large marquee' is "pole marquees with a span greater than 12m (40ft) or framed marquees with a span greater than 9m." It goes on to say "Large marquees should be designed to remain stable for the design wind loading predicted by the Code/Standard relevant at the time of design" and quotes BSs. That is to say, anything as big as you are talking seems to require actual wind load calculations, rather than a simple lookup in a table of rules-of-thumb.
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Rank: Forum user
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You need to get some calcs done by a chartered Engineer.
And then have them 3rd party checked by another one!!
In light of recent events with inflatables (google brouhaha inflatable)
it will be money well spent. They will take into account the area of the country, and apply worse case, then a factor of safety.
Phil
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Rank: Super forum user
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Rank: Guest
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I know its Friday but I honestly thought the thread was about inflatable dinghies having anchors!
Doubt they would get very far!
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Rank: Forum user
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Thanks for your help everyone, on-wards and up-wards.
Lloydy
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Rank: Forum user
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Or hopefully not - considering the subject is the anchoring of inflatables
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Rank: Forum user
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It's the way I tell um, so it is!
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