Sinking air line calculation

[Derbs]

Does anyone have a calculation in regards to how much a 1' piece of plastic hose needs to weigh in order to sink, in water, while air is being pumped through it. We know the ID of the hose and the specific gravity of the thermoplastic. The customer does not want to attach weights to the hose, but, have the hose itself heavy enough to sink.

 

[GrahamBennett]

Steel drums, ships, etc all float and all have SGs greater than 1. Weights are probably the only answer.

 

[tom1953]

I'd think you'd have to calculate the specific gravity of the hose WITH the air in it, not just the SG of the hose material. So if the hose has a gravity of 1.2, for example, but the interior area of the ID of the hose is 50% of the area of the cross-section, your effective SG might only be 0.6 (I'm sure it's not just an average, but I don't know the calculation off hand).
So, in this case, you might have to have a hose with a SG of 2+ in order to sink while filled with air.
tom