Hi does anyone know where to find aluminum irrigation tubing preferably around 100-150mm in 6m lengths? TIA

Do you mean the type that has the windows which open/close to put water down between planted rows? If this is what you mean, No, and I have inquired with no luck. Siphon tubes out of a elevated water source may be doable, as a alternative.

Nah just generic tube will do thanks.

Have never seen aluminum pipe in Thailand.

In the US we use 3" and 4" in 30 foot lengths.

Connection fittings are press fitted

The idea is ripe for introduction to Thailand,

as movable hand lines would be a nice improvement

The San Joaquin Valley in California is an ag supply district

which would have everything possibly ever needed for any crop

Fresno and Bakersfield are the key city centers

The next best thing already available in Thailand is PVC in 4 meter lengths

It comes in three grades, 5.0, 8.5, and 13.5 bar pressure rated

For sprinkler irrigation, I've used 5.0 bar pipe with fine results.

Some farmers use Threaded steel pipe for surface lines which they remove between crops.

Seems a lot of work when they could trench and bury PVC