Guild Wars 2

Does the Shrapnel trait count for turrets when you force blow up or when you have them traited to blow up on death?

Yes to both of these. Detonating your turret is considered an explosion, so it benefits from any of your traits that affect explosions. (Shrapnel, Steel-Packed Powder, Explosive Powder, etc.)
When your turret is destroyed and you have Accelerant Packed Turrets traited, nearby enemies are pushed back in addition to the above effects. This is true whether you detonate the turrets or they are killed.

(Accelerant-Packed Turrets basically just makes them use Detonate X Turret when they’re killed.)

Does the turrets knock back on death trait effect supply kit turrets aswell?

Awesome. Thanks. ^^

@ ukuni

Yes

Ive noticed some inconsistencies with turrets exploding, alot of the time hte push back is not consistent when I detonate, also when they die too. It makes me wonder if the other effects are not consistent too. Also I have not really witnesses the pushback on someone killing the turrets. Ald also does this count for the turrets in supply crate (boy I wish we could detonate those…)

You can’t manually detonate turrets from supply crate but they do push back when they are destroyed.