1)For 24" line, 1200 kpag pressure, connected to API 650 Tank with 200 mm settlement, I am using universal expansion joint.
The exp. joint take cares of settlement, but is their any issue of cyclic condition on bellow leading to fatigue.
Exp joint vendor specifies 2000 cycles only.

Is expansion joint in tank farm area a common practice?

2)For line size 2" to 4" and 1200 kpa connected to same tank, can hose be used? Any problem on durability of hose.

Thanks in advance,
Rocky