Attachment to tanks after hydrostatic testing

[octane]

We have conducted hydrostatic testing at our tank and now for insulation / cladding sheets hook up, we need to attach small attachments with welding.
Is that allowable as per code? Or do we need to conduct hydrostatic testing again?

[arcpro]

As per API 650 you can weld the non-structural attachments to the tank even after hydrostatic testing.
Your case also appears to be the same. No re-hydro required.

[octane]

Thanks.
In which clause this has been mentioned?

[arcpro]

Look in sec. 5.3.5 API 650 (2003 edition)

[octane]

Thanks...
I found that.