As our commissioning system, which are composed of piping,  reach the point of being hydro tested (proof of pipe and weld integrity), we must consider when we need the insulation (if called for on the P&ID), can be installed.

It is normal for the commissioning team to ask construction NOT to insulate all flanges as there is a risk that should that joint leak during the leak-test, we would damage the insulation, hence, typically insulation of joints will become a “reservation to handover” on the transition document capturing the transfer of care, custody and control from construction to commissioning. The insulation should then be applied as soon as it is practical after the commissioning leak test has been passed.

So are there instances where insulation may be applied even at the risk of damage?

These instances can be evaluated on a case by case basis, however good examples where perhaps safety implications are relevant (commissioning of steam systems), other examples may be heating and ventilation system pipework perhaps in a ceiling void, but in this instance consideration may be given to insulating the pipe but leaving the actual tile out beneath the actual flange?

This is by no means an exhaustive list, but considerations we should make in insulating our pipework.

Safe and successful commissioning always…