Anti-Sweat Insulation

Can you give us more detail? What is the temperature of the water inside the pipe, and what size is the pipe? What are the temperature and relative humidity of the space through which this insulated pipe will be installed? Proper calculation of insulation thickness should prevent the outer surface from sweating.

Is this about pipe leakage, in which case a pressure-test following installation will be sufficient, or is it about condensation on the pipes, in which case insulation may be the solution?

It seems to be pressure related question instead of insulation related question.

Provided that potable water is clean and not hot to injure people, my answer is like this.

You are presuming that leakage is abvious. To a certain extend, yes it is rational.

But before you insulate the piping, definately you shall test the piping hydrostatically. It means there no leakage is ensured. Then only you will do the insulation of piping.

It is too early to worry about such leakage.

By any reason, if there is leakage, you can only recognize there is leakage after such leakage drop out of insulation cover.

For such case, nothing happen except for water drop, just check the leaking points and do remedy as needed as proper, by welding or replacing the piping and so on.

Drain? the first thing when the leakage detected is to block the piping system to prevent any further leakage and peel off adjacent insulation cover and materials. So, drain is naturally completed by this.

Imagin that you need to replace the pipe, what can be remained in the piping when you disassemble the existing leaking piping?

Use perlite Insulation which is a water repellant Insulation material and it can withstand from 27 to 649 deg c if the operating temperature fell in between this category.

Second if it is less than the above criteria then u can go for a fibre glass blanket with vapor retarder outside and with an Self -Adhesive tape at the joints .

In case if you want to detect the leak then u can provide a drain hole of 10 mm in dia at the bottom of the metal jacketing . use a polysurlyn (Fatory applied moisture barrier ) if it is a aluminium metal jacketing .

In case if it is outdoor then go for a SS Cladding to minimize the corrosion as ur project is near by coastal location.

Hope the above info will be helpful

Regards

Earnest.

and it must be routed through ceiling, airconditioning room.

Does this mean that it is used for air conditioning the room or that the room is already air conditioned and the water will be passing through it?

If it is intended to be used for hydronic cooling you will need a down sized air handler to keep the dew point under control, but use no insulation. I can recommend some systems if this is the case.

If this water is just passing through you will need to know the minimum water temps and assume your humidity is 100% to determine how much insulation to keep the pipes from sweating.

...or are you asking how to drain the airconditioning room in the event it gets flooded.

Draining the tank is simple enough if you install drain valves like a boiler drain.