one day I'm fine and doing greatSuddenly, the next day I'm having trouble with constipationI know it's not a pleasant thing to ask but I was wondering how it suddenly happenI haven't changed my diet or anything or eaten or drank anything unusualI was fine then suddenly I'm not and I can't remember what I have changed to make this happen? I also noticed that I had a little bit of gas and I think that's what caused it but not sure what happened if I haven't changed anything.
Foamglass is OK as long as you are above the freezing pointI worked on one brine system which had old foamglass, and even though they claim it is impermeable, this stuff had been completely permeated, and had the insulating properties of frozen mud [which I looked up in Perry's and compared to the heat load at 'idle' and found a good match] However, I have seen plenty of other types of insulation used, from Cal-Sil to fiberglass to urethaneSelection criteria will involve materials and installation cost, the cost of an extra BTU getting into the chilled water, and durability questions.
I like the answer given by RedbeardMy experiences lead me to conclude that a resilient closed cell foam is better for high traffic areas, while a more rigid material will give better results where worker contact is unlikelyThe rigid material will initially provide higher performance, but the resilient material will recover from contact compression and thus continue to provide good performance longer after insulation.
I still like foamglass for cold systemsI have used it successfully down to -50 degs F and colderIt is better than fiberglass because of its resistance to collapseI have seen fiberglass sag very badly over time and lose its insulating abilityFoamglass is not permeable because the cells are closedProperly installed and sealed, foamglass is still a very good productUrethanes are also good but I do not have any current costs comparisons to foam glass.
You asked for the best cold service insulation - it would be a closed cell, foamed, pre-molded polyuerthaneNext best would be the same in polystyreneAll cold insulations are only as good their vapor barrier coveringsIn this regard , any closed - cell system is more forgiving of migration than any open cell or fiberous systemLight sheet metal lagging can provide protection in personnel traffic areas and out-of doors exposureDon't insulate the flanges until after the leakage tests have been made.
