Document LppGQ4kZ7v6ZvXeOGyKX46m1g

TO}- 1C: IN.TJT.'-.TIOM ' ;. Mil . O r.ir.o i A cr-.pletc list of all insulation rcct'c<nls is beyond tho score of this rniy the rrir/ir-il r. on this plant will b" civ;- ' v ;'- d , 1. 8';'; magnesia r,23 br*-n for many Th" si.nr.iird molded insu lation for to-reraluros bttweer. Tf'-? anl 500". Although its properties have been varied r,omovV..i t di;r tnr; this tine, at present it is a fairly well stantardizci, product containing 85^3 hydrated basic magnesium carbonate, 20.' asbestos, 5>. clay or oth-. r binds. The rmeriaj is formed while i>ln:t:* union controlled flow and tres.-uiv condi- ionr, then cut to sire. The final product is available- ir. b.'o.V.s up to ! inches x 1? inches x 36 inches site, and os r-itc irrulation in sections 3 ,feet long and up to 3 inch's 'mck. For 12 inch pipe and over, the insulation is furnished in segments cut from U inch thick block. Tr.is material ia used largely on permanent pipe line instal lations because of the dust problem which is undesirable in production areas. Although Q^i magnesia is not as expensive as other insulating material^ it is not economical where easy removal and reinstallstion is necessary because of its lack of durability. 85?j magnesia shall not be used on stainless steel - if it gets wet, soluble chlorides ray lenoh out and concentrate on the surface of stainless steel causing stress corrosion cracking. It also shall not be used on aluminum because of corrosive effects. 8^- magnesia must be protected from, water and other liquids because of detrimental effect on bonding material and high water absorption properly. 2. Calcium Silicate (Calcilite, Kaylo) Calcium silicate is another molded insulant useful for tem peratures between 70F and 1200F. It is light weight material of a cellular fine clay base with good mechanical and insulating properties. Mol did blocks are available in sizes 36 inches lone by 6 inches wide and thicknesses up to 3 inches. Pipe coverings ore avail able in sections 3 fe*t long and with nominal thickne8oe3 of 1, 1j, ana 2 inches for standard pipe sizes up to 17 inches in /1 DUP 0900016 / f(:v- t