Document zz2ERmV8Le61R4w3jnge3OrKB

K "R-14" Large Turbine Erection & Test 'Mr. J. I. Jones oa re January 5, 1962 tutJCCT Insulating Block The following Is a list of suppliers and trade names of materials 7308 and 7309-1. ' Material Supplier Trade Name 7308 Baldwin-Ehret-Hlll Johns-Manville Owens-Coming Philip Carey Ruberoid Thennasil Thermobestos Kaylo Carey-Temp. -- M vv* [ Calsilite 7309-1 Johns-Manville Superex-M Keasbey & Mattlson K & M Hy-Temp. Owens-Coming . Kaylo-20 Philip Carey Carey Hi-Temp. 19 Baldwin-Ehret-Hill > . * *f* Enduro Hi-Temp. The main difference between these two materials'is that the 7308 is a better insulator than 7309-1, but does not have as .high a temperature limit (1200 vs 1600). Since we have present application for 7309-1 (gas turbine combustors operate at over 1200) and eventually steam-turbines will go over 1200; we can't depend on using 7308 exclusively. Also, since we use two layer Insulation for anything over 600, we use the 7309-1 to take the Initial heat shock and the 7308 (because It's a better insulator) on the outer layer. I am also attaching the latest standard book pages on insulation, which you might find useful. Steam Division - Standards Engrg, df "i Attachment Processes M. Dorfman 600096