Heater Catalog - Watlow

Reference DataTubular Elements and AssemblySelection GuideSupplemental Applications Chart (Continued)WATROD ElementFIREBAR ElementMax. Max. Max.Operating Watt WattHeated Material Temperature Density Sheath Material Density Sheath Material°F (°C) W/in 2 (W/cm 2 ) W/in 2 (W/cm 2 )Gelatin liquid 150 (65) 23 (3.6) 304 SS 30 (4.6) 304 SSGelatin solid 150 (65) 5 (0.8) 304 SS 7 (1.0) 304 SSGlycerin 500 (260) 10 (1.6) Alloy 800 12 (1.9) 304 SSGlycerol 212 (100) 23 (3.6) Alloy 800 30 (4.6) 304 SSGrease:Liquid — — 23 (3.6) Steel 30 (4.6) 304 SSSolid — — 5 (0.8) Steel 7 (1.0) 304 SSHydrazine 212 (100) 16 (2.5) 304 SS 20 (3.1) 304 SSHydrogen a a — — Alloy 800 a a Alloy 800Hydrogen chloride a a — — Alloy 600 a a N/AHydrogen sulfide a a — — 316 SS(heavy wall) a a N/AMagnesium chloride 212 (100) 40 (6.2) Alloy 600 40 (6.2) Alloy 800Magnesium sulfate 212 (100) 40 (6.2) 304 SS 40 (6.2) 304 SSMagnesium sulfate 212 (100) 40 (6.2) 316 SS 40 (6.2) 304 SSMethanol gas a a — — 304 SS a a 304 SSMethylamine 180 (82) 20 (3.1) Alloy 600 30 (4.6) 304 SSMethychloride 180 (82) 20 (3.1) Alloy 800 N/A N/A N/AMolasses 100 (37) 4-5 (0.6 - 0.8) 304 SS 5-8 (0.8 - 1.2) 304 SSMolten salt bath 800-900 (426-482) 25-30 (3.8 - 4.6) Alloy 400 N/A N/A N/ANaphtha 212 (100) 10 (1.6) Steel 16 (2.5) 304 SSOilsFuel oils:Grades 1 and 2(distillate) 200 (93) 23 (3.6) Steel 30 (4.6) 304 SSGrades 4 and 5(residual) 200 (93) 13 (2.0) Steel 16 (2.5) 304 SSGrades 6 and Bunker C(residual) 160 (71) 8 (1.2) Steel 10 (1.6) 304 SSHeat transfer oils: bStatic 500 (260) 16 (2.5) Steel 23 (3.6) 304 SS600 (315) 10 (1.6) Steel 16 (2.5) 304 SSCirculating 500 (260) 23 (3.6) Steel 30 (4.6) 304 SS600 (315) 15 (2.3) Steel 20 (3.1) 304 SSLubrication oils:SAE 10, 90-100SSU @ 130°F 250 (121) 23 (3.6) Steel 30 (4.6) 304 SSSAE 20, 120-185SSU @ 130°F 250 (121) 23 (3.6) Steel 30 (4.6) 304 SSSAE 30, 185-255SSU @ 130°F 250 (121) 23 (3.6) Steel 30 (4.6) 304 SSSAE 40, -80SSU @ 210°F 250 (121) 13 (2.0) Steel 18 (2.7) 304 SSSAE 50, 80-105SSU @ 210°F 250 (121) 13 (2.0) Steel 18 (2.7) 304 SSa Contact your Watlow representative.b Maximum operating temperatures and watt densities are detailed in Heat Transfer Oil charts on page 560.CONTINUEDWATLOW ®557