Watlow Heater Catalog

Reference Data

Tubular Elements and Assembly Selection Guide

Supplemental Applications Chart (Continued)

WATROD Element

FIREBAR Element

Max.

Max. Watt

Max. Watt

Operating

Heated Material

Temperature

Density

Sheath Material

Density

Sheath Material

°F

(°C)

W/in 2 (W/cm 2 )

W/in 2

(W/cm 2 )

Gelatin liquid Gelatin solid

150 150 500 212

(65) (65)

23

(3.6) (0.8) (1.6) (3.6) (3.6) (0.8) (2.5)

304 SS 304 SS Alloy 800 Alloy 800

30

(4.6) (1.0) (1.9) (4.6) (4.6) (1.0) (3.1)

304 SS 304 SS 304 SS 304 SS 304 SS 304 SS 304 SS Alloy 800

5

7

Glycerin Glycerol Grease: Liquid

(260) (100)

10 23

12 30

— —

— —

23

Steel Steel

30

Solid

5

7

Hydrazine Hydrogen

212

(100)

16 — — — 40 40 40 — 20 20

304 SS Alloy 800 Alloy 600

20

— — —

a

a

a

a

Hydrogen chloride Hydrogen sulfide

N/A

a

a

a

a

316 SS (heavy wall)

a

a

N/A

a

a

Magnesium chloride Magnesium sulfate Magnesium sulfate

212 212 212 180 180 100 a

(100) (100) (100)

(6.2) (6.2) (6.2)

Alloy 600

40 40 40

(6.2) (6.2) (6.2)

Alloy 800 304 SS 304 SS 304 SS 304 SS

304 SS 316 SS 304 SS

Methanol gas Methylamine Methychloride

—

a

a

a

(82) (82) (37)

(3.1) (3.1)

Alloy 600 Alloy 800

30

(4.6) N/A

N/A 5-8 N/A

N/A

Molasses

4-5 (0.6 - 0.8)

304 SS

(0.8 - 1.2)

304 SS

Molten salt bath

800-900 (426-482) 25-30 (3.8 - 4.6)

Alloy 400

N/A (2.5)

N/A

Naphtha

212

(100)

10

(1.6)

Steel

16

304 SS

Oils Fuel oils: Grades 1 and 2 (distillate) Grades 4 and 5 (residual)

200

(93)

23

(3.6)

Steel

30

(4.6)

304 SS

200

(93)

13

(2.0)

Steel

16

(2.5)

304 SS

Grades 6 and Bunker C (residual)

160

(71)

8

(1.2)

Steel

10

(1.6)

304 SS

Heat transfer oils: b Static

500 600 500 600

(260) (315) (260) (315)

16 10 23 15

(2.5) (1.6) (3.6) (2.3)

Steel Steel Steel Steel

23 16 30 20

(3.6) (2.5) (4.6) (3.1)

304 SS 304 SS 304 SS 304 SS

Circulating

Lubrication oils: SAE 10, 90-100 SSU @ 130°F SAE 20, 120-185 SSU @ 130°F SAE 30, 185-255 SSU @ 130°F SAE 40, -80 SSU @ 210°F SAE 50, 80-105 SSU @ 210°F

250

(121)

23

(3.6)

Steel

30

(4.6)

304 SS

250

(121)

23

(3.6)

Steel

30

(4.6)

304 SS

250

(121)

23

(3.6)

Steel

30

(4.6)

304 SS

250

(121)

13

(2.0)

Steel

18

(2.7)

304 SS

250

(121)

13

(2.0)

Steel

18

(2.7)

304 SS

CONTINUED

a Contact your Watlow representative. b Maximum operating temperatures and watt densities are detailed in Heat Transfer Oil charts on page 555.

547