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Nomograph 1 | Thermo Sensors

The Nomograph and Table 4 below may be applied in calculating wall thickness. The following example demonstrates the use of the nomograph in a typical problem situation.

Problem: To find maximum operating pressure of a thermowell, 304 stainless steel material, with a .385 inch bore and .750 minimum outside diameter whose maximum operating temperature will be 700°F.

Solution: Maximum allowable stress (Table 4) 10,500 PSI.Wall thickness (Min.) = .182.

A) Align 10,500 on right scale with .182 on wall thickness scale and mark intersection on pivot line.

B) Align pivot point intersection with correct outside diameter.

C) Read maximum pressure on left scale (5100 PSIG).

Table 4 – Allowable Stress Values (PSI)1

Material Temperature °F
0 300 500 700 900 1100 1300

Aluminum (1100)

Aluminum (6061-T6)

Nickel

Steel2

304 S. Stl.

316 S. Stl.

310 S. StI .

321 – 347 S. Stl.

410 S. StI .

446 S. Stl.

A182-F11

A182-F22

Copper

Admiralty Brass

Monel 400

Inconel 600

Incoloy 8003

Hastelloy B4

Hastelloy X5

2,350

6,000

10,000

11,250 

18,750

18,750

18,750

18,750

15,000

17,500

16,150

17,500

6,000

10,000

16,600

20,000

15,600

25,000 

23,350 

1,850

5,000

10,000

11,000 

13,750

16,400

14,600

15,300

13,800

16,100

16,150

17,500

5,000

10,000

13,600

18,800

12,100

24,750 

18,850 

–

–

9,500

10,250 

11,400

15,500

12,600

13,500

12,850

15,000

16,150

17,500

–

–

13,100

18,500

10,400

21,450 

16,000 

–

–

–

9,000 

10,500

15,100

11,300

12,200

12,050

–

16,150

17,500

–

–

13,100

18,500

9,600

– 

15,500 

–

–

–

7,750 

10,000

11,650

10,300

11,300

9,650

–

13,100

14,000

–

–

8,000

16,000

9,100

– 

15,500 

–

–

–

6,500 

8,250

8,500

9,450

9,100

2,900

–

4,000

4,200

–

–

–

3,000

8,800

– 

15,500 

–

–

–

– 

3,400

3,500

4,000

2,200

–

–

–

–

–

–

–

–

4,150

– 

9,500 
  1. Values from ASME Boiler and Pressure Vessel Code Section VlIl – Unfired Pressure Vessels,1965.
  2. ASME Spec. Min. Tensile = 45,000 PSI
  3. ASME Code (See Note 1), Case 1325 (special ruling)
  4. ASME Code (See Note 1), Case 1323 (special ruling)
  5. ASME Code (See Note 1), Case 1321 (special ruling)
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