ANSI/API Std 560: 2007 Fired Heaters for General Refinery Service (Eng)

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Annex C

(informative)

Proposed shop-assembly conditions

SHOP-ASSEMBLY

CONDITIONS

SERVICE ___________________________

UNIT ___________________________

TYPE ___________________________

OWNER ___________________________

PURCHASER ________________________

VENDOR ___________________________

DATE ___________________________

EQUIPMENT NO. _________________

PLANT LOCATION _________________

NO. REQUIRED _________________

REFERENCE NO. _________________

PAGE 1 OF _________________

DEGREE OF ASSEMBLY

Complete assembly (Number of sections) Radiant Convection

Boxes:

1. Refractory only __________________________ __________________________

2. With anchors only __________________________ __________________________

Panels:

3. With tubes and refractory installed __________________________ __________________________

4. With refractory only __________________________ __________________________

5. With anchors only __________________________ __________________________

Coils:

6. Number of coil assemblies __________________________ __________________________

7. Number of hairpins, canes, tubes __________________________ __________________________

8. Field welds, number/size __________________________ __________________________

Lined Unlined

Number of pieces: With anchors Without anchors

9. Breeching _____________________ ___________________________ _____________________

10. Flue-gas ducts _____________________ ___________________________ _____________________

11. Combustion air ducts _____________________ ___________________________ _____________________

12. Header boxes _____________________ ___________________________ _____________________

13. Plenum chamber _____________________ ___________________________ _____________________

14. Stack _____________________ ___________________________ _____________________

Installation: Shop-installed Field-installed

15. Tube supports

______________________ ______________________

16. Floor refractory

______________________ ______________________

17. Header boxes

______________________ ______________________

18. Plenum chambers

______________________ ______________________

19. Bridgewall

______________________ ______________________

20. Dampers

______________________ ______________________

21. Cages to ladders

______________________ ______________________

22. Platform flooring to framing

______________________ ______________________

23. Platform support clips to casing

______________________ ______________________

24. Handrails, midrails and toeplates to posts

______________________ ______________________

25. Stair treads to stringers

______________________ ______________________

26. Doors

______________________ ______________________

27. Tube-skin thermocouples

______________________ ______________________

28. Internal coatings

______________________ ______________________

29. Burners

______________________ ______________________

30. Sootblowers

______________________ ______________________

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SHOP-ASSEMBLY

CONDITIONS

SERVICE ___________________________

UNIT ___________________________

TYPE ___________________________

OWNER ___________________________

PURCHASER ________________________

VENDOR ___________________________

DATE ___________________________

EQUIPMENT NO. _________________

PLANT LOCATION _________________

NO. REQUIRED _________________

REFERENCE NO. _________________

PAGE 2 OF _________________

DEGREE OF ASSEMBLY (continued)

Air heater:

31. _______________________________________________________________________________________________________

32. _______________________________________________________________________________________________________

33. _______________________________________________________________________________________________________

34. _______________________________________________________________________________________________________

35. _______________________________________________________________________________________________________

36. _______________________________________________________________________________________________________

37. _______________________________________________________________________________________________________

38. _______________________________________________________________________________________________________

39. _______________________________________________________________________________________________________

40. _______________________________________________________________________________________________________

Fans:

1. _______________________________________________________________________________________________________

2. _______________________________________________________________________________________________________

3. _______________________________________________________________________________________________________

Drivers:

4. _______________________________________________________________________________________________________

5. _______________________________________________________________________________________________________

6. _______________________________________________________________________________________________________

Other:

7. _______________________________________________________________________________________________________

8. _______________________________________________________________________________________________________

9. _______________________________________________________________________________________________________

ESTIMATED SHIPPING MASSES AND DIMENSIONS

10. Total heater mass, tonnes (long tons) ________________________________

11. Total ladders, stairs, platform mass, tonnes (long tons) ________________________________

12. Total stack mass, tonnes (long tons) ________________________________

13. Maximum radiant-section mass, tonnes (long tons) ________________________________

14. Maximum radiant-section dimensions, length × width × height, m (ft) ________________________________

15. Maximum convection-section mass, tonnes (long tons) ________________________________

16. Maximum convection-section dimensions, length × width × height, m (ft) ________________________________

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Annex D

(normative)

Stress curves for use in the design of tube-support elements

D.1 General

This annex provides stress curves that shall be used in the design of tube-support elements. The following stress

curves are provided:

a) one-third of the ultimate tensile strength;

b) two-thirds of the yield strength (0,2 % offset);

c) 50 % of the average stress required to produce 1 % creep in 10 000 h;

d) 50 % of the average stress required to produce rupture in 10 000 h.

Some of the stresses listed in items a) through d) were not available for carbon steel castings or plate or for

50Cr-50Ni-Nb castings. The stress curves were plotted from data gathered over normal design ranges. All of the

materials are suitable for application at lower temperatures.

D.2 Casting factor

For cast materials, the stresses shown in Figures D.1 through D.13 are actual stresses based on published data

accepted by the industry. A casting-factor multiplier of 0,8 shall be applied to the allowable stress value in the

calculation of the minimum thickness.

D.3 Minimum cross-sections

If good foundry practice or casting methods or tolerances require the use of a cross section heavier than that

based on the calculation specified in D.2 or the stress curves shown in Figures D.1 through D.13, the governing

thickness shall be specified.

D.4 Maximum design temperatures

The maximum design temperatures shown in Figures D.1 through D.13 are obtained from Table 10 and are based

on resistance to oxidation, except for the maximum design temperatures shown in Figures D.10 and D.12

(Types 309H and 310H plate), which are based on available stress data. The stress curves for some materials

extend beyond the maximum design temperature because of the materials’ possible use with high oxidation rates

at higher temperatures.

D.5 Corrosion resistance

ASTM A 560, grade 50Cr-50Ni-Nb material is generally selected for its resistance to vanadium attack; however,

its resistance diminishes at temperatures above 870 °C (1 600 °F).

D.6 Proprietary alloys

Many low-chromium alloys, alloy cast iron and high-chromium nickel alloys are proprietary. The allowable

stresses used for the design of castings that use these materials (that are not included in Table 10) shall,

therefore, be obtained from the supplier and shall be subject to the agreement of the purchaser.

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D.7 Stress curves

All the stress curves in Figures D.1 through D.13 are based on published data. Apparent anomalies in the shapes

of the curves reflect the actual data points used to construct the curves.

D.8 Data sources

Table D.1 lists the sources of the stress data presented in Figures D.1 through D.13.

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Table D.1 — Sources of data presented in Figures D.1 through D.13

Figure Material Curve Data source

D.1 Carbon steel castings Tensile strength SFSA Steel Castings Handbook

Yield strength SFSA Steel Castings Handbook

D.2 Carbon steel plate Tensile strength ASTM DS 11S1

Yield strength ASTM DS 11S1

D.3 21/4Cr-1Mo castings Tensile strength ASTM DS 6

Yield strength ASTM DS 6S2

Rupture stress ASTM DS 6S2

Creep stress ASTM DS 6S2

D.4 21/4Cr-1Mo plate Tensile strength ASTM DS 6S2

Yield strength ASTM DS 6S2

Rupture stress ASTM DS 6S2

Creep stress ASTM DS 6S2

D.5 5Cr-1/2Mo castings Tensile strength ASTM DS 6

Yield strength ASTM DS 58

Rupture stress ASTM DS 58

Creep stress ASTM DS 58

D.6 5Cr-1/2Mo plate Tensile strength ASTM DS 58

Yield strength ASTM DS 58

Rupture stress ASTM DS 58

Creep stress ASTM DS 58

D.7 19Cr-9Ni castings Tensile strength ASM Metals Handbook

Yield strength ASM Metals Handbook

Rupture stress ASM Metals Handbook

Creep stress ASM Metals Handbook

D.8 Type 304H plate Tensile strength ASTM DS 5S2

Yield strength ASTM DS 5S2

Rupture stress ASTM DS 5S2

Creep stress ASTM DS 5S2

D.9 25Cr-12Ni castings Tensile strength ASM Metals Handbook

Yield strength ASM Metals Handbook

Rupture stress ASM Metals Handbook

Creep stress ASM Metals Handbook

D.10 Type 309H plate Tensile strength ASTM DS 5

Yield strength ASTM DS 5

Rupture stress ASTM DS 5

Creep stress ASTM DS 5

D.11 25Cr-20Ni castings Tensile strength ASM Metals Handbook

Yield strength ASM Metals Handbook

Rupture stress ASM Metals Handbook

Creep stress ASM Metals Handbook

D.12 Type 310H plate Tensile strength ASTM DS 5

Yield strength ASTM DS 5

Rupture stress ASTM DS 5

Creep stress ASTM DS 5

D.13 50Cr-50Ni-Nb castings Rupture stress IN-657

Creep stress IN-657

See Bibliography.

Reference [44].

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Key

X temperature, expressed in degrees Celsius (degrees Fahrenheit)

Y stress, expressed in megapascals (pounds per square inch × 1 000)

1 1/3 tensile strength

2 2/3 yield strength

3 maximum design temperature

Figure D.1 — Carbon steel castings: ASTM A 216, grade WCB

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Key

X temperature, expressed in degrees Celsius (degrees Fahrenheit)

Y stress, expressed in megapascals (pounds per square inch × 1 000)

1 1/3 tensile strength

2 2/3 yield strength

3 maximum design temperature

Figure D.2 — Carbon steel plate: ASTM A 283, grade C

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Key

X temperature, expressed in degrees Celsius (degrees Fahrenheit)

Y stress, expressed in megapascals (pounds per square inch × 1 000)

1 2/3 yield strength

2 1/3 tensile strength

3 50 % of rupture in 10 000 h

4 50 % of 1 % creep in 10 000 h

5 maximum design temperature

Figure D.3 — 2 1/4Cr-1Mo castings: ASTM A 217, grade WC9

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Key

X temperature, expressed in degrees Celsius (degrees Fahrenheit)

Y stress, expressed in megapascals (pounds per square inch × 1 000)

1 2/3 yield strength

2 1/3 tensile strength

3 50 % of rupture in 10 000 h

4 50 % of 1 % creep in 10 000 h

5 maximum design temperature

Figure D.4 — 2 1/4Cr-1Mo plate: ASTM A 387, Grade 22, Class 1

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Key

X temperature, expressed in degrees Celsius (degrees Fahrenheit)

Y stress, expressed in megapascals (pounds per square inch × 1 000)

1 2/3 yield strength

2 1/3 tensile strength

3 50 % of rupture in 10 000 h

4 50 % of 1 % creep in 10 000 h

5 maximum design temperature

Figure D.5 — 5Cr-1/2Mo castings: ASTM A 217, grade C5

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