BS 853-2:1996

Committees responsible
Foreword
1 Scope
2 References
3 Definitions
4 Information and requirements to be agreed and to
     be documented
5 Materials
6 Welding procedure and welder approval tests
7 Design pressure and design temperature
8 Scantling design
9 Tubes
10 Construction
11 Pressure relief devices
12 Inspection and testing
13 Marking
14 Test certificates
Annexes
A (informative) Typical heat exchanger data sheet
B (informative) Typical fouling resistance values
C (informative) Typical flange design procedure:
     work sheet
Tables
1 Materials for the construction of heat exchangers
     (with design stress values f)
2 Bolting materials
3 Filler and brazing materials
4 Forgings and hot pressing stock
5 Number of test specimens required for procedure
     approval for copper
6 Number of test specimens required for welder
     approval for copper
7 Effective gasket width
8 Gasket materials and contact facings: gasket
     factor (s) for operating conditions and minimum
     design seating stress (y)
     Reliability factor (Fr) for joint types
10 Preferred tube sizes and thicknesses for branch
     pipes
11 Minimum length of thread
12 Preferred tube diameter and nominal thicknesses for
     heat exchange tubes
13 Maximum unsupported length of straight tubes
14 Minimum transverse baffle or support plate
     thickness
15 Minimum number and diameter of tie rods
Figures
1 Welder's history sheet
2 Double full fillet lap joint
3 Single full fillet lap joint with plug weld
4 Typical blind flange with gasket within the bolt
     circle reference
5 Welds for unflanged endplates
6 Location of gasket load reaction
7 Values of Y
8 Maximum external pressure of tubes for different
     ratios of tc/d
9 Typical weld construction of tube to tubeplate
10 Typical section through tubeplate showing
     arrangement of grooved tube holes
11 Impingement baffles
List of references

Specifies requirements for the design, methods of construction and testing of tubular heat exchangers and storage vessels for cooling, heating and heat recovery associated with building and industrial services. Covers the following types of heat exchangers: fixed tubeplate at each end; straight tubes with floating head at rear end (removable tube bundle); U-tubes (removable tube bundle).

This Part of BS 853 specifies requirements for the design, methods of construction and testing of tubular heat exchangers and storage vessels for heating, cooling and heat recovery associated with building and industrial services with limiting conditions of 2 N/mm2 design pressure, 300 °C maximum and 0 °C minimum temperature using such media as water, steam, thermal oils, glycol mixtures and oil. In addition to the definitive requirements, this standard also requires the items detailed in clause 4 to be documented. For compliance with this standard, both the definitive requirements and the documented items have to be satisfied. NOTE Attention is drawn to the dangers associated with heating flammable fluids above their flash points. Three types of heat exchangers are covered by this standard: fixed tubeplate at each end; U-tubes (removable tube bundle); straight tubes with floating head at rear end (removable tube bundle).