GB/T 151-2026: Heat exchangers

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Scope

1.1 This document specifies the general requirements for metal heat exchangers. It also
specifies the requirements for materials, design, manufacture, inspection, acceptance,
installation, and use of shell-and-tube heat exchangers.
1.2 The general requirements of this document apply to shell-and-tube heat exchangers
and other types of heat exchangers. All contents of this document apply to shell-and-
tube heat exchangers.
1.3 The design pressure applicable to this document is.
a) The design pressure of shell-and-tube heat exchangers shall not exceed 35 MPa;
b) The design pressure of other types of heat exchangers shall be determined in
accordance with the relevant referenced product standards.
1.4 The design temperature applicable to this document is.
a) The design temperature range for steel heat exchangers shall be in accordance
with the allowable operating temperature range for materials listed in GB/T
150.2-2024;
b) The design temperature of non-ferrous metal heat exchangers shall be determined
according to the allowable operating temperature of the materials listed in the
relevant referenced standards.
1.5 This document applies to shell-and-tube heat exchangers where the product of the
design pressure (MPa) and nominal diameter (mm) is not greater than 4.05 × 10⁴. For
non-removable tube bundle shell-and-tube heat exchangers, the nominal diameter is not
greater than 6000 mm. For removable tube bundle shell-and-tube heat exchangers, the
nominal diameter is not greater than 2600 mm.
1.6 Shell-and-tube heat exchangers exceeding the range of 1.5 shall be constructed in
accordance with this document.
1.7 This document does not apply to the following heat exchangers.
a) Heat exchangers heated by direct flame;
b) Flue-type waste heat boilers;
c) Heat exchangers in nuclear power plants that pose a risk of failure due to neutron
radiation damage;
d) Non-metallic heat exchangers;
e) Heat exchangers for which there are separate national or industry standards in the
refrigeration and air conditioning industry.
1.8 The scope of heat exchangers is defined as follows.
a) Heat exchanger connection to external tubing.
1) The first bevel face of a welded joint;
2) The first threaded joint face of a threaded joint;
3) The first flange sealing face of a flange joint;
4) The first sealing face of a special connector or fitting connection.
b) Pressure-bearing heads, flat covers, and their fasteners for tubes, manholes,
handholes, etc.
c) Welds connecting non-pressure-bearing components to pressure-bearing
components.
d) Non-pressure-bearing components directly connected to the heat exchanger, such
as supports and gaskets.
e) Overpressure relief devices installed on the heat exchanger.

Basic Data