GB/T 46150.1-2025Boilers and pressure vessels - Part 1: Performance requirements (English PDF)

3.1 Certification

Third-party attestation related to the object of conformity assessment; accreditation is excluded.

[Source. ISO/IEC 17000.2020, 7.6]

3.2 Conformity

In compliance with specified requirements.

3.3 Contracting Party

The individual or organization that purchases the boiler or pressure vessel for the user.

3.4 Designer

An organization that designs boilers or pressure vessels in accordance with standards.

3.5 Examination

The activity in which qualified personnel assess—in accordance with standard procedures— whether a given product, process, or service complies with specified acceptance criteria.

3.6 Inspection

The activity of verifying whether the results of required examinations, checks, and testing comply with specified requirements.

3.7 Manufacturer

An independent legal entity that manufactures (including installation) boilers or pressure vessels in accordance with the following requirements.

--- Users Design Specification (UDS) provided by the contracting party or user;

--- Requirements of applicable construction standards for boilers and pressure vessels.

3.8 Qualification

The demonstration of the suitability of a specific person, method, procedure, or service in meeting specified requirements.

3.9 Regulation

Rules issued by government agencies in accordance with the law.

NOTE. Such as safety technical specifications.

3.10 Safety Accessory

A device used to protect a boiler or pressure vessel by preventing operating parameters from exceeding permissible limits.

NOTE. These devices may be used directly on boilers and pressure vessels, including. safety valves, bursting disc safety/buckling pins, and controlled safety pressure relief systems; limiting devices that can activate corrective measures or provide shutdown or lockout functions (e.g., pressure switches, temperature switches, or liquid level switches); and safety-related measuring, control, and regulating devices.

3.11 Standard/Code

A document established by a standardization body—through a process of drafting and approval—that prescribes common and repeated rules, guidelines, or characteristics for activities or their results.

3.12 Testing

The activity of verifying, through a specific procedure, whether one or more characteristics of a product, process, or service meet specified requirements.

3.13 Third-Party Inspection Body/Supervision Inspection Agency

An organization that conducts inspections of boilers or pressure vessels in accordance with regulations and standards, and which operates independently of the manufacturer, contracting party, or user.

3.14 User

The organization or individual that uses or operates a boiler or pressure vessel.

6.1 General Requirements

The obligations and responsibilities of the user, contracting party, designer, manufacturer, and supervision inspection agency (third-party inspection body) shall be clearly defined; general responsibilities for each party are outlined in 6.2 to 6.4.

6.2 User and Contracting Party

The user and the contracting party shall fulfill the following responsibilities.

a) The contracting party or user shall provide the Users Design Specification (UDS) for the boiler or pressure vessel to the designer in writing. The contracting party or user shall consider all factors related to usage when preparing the UDS. The UDS shall include, at a minimum, the following key information.

1) Standards and codes serving as the basis for construction;

2) The installation site and its natural conditions (including seismic design intensity, wind and snow loads, ambient temperature, etc.) for the boiler or pressure vessel;

3) The structure, key geometric parameters, and nozzle specifications of the boiler or pressure vessel;

4) Design parameters (design pressure, design temperature, etc.), operating parameters (operating pressure, operating temperature, cyclic loading conditions, liquid level height, nozzle loads, etc.), and environmental requirements;

5) Composition and characteristics of the medium;

6) Intended service life;

7) Overpressure risks and reasons during the operation of the boiler or pressure vessel, and the overpressure relief devices to be considered;

8) Other necessary conditions required for the design.

b) Before the initial operation of a boiler or pressure vessel, the user shall verify that the overpressure relief device (if applicable) has been correctly installed in the designated position.

6.3 Designer

The designer shall fulfill the following responsibilities.

a) Be responsible for the accuracy and completeness of the design documents;

b) Provide design documents to the contracting party;

c) Issue a risk assessment report to the user where necessary;

d) Retain all design documents for the duration of the boiler or pressure vessel’s design service life.

6.4 Manufacturer

The manufacturer shall fulfill the following responsibilities.

a) The manufacturer shall carry out manufacturing in accordance with the requirements of the design documents; if modifications to the design are necessary, the manufacturer shall obtain written consent to the modification from the original

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