Professional Practice and Engineering Ethics
Professional practice tests judgement as much as knowledge. As a registered public utility engineer (暖通空调) you seal drawings, carry design responsibility, and must refuse instructions that breach mandatory provisions - even when the client is paying.
Scope, seals and responsibility
- The practising seal applies to work you prepared or directly supervised and checked; sealing a drawing you have not reviewed is a disciplinary matter, not a formality.
- Mandatory provisions (强制性条文) in GB 55015, GB 50016, GB 51251 and GB 50736 cannot be waived by client instruction, value engineering, or a verbal site agreement.
- A registered engineer may not be registered with two employers at once; changes of practice must be notified to the registration authority.
Conduct
- Conflict of interest: disclose financial interests in suppliers or contractors and withdraw from selection decisions.
- Confidentiality: client data, tender prices and proprietary process information are not for reuse.
- Safety override: if you learn a built system is unsafe - undersized smoke exhaust, capped relief valve - report in writing and escalate.
- Records: minutes, calculation files, review comments and site instructions form your defence years later.
Worked example
A developer asks you to cut outdoor air in a shopping mall to 60% of the code minimum to reduce chiller capacity. The options are comply, negotiate, or refuse. The correct route is to explain that the minimum outdoor air rate is a mandatory provision tied to indoor air quality, offer a lower-cost alternative (heat recovery, demand-controlled ventilation within the permitted range), and record the request and your refusal in writing. Signing the reduced design exposes you to loss of registration and to liability if occupants are affected; silence makes you complicit.
Traps
Signing drawings prepared by an unqualified subcontractor; accepting a no-cost upgrade from a supplier whose equipment you then specify exclusively; treating a client email as authority to vary a code minimum; failing to record verbal site instructions; assuming the contractor's commissioning report discharges your design responsibility.