Reference profile
- Designation
- API 556
- Title
- Instrumentation, Control, and Protective Systems for Fired Heaters
- Issuing body
- API
- Current edition
- [verify]
- Status
- Library record: reviewed; official standard status [verify].
- Category
- Static Equipment
1
Overview
Guidance on instrumentation, control, and protective (safety) systems for fired heaters and steam generators.
2
Scope & Applicability
Covers
- Control systems
- Protective / trip logic
- Flame monitoring
- Fuel shutoff
- Alarms & interlocks
Does NOT cover (exclusions)
- Exclusions are not documented in this library record. Confirm the official publication, neighbouring codes, the adopted edition, and jurisdictional boundaries before application.
3
Key Requirements
Lifecycle requirements
- Heater safety system design
- BMS specification
- Interlock logic
4
Technical Details
Guidance on instrumentation, control, and protective (safety) systems for fired heaters and steam generators.
Components: BMS, Trip system, Flame scanner, Fuel shutoff.
Where to find it in the codeRefer to the official table of contents and the sections cited by the project specification; section numbering can vary by edition.
5
Engineering Notes
- Defines protective functions and trip logic that keep a fired heater within safe firing limits.
6
Related Standards
7
Source, Edition & Status
- Publisher
- API
- Edition Year
- N/A
- Industries
- Refinery, Petrochemical
- Content Status
- reviewed
- Last Reviewed
- 2026-07-01
- Last Updated
- 2026-07-01
- Verified By
- Engineering Reviewer
- Official Link
- N/A
This paraphrased summary is a discovery aid. Do not reproduce or substitute it for the copyrighted official publication or jurisdictional requirements.