Compressor inspection for NR-13 compliance is an essential process to ensure that equipment meets safety standards and operates efficiently in the workplace. Beyond regulatory compliance, inspections are critical for preventing and minimizing damage and risk, as well as preserving equipment and systems.
Compliance with Regulatory Standard NR-13 is mandatory for any industrial facility or other environment in Brazil that operates boilers, pressure vessels and piping. Conducting these inspections regularly is fundamental to ensuring worker safety and the quality of industrial processes.
Free Material
NR-13 Practical Guide
for Beginners
- NR-13 legal requirements explained
- Vessel and compressor categories
- Mandatory inspection intervals
Boilers
Maintenance contracts, safety inspections and non-destructive testing
Pressure Vessels
Maintenance contracts, safety inspections and non-destructive testing
Piping
Maintenance contracts, safety inspections and non-destructive testing
Tanks
Maintenance contracts, safety inspections and non-destructive testing
Equipment Record Compilation and Reconstitution
ES Engenharia offers compilation, classification, organization and pagination services for all technical documentation issued during equipment manufacturing and inspection or at project completion. We keep records generated during fabrication and assembly accessible and permanent, so clients can verify any issues inherent to fabrication and inspection of an item throughout its service life. In addition, compressor inspection for NR-13 compliance ensures that all valves and pressure gauges are functioning correctly, avoiding risks to workers.
Pressure gauge calibration is a critical step to ensure measurement accuracy in chemical and petrochemical industries, and is regulated by NR-13. Calibration must be performed regularly and pressure gauges must be certified by Inmetro to ensure they meet the required standards and regulations.
As a specialized company with extensive experience in the physical and digital compilation and assembly of Data Books, ES Engenharia carries out this process analytically, following applicable procedures, standards and contractual documents relating to the supply or project. We guarantee the quality and accuracy of the data included in the Data Book, ensuring compliance with applicable standards and regulations.
Complete Data Book: ES Engenharia offers comprehensive services
- Thorough analysis of technical documentation (material certificates, drawings, data sheets, procedures, reports, quality records, instrumentation and more)
- Precise formatting and structuring in accordance with the pre-established or normative standard
- Data Book digitization in PDF format with full searchable INDEX
- Execution of the compliance project
Pressure vessel and boiler categories under NR-13
NR-13 classifies boilers and pressure vessels into categories that determine the frequency and type of mandatory inspection. Knowing your equipment category is the first step toward compliance.
Boilers
| Category | Classification criterion |
|---|---|
| A | Operating pressure ≥ 19.6 bar (2 MPa) |
| B | Pressure between 5.88 bar and 19.6 bar (0.6 to 2 MPa) |
| C | Operating pressure ≤ 5.88 bar (0.6 MPa) |
Pressure Vessels
| Category | Criterion — P × V product (MPa·m³) |
|---|---|
| I | P × V ≤ 0.1 MPa·m³ (any fluid) |
| II | 0.1 < P × V ≤ 1.0 MPa·m³ |
| III | 1.0 < P × V ≤ 10.0 MPa·m³ |
| IV | P × V > 10.0 MPa·m³ or P > 2.5 MPa with hazardous fluids |
Inspection intervals for compressors and NR-13 equipment
Maximum intervals between inspections are defined by the equipment category and inspection type (internal or external). Non-compliance exposes the company to shutdown orders and fines from the Ministry of Labor.
Boilers
| Category | External (months) | Internal (months) |
|---|---|---|
| A | 12 | 24 |
| B | 18 | 36 |
| C | 30 | 60 |
Pressure Vessels
| Category | External (months) | Internal (months) |
|---|---|---|
| I | — | 120 |
| II | 30 | 60 |
| III | 24 | 48 |
| IV | 12 | 24 |
What must be included in the NR-13 Equipment Record
The equipment record is the central document for NR-13. It must be available for inspection at any time. Its absence or incompleteness is a serious violation.
- ✓ Equipment construction design (calculation report, drawings and technical specifications)
- ✓ Specifications and material certificates used in fabrication and repairs
- ✓ Written procedures for maintenance, repair and modification
- ✓ Records of all inspections performed — internal, external and extraordinary
- ✓ Calibration certificates for pressure gauges and safety relief valves (PSV) with Inmetro traceability
- ✓ ART of the qualified engineer responsible for safety inspections
- ✓ Complete history of repairs and modifications with dates and responsible engineers
Consequences of NR-13 non-compliance
Operating boilers and pressure vessels outside NR-13 compliance exposes the company to serious risks — legal, financial and human.
Immediate shutdown
The Ministry of Labor labor auditor can shut down the equipment and halt production on the spot during an inspection.
Ministry fines
Penalties from R$ 2,000 to R$ 100,000 per violation, with increases for repeat offenses.
Legal liability
The responsible engineer and employer face civil and criminal liability in the event of an accident with casualties.
Voided insurance
Accidents involving equipment without NR-13 compliance can void industrial insurance coverage.
Frequently Asked Questions
When is NR-13 compressor inspection mandatory? +
Inspection is required when the equipment falls under NR-13 scope and according to the deadlines and conditions for initial, periodic or extraordinary inspection. The scope depends on the equipment category and its operating conditions.
What is included in the service? +
Technical evaluation per NR-13, verification of safety devices (e.g. valves and pressure gauges), recommendations and issuance of a technical report. Where applicable, we provide guidance on documentation and equipment records.
Does the compressor need to be shut down? +
It depends on the type of inspection and access requirements. Part of the verification can be done with the equipment running; internal inspections and tests may require a planned shutdown.
What is the turnaround time and report delivery? +
The timeline varies with the complexity and number of equipment items. In general, we schedule quickly and deliver the report after inspection and analysis.
How do I request a quote? +
Contact ES Engenharia via WhatsApp at (27) 9.9798-8642 and provide the city, number of compressors and nameplate data (if available).
18 years inspecting critical equipment in refineries, petrochemical plants and industries across Brazil. Certified team: CREA · ABENDI · ASME · IRATA.
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