Download NR13 Brazilian Pressure Vessel Code in English PDF

TitleNR13 Brazilian Pressure Vessel Code in English
TagsBoiler Heat Exchanger Heat Steam
File Size57.9 KB
Total Pages16
Document Text Contents
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NR-13 BOILERS AND PRESSURE VESSELS

13.1. STEAM BOILERS - GENERAL

13.1.1. Steam boilers are equipment used to generate and
accumulate steam at a pressure higher than the
atmospheric pressure, using any source of heat, except
reboilers and similar equipment used in process units.

13.1.2. For the accomplishment of this Regulation
Standard, it is considered “Qualified Professional” the
one who has legal qualification to exercise the
engineering profession in the activities related to the
construction design code, operational and maintenance
examination, inspection and inspection supervision of
boilers and pressure vessels, in accordance with the
prevailing professional regulation of Brazil.

13.1.3. Maximum Permitted Working Pressure - MPWP or
Maximum Allowable Working Pressure - MAWP is the
highest pressure value in accordance with the design
code, the resistance of the materials used, the equipment
dimensions and their operational parameters.

13.1.4. It constitutes a serious and eminent risk the lack
of any of the following items:

a) safety valve with opening pressure set at or below
the MAWP;

b) device that shows the accumulated steam pressure;
c) injector or other means of feeding water,

independent from the main system, for boilers that
are fired with solid fuel;

d) fast water drain system, in recovering alkali boilers;
e) indicating system to control the level of water or

other system that avoids superheating by defective
feeding.

13.1.5. Every boiler shall have attached on its body, in a
visible and of easy and accessible place, an enduring
identification plate with, at least, the following
information:

a) manufacturer’s name;
b) order number given by the boiler’s manufacturer;
c) year of fabrication;
d) maximum allowable working pressure;
e) hydrostatic test pressure;
f) capacity of steam production;
g) heating surface area;
h) design Code and year of edition.

13.1.5.1. Besides the identification plate there shall be, in
a visible place, the boiler category, in accordance with
the provisions of 13.1.9 hereto, and its identification
number or code.

13.1.6. Every boiler shall have, in the site it has been
installed, the following records, duly updated:

a) a “Boiler Dossier”, having the following information:
- design Code and year of edition;
- materials specification;
- procedures used in the fabrication, assembly, final

inspection and determination of the MAWP;
- a set of drawings and necessary data to follow the

service life of the boiler;
- functioning characteristics;
- safety devices data;
- year of fabrication;
- boiler category.
b) “Safety Record”, in accordance with the provisions

of 13.1.7;
c) “Installation Design”, in accordance with the

provisions of 13.2;
d) “Changing or Repair Designs”, in accordance with

provisions of 13.4.2 and 13.4.3;
e) “Inspection Reports”, in accordance with provisions

of 13.5.11, 13.5.12 and 13.5.13.

13.1.6.1. When nonexistent or lost, the “Boiler Dossier”
shall be restored by the owner, with the manufacturer or
“Qualified Professional’s” (summoned in 13.1.2)
technical responsibility, being indispensable the
restoration of functioning characteristics, safety devices
data and procedures for MAWP determination.

13.1.6.2. When the boiler is sold or transferred to other
site, the records mentioned in “a”, “d” and “e” in 13.1.6
shall follow it.

13.1.6.3. The owner of the boiler shall present, when
requested by the appropriate authority of the Regional
Labor Department, the records mentioned in 13.1.6.

13.1.7. The “Safety Record” shall be made up of a
separate book, with numbered pages, or other similar
system where the following will be recorded:

a) all the relevant events capable to influence on the
boiler safety conditions;

b) the events of periodical and extraordinary safety
inspections, containing the legible name and
signature of the “Qualified Professional”, summoned
in 13.1.2, and the boiler operator present in the event
of the inspection.

13.1.7.1. In the event of the boiler is considered
inadequate for use, the “Safety Record” shall contain
such information and receive a formal conclusion.

13.1.8. The records referred in the 13.1.6 shall be at all
times available for the examination of the operators, the
maintenance and inspection personnel and the employee
and employer representatives at the Accident
Prevention Internal Commission, and the owner shall
ensure complete access to these records.

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a) be technically supervised by a “Qualified
Professional”, summoned in 13.1.2;

b) be ministered by skilled professionals qualified for
this propose;

c) obey, at least, the curriculum showed in the
Appendix I-B herein.

13.8.7. The responsible personnel for the “Safety
Training in Process Unit Operation” performance shall
be restrained from ministering new courses, as well as
subjected to legal penalties, in case of noncompliance of
what is required in 13.8.6.

13.8.8. Every professional with “Safety Training in
Process Unit Operation”, shall fulfill a supervised
practical training, in the operation of pressure vessels,
with the minimum duration of:

a) 300 (three hundred) hours to vessels of categories
“I” or “II”;

b) 100 (one hundred) hours to vessels of categories
“III”, “IV” or “V”;

13.8.9. The enterprise where the supervised practical
training is performed shall inform in advance the union
representatives of the prevailing professional category
in the enterprise:

a) the duration of training performance;
b) the responsible private group, company or

professional for the “Safety Training in Process Unit
Operation”;

c) the list of training applicants.

13.8.10. The knowledge refreshment of the operators
shall be continuous, by means of constant information
of the physical and operational conditions of the
equipment, technical refreshment, safety information,
attendance in courses, speeches and concerned events.

13.8.11. It constitutes a serious and eminent risk the
operation of any pressure vessel in different conditions
foreseen in the original design, unless:

a) it is redesigned taking into account all the relevant
variables contained in the new operational condition;

b) all the safety procedures shall be adopted arising
from its new classification in respect of installation,
operation, maintenance and inspection.

13.9. SAFETY IN THE PRESSURE VESSEL
MAINTENANCE

13.9.1 All repairs or changes in pressure vessels shall
respect the corresponding construction design code and
the manufacturer’s direction in respect of:

a) materials;
b) performance procedures;
c) quality control procedures;
d) personnel qualification and certification.

13.9.1.1. When the construction design code is
unknown, the original concepts of the vessel shall be
respected, using the toughest control procedures
written in the concerned codes.

13.9.1.2. By the “Qualified Professional’s” judgment,
summoned in 13.1.2, calculus technologies or more
advanced procedures shall be used, instead of the
prevailing design standards.

13.9.2. The “Modifying and Repair Designs” shall be
performed in advance in the following conditions:

a) at all times that the design conditions have been
changed;

b) at all times that repairs which compromise the safety
are performed.

13.9.3. The “Modifying and Repair Design” shall:

a) be performed or approved by a “Qualified
Professional”, summoned in 13.1.2;

b) determine materials, execution, quality control and
personnel qualification procedures;

c) be proclaimed to the enterprise’s employees who
may be concerned with the equipment.

13.9.4. All the performances that require welding in parts
that operate under pressure shall be followed by a
hydrostatic test, with characteristics defined by the
“Qualified Professional”, summoned in 13.1.2, taking into
consideration what is determined in 13.10.

13.9.4.1. Small superficial performances may have the
hydrostatic test dismissed, according to the criteria of
the “Qualified Professional”, summoned in 13.1.2.

13.9.5. The pressure vessel safety control systems shall
be submitted to preventive or predictive maintenance.

13.10. PRESSURE VESSEL SAFETY INSPECTION

13.10.1. The pressure vessels shall be submitted to
initial, periodical and extraordinary safety inspections.

13.10.2. The initial safety inspection shall be made on
new vessels, prior to the startup, in the definitive
operational site, having to be submitted to an internal
and external exam and hydrostatic test, considering the
limitations mentioned in 13.10.3.5.

13.10.3. The periodic safety inspection, constituted by
an internal and external exam and hydrostatic test, shall
obey the maximum deadlines as follows:

a) to enterprises which do not have their “Own Service
of Equipment Inspection”, in accordance with the
provisions established in Appendix II:

Vessel
Category

External
Exam

Internal
Exam

Hydrostatic
Exam

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I 1 year 3 years 6 years

II 2 years 4 years 8 years

III 3 years 6 years 12 years

IV 4 years 8 years 16 years

V 5 years 10 years 20 years

b) to enterprises which have their “Own Service of
Equipment Inspection”, in accordance with the
provisions established in Appendix II:

Vessel
Category

External
Exam

Internal
Exam

Hydrostatic
Exam

I 3 years 6 years 12 years

II 4 years 8 years 16 years

III 5 years 10 years self criterion

IV 6 years 12 years self criterion

V 7 years self criterion self criterion

13.10.3.1. Pressure vessels which can not be internally
inspected due to physical impossibility shall be
submitted to a hydrostatic test instead, considering the
foreseen considerations in 13.10.3.5.

13.10.3.2. Vessels with internal filling or catalyst may
have the periodicity of the internal exam widen, in order
to coincide with the changing time of the filling or
catalysts, provided that this extension do not go beyond
20 % of the established deadline in the 13.10.3 herein.

13.10.3.3. Vessels with hygroscopic internal coating,
shall be hydrostatically tested prior to the application of
it, being the forthcoming tests replaced by alternative
techniques.

13.10.3.4. When technically impracticable and by means
of writing on the “Safety Record” by the “Qualified
Professional”, summoned in 13.1.2, the hydrostatic test
may be replaced by other nondestructive technique or
inspection which allows it to obtain similar safety.

13.10.3.5. It is considered technically impracticable to
perform the hydrostatic test when:

a) the structural resistance of base or vessel support
are not compatible with the weight of the water that
should be used in test;

b) the testing fluid harms the internal parts of the
vessel;

c) it is technically impossible to blow down or dry the
system;

d) there is an internal coating;
e) the test brings about a harming influence on

subcritical defects.

13.10.3.6. Vessels which work with operational
temperature under 0°C and operate in conditions with
which the experience shows that deterioration does not
occur, are free from the periodical hydrostatic test, being
required to perform an internal exam every 20 (twenty)
years and external exam every 2 (two) years.

13.10.3.7. When there is no other alternative, the
pneumatic test may be performed, provided that it is
supervised by the “Qualified Professional”, summoned
in 13.1.2, and surrounded by special care, because it is a
highly risky activity.

13.10.4. The safety valves of the pressure vessels shall
be disassembled, inspected and recalibrated when the
periodic internal exam is due.

13.10.5. The extraordinary safety inspection shall be
carried out in the following opportunities:

a) at all times that the vessel is damaged by accident or
other happening able to compromise its safety;

b) when the vessel is submitted to important changes
or repairs able to alter its safety conditions;

c) prior to the vessel startup, when it has been idle for
more than 12 (twelve) months;

d) when there is a change in the vessel installation site.

13.10.6. The safety inspection shall be carried out by a
“Qualified Professional”, summoned in 13.1.2, or by
“Own Service of Equipment Inspection”, summoned in
Appendix II.

13.10.7. After the pressure vessel is inspected, an
“Inspection Report” shall be emitted, which shall belong
to its records.

13.10.8. The “Inspection Report”, shall contain at least:

a) pressure vessel identification;
b) service fluids and pressure vessel category;
c) type of pressure vessel;
d) starting and finishing date of inspection;
e) type of inspection carried out;
f) description of the realized inspections and tests;
g) result of the inspections and measures;
h) conclusions;

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TIME LIMITS FOR THE ENTERPRISES TO ADAPT THEMSELVES TO THE NR-13
REGULATION STANDARD

In a meeting held in Brazil on November 18, 1994, the WORKING GROUP FOR THE REVIEW OF
THIS NR-13 REGULATION STANDARD established the following time limits for the enterprises to
adapt themselves to the requirements of the standard hereto.

BOILERS

13.1.4 Adjustment of pressure gauges, safety valves, level control systems, etc.

180 days

13.1.5 Adjustment of identification plate and painting or placing additional plates.

90 days

13.1.6 Adjustment of the boiler dossier and complementary documentation.

120 days

13.1.9 Boiler classification in accordance with volume and pressure.

90 days

13.2 Adjustment of the installation to the standard minimum requirements.

180 days

13.3.1 Adjustment of the operation manuals.

180 days

13.3.4 to 13.3.10 Adjustment of the new operators’ training.

90 days

13.4.5 Introduction of the preventive maintenance plan in safety control systems.

90 days

13.5 The time limits for the boiler safety inspection shall be immediately adjusted, taking the date of the
last periodical/extraordinary inspection as the starting point.

THE REMAINING ITEMS RELATED TO THE BOILERS SHALL BE IMMEDIATELY
ADJUSTED AFTER THE EDITION OF THIS REGULATION.

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PRESSURE VESSELS

13.6.1 Pressure vessel classification.

120 days

13.6.2 Adjustment of pressure gauges, safety valves, etc.

270 days

13.6.3 and 13.6.3.1 Adjustment of identification plate and painting or placing additional plates with the
category.

180 days

13.6.4.a Adjustment of documentation.

180 days

13.6.4.c Elaboration of the installation design.

180 days

13.7 Adjustment of the installation.

180 days

13.8.1 Adjustment of the operation manuals.

180 days

13.8.3 New operators’ training.

180 days

13.9.5 Introduction of the preventive maintenance plan in safety control systems.

120 days

13.10 The time limits for the boiler safety inspection shall be immediately adjusted, taking the date of the
last periodical inspection or hydrostatic test as the starting point.

THE REMAINING ITEMS RELATED TO THE BOILERS SHALL BE IMMEDIATELY
ADJUSTED AFTER THE EDITION OF THIS REGULATION.

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