SIST EN ISO 18796-1:2020

SLOVENSKI STANDARD
01-december-2020
Petrokemična industrija ter industrija za predelavo nafte in zemeljskega plina -
Notranji premazi in obloge posod za proizvodnjo ogljikovega jekla - 1. del:
Tehnične zahteve (ISO 18796-1:2018)
Petroleum, petrochemicals and natural gas industries - Internal coating and lining of
carbon steel process vessels - Part 1: Technical requirements (ISO 18796-1:2018)
Erdöl-, petrochemische und Erdgasindustrie - Innere Schutzbeschichtungen und
Auskleidungen für Prozessbehälter aus unlegiertem Stahl - Teil 1: Allgemeine
Anforderungen (ISO 18796-1:2018)
Industries du pétrole, de la pétrochimie et du gaz naturel - Revêtement de protection
interne et doublure des récipients de production en acier au carbone - Partie 1:
Exigences techniques (ISO 18796-1:2018)
Ta slovenski standard je istoveten z: EN ISO 18796-1:2020
ICS:
75.180.20 Predelovalna oprema Processing equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 18796-1
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2020
EUROPÄISCHE NORM
ICS 75.180.20
English Version
Petroleum, petrochemicals and natural gas industries -
Internal coating and lining of carbon steel process vessels -
Part 1: Technical requirements (ISO 18796-1:2018)
Industries du pétrole, de la pétrochimie et du gaz Erdöl-, petrochemische und Erdgasindustrie - Innere
naturel - Revêtement de protection interne et doublure Schutzbeschichtungen und Auskleidungen für
des récipients de production en acier au carbone - Prozessbehälter aus unlegiertem Stahl - Teil 1:
Partie 1: Exigences techniques (ISO 18796-1:2018) Allgemeine Anforderungen (ISO 18796-1:2018)
This European Standard was approved by CEN on 4 October 2020.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 18796-1:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
The text of ISO 18796-1.2018 has been prepared by Technical Committee ISO/TC 67 "Materials,
equipment and offshore structures for petroleum, petrochemical and natural gas industries” of the
International Organization for Standardization (ISO) and has been taken over as EN ISO 18796-1:2020
by Technical Committee CEN/TC 12 “Materials, equipment and offshore structures for petroleum,
petrochemical and natural gas industries” the secretariat of which is held by NEN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by April 2021, and conflicting national standards shall be
withdrawn at the latest by April 2021.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 18796-1.2018 has been approved by CEN as EN ISO 18796-1:2020 without any
modification.
INTERNATIONAL ISO
STANDARD 18796-1
First edition
2018-10
Petroleum, petrochemicals and
natural gas industries — Internal
coating and lining of carbon steel
process vessels —
Part 1:
Technical requirements
Industries du pétrole, de la pétrochimie et du gaz naturel —
Revêtement de protection interne et doublure des récipients de
production en acier au carbone —
Partie 1: Exigences techniques
Reference number
ISO 18796-1:2018(E)
©
ISO 2018
ISO 18796-1:2018(E)
© ISO 2018
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved

ISO 18796-1:2018(E)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and abbreviated terms . 3
3.1 Terms and definitions . 3
3.2 Abbreviated terms . 4
4 Conformance . 5
4.1 Rounding . 5
4.2 Conformance to this document . 5
5 Pre-work requirements . 6
5.1 General . 6
5.2 Safety precautions in flammable atmosphere . 6
5.3 Safety precautions in confined space . 6
5.4 Safety precautions for blasting and coating works. 6
5.5 Isolation and ventilation . 7
5.6 Qualification of coating/lining application and inspection personnel . 7
6 Coating/lining materials . 7
6.1 General . 7
6.2 Approvals . 7
6.3 Procedure qualification trial (PQT) . 8
6.4 Pre-production trial (PPT) . 8
6.5 Thickness classifications of coatings . 9
6.6 Holding (blast) primer . 9
6.7 Coating and lining systems . 9
6.8 Material approvals — Coating and lining systems .10
7 Surface preparation .11
7.1 General .11
7.2 Preparations .11
7.3 Patching, grinding, degreasing and washing (for new and rehabilitation works) .12
7.4 Dry abrasive blasting cleaning .12
7.5 Humidity control .13
7.6 After blast cleaning.14
8 Coating/lining application .14
8.1 General requirements .14
8.2 Application of environmental conditions .15
8.3 Primer application .15
8.4 Coating/lining thickness .15
9 Coating/lining application .16
10 Inspection and testing .16
10.1 General requirements .16
10.2 Environmental conditions testing .17
10.3 Materials and equipment inspection .17
10.4 Compressed air and abrasive .17
10.5 Surface preparation inspection .17
10.6 Coating/lining inspection and testing .18
10.6.1 General.18
10.6.2 Lining film thickness .18
10.6.3 Holiday detection test . .18
10.6.4 Curing test .18
ISO 18796-1:2018(E)
10.7 Adhesion test .19
11 Quality requirements .19
12 Documentation .19
12.1 General .19
12.2 Work proposal .20
12.3 Work records/reports .20
12.4 Inspection and testing reporting .20
12.5 Final report .20
Annex A (informative) Example of coating/lining work record/data sheet .21
Annex B (informative) Example of coating/lining inspection and testing data sheet .22
Bibliography .23
iv © ISO 2018 – All rights reserved

ISO 18796-1:2018(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso
.org/iso/foreword .html.
This document was prepared by ISO/TC 67, Materials, equipment and offshore structures for petroleum,
petrochemical and natural gas industries.
A list of all parts in the ISO 18796 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/members .html.
ISO 18796-1:2018(E)
Introduction
The objective of this document is to define the minimum technical requirements for the corrosion
protection by coating/lining of internal surfaces of carbon steel process vessels used in the oil and
gas industry and subject to marked pressure/temperature changes and/or acidic or other aggressive
chemicals. In addition, this document provides technical guidance for developing project specifications
and helps to ensure compliance in coating/lining material selection and performance with contract
requirements.
Further or differing requirements can be specified for individual applications. This document does not
limit the contractor and/or manufacturer from proposing, or the company from accepting, alternative
engineering solutions for the individual application. This can particularly be applicable where there is
an innovative or emerging technology. Where an alternative is proposed, the specification issuer will
need to identify any deviation from this document and provide details.
vi © ISO 2018 – All rights reserved

INTERNATIONAL STANDARD ISO 18796-1:2018(E)
Petroleum, petrochemicals and natural gas industries —
Internal coating and lining of carbon steel process
vessels —
Part 1:
Technical requirements
1 Scope
This document specifies the minimum technical requirements for surface preparation, materials,
application, inspection and testing of internal coating and lining systems that are intended to be applied
on internal surfaces of process vessels that are subject to marked pressure/temperature changes and/
or potentially corrosive conditions or processes and aggressive chemicals, used in the oil and gas
industry.
This document covers both new construction and maintenance works of process vessels as well as the
repair of defective and deteriorated coating and lining systems.
This document also provides the minimum requirements for the coated and lined samples and the
criteria for their approval.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 2812 (all parts), Paints and varnishes — Determination of resistance to liquids
ISO 3233 (all parts), Paints and varnishes — Determination of the percentage volume of non-volatile matter
1)
ISO 4624 , Paints and varnishes — Pull-off test for adhesion
ISO 7027, Water quality — Determination of turbidity
ISO 7619-1, Rubber, vulcanized or thermoplastic — Determination of indentation hardness — Part 1:
Durometer method (Shore hardness)
2)
ISO 8501-1 , Preparation of steel substrates before application of paints and related products — Visual
assessment of surface cleanliness — Part 1: Rust grades and preparation grades of uncoated steel substrates
and of steel substrates after overall removal of previous coatings
ISO 8501-3, Preparation of steel substrates before application of paints and related products — Visual
assessment of surface cleanliness — Part 3: Preparation grades of welds, edges and other areas with surface
imperfections
ISO 8502-3, Preparation of steel substrates before application of paints and related products — Tests for
the assessment of surface cleanliness — Part 3: Assessment of dust on steel surfaces prepared for painting
(pressure-sensitive tape method)
1) ASTM D4541 is equivalent to this document.
2) SSPC-SP5/NACE No. 1 is equivalent to this document.
ISO 18796-1:2018(E)
3)
ISO 8502-6 , Preparation of steel substrates before application of paints and related products — Tests
for the assessment of surface cleanliness — Part 6: Extraction of soluble contaminants for analysis — The
Bresle method
4)
ISO 8502-9 , Preparation of steel substrates before application of paints and related products — Tests
for the assessment of surface cleanliness — Part 9: Field method for the conductometric determination of
water-soluble salts
5)
ISO 10474 , Steel and steel products — Inspection documents
ISO 11124 (all parts), Preparation of steel substrates before application of paints and related products —
Specifications for metallic blast-cleaning abrasives
ISO 11125 (all parts), Preparation of steel substrates before application of paints and related products —
Test methods for metallic blast-cleaning abrasives
ISO 11126 (all parts), Preparation of steel substrates before application of paints and related products —
Specifications for non-metallic blast-cleaning abrasives
ISO 11127-6, Preparation of steel substrates before application of paints and related products — Test
methods for non-metallic blast-cleaning abrasives — Part 6: Determination of water-soluble contaminants
by conductivity measurement
6)
ISO 16276 (all parts) , Corrosion protection of steel structures by protective paint systems — Assessment
of, and acceptance criteria for, the adhesion/cohesion (fracture strength) of a coating
7)
ISO 19840 , Paints and varnishes — Corrosion protection of steel structures by protective paint systems —
Measurement of, and acceptance criteria for, the thickness of dry films on rough surfaces
8)
,
ISO 21809-3:2016 Petroleum and natural gas industries — External coatings for buried or submerged
pipelines used in pipeline transportation systems — Part 3: Field joint coatings
9)
ISO 29601 , Paints and varnishes — Corrosion protection by protective paint systems — Assessment of
porosity in a dry film
ISO 80000-1:2009, Quantities and units — Part 1: General
ASTM D522, Standard Test Methods for Mandrel Bend Test of Attached Organic Coatings
ASTM D610, Standard Practice for Evaluating Degree of Rusting on Painted Steel Surfaces
ASTM D714, Standard Test Method for Evaluating Degree of Blistering of Paints
ASTM D2583, Standard Test Method for Indentation Hardness of Rigid Plastics by Means of a Barcol
Impressor
ASTM D4060, Standard Test Method for Abrasion Resistance of Organic Coatings by the Taber Abraser
ASTM D4285, Standard Test Method for Indicating Oil or Water in Compressed Air
ASTM D4414, Standard Practice for Measurement of Wet Film Thickness by Notch Gages
3) SSPC-Guide 15 is equivalent to this document (together with ISO 8502-9).
4) SSPC-Guide 15 is equivalent to this document (together with ISO 8502-6).
5) EN 10204 is equivalent to this document.
6) ASTM D4541 is equivalent to this document.
7) SSPC-PA2 is equivalent to this document.
8) ASMT G42 is equivalent to this document.
9) NACE SP0188 is equivalent to this document.
2 © ISO 2018 – All rights reserved

ISO 18796-1:2018(E)
ASTM F21, Standard Test Method for Hydrophobic Surface Films by the Atomizer Test
NACE/TM 0174, Standard Test Method — Laboratory Methods for the Evaluation of Protective Coatings
and Lining Materials on Metallic Substrates in Immersion Service
SSPC-SP1. Steel Structure Painting Council Surface Preparation Specifications — Solvent Cleaning
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1.1
abrasive blast cleaning
surface preparation method that uses an abrasive propelled by air pressure, centrifugal force, or water
pressure to clean and usually to profile a surface
3.1.2
application procedure specification
document describing procedures, methods, equipment and tools used for coating application
3.1.3
applicator
contractor or subcontractor having the technical capability, knowledge, equipment, qualified personnel
that is approved by the client for the coating processes as required by this document
3.1.4
coat
one layer of protective coating or paint applied to the surface in a single application to form an evenly
distributed film when dry
3.1.5
contractor
vendor or company that agrees to furnish materials and/or perform specific project/services to the client
3.1.6
curing
chemical process of developing the intended properties of a coating/polymerized product in the lining
system, generally due to a reaction between two or more chemicals (e.g. resin and curative)
3.1.7
client
entity for which professional services are rendered or person that receives a product
3.1.8
dew-point
temperature of a given air/water vapour mixture at which condensation starts, because its maximum
water content saturation is reached at that temperature
3.1.9
dry film thickness
thickness of a coat of paint, layer of tape or coating system in its fully cured condition
ISO 18796-1:2018(E)
3.1.10
epoxy
resin containing functional epoxy groups that allow for curing by polymerization with a variety of
curatives
3.1.11
grit abrasive
angular or irregularly shaped particles of abrasives
3.1.12
holiday
discontinuity in a lining or contamination in the coating film that significantly lowers the performance
of a coating
Note 1 to entry: Examples of discontinuity in a lining are pinhole, void, crack, thin spot, and inclusion of foreign
material.
3.1.13
lining
internal coating
Note 1 to entry: The term 'coating' is also used for the purposes of this document.
Note 2 to entry: Internal coating can be applied to the internal surfaces of a tank vessel to serve as a barrier to
corrosion and/or product contamination, for example.
3.1.14
novolac
phenol-formaldehyde resin with formaldehyde to phenol molar ratio of less than 1
3.1.15
phenolic
resin of the phenol-formaldehyde type
3.1.16
pinhole
small film defect characterized by small pore like flaws in the lining that would permit corrosion of the
substrate under the conditions for which the lining is designed
Note 1 to entry: A pinhole can extend entirely through the film and lead to a holiday.
3.1.17
surface profile
micro-roughness of a surface, generally expressed as the average height of the major peaks relative to
the major valleys
3.2 Abbreviated terms
APS application procedure specification
ASTM American Society for Testing and Materials
BGAS British Gas
BS British Standard
CV curriculum vitae
DFT dry film thickness
GRUP glass reinforced unsaturated polyester
4 © ISO 2018 – All rights reserved

ISO 18796-1:2018(E)
GRVE glass reinforced vinyl ester
GSO Gulf Standardization Organization
HBE high build epoxy
HSE health, safety and environment
ISO International Organization for Standardization
ITP inspection and testing plan
MSDS materials safety data sheet
NACE National Association of Corrosion Engineers
NTU nephelometric turbidity units
OSHA Occupational Safety and Health Administration
PPT pre-production trial
PQT procedure qualification trial
QA/QC quality assurance/quality control
QP qualification procedure
RH relative humidity
RP recommended practice
SSPC Society for Protecting Coatings
WFT wet film thickness
4 Conformance
4.1 Rounding
Unless otherwise stated in this document, to determine conformance with the specified requirements,
observed or calculated values shall be rounded to the nearest unit in the last right-hand place of figures
used in expressing the limiting value, in accordance with ISO 80000-1:2009, Annex B, Rule A.
NOTE For the purpose of this provision, the rounding method of ASTM E29-08 is equivalent to
ISO 80000-1:2009, Annex B, Rule A.
4.2 Conformance to this document
Management systems based on ISO 9001 and ISO 14001 and good laboratory practice should be applied
to assist conformance with the requirements of this document. ISO/TS 29001 gives sector-specific
guidance on quality management systems.
The applicator shall be responsible for conforming to all of the applicable requirements of this
document.
ISO 18796-1:2018(E)
5 Pre-work requirements
5.1 General
5.1.1 All necessary HSE procedures shall be followed to protect personnel and the surrounding
environment during on-site/field works.
5.1.2 The contractor/supplier shall submit their HSE manual for client's approval. The approved
recommended procedures for safe lining processes shall be strictly followed.
5.1.3 All relevant requirements for fire safety, client's safety regulations for contractors and lifting
equipment regulations shall be followed while performing work within the operation areas.
5.1.4 An MSDS shall be submitted as required.
5.1.5 All wastes resulting from supply and installation shall be contained, collected and properly
disposed of in accordance with local HSE protection standards or regulations.
5.2 Safety precautions in flammable atmosphere
5.2.1 Where there is a risk of a flammable atmosphere being present in a particular vessel, the client
may, with relevant safety authority, impose restrictions on methods of surface preparation based on area
classification for plant design and construction/maintenance projects.
5.2.2 The contractor shall submit to the client, for approval, all necessary data for the proposed
coating/lining systems, solvents and coating procedures in order to permit area classification to be
determined for the duration of coating work.
5.2.3 All equipment used in surface preparation, coating/lining application and inspection, including
floodlights or spotlights, shall be explosion-proof and spark-proof.
5.2.4 Prior to surface preparation, all scales shall be removed from the vessel and shall be properly
weathered prior to disposal. The flammable atmosphere inside the vessel shall be monitored.
5.3 Safety precautions in confined space
The procedures for performing safe work in confined spaces shall be in accordance with the client's
identified HSE regulations.
5.4 Safety precautions for blasting and coating works
5.4.1 The abrasive blast nozzle shall be bonded (grounded) to the work metal in order to prevent the
build-up of electrostatic charges, which could cause a spark discharge.
5.4.2 Nozzle blast operators shall wear goggles and an approved helmet and shall be connected to a
source of clean air. All other persons exposed to the blast dust and chemical fumes shall wear air-supplied
respirators.
5.4.3 Any surface laps, scabs, or seams exposed by abrasive blasting shall be reported immediately to
the client so they can take appropriate action.
5.4.4 Adequate fresh air ventilation shall be provided during all lining work.
6 © ISO 2018 – All rights reserved

ISO 18796-1:2018(E)
5.4.5 The coating manufacturer's recommended precautions regarding toxicity and safe handling of all
coating materials shall be followed. Special care shall be taken when mixing resins to avoid fire hazards.
For coatings that use a promoter, catalyst and resin (such as polyesters and vinyl esters), the promoter
and resin shall be mixed thoroughly before adding the catalyst.
5.5 Isolation and ventilation
5.5.1 All pipeline/piping shall be disconnected at the vessels valves and the open ends of pipes shall be
blanked off and blinded. All tubular housing and conduits connected to the vessels for gauging or other
instrumentation purpose shall be disconnected. Cathodic protection, if any, shall be disconnected only
during the actual surface preparation and coating application works. The vessel should have provision to
exhaust gases by at least two air changes per hour and vented at high level on the downwind side.
5.5.2 The vessel shall be lit and ventilated in accordance with the client's approved standards and local
HSE regulations. All parts of the work shall be clearly visible.
5.6 Qualification of coating/lining application and inspection personnel
5.6.1 The coating/lining operatives shall be competent to undertake the coating application,
inspection/testing procedures and repair work. The qualification may be obtained as agreed with the
client or by demonstration at a PQT during PPT.
5.6.2 Inspectors and applicator personnel carrying out the coating inspection shall be competent (see
8.1.2) to carry out the requirements of this document. The applicator shall request the manufacturer
of the coating/lining material(s) and equipment to provide technical assistance to the coating/lining
operatives, if necessary.
6 Coating/lining materials
6.1 General
6.1.1 The materials and equipment used for surface preparation, coating application, inspection and
testing shall comply with the requirements of this document, the referenced standards and codes.
6.1.2 The coating/lining materials shall be delivered to the site in original manufacturer's sealed and
previously unopened containers to assure the coating/lining materials are free from contaminants. The
date of manufacture and expiry date shall be clearly marked thereon. The age of coating materials shall
not exceed the recommended shelf life as limited by the manufacturers.
6.1.3 All coating/lining materials intended to be used should have a 5-years proven performance in the
relevant service liquid or as agreed by the client. The details shall be submitted to the client for review
and approval.
6.1.4 The coating work shall be undertaken by applicators, including supervisors and workers,
with experience on installing the type of internal coating/lining specified, and in accordance with
manufacturer's recommendations and approved by the client.
6.2 Approvals
6.2.1 All coating/lining materials and thinners in any multi-coat system shall originate from a single
manufacturer. For a particular project or maintenance job, the use of different materials shall be subject
to the client's written approval and the coating manufacturer's compatibility confirmation.
ISO 18796-1:2018(E)
6.2.2 The contractor's submittal for coating/lining materials shall include details of manufacturer,
composition, technical specifications and performance-based testing of the materials to be used, which
complies with the requirements of this document. This shall be reviewed and approved by the client.
6.2.3 The proposed coating/lining system shall be based on the following aspects:
a) analysis of product(s) to be stored including all major and minor constituents;
b) temperature conditions and exposure intervals including the designed operating conditions and
cyclic temperature conditions;
c) procedures for cleaning the vessel at turnaround times (e.g. steam cleaning, and exposure time) as
well as cleaning agents to be used;
d) pressure or vacuum operation:
― designed and operating,
― cyclic, or
― rapid (explosive) decompression from operating pressure;
e) abrasion or erosion conditions including amount, particle size, and flow rates;
f) possible damage caused by vibration, installation, welding operations, etc.;
g) the intended internal inspection cycle (1 year, 5 years, 10 years, or other time period);
h) condition of existing surface;
i) coating/lining material curing time;
j) previous experience on performance of coating system.
6.3 Procedure qualification trial (PQT)
6.3.1 Unless otherwise required by the client, the APS shall be qualified by a PQT. Test methods and
acceptance criteria for the PQT are identified and specified in 6.8.
6.3.2 The applicator may request the manufacturer(s) to assist during the PQT to ensure the correct
use of the coating/lining material(s).
6.3.3 Qualification tests shall be carried out on representative test plates.
6.3.4 All tools/equipment and material specifications used for the PQT shall be of the same type/
specifications as those being used for the actual coating/lining.
6.3.5 Coating repairs of defective internal process vessel coating/lining shall be included in the PQT.
6.3.6 The applicator shall submit a complete report of the qualification test results to the client or his
representative for approval.
6.4 Pre-production trial (PPT)
6.4.1 Unless otherwise required by the client, a PPT shall be performed on site to verify the following
aspects:
a) coating/lining system;
8 © ISO 2018 – All rights reserved

ISO 18796-1:2018(E)
b) coating/lining materials;
c) coating/lining application procedure;
d) qualification of equipment being used for surface preparation and coating application;
e) application of the coating system;
f) qualification of the coating operatives and inspectors that will actually be used in the field.
6.4.2 The aspects listed in 6.4.1 shall comply with the requirements of this document and the results of
any previous PQT.
6.4.3 Test methods and acceptance criteria for the PPT are identified and specified in 6.8.
6.4.4 The PPT shall be carried out in the presence of the client and/or applicator (or their
representative) at the start of operations when equipment and personnel are mobilized on site. The PPT
shall be performed on the first test plate to be coated.
6.4.5 Unless there is previous long-term (5 years) experience demonstrating that a coating and lining
is suitable for the specified process conditions, appropriate testing shall be conducted as directed by
the client.
6.5 Thickness classifications of coatings
6.5.1 Thin-film coatings are applied coatings for which the total DFT is up to 250 μm (10 mils).
6.5.2 Thick-film coatings are applied coatings for which the total DFT is between 250 μm (10 mils) and
760 μm (30 mils).
6.5.3 Extra-heavy-film coatings are applied coatings for which the total DFT is greater than 760 μm
(30 mils).
6.6 Holding (blast) primer
If a holding primer is to be used, it shall be part of a qualified approved coating system.
6.7 Coating and lining systems
6.7.1 There are many coating and lining systems that can be considered for the internal corrosion
protection of carbon steel process vessels. Selection criteria for the suitable coating and lining system for
tank internal corrosion protection should be identified and defined for guidance.
6.7.2 The coating and lining systems can be applied in multiple coats and can be ambient-
temperature cured.
6.7.3 Coatings and linings are applied in the shop or field. The force curing procedure shall be strictly
followed as provided by the coating/lining manufacturer and duly accepted by the client.
6.7.4 Ambient-temperature cured coatings shall not be force cured, unless the design and operation of
such force curing procedure is approved by the client and the lining manufacturer.
6.7.5 The coating and lining materials shall be capable of withstanding operating conditions (e.g.
service temperature, pressure and media) as specified by the client.
ISO 18796-1:2018(E)
6.7.6 The HBE shall be capable of building up the recommended thickness without any film defects.
6.8 Material approvals — Coating and
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