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JB/T 4711-2003 (JB/T4711-2003, JBT 4711-2003, JBT4711-2003) & related versions
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JB/T 4711-2003: PDF in English (JBT 4711-2003)
JB/T 4711-2003
Replacing JB 2536-1980
Coating and packing for pressure vessels transport
Issued by: State Economic and Trade Commission of the People's
Republic of China
Table of Contents
Announcement of the State Economic and Trade commission of the People's
Republic of China ... 3 
Foreword ... 5 
1 Scope ... 6 
2 Normative references ... 6 
3 Coating ... 6 
4 Packing for transport ... 8 
5 Pictorial marks ... 14 
Standard interpretation for JB/T 4711-2003 “Coating and packing for pressure
vessels transport” ... 16 
Supplementary statement on matters related to the standard of reference ... 20 
Coating and packing for pressure vessels transport
1 Scope
This Standard specifies relevant requirements of coating and packing for
transport of pressure vessels and their components and parts.
In addition to those specified in this Standard, coating and packing for transport
of pressure vessels and their components and parts shall also meet the
technical requirements of drawings.
2 Normative references
The following normative documents contain provision which, through reference
in this text, constitute provisions of this standard. For dated reference,
subsequent amendments to (excluding corrigendum), or revisions of, any of
these publications do not apply. However, all parties coming to an agreement
according to this standard are encouraged to study whether the latest editions
of these documents are applicable. For undated references, the latest edition
of the normative document referred to applies.
GB/T 146.1-1983, Rolling Stock Gauge for Standard Gauge Railways
GB 146.2-1983, Structure Gauge for Standard Gauge Railway
GB 191-2000, Packaging-Pictorial Marking for Handling of Goods
GB/T 197-1981, General Purpose Screw Threads -- Tolerances and Fits for
Diameter from 1 to 355mm
GB/T 8923-1988, Rust Grades and Preparation Grades of Steel Surfaces
Before Application of Paints and Related Products
3 Coating
3.1 Surface de-rusting
3.1.1 Clear off rusts on external surfaces of vessels that are made of carbon
steel and low alloy steel, rusts on internal surfaces on which de-rusting
operation can be conducted and other coated surfaces that require coating with
anticorrosive paint.
again. If rusty stain or pollution is discovered, perform surface treatment.
Coating environment shall clean, dry and draughty. Environment temperature
shall not be less than the specified coating temperature of paint.
Coated anticorrosive paint shall be uniform and firm, be free from defects such
as bubble, cracking, sagging and peeling; otherwise, it shall be repaired. When
necessary, use special apparatus to test thickness and compactness of coating.
3.2.5 Unless otherwise specified in drawing, anticorrosive paint may not be
coated under the following conditions:
a) internal surface of vessel;
b) internal components exited factory along with assembled vessel;
c) stainless steel pressure vessels;
d) pressure vessels made of non-ferrous metals and their alloys.
3.2.6 As for following grooves, anticorrosive paint shall not be coated within the
range of approximate 100mm to groove edge. If coating is required, protective
film that is harmless to welding quality and is easy to remove may be coated:
a) cut surface grooves of vessels exited factory in segments;
b) peripheral grooves of grooves in pieces;
c) other welding grooves on vessel shell that need to be assembled and
welded at application site.
3.3 Coating of protective film
Polished surfaces, e.g. screw threads and sealing surfaces, shall be coated
with protective film that is easy to remove.
4 Packing for transport
4.1 General packing requirements for transport
4.1.1 Select adaptable packing structure and method according to
characteristics such as application requirements, structure dimensions, weight,
distance and means of transport (railway, highway, waterway and air) of vessel.
The packing of vessel shall have sufficient intensity to ensure that vessel and
its components and parts are able to be transported to destination safely and
space, manufacturer shall provide stowage plan to indicate positions of
accessories to be relocated or removed; it shall obtain purchaser’s approval in
written form. On such circumstances, manufacturer shall provide reassembling
and welding procedures as well as inspection method required for site welded
connection pipes.
4.2 Packing type of vessels
4.2.1 Nude packing
Large or extra-large parts that have enough rigid and are undetachable shall
be supported by bracket at the bottom and be tensioned by tensioning hoop at
the top to prevent rolling and motion.
4.2.2 Frame
Vessel as well as its components and parts are reliably fixed in firm frame that
is made of section steel or square timber.
4.2.3 Wrapping
Use soft materials to pack components and parts that are not easy to be
damaged or lost during transport and loading/unloading process, that have
relatively big specification and small quantity. Then use iron wire or flat steel to
tie up.
4.2.4 Dark case
Dark case refers to enclosed packing case that is used to pack high-precision
small parts that are easy to be damaged or lost and shall be protected from
moisture and corrosion.
4.2.5 Skeleton case
Use this packing type for components and parts that do not need dark case and
shall not be wrapped. The case may be lined with asphalt felt inside if necessary.
4.3 Packing for transport of vessels exited factory in a whole or in
4.3.1 General requirements
Generally, use nude packing for vessels exited factory in whole or in segments.
4.3.2 Packing for transport of vessels exited factory in a whole Prior to shipping, remove all residues in vessel. Manufacturer shall conduct package design according to specific
4.3.3 Packing for transport of vessels exited factory in segments For vessels that exit factory in segments, if rigidity of opening end is
insufficient, it shall set reinforcing stay and seal the opening in appropriate
mode. Other requirements are same with of this Standard.
4.4 Packing for transport of vessels exited factory in pieces
4.4.1 Before packing, number and mark the pieces according to sequence of
cutting plan.
4.4.2 Overlap each group of pieces on steel or wood convex brackets, concave
face facing downward. Use wood block (or other buffer materials) to cushion
the pieces between them. Use flat steel and bracket to tied up and weld. For
cylindrical vessels, divide into pieces. The pieces shall be overlapped upright
and be bundled.
4.4.3 Gross weight of each group of pieces and brackets shall not exceed 15t.
If necessary, set lifting lug for bracket to lift it. It is forbidden to directly lift the
pieces up.
4.5 Packing for transport of vessels that have special requirements
4.5.1 For pressure vessels that are made of stainless steel, non-ferrous metal
and its alloy, special packing requirements for transport are as follows:
a) Before loading for transport, thoroughly clean up residues, oil stain and
water stain in vessels;
b) when lifting, use nylon sling or steel wire rope that has protective case. It
is strictly forbidden to directly tie steel wire rope onto vessel for lifting.
During packing process for transport, other measures shall be taken so as
to prevent potential pollution of harmful ions such as iron and copper.
c) during packing process for transport, measures shall be taken to protect
anticorrosive surfaces against various damages. If passive (oxidation) film
of anticorrosive surface is damaged during packing process for transport,
measures shall be taken to restore it so as to meet original technical
4.5.2 Special packing requirements for transport of vessels that need to be filled
with inert gas for shielding are as follows:
a) type, concentration and pressure of inert gas that is filled in vessel shall
be in accordance with technical requirements of drawing;
medium or precise level specified in GB/T 197-1981, in addition that their screw
threads shall be coated with protective film in accordance with 3.3 of this
Standard, they shall also be added with shield for protection.
4.6.5 When casing, heavy components and parts shall be placed at lower part
of case so as to lower package gravity center. Where it is incapable to realize
it, appropriate measures shall be taken to ensure gravity center not exceeding
1/2 of case height.
4.6.6 Weight per packing case shall not exceed 3t.
4.7 Packing for transport of documentary data
4.7.1 Documentary data includes product’s exit-factory quality certificate,
packing list and relevant documents specified in of this Standard. Each batch of goods shipped must be accompanied with a packing list
to indicate the goods at each location number in every case, in every bag and
in every stand, to indicate that if the goods are integral or they are only parts. According to delivery conditions and packing conditions for transport of
vessels, the following documentary data shall also be included if necessary:
a) installation drawing and installation instructions;
b) stowage plan required in 4.1.7, field reassembling and welding procedure
documents, and documents required for inspection;
c) arrangement drawing of vessel exited factory in pieces.
4.7.2 All documentary data shall be sorted and bound in book form and shall be
packed and sealed in plastic bags so as to prevent water, moisture and missing.
4.7.3 Where the above-mentioned documentary data are dispatched together
with goods, they shall be packed in the biggest dark case. The dark case shall
be clearly marked on external face. The quality evidentiary documents may also
be posted separately.
5 Pictorial marks
5.1 Make the following marks on surface of nude-packed vessel and obvious
parts of packing case:
a) Delivery mark:
1) factory number (or command letter No.);
Standard interpretation for JB/T 4711-2003 “Coating
and packing for pressure vessels transport”
This Standard is based on JB 2536-1980. It adopts the latest results of
application research of coating technology in antisepsis and life extension in
national "Ninth Five-Year Plan" Key Technology Research Project "Research
on Life Prediction of Pressure Vessels in Service". It is stipulated after
substantial supplement, modification and improvement. The main modifications
and supplements are explained as follows.
1 About modification on standard’s name
The name of JB 2536 is “Paint, Packing and Transportation of Pressure
Vessels”. In this Standard, it modified the “paint” to “coating”, “packing and
transportation” to “packing for transport”. The reasons are as follows:
1) JB 2536 was formulated in late 1970s. At that time, the surface of pressure
vessels only required to spray antirust paint. It also only specified simple
principle requirements for drying, oil stain removing, rust removing,
welding spatter removing to metal surface in front of paint. In JB 2536, it
also made a table to recommend major paint types for user.
More than 20 years have passed, and technology and people’s
requirements for product quality (including surface quality) have been
greatly improved. Various new metal and non-metallic anticorrosive
coatings continue to appear. Surface modification technology has been
widely used in many production fields. Therefore, simple painting cannot
meet requirements for many pressure vessels. For this reason, we
modified “paint” in standard’s name to “coating”. “Coating” is selected so
as to be in line with the internationally-accepted name. It includes quality
level requirements for surface de-rusting and quality requirements for
coating of anticorrosive coating.
2) This Standard does not specify product’s transport. It only specifies
packing requirements when product is transported. Therefore, it is more
suitable to modify the name to “packing for transport”.
2 About applicable scope of standard
JB 2536 is only applicable to “painting, packing and transport of various welding
pressure vessels that are made of carbon steel, low alloy steel and stainless
acid resistant steel used for petroleum, chemical industries”.
There are many anticorrosive coatings, including metal, non-metallic, and metal,
non-metal mixed. Antirust paint is only one of them. The major role of
anticorrosive coating is to strictly isolate corrosive medium from metal surface,
so as to reach anticorrosive, prolong service life and save valuable materials.
Considering the market economy conditions, it is generally not to recommend
products in the standard. Besides, different corrosive environments require
different types of anticorrosive coatings. Therefore, this Standard does not
recommend variety model of anticorrosive coating. Instead, it specifies
selection principle of anticorrosive coating (3.2.2), requirements for
anticorrosive coating (3.2.3), coating operation and coating quality
requirements (3.2.1 and 3.2.4) as well as conditions that anticorrosive coating
is not needed (3.2.5).
What needs to be explained here is that the term “new anticorrosive coating”
as used in 3.2.3 of this Standard refers to a coating that lacks the necessary
experience under the same or similar conditions (including medium,
temperature, etc.).
5 About packing requirements for flange interface
Flange interface, to-be-welded groove, thread interface are parts that shall be
specially protected during transport. Therefore, in 4.1.4~4.1.6 of this Standard
respectively propose strict requirements for their packings in case that they are
damaged during transport as well as -loading-unloading process.
6 About packing of vessels exited factory in pieces
JB 2536-1980 required to overlap pieces on bracket, concave face facing
upward. With the accumulation of technical experience, this method has long
been abandoned. In 4.4.2 of this Standard, it specifies that “Overlap each group
of pieces on steel or wood convex brackets, concave face facing downward”.
In order to prevent deformation of pieces during transport, the pieces with the
same or similar curvature shall be combined into one group. Grouping shall not
be too few. The convex portion of bracket is as close as possible to curvature
of flap.
7 About packing for transport of vessels that have special requirements
“Vessels that have special requirements” mentioned here include vessels that
are made of stainless steel, non-ferrous metal and its alloy; vessels of particular
structure such as multiple layers or hot housing or flat steel strips. In 4.5 of this
Standard, it specifies special requirements for packing for transport of above
8 About packing for transport of documentary data
Supplementary statement on matters related to the
standard of reference
To standard’s users:
Thank you for using standards that are under the jurisdiction of National
Technical Committee on Boilers and Pressure Vessels of Standardization
Administration of China. For standard content, development and revision,
interpretation and feedback, the supplementary statement is as follows.
1 Content
Standard content generally includes mandatory requirements, special disabling
regulations, and recommended guidelines. Recommended guidelines are not
mandatory. It shall be noted that standards are not necessary and are not
possible to regulate all aspects of their scope. Therefore, aspects that are not
regulated shall not be banned. Standards are different from manuals.
Standards cannot replace the role of training, experience and technical
identification. But experience and technical identification cannot be used to
deny mandatory requirements and special prohibitions.
2 Formulation and revision
Suggestions on the formulation and revision of national and industrial standards
for boiler and pressure vessels shall be directly submitted to Secretariat of
National Technical Committee on Boilers and Pressure Vessels of
Standardization Administration of China. It shall be decided by the Committee
whether to report to the relevant government authorities. In addition to the
procedures prescribed by the relevant government authorities that shall be
obeyed, the committee adopts a proposal review system for the formulation and
revision of the standard of reference. The standard case is a form of rapid
response of the Committee to technological progress.
3 Interpretation
Only National Technical Committee on Boilers and Pressure Vessels of
Standardization Administration of China has the right to formally interpret the
standard of reference. Application for standard interpretation shall be submitted
to the Secretariat in writing. The inquirer is obliged to provide as detailed and
comprehensive information as possible. Enquiries that are not directly related
to standard terms or that cannot be understood are considered to be part of
technical advice. The Committee has the right to refuse to answer or agree to
provide paid services.

Standard ID JB/T 4711-2003 (JB/T4711-2003)
Description (Translated English) Coating and packing for pressure vessels transport
Sector / Industry Mechanical & Machinery Industry Standard (Recommended)
Classification of Chinese Standard J74
Word Count Estimation 17,188
Date of Issue 2003-03-17
Date of Implementation 2003-07-01
Older Standard (superseded by this standard) JB 2536-1980
Quoted Standard GB 146.1-1983; GB 146.2-1983; GB 191-2000; GB/T 197-1981; GB/T 8923-1988
Drafting Organization Hefei General Machinery Research Institute
Administrative Organization National Standardization Technical Committee Boiler and Pressure Vessel
Regulation (derived from) State-Economy-Trading Announcement No. 32 of 2003
Summary This standard specifies pressure vessels, parts coated with transport packaging the requirements. Pressure vessel components coated with transport packaging shall meet the standards provisions, shall comply with the design the technical requirements.