SSPC-SP 7-2000

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SSPC-SP 7/NACE No. 4

September 1, 2000

Joint Surface Preparation Standard

SSPC-SP 7/NACE NO. 4

Brush-Off Blast Cleaning

This SSPC: The Society for Protective Coatings and

NACE International standard represents a consensus of

those individual members who have reviewed this docu-

ment, its scope and provisions. Its acceptance does not in

any respect preclude anyone, having adopted the standard

or not, from manufacturing, marketing, purchasing, or using

products, processes, or procedures not in conformance with

this standard. Nothing contained in this standard is to be

construed as granting any right, by implication or otherwise,

to manufacture, sell, or use in connection with any method,

apparatus, or product covered by Letters Patent, or as

indemnifying or protecting anyone against liability for in-

fringement of Letters Patent. This standard represents

minimum requirements and should in no way be interpreted

as a restriction on the use of better procedures or materials.

Neither is this standard intended to apply in all cases

relating to the subject. Unpredictable circumstances may

negate the usefulness of this standard in specific instances.

SSPC and NACE assume no responsibility for the interpre-

tation or use of this standard by other parties and accept

responsibility for only those official interpretations issued by

SSPC or NACE in accordance with their respective govern-

ing procedures and policies, which preclude the issuance of

interpretations by individual volunteers.

Users of this standard are responsible for reviewing

appropriate health, safety, and regulatory documents and

for determining their applicability in relation to this standard

prior to its use. This SSPC/NACE standard may not neces-

sarily address all potential health and safety problems or

environmental hazards associated with the use of materials,

equipment and/or operations detailed or referred to within

this standard. Users of this standard are also responsible for

establishing appropriate health, safety, and environmental

protection practices, in consultation with appropriate regu-

latory authorities, if necessary, to achieve compliance with

any existing applicable regulatory requirements prior to the

use of this standard.

CAUTIONARY NOTICE: SSPC/NACE standards are

subject to periodic review and may be revised or withdrawn

at any time without prior notice. SSPC and NACE require

that action be taken to reaffirm, revise, or withdraw this

standard no later than five years from the date of initial

publication. The user is cautioned to obtain the latest

edition. Purchasers may receive current information on all

standards and other publications by contacting the organi-

zations at the addresses below:

©NACE International

P.O. Box 218340

Houston, TX 77218-8340

(telephone +1 281/228-6200)

©SSPC: The Society for Protective Coatings

40 24th Street, Sixth Floor

Pittsburgh, PA 15222

(telephone +1 412/281-2331)

Foreword

This joint standard covers the use of blast cleaning

abrasives to achieve a defined degree of cleaning of steel

surfaces prior to the application of a protective coating or

lining system. This standard is intended for use by coating

or lining specifiers, applicators, inspectors, or others whose

responsibility it may be to define a standard degree of

surface cleanliness.

The focus of this standard is brush-off blast cleaning.

White metal blast cleaning, near-white blast cleaning, com-

mercial blast cleaning, and industrial blast cleaning are

addressed in separate standards.

Brush-off blast cleaning provides a lesser degree of

cleaning than industrial blast cleaning (SSPC-SP 14/NACE

No. 8). The difference between an industrial blast and a

brush-off blast is that the objective of a brush-off blast is to

allow as much of an existing coating to remain as possible,

and to roughen the surface prior to coating application while

the purpose of the industrial blast is to remove most of the

coating, mill scale and rust, when the extra effort required to

remove every trace of these is determined to be unwar-

ranted.

This joint standard was prepared by the SSPC/NACE

Task Group A on Surface Preparation by Abrasive Blast

Cleaning. This joint Task Group includes members of both

the SSPC Surface Preparation Committee and the NACE

Unit Committee T-6G on Surface Preparation.

1. General

1.1 This joint standard covers the requirements for

brush-off blast cleaning of unpainted or painted steel sur-

faces by the use of abrasives. These requirements include

the end condition of the surface and materials and proce-

dures necessary to achieve and verify the end condition.

SSPC-SP 7/NACE No. 4

September 1, 2000

1.2 This joint standard allows tightly adherent rust, mill

scale and/or old coating to remain on the surface.

1.3 The mandatory requirements are described in Sec-

tions 1 to 9 as follows:

Section 1 General

Section 2 Definitions

Section 3 References

Section 4 Procedures Before Blast Cleaning

Section 5 Blast Cleaning Methods and Operation

Section 6 Blast Cleaning Abrasives

Section 7 Procedures Following Blast Cleaning and

Immediately Prior to Coating

Section 8 Inspection

Section 9 Safety and Environmental Requirements

NOTE: Section 10, “Comments” and Appendix A, “Explana-

tory Notes” are not mandatory requirements of this stan-

dard.

2. Definition

2.1 A brush-off blast cleaned surface, when viewed

without magnification, shall be free of all visible oil, grease,

dirt, dust, loose mill scale, loose rust, and loose coating.

Tightly adherent mill scale, rust, and coating may remain on

the surface. Mill scale, rust, and coating are considered

tightly adherent if they cannot be removed by lifting with a

dull putty knife after abrasive blast cleaning has been

performed.

2.2 The entire surface shall be subjected to the abrasive

blast. The remaining mill scale, rust, or coating shall be tight.

Flecks of the underlying steel need not be exposed when-

ever the original substrate consists of intact coating.

2.3 When a coating is specified, the surface shall be

roughened to a degree suitable for the specified coating

system.

2.4 Immediately prior to coating application, the entire

surface shall comply with the degree of cleaning as speci-

fied herein.

2.5 Visual standards or comparators may be specified

to supplement the written definition. In any dispute, the

written standards shall take precedence over visual stan-

dards and comparators. Additional information on visual

standards is available in Section A.4 of Appendix A.

3. References

3.1 The documents referenced in this standard are

listed in Section 3.4.

3.2 The latest issue, revision, or amendment of the

referenced standards in effect on the date of invitation to bid

shall govern unless otherwise specified.

3.3 If there is a conflict between the requirements of any

of the cited reference standards and this standard, the

requirements of this standard shall prevail.

3.4 SSPC: THE SOCIETY FOR PROTECTIVE COAT-

INGS STANDARDS:

AB 1 Mineral and Slag Abrasives

AB 2 Cleanliness of Recycled Ferrous Metallic

Abrasives

AB 3 Newly Manufactured or Re-Manufactured

Steel Abrasives

PA Guide 3 A Guide to Safety in Paint Application

SP 1 Solvent Cleaning

VIS 1-89 Visual Standard for Abrasive Blast Cleaned

Steel

4. Procedures Before Blast Cleaning

4.1 Before blast cleaning, visible deposits of oil, grease,

or other contaminants shall be removed in accordance with

SSPC-SP 1 or other agreed upon methods.

4.2 Before blast cleaning, surface imperfections such

as sharp fins, sharp edges, weld spatter, or burning slag

should be removed from the surface to the extent required

by the procurement documents (project specification). Ad-

ditional information on surface imperfections is available in

Section A.5 of Appendix A.

4.3 If a visual standard or comparator is specified to

supplement the written standard, the condition of the steel

prior to blast cleaning should be determined before the

blasting commences. Additional information on visual stan-

dards and comparators is available in Section A.4 of Appen-

dix A.

5. Blast Cleaning Methods and Operation

5.1 Clean, dry compressed air shall be used for nozzle

blasting. Moisture separators, oil separators, traps, or other

equipment may be necessary to achieve this requirement.

5.2 Any of the following methods of surface preparation

may be used to achieve a brush-off blast cleaned surface:

5.2.1 Dry abrasive blasting using compressed air, blast

nozzles, and abrasive.

5.2.2 Dry abrasive blasting using a closed-cycle, recir-

culating abrasive system with compressed air, blast nozzle,

SSPC-SP 7/NACE No. 4

September 1, 2000

and abrasive, with or without vacuum for dust and abrasive

recovery.

5.2.3 Dry abrasive blasting using a closed cycle,

recirculating abrasive system with centrifugal wheels and

abrasive.

5.3 Other methods of surface preparation (such as wet

abrasive blasting) may be used to achieve a brush-off blast

cleaned surface by mutual agreement between those re-

sponsible for performing the work and those responsible for

establishing the requirements. NOTE: Information on the

use of inhibitors to prevent the formation of rust immediately

after wet blast cleaning is contained in Section A.9 of

Appendix A.

6. Blast Cleaning Abrasives

6.1 The selection of abrasive size and type shall be

based on the type, grade, and surface condition of the steel

to be cleaned, type of blast cleaning system employed, the

finished surface to be produced (cleanliness and rough-

ness), and whether the abrasive will be recycled.

6.2 The cleanliness and size of recycled abrasives shall

be maintained to ensure compliance with this specification.

6.3 The blast cleaning abrasive shall be dry and free

of oil, grease, and other contaminants as determined by the

test methods found in SSPC-AB 1, AB 2 and AB 3.

6.4 Any limitations on the use of specific abrasives, the

quantity of contaminants, or the degree of allowable embed-

ment shall be included in the procurement documents (project

specification) covering the work, because abrasive embed-

ment and abrasives containing contaminants may not be

acceptable for some service requirements. NOTE: Addi-

tional information on abrasive selection is given in Section

A.2 of Appendix A.

7. Procedures Following Blast Cleaning and

Immediately Prior to Coating

7.1 Visible deposits of oil, grease, or other contami-

nants shall be removed according to SSPC-SP 1 or another

method agreed upon by those parties responsible for estab-

lishing the requirements and those responsible for perform-

ing the work.

7.2 Dust and loose residues shall be removed from

prepared surfaces by brushing, blowing off with clean, dry

air, vacuum cleaning, or other methods agreed upon by

those responsible for establishing the requirements and

those responsible for performing the work. NOTE: The

presence of toxic metals in the abrasives or paint being

removed may place restrictions on the methods of cleaning

permitted. The method chosen shall comply with all appli-

cable regulations. Moisture separators, oil separators, traps,

or other equipment may be necessary to achieve clean, dry

air.

7.3 After blast cleaning, surface imperfections that

remain (e.g., sharp fins, sharp edges, weld spatter, burning

slag, scabs, slivers, etc.) shall be removed to the extent

required in the procurement documents (project specifica-

tion). Any damage to the surface profile resulting from the

removal of surface imperfections shall be corrected to meet

the requirements of Section 2.4. NOTE: Additional infor-

mation on surface imperfections is contained in Section A.5

of Appendix A.

8. Inspection

8.1 Work and materials supplied under this standard

are subject to inspection by a representative of those re-

sponsible for establishing the requirements. Materials and

work areas shall be accessible to the inspector. The proce-

dures and times of inspection shall be as agreed upon by

those responsible for establishing the requirements and

those responsible for performing the work.

8.2 Conditions not complying with this standard shall be

corrected. In the case of a dispute, an arbitration or settle-

ment procedure established in the procurement documents

(project specification) shall be followed. If no arbitration or

settlement procedure is established, then a procedure mu-

tually agreeable to purchaser and supplier shall be used.

8.3 The procurement documents (project specification)

should establish the responsibility for inspection and for any

required affidavit certifying compliance with the specifica-

tion.

9. Safety and Environmental Requirements

9.1 Because abrasive blast cleaning is a hazardous

operation, all work shall be conducted in compliance with

applicable occupational and environmental health and safety

rules and regulations. NOTE: SSPC-PA Guide 3, “A Guide

to Safety in Paint Application,” addresses safety concerns

for coating work.

10. Comments

10.1 Additional information and data relative to this

standard are contained in Appendix A. Detailed information

and data are presented in a separate document, SSPC-SP

COM, “Surface Preparation Commentary.” The recommen-

dations contained in Appendix A and SSPC-SP COM are

believed to represent good practice, but are not to be

considered requirements of the standard. The sections of

SSPC-SP COM that discuss subjects related to brush-off

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摘要：

SSPC-SP 7-2000（又称NACE No. 4）是美国钢结构涂装协会（SSPC）发布的钢材表面刷涂（Brush-Off Blast Cleaning）标准规范，适用于在需要中等程度清洁但保留部分附着牢固的旧涂层、锈蚀和氧化皮的情况下进行表面预处理。该标准要求使用磨料喷射清理，去除松散杂质、锈渣、氧化皮和松散涂层，使表面呈现均匀的灰色金属外观，但允许保留紧密附着的残留物。SP-7标准在工业防腐、桥梁、储罐及管道涂装项目中被广泛采用，作为经济高效的表面处理方案，尤其适用于环境要求不极端或涂装

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SSPC-SP 7-2000

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