Solvent Cleaning SSPC-SP1 Definition: Solvents such as water, mineral spirits, xylol, toluol etc., are used to remove solvent-soluble foreign matter from the. The basic standards for preparing metal substrates are a joint effort between the for Protective Coatings (SSPC) and the National Association of Corrosion. Oct 1, SSPC coating material standards contain requirements for the performance of various types of coatings when tested in accordance with.
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SSPC STANDARDS. DEVELOPMENT. MANUAL. 40 24th Street, 6th Floor. Pittsburgh PA Version 9. March 7, New or Revised SSPC Standards. - Present. This page contains a list of SSPC standards either new or updated from to the present. For a list of all. How to Get Standards. SSPC Members. SSPC members can download standards for free as a benefit of membership. To download a standard: Login to your.
NOTE: The presence abrasive system with compressed air, blast nozzle, and of toxic metals in the abrasives or paint being removed abrasive, with or without vacuum for dust and abrasive may place restrictions on the methods of cleaning recovery.
Comply with all applicable regulations. Moisture separators, oil separators, traps, or other equipment may 5.
Any parties responsible for establishing the requirements and damage to the surface profile resulting from the removal of those responsible for performing the work. NOTE: Informa- surface imperfections shall be corrected to meet the tion on the use of inhibitors to prevent the formation of rust requirements of Section 2. NOTE: Additional infor- immediately after wet blast cleaning is contained in mation on surface imperfections is contained in Section A.
Blast Cleaning Abrasives blast cleaning shall be removed by recleaning the rusted areas to meet the requirements of this standard before 6.
NOTE: Information on rust-back re-rust- ing and the type, grade, and surface condition of the steel to be surface condensation is contained in Sections A.
Inspection 6. Materials and 6. In the case of a dispute, an arbitration or settle- specification covering the work, because abrasive embed- ment procedure established in the procurement documents ment and abrasives containing contaminants may not be project specification shall be followed. If no arbitration or acceptable for some service requirements.
NOTE: Addi- settlement procedure is established, then a procedure mu- tional information on abrasive selection is given in Section tually agreeable to downloadr and supplier shall be used. While normally such embedment or residues tion. Safety and Environmental Requirements soluble, solvent-soluble, acid-soluble, or other soluble contaminants particularly if the prepared steel is to be 9.
Comments A. Large particle sized abrasives particularly metal- blast cleaning are listed below. Accordingly, Subject Commentary Section it is recommended that the use of larger abrasives be avoided in these cases. However, larger abrasives may be Abrasive Selection If control of profile Wet Abrasive Blast Cleaning Typical profile heights Surface Profile It should be used when a high degree of blast for Abrasive Blast Cleaned Steel provides color cleaning is required.
The primary functions of blast photographs for the various grades of surface preparation cleaning before coating are: a to remove material from as a function of the initial condition of the steel. The series the surface that can cause early failure of the coating A-SP 10, B-SP 10, C-SP 10 and D-SP 10 photographs system and b to obtain a suitable surface roughness and depict surfaces cleaned to a near-white blast grade.
Other to enhance the adhesion of the new coating system. Coatings tend to pull away from sharp edges and A.
It is important to projections, leaving little or no coating to protect the under- tion should be removed prior to coating see Section A. Other features that are difficult to properly cover and protect include crevices, weld porosities,A.
The high cost of the methods to remedy colder than the dew point of the surrounding air. It is, surface imperfections requires weighing the benefits of therefore, recommended that the temperature of the steel edge round- ing, weld spatter removal, etc. It is advisable to visually Poorly adhering contaminants, such as weld slag resi- inspect for moisture and periodically check the surface dues, loose weld spatter, and some minor surface lamina- temperature and dew point during blast cleaning tions may be removed during the blast cleaning operation.
Therefore, proper plan- A. Clean water timing of the repairs may occur before, during, or after the should be used for rinsing. Some gages can the first 1O0 mz 1,ft2 shall be measured as stated in Section be adjusted to read accurately in a given range. Adjust the gage 5. Then check the gage on increment thereof, one 10 m2 f t 2 area shall be randomly standards of higher and lower thicknesses to establish the range selected and measured.
Notes see Sections 5. If a the magnetic surface of the steel and the small rounded tip of the maximum thickness value is not explicitly specified, the speci- magnet or probe that restson the top surface of the coating. This fied thickness shall be the minimum. Such correction measurements for each 10 m2 ft2 area shall not be less is described in Section 4. No single spot measure- instructions for Type 2 gages. Any gagereading may under-run 8. If the average of the spot measurements nism to measure the force needed to pull a small permanent for a given 1O m2 1O0 ft2 area meets or exceeds the specified magnetfrom the surface of thecoated steel.
See Appendix 1. Internal balancing 5. Nosingle spot measure- recalibrate when changing orientation. Any gage reading may over-run sures the force necessaryto pull the permanent magnet from the by a greater amount.
If the average of the spot measurements surface. Because of gravitational effects, these gages must be for a given 1O m2 1O0 ft2 area meets or falls below the specified recalibrated when the orientation of the surface changes; e. Some gages have three measurements may be made to define the non-conforming separate indicators which compensate for horizontal, vertical area.
Type 1B gages are generally not as if higher maximum thickness readings are allowable under precise as Type 1A gages. Normally, Type 1 gages are not adjusted or reset for each new series of measurements.
Such shims are usually fairly rigid and curved and do not lie perfectly 6. Accuracy flat, even on a smooth steel test surface. Near the pull-off point 6. Forthicknesses less than 25 pm frequently springs back from the steel surface, raising the 1 mil , the gage must have an accuracy at least within e.
Some Type 2 gages use a 7. Disclaimer permanent magnet. Whenthe magnet is brought near steel, the 7. By information furnished in SSPC standards and specifications is measuring this change in flux density,which varies inversely to as accurate, complete and useful as possible, SSPC cannot the distance between the magnet and the steel substrate, the assume responsibility nor incur any obligation resulting from the coating thickness can be determined.
Hall elements and mag- use of any materials, coatings or methods specified therein, or net resistance elements are the most common ways to measure of the specification or standard itself. However, the response of these ele- ments is temperature dependent, so temperature compensation is required. A coil containing a soft iron rod is energized with an 8. As with a permanent magnet, the magnetic flux density the presence of another mass of steel close to the body of the within the rod increases when the probe is brought near the steel gage.
This effect may extend as much as three inches 7.
This change is easy to detect by using a second coil. The output of the second coil isrelated to coating thickness and this relationship can be determined experimentally. If the curvature 8. Repeated gage readings on a rough surface, even at points very close 8. Also, residual either a rough or a smooth uncoated steel surface. If the steel is roughened, as by blast cleaning, positions be averaged.
With a correctly calibrated and 8. Somegagesfunction well at much highertemperatures. Most electronic gages compensate for coating and the probe of the gage must be free from dust, grease temperature differences among the gage, probe and surface. When is tacky or excessively soft. Tacky coating films also cause these gages are set up for calibration or measurement of coating unwanted adhesion of the magnet.
Unusually soft films may be films, there should be no apparent vibration. Soft or tacky films can - 8.
Two inspectors using the same gage will not tracting shim thickness. Magnetic particles adhering to allow for this natural fluctuation, an individual spot measure- ment is permitted to be below the specified minimum thickness the probe can be removed using an adhesive backed tape.
Any adhesive residue left on the probe must then be removed. Similar reasoning applies to maximum most mild low-carbon steels will not significantly effect magnetic thickness. For higher alloy steels, the gage response fied maximum allow for the tolerance of the gage and calibration should bechecked. In any event, the gage should be recalibrated standards and for variations in the substrate. The chrome plated panels are flat smooth steel 2. Thesensitivityto edgeeffectsand 2.
Examples of some NIST discontinuities varies from gage to gage. Measurementscloser standards are: than 2.
Mentally Nonmagnetic Coatingon Steel into three equal parts,each beingabout 1O m2 divide the surface ft2. This 8. Assume the specification calls for 64 pm 2. The average thickness for area A is then minimum specification. This method may be specified in the the average of the five spot measurements made on area A, procurementdocuments,mayfollowmanufacturer's instruc- namely 66 pm 2.
Spot 1 64 pm 2. Therefore, for of the specified minimum thickness. Eighty percentof 64 pmis the gage to be in agreement with the shim, the average thick- 51 pm 0. Ifthe average thicknessmeasured on the 51 pm 2. Eighty percent shim is measured to be pm O mils , the gage calibration of 2. Although 2.
This average measurementof the pm O mils , the calibrationis verified. Checkthatanothershim of intermediate thickness,for [There are individual gage readings of 1. If the calibration mils at spot 3,both of which are clearlyless than 2.