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SSPC-SP 1 solvent cleaning is a specification that the Society for Protective Coatings (SSPC) has placed in order to prevent premature coating failure. This specification is a way to approach surface preparation, which promotes longer coating life on industrial equipment. SSPC-SP1 is a requirement for surface preparation that removes contaminants from steel surfaces. Solvent cleaning is the primary method to remove visible dirt, grease, oil, soil, drawing compounds, as well as, similar organic compounds from steel surfaces.
Why is Solvent Cleaning Important?
SSPC-SP1 is an essential requirement because it is done before surface preparations such as SSPC-SP 10/NACE No. 2 near-white blast cleaning or SSPC-SP 5/NACE No. 1 white metal blast cleaning. Surface preparation is the removal of rust, scale, or paint off steel surfaces.
The process of solvent cleaning entails, solvents of various kinds being used separately or combined to remove the contaminants listed above i.e. grease, oil, soluble salt, etc. Solvents can be directly applied onto the surface, used on scrubbing brushes or rags, or surfaces being immersed in the solvent.
The best way to avoid spreading the contaminants is to use contaminant free solvents for the final steps. The SSPC 1 solvent cleaning sometimes is a contingency plan on coating specification. Some customer requires a chloride test to be performed and if the chloride level was more than 15μg/cm², then is subjected to the solvent cleaning otherwise can be directly subjected to the sand blasting.
What Solvents can be used for SSPC-SP 1 Solvent Cleaning?
SSPC-SP 1 solvent cleaning calls for the use of solvents for cleaning. Solvent cleaning can be done using organic, inorganic, petroleum based, alkaline cleaners, acidic cleaners, and detergents. The solvents for SSPC-SP 1 solvent cleaning should be selected carefully based on the surface material and contaminants that need to be removed from the surface. It is highly recommended that precaution be taken when selecting your solvent. The determination of solvents used for SSPC-SP 1 can be based on environmental temperatures or suggested based on the environment that SSPC-SP 1 will be performed in.
Regardless of which solvent is used caution is always advised. As some solvents are hazardous, safety precautions should be taken when using solvents for SSPC-SP 1. A list of some solvents has been provided below.
Alkaline solvents
- Sodium Hydroxide
- Sodium Carbonate
- Sodium Silicate
- Orthosodium Silicate
- Sodium Phosphate
- Trisodium Phosphate
Detergents
- Household detergents
Petroleum solvents and Turpentine
- Acetone
- Benzene
- Carbon Tetrachloride
- Cyclohexane
- Epichlorohydrin
- Ethyl Acetate
- Ethanol
- Ethylene Dichloride
- Ethylenediamine
- Furfuryl Alcohol
- Methanol
Petroleum solvents and Turpentine cont.
- Methylene Chloride
- VM & P Naphtha
- Perchloroethylene
- Isopropyl Alcohol
- Stoddard Solvent
- Toluene
- Trichloroethylene
- Turpentine
- Xylene
Emulsion
Cleaners normally consist of oil-soluble soaps or other agents that contain kerosene or mineral spirits. Take note some solvents can be combined, and all solvents should be used under special care due to their hazardous nature.
Procedure
In order to successfully follow SSPC-SP 1, you have to take steps prior and post this requirement to complete the specification of solvent cleaning.
Prior to performing solvent cleaning, it is best if dust is removed from the surface of interest. The removal of dust prior to applying SSPC-SP 1 solvent cleaning is done by using a stiff wire brush against the surface. If necessary, applying solvents appropriate for removing dust is acceptable as long as it is rinsed off with fresh water prior to solvent cleaning.
Remove all contaminants from the surface with a scraper and then apply any of the methods listed below:
- Use a rag or brush with solvent to wipe or scrub off the remaining contaminants
- Spray surface with solvent
- Fully immerse surface into solvent
- Use emulsion or alkaline cleaners
- Use detergents or cleaners to steam clean
Take caution on all methods listed to remove the final contaminants. Be sure to use clean rags, brushes, solvent spray, and solvents for the final steps for each method used. For emulsion, alkaline cleaners, and steam be sure to finish the method by cleaning the surface with fresh water or steam.
Just as important as pre-solvent cleaning, post-solvent cleaning is just as important as the step following solvent cleaning.
Post solvent cleaning, it is very important to remove all remaining residue on the surface. This is best done by using any of the accepted methods listed.
- Blow off with clean dry air
- Brush off
- Vacuum cleaning
What is next?
With the completion of SSPC-SP 1 solvent cleaning, any surface preparation method can be performed depending on the project specification i.e. SSPC 10 or SSPC 5.
Return to Coating Inspection
Executive Summary & Industrial Inspection Scope
In demanding industrial environments across Oil, Gas, Petrochemical, Offshore, and Heavy Process Infrastructure, rigorous compliance with SSPC-PA 2, NACE SP0188, ISO 8501-1, ASTM D4285 is essential to ensure operational integrity, personnel safety, and compliance with statutory regulatory frameworks. This technical specification provides QA/QC managers, procurement engineers, welding inspectors, and third-party inspection (TPI) agencies with an authoritative, field-tested guideline for “SSPC Sp 1 Solvent Cleaning”.
Ensuring compliance regarding sspc sp 1 solvent cleaning minimizes the risk of catastrophic asset failures, costly unscheduled shutdowns, and supplier non-conformances. The following technical sections delineate the scope of inspection, mandatory verification protocols, acceptance criteria, documentation deliverables, and root cause mitigation strategies.
Governing International Engineering Codes & Specifications
Verification and validation of SSPC Sp 1 Solvent Cleaning must strictly conform to the latest editions of the following international engineering codes and project specifications:
• **Primary Standard Reference:** SSPC-PA 2, NACE SP0188, ISO 8501-1, ASTM D4285
• **Quality Management & Inspection Systems:** ISO 9001:2015 & ISO/IEC 17020 (Requirements for the operation of various types of bodies performing inspection)
• **Material Compliance & Traceability:** EN 10204 Type 3.1 / 3.2 Inspection Certificates for metallic and non-metallic pressure-retaining components
• **Personnel Qualification:** ASNT SNT-TC-1A / ISO 9712 for NDT personnel, CSWIP 3.1 / AWS CWI for welding inspection, and NACE / AMPP Level 2/3 for coating and corrosion personnel
• **Statutory & Health Safety Directives:** ASME Boiler & Pressure Vessel Code (BPVC), API Standards, OSHA, and regional local authority regulations.
Step-by-Step Quality Control & Inspection Procedure
The execution of quality surveillance for SSPC Sp 1 Solvent Cleaning is structured across four progressive QA/QC intervention phases:
Stage 1: Pre-Inspection & Engineering Document Review (Review Point – R)
Prior to commencement of any physical activities or manufacturing operations related to SSPC Sp 1 Solvent Cleaning, the contractor or vendor must submit all technical submittals to the Owner or TPI agency for formal review and approval.
- Verification of approved Inspection and Test Plan (ITP) identifying all Hold (H), Witness (W), Review (R), and Surveillance (S) intervention points.
- Cross-examination of Material Test Reports (MTR / Mill Certificates) against standard design specifications (SSPC-PA 2, NACE SP0188, ISO 8501-1, ASTM D4285).
- Review and approval of specific Procedure Qualification Records (PQR), Welding Procedure Specifications (WPS), or calibration certificates.
- Verification that all measurement instruments, gauges, and NDT equipment hold valid calibration certificates from ISO/IEC 17025 accredited calibration laboratories (within 6 to 12 months validity).
Stage 2: In-Process Witnessing & Fabrication Control (Witness / Hold Point – W/H)
During the active execution phase, the certified inspector performs physical surveillance to ensure strict adherence to certified drawings, manufacturing procedures, and code tolerances.
- Verification of material traceability (heat number, heat treatment lot, plate number) transferred accurately onto fabricated components.
- Dimensional verification and visual inspection using calibrated gauges, micrometer depth dials, or laser alignment systems.
- Monitoring ambient environmental parameters (relative humidity, dew point, substrate temperature) when applying surface treatments, welding preheat, or pressure testing.
- Witnessing non-destructive examination (RT, UT, MT, PT, PMI) at specified percentages according to project critical rating and code requirements.
Stage 3: Final Acceptance, Pressure/Performance Testing & Marking (Hold Point – H)
The culminating milestone where the fully assembled or completed item is subjected to definitive acceptance tests in the presence of the Owner’s Third-Party Inspector (TPI).
- Execution of pressure proof tests (Hydrostatic at 1.3x to 1.5x MAWP or Pneumatic test) with dual calibrated pressure gauges and temperature recorders.
- Full visual inspection of completed surfaces, welds, protective coatings, and flange contact faces for absence of mechanical damage or code defects.
- Validation of permanent stamping, low-stress die markings, nameplate data verification, and barcoding in strict conformity with project specs.
- Clearing all open punch-list items, non-conformance reports (NCRs), and concession requests prior to issuance of the release note.
Stage 4: Packing, Preservation & Inspection Release (Inspection Release Certificate – IRC)
Ensuring the inspected equipment is adequately protected against atmospheric corrosion, mechanical shock, and marine transit degradation.
- Inspection of rust preventative coatings, desiccant bags, flange face blind protectors, and vapor corrosion inhibitor (VCI) packaging.
- Verification of heavy-lift sea fastening lugs, center-of-gravity markings, and export crating compliance (ISPM 15 wooden crating).
- Compilation and signing of the final Inspection Release Certificate (IRC / Shipping Release) and manufacturer data dossier (MDR).
Technical Acceptance Criteria & Tolerances Matrix
All measurements and physical characteristics must comply with the engineering tolerances and acceptance thresholds tabulated below:
| Surface & Coating Parameter | Governing Standard | Acceptance Criteria / Specified Limit | Test Instrument / Method | QC Intervention |
|---|---|---|---|---|
| Solvent Cleaning & Degreasing | SSPC-SP 1 | Complete removal of visible oil, grease, soil, drawing and cutting compounds | UV Light Inspection / Solvent Wipe Test | Witness (W) |
| Abrasive Blast Cleanliness Degree | SSPC-SP 10 / NACE No. 2 (Near-White) | Random staining shall not exceed 5% of each unit area of surface (95% bare clean metal) | ISO 8501-1 Pictorial Standards / SSPC-VIS 1 | Hold (H) |
| Surface Profile Depth (Roughness) | ASTM D4417 Method C / NACE SP0287 | Anchor pattern depth between 50 µm and 85 µm (or per coating spec sheet) | Coarse/X-Coarse Replica Tape (Press-O-Film) & Micrometer | Hold (H) |
| Soluble Salt Contamination (Chlorides) | ISO 8502-6 & ISO 8502-9 (Bresle Method) | Maximum allowable chloride concentration ≤ 20 mg/m² (or ≤ 3 µg/cm² for offshore) | Bresle Patch & Calibrated Conductivity Meter | Witness (W) |
| Dry Film Thickness (DFT) Verification | SSPC-PA 2 / ISO 2808 | 80/20 Rule: No spot reading <80% of nominal; average of spots within specified range | Calibrated Type 2 Electronic Magnetic Gauge | Hold (H) |
| Coating Adhesion (Cross-Cut / Pull-Off) | ASTM D3359 (X-Cut) / ASTM D4541 (Pull-Off) | Adhesion rating 4A/5A or minimum tensile pull-off strength ≥ 7.0 MPa (1000 psi) | Hydraulic Dolly Pull-Off Adhesion Tester | Witness (W) |
Mandatory QA/QC Dossier & Inspection Deliverables
Prior to the final issuance of the Inspection Release Certificate (IRC), the contractor and vendor must compile and submit the verified manufacturer data record containing:
- Approved Inspection & Test Plan (ITP) with sign-off stamps by Contractor, Client, and TPI.
- Material Test Reports (MTR / Mill Test Certificates EN 10204 Type 3.1 or 3.2).
- Certified Welding Procedure Specifications (WPS), Procedure Qualification Records (PQR), and Welder Performance Qualifications (WPQ).
- Calibration Certificates for all test instruments and measuring equipment (NABL / ISO 17025 accredited).
- Non-Destructive Examination Reports (RT, UT, MT, PT, PMI, Ferrite Content) evaluated by Level II/III inspectors.
- Heat Treatment & PWHT Time-Temperature Recorder Charts with thermocouple layout drawings.
- Hydrostatic / Pneumatic Pressure Proof Test Certificate with calibrated chart recorder logs.
- Surface Preparation and Protective Coating Inspection Reports (Daily environmental log, blast profile, DFT summary).
- Non-Conformance Report (NCR) and Concession Disposition Closeout Log.
- Official Inspection Release Certificate (IRC / Shipping Release Note) permitting packing and dispatch.
Common Non-Conformances & Field Mitigation Strategies
Based on extensive third-party inspection field records in oil & gas projects, the following deviations require heightened surveillance:
Defect / Hazard: Material Grade Substitution & Lack of Heat Traceability
Root Cause: Uncontrolled workshop storage, missing color coding, or unverified supplier sub-tier procurement without EN 10204 3.1 documentation.
Preventative Action: Enforce strict 100% Positive Material Identification (PMI) prior to cutting, and mandatory material receiving inspection with physical stamping cross-referenced to original mill test certificates.
Defect / Hazard: Out-of-Tolerance Fit-Up & Alignment Mismatch
Root Cause: Poor thermal cutting, thermal distortion from excessive preheat, or inadequate jigging and tacking arrangements.
Preventative Action: Establish a mandatory Witness/Hold point at joint fit-up before root pass deposition. Use calibrated Hi-Lo gauges to verify bevel angle, root face, and root gap according to the qualified WPS.
Defect / Hazard: Premature Coating Delamination & Blistering Under Film
Root Cause: Excessive soluble salt contamination (>20 mg/m²) left on the substrate, blast cleaning below dew point (<3°C above dew point), or oil/moisture in the blasting compressor air line.
Preventative Action: Perform Blotter Test (ASTM D4285) daily on compressed air, enforce Bresle patch chloride testing, and apply primer within 4 hours of abrasive blasting before rust blooming initiates.
Defect / Hazard: Pressure Drop During Final Hydrostatic Proof Testing
Root Cause: Micro-leakage through temporary test flange gaskets, entrapped air pockets inside vessel high points, or inadequate temperature stabilization.
Preventative Action: Ensure thorough venting at all high-point vents until bubble-free fluid emerges, allow minimum 15-minute temperature stabilization between filling medium and ambient metal, and torque all blind flanges with calibrated torque wrenches.
Frequently Asked Questions (FAQ)
Q: What are the mandatory qualifications for inspectors verifying SSPC Sp 1 Solvent Cleaning?
A: Inspectors must hold recognized international certifications applicable to the discipline. For welding and fabrication: CSWIP 3.1/3.2, AWS CWI, or API 510/570 Source Inspector. For NDT: ISO 9712 or ASNT SNT-TC-1A Level II minimum. For coatings: NACE / AMPP Level 2 or FROSIO Level III. Additionally, the inspection agency must operate under an ISO/IEC 17020 accredited quality management system.
Q: How does PtroTek resolve non-conformances (NCRs) encountered during vendor surveillance?
A: When a deviation from certified drawings or SSPC-PA 2, NACE SP0188, ISO 8501-1, ASTM D4285 is detected, the inspector issues a formal Non-Conformance Report (NCR) within 24 hours. The vendor must submit a Root Cause Analysis (RCA) and proposed disposition (Rework, Repair, or Concession). Work on the affected component is halted (Hold Point) until the Owner’s engineering authority approves the disposition and a re-inspection confirms full compliance.
Q: What is the difference between Witness (W) and Hold (H) points in an Inspection & Test Plan (ITP)?
A: A Hold Point (H) is a mandatory milestone where fabrication or testing CANNOT proceed without the physical presence of the designated client or third-party inspector. Written clearance or stamping is strictly required. A Witness Point (W) requires prior notification (typically 24 to 48 hours) to the inspector; however, if the inspector fails to attend at the scheduled time, fabrication or testing may proceed with subsequent review of the test records.
Q: Can international clients review inspection reports and photos in real time?
A: Yes. PtroTek provides comprehensive Flash Reports issued within 24 hours of inspection completion, followed by detailed formal inspection reports accompanied by high-resolution calibrated photographic evidence, dimension logs, and signed vendor test records for complete global transparency.
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