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TitleGS_EP_PVV_175_EN
File Size183.4 KB
Total Pages28
Table of Contents
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	1. Scope
	2. Reference documents
	3. Cleanliness requirements
		3.1 Classification
		3.2 Extent
	4. Main cleaning methods
		4.1 Cleaning with air (blowing or air flushing)
			4.1.1 Continuous blowing of air
			4.1.2 Quick decompression
		4.2 Cleaning with steam
		4.3 Cleaning with water (water flushing)
			4.3.1 Circulation of water
			4.3.2 Water spray
			4.3.3 High pressure water
		4.4 Mechanical cleaning
			4.4.1 Hand cleaning
			4.4.2 Pipe cleaning with pigs
			4.4.3 Sand blasting
		4.5 Chemical cleaning
			4.5.1 Chemical cleaning without further coating
			4.5.2 Chemical cleaning with final protective coating
	5. Selection of an appropriate cleaning method
		5.1 Approval of the cleaning method(s)
		5.2 Guidelines
		5.3 Rules for cleaning method selection
	6. Application to a specific network to be cleaned
	7. Protection of the devices included in the network
	8. Protection of devices in the vicinity of the network
	9. Air flushing
		9.1 Specific problems of air flushing
			9.1.1 High velocities and large flows
			9.1.2 Large volumes of air
			9.1.3 Air flushing is a hazardous operation
			9.1.4 Air quality
		9.2 Guidelines for the preparation of an air flushing
			9.2.1 Definition of the network to be cleaned
			9.2.2 Calculation of the necessary flow rate in the main header
			9.2.3 Application of the requirements to the existing facilities
			9.2.4 Sketch of the network to be cleaned
			9.2.5 If the quick decompression method has been selected, the pressure release can be obtained by:
			9.2.6 Fragile devices to be removed
			9.2.7  Safety
		9.3 Air flushing procedure
			9.3.1 Continuous blowing method
			9.3.2 Quick decompression method
		9.4 Cleanliness criteria
	10.  Cleaning with steam
	11. Water flushing
		11.1 Specific problems of water flushing
		11.2 Guidelines for the preparation of a water flushing
			11.2.1 Definition of the network to be cleaned
			11.2.2 Calculation of the necessary flow in the main header of the network
			11.2.3  Estimate of the maximum head loss
			11.2.4 Application of the requirements to the existing facilities
			11.2.5 Sketch of the network to be cleaned
			11.2.6 Location of water inlets and outlets
			11.2.7 Additional material and pieces of equipment required
			11.2.8 Fragile devices to be removed
			11.2.9  Quality of water
				11.2.9.1 Stainless steel materials (pipes or vessels)
				11.2.9.2 Carbon steel materials (pipes or vessels)
		11.3  Water flushing procedure
		11.4 Particular cases: water systems
	12. Chemical cleaning
		12.1 General
		12.2 Chemical cleaning of carbon steel pipes
			12.2.1 Cold degreasing
			12.2.2 Rinsing
			12.2.3 Cold pickling (ambient temperature)
			12.2.4 Rinsing
			12.2.5 Neutralisation (ambient temperature)
			12.2.6 Blowing
			12.2.7 Re-assembly and oil flushing Reinstall each piping item using new gaskets according to the VENDORS drawings or specifi
		12.3 Chemical cleaning of stainless steel pipes
			12.3.1 Degreasing
			12.3.2 Rinsing
			12.3.3 Cold pickling (at ambient temperature)
			12.3.4 Rinsing
			12.3.5 Passivation
			12.3.6 Final rinsing
			12.3.7 Blowing
			12.3.8  Oil flushing
		12.4 Chemical cleaning of external surface of stainless steel components
			12.4.1.1 Mechanical cleaning
			12.4.1.2 Pickling and passivation using liquids
			12.4.1.3 Pickling and passivation using pastes
		12.5 Staff protection
	13. Quality control
		13.1 During cleaning
		13.2 Inspection after cleaning
	14. Reassembly
	15. Preservation of cleaned systems
	16. Documentation
		16.1 Prior to cleaning operations
		16.2 Cleaning performed by Vendors
		16.3 Cleaning performed at site
		16.4 Flushing performed at site
			GS EP EXP 105 - PRECOMMISSIONING EXECUTION (APPLICABLE)
                        

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