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Industrial Pipeline Degreasing Process
Industrial Pipeline Degreasing Process
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- Time of issue:2015-05-22 11:10
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(Summary description)This standard applies to metal pressure piping engineering design documents, must be degreased oil pipe, pipe fittings, valves, gaskets, fasteners and other piping components and instrumentation degreasing construction.
Industrial Pipeline Degreasing Process
(Summary description)This standard applies to metal pressure piping engineering design documents, must be degreased oil pipe, pipe fittings, valves, gaskets, fasteners and other piping components and instrumentation degreasing construction.
- Categories:Company News
- Author:
- Origin:
- Time of issue:2015-05-22 11:10
- Views:
Industrial Pipeline Degreasing Process
1 range
This standard applies to metal pressure piping engineering design documents, must be degreased oil pipe, pipe fittings, valves, gaskets, fasteners and other piping components and instrumentation degreasing construction.
2 normative reference documents
The provisions in the following documents become the provisions of these rules by reference. All dated reference documents and their subsequent revisions (excluding errata), or whether or not this procedure should be applied, shall be determined by the preparation of the specialized department after the study. The latest version of the undated reference document applies to this specification.
GB20801-2006 "Pressure piping tables - Industrial piping
GB 97-50235 Specification for the Construction and Acceptance of Industrial Metal Piping Projects
SH / T3517-2001 "Technical Specification for the Construction of Petroleum and Chemical Pipeline Engineering Steel Pipe Engineering
SH3501-2002 Standard for Construction and Acceptance of Petrochemical Toxic and Flammable Media Pipelines
HG20202-2002 "Construction and acceptance of degreasing works"
3 Construction preparation
3.1 Material requirements
3.1.1 When a design is provided, the design shall be based on the design of the fatting agent to be used. When not specified in the design, it is preferable to use industrial trichloroethylene as the degreasing agent, considering safety and degreasing effectiveness. A range of commonly used degreasers may also be listed in Table 1, depending on customer requirements or for other reasons.
3.1.2 Alkaline degreasing fluids are listed in Table 2, Table 3 for preparation and use; emulsions (see Table 4) and steam are also available.
3.1.3 Chemicals used as fat absorbers or for detergents should have a qualified manual.
3.2 Construction equipment and tools
3.2.1 Equipment: acid-resistant pumps, temporary pipes, etc.
3.2.2 Tools: plastic buckets, basins, brushes and necessary labor protection materials.
3.2.3 Tools: solvent tanks (which can be made from stainless steel pipes), fittings for connecting temporary lines, valves and cleaning lines.
3.2.4 Portable Fluorescence Detector, White Paper.
3.3 Operating conditions
3.1.1 Pipes, fittings, valves, gaskets, fasteners, etc., such as pipe assemblies and instruments, that require degreasing have passed inspection and acceptance.
Table 1 Common degreasers
Name of the fatty agent
Scope of application
note
Industrial dichloroethane
metal part
Hydrolysable to trace amounts of hydrochloric acid
Industrial trichloroethylene
metal part
Pure carbon trichloride stabilizer, non-corrosive to common metals
Industrial Alcohol
Less demanding equipment and parts
The fat is weak.
65% above concentrated nitric acid
Acid fittings for concentrated nitric acid units
Strong oxidizers that dissolve or dissolve certain metals.
Alkaline degreasing solution (see Tables 3.1.2-2 and 3.1.2-3).
Simple shape, easy to clean pipes
It is not suitable for precision parts and metal parts with surface conversion layers.
Table 2: Proportion and process conditions for hot alkali degreasing
serial number
Composition (g/l)
Removal temperature (°C)
Clearance time (minutes)
1
Sodium hydroxide 50 sodium phosphate 30 sodium carbonate 30 sodium carbonate 5
100
30~40
2
Sodium hydroxide 30 Sodium phosphate 15 Sodium carbonate 5 Sodium carbonate 15
85~95
20~30
Table 3: Formulation and conditions of alkaline degreasing solution
serial number
Formulation (weight %)
Scope of application
1
Sodium hydroxide O.5-5 sodium phosphate 10-3 sodium silicate 1-4
General Steel Parts
2
Sodium hydroxide 2-5 sodium phosphate 1-8 sodium silicate 3
General Steel Parts
3
Sodium hydroxide O.5-3 sodium phosphate 7-2.5 sodium silicate 1-2
Common copper and copper alloy parts
4
Sodium phosphate 5-8 2-3 5 Sodium dihydrogen phosphate sodium silicate 0.5-6-1
Weakly alkaline, with the ability to remove oil, low corrosion to metals
Table 4: Emulsifier formulations for degreasing agents
serial number
names
Weight ratio (%)
1
gasoline
67
2
turpentine
22.5
3
lauric acid
5.4
4
triethanolamine
3.6
5
Dingy Fiber Solvent
1.5
4 Construction techniques.
4.1 Construction procedures are shown in Figure 1.
Figure 1 construction procedures
METHOD: 4.2 Common methods of oil removal are: immersion; immersion. Infiltration; scrubbing; and circulation system.
4.2.1 Immersion method on the inner surface of pipelines
Fill the tube with solvent, either by filling the end of the tube with a wooden block or other blocking method, or by soaking the tube directly in the plate of the degreasing tank for 1 to 1.5 hours, rotating it every 15 min for several weeks so that the tubes can be evenly distributed over the entire surface after multiple cleanings and submersions. The amount of solvent required per meter of pipe is usually 5.
Table 5 Dosage of fat absorbent per metre
Pipe diameter (mm)
15
20
25
32
40
50
65
Solvent volume (L)
0.15
0.20
0.30
0.40
0.50
0.60
0.70
Solvent dipping arc (degree)
251
205
200
179
161
143
116
Pipe diameter (mm)
80
100
125
150
200
250
300
Solvent volume (L)
4.80
4
4.25
4.5
2
2.5
3
Solvent dipping arc (degrees)
110
102
93
87
79
73
68
4.2.2 Scrubbing and skimming of large-diameter pipes and their external surfaces
Plastic tubs or buckets containing solvent cleaner, brushes or grease-free cloths, such as scrubbing silk for scrubbing pipes, long-lasting pipe cleaning ties for two-way scrubbing of pipes.
4.2.3 System circulation
The system has been installed or skimmed to form two types of system contamination that can be used by means of system cycling.
4.2.3.1 The cycling time is based on the size of the system and the diameter of the pipe, the degree of contamination is determined, generally not less than 60 minutes, for larger piping systems, it should be grounded to the temporary piping, temporary piping connections are shown in Figure 2. .
Figure 2 diagram of temporary piping connections for the system cycling method
4.2.3.2 For small-diameter piping systems (e.g., lubricating oil systems), on-site plant wind power may also be used to blow plant wind onto the piping for wind and degreasing media, with temporary piping connections.

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