SH 3501-2002 Specification for the construction and acceptance of pipeline projects for highly toxic and flammable media in petrochemical industry
Some standard content:
ICS75.020
Registration No.: J249-2003
Petrochemical Industry Standard of the People's Republic of China SH3501—2002
Replaces SH3501—2001
Specification for construction and acceptance of hypertoxic and combustible medium piping engineering in petrochemical industry2003-02-09 issued
2003-05-01 implementation
State Economic and Trade Commission issued
1 Scope·
2 Normative reference documents
3 General principles
4 Pipeline classification
5 Inspection of pipeline components
5.1 General provisions.·
5.2 Inspection of pipes·
Inspection of valves·
5.4 Inspection of other pipeline components
6 Pipeline prefabrication and installation
Pipeline prefabrication
6.2 Pipeline installation
7 Pipeline welding
General provisions·
7.2 Preparation before welding and joint assembly·
Welding process requirements·
Preheating and heat treatment:
7.5 Quality inspection·
8 Pipeline system test·
8.1 Pipeline system pressure test
8.2 Pipeline system purge
8.3 Gas leakage test and vacuum test9 Handover documents
Appendix A (informative appendix) Commonly used toxic and flammable media Appendix B (informative appendix) Welding joint groove form and assembly requirements Appendix: Article explanation-
SH3501-2002
SH3501-2002
This specification is revised by the Fifth Construction Company of Sinopec Group on the "Petrochemical Highly Toxic and Flammable Medium Pipeline Engineering Construction and Acceptance Specification" SH3501-2001 according to the notice of the National Economic and Trade Department Industry [2002] No. 36. This specification is divided into 9 chapters and 2 informative appendices. Compared with SH3501-2001 "Petrochemical Highly Toxic and Combustible Medium Pipeline Engineering Construction and Acceptance Specification", the main changes of this specification are as follows: the scope of application is expanded to medium and mildly toxic media; the pipeline classification regulations are adjusted to be consistent with SH3059-2001 "Petrochemical Pipeline Design Equipment Selection General Principles"; the relevant content is coordinated with GB50235-97 "Industrial Metal Pipeline Engineering Construction and Acceptance Specification"; the relevant regulations on pipeline component inspection and testing in the original specification are revised; the relevant regulations on welding joint inspection are improved. The provisions marked with bold in this specification are mandatory and must be strictly enforced. This specification is managed by the Zibo Branch of the Sinopec Group Construction Specification Management Station and interpreted by the Sinopec Group Fifth Construction Company. During the implementation of this specification, if you find that there is a need for modification or supplement, please provide us with your opinions and relevant information for reference in future revisions.
Management unit: Sinopec Construction Specification Management Station Zibo Branch Address: PO Box 132, Zibo City, Shandong Province Postal Code: 255438
Editor: Sinopec Fifth Construction Company Address: No. 35, Kangle Road, Xigu District, Lanzhou City, Gansu Province Postal Code: 730060
Main drafters: Yao Daigui, Zhang Xigeng, Wang Qinghua, Shan Chengjia This specification was issued in 1985, revised for the first time in 1997, revised for the second time in 2001, and this is the third revision. II
1 Scope
SH3501-2002
Petrochemical Toxic and Combustible Medium Pipeline Engineering Construction and Acceptance Specification This specification specifies the construction and inspection requirements for petrochemical toxic (toxicity levels are extremely hazardous, highly hazardous, moderately hazardous and slightly hazardous) and combustible medium pipeline projects.
This specification applies to the construction and acceptance of steel pipeline projects for toxic and flammable media with a design pressure of 400Pa [absolute pressure] ~ 42MPa [gauge pressure] and a design temperature of -196℃850C.
This specification does not apply to the construction and acceptance of long-distance pipelines and urban public gas pipelines. 2 Normative references
The clauses in the following documents become clauses of this specification through reference in this specification. For all dated referenced documents, all subsequent amendments (excluding errata) or revisions are not applicable to this specification. However, the parties who reach an agreement based on this specification are encouraged to study whether the latest versions of these documents can be used. For all undated referenced documents, the latest versions are applicable to this specification. GB4159 Metal low temperature Charpy impact test method - G/29 Jinfang true ratio high impact GB/T4334.1-6 Stainless steel corrosion test method GB5777 Seamless steel pipe ultrasonic flaw detection method JB4730 Pressure vessel nondestructive testing
In the same thickness
About n (number #g
SH3503-2001 Petrochemical engineering construction and delivery technical documents SH3059-2001 Petrochemical pipeline design equipment selection general rules SH3064 Petrochemical steel general valve selection, inspection and acceptance SH3505 Petrochemical construction safety technical regulations SH3521 Petrochemical instrument engineering construction technical regulations SH3526 Petrochemical heterogeneous steel welding regulations National Quality Inspection Boiler [2002] No. 109 Boiler Pressure Vessel Pressure Pipe Welder Examination and Management Rules Ministry of Labor issued [1 993] No. 441 Rules for Qualification Assessment of Nondestructive Testing Personnel for Boiler and Pressure Vessels 3 General Provisions
3.1 The construction of toxic and flammable medium pipelines shall be carried out in accordance with the provisions of the design documents. Modification of the design or substitution of materials shall be approved by the design unit. 3.2 The safety technology and labor protection of pipeline construction shall be implemented in accordance with the provisions of SH3505. When constructing in an area that has been put into production, construction safety technical measures shall be formulated according to the characteristics of the production area. 3.3 Units that undertake the construction of toxic and flammable medium pipelines must hold the corresponding pressure pipeline installation license issued by the quality and technical supervision administrative department.
移一国可m，不爱i色品高品情
SH3501-2002
3.4 Welders engaged in the construction of toxic and flammable medium pipelines shall be examined in accordance with the examination and management rules for boiler pressure vessel pressure pipeline welders, and shall obtain Nondestructive testing personnel who obtain a certificate of qualification shall be assessed in accordance with the qualification assessment rules for nondestructive testing personnel of boilers and pressure vessels, and obtain the corresponding qualification certificate.
4 Pipeline classification
41 The classification of pipelines for transporting combustible materials shall comply with the provisions of SH30592001. See Table 1 Common properties and prices. For combustible media, see Appendix A.
Pipeline classification
Transporting and at the same time
Table 1 Pipeline classification
Applicable range
1 Toxicity level is limited to blood hazardous media (pipeline removal) 2 The degree of toxicity is the internal environment of hazardous media, such as light, carbon disulfide, rapid hydrogen medium pipeline design
Support 10OMP code to reach the price of electricity, can deliver medium pipeline
Healthy medium pipeline
#Step high
Normal medium pipeline (propylene glycol phosgene ||tt ||Transporting mixed media
5 Inspection of pipeline components
5.1 General provisions
Except for chemical and household oxygen pipelines
Main combustible gas and methyl ether liquefier, Class A and Class B combustible body pipelines
Complete quality control
More power, light
Inner combustible wave medium pipelines
9℃ low temperature ticket
Can The characteristics of your pipeline, the high-innovation pipeline treatment in the female non-standard pipeline should be based on the main medium as the basis for the classification of the pipeline. BO 511 Toxic and combustible medium 512 Pipeline components Pipeline characteristics are the requirements of the technical specifications. The pipeline components used should meet the requirements of the manufacturing units of pressure pipe components, compensators, safety protection food, etc. When the local quality and technical supervision administrative department has regulations, the pressure pipe component manufacturing unit safety registration certificate should be obtained. 5.1.3 Pipeline components must have quality certification documents. Products without quality certification documents shall not be used before the product is used. The quality certification documents should be reviewed and checked with the actual objects. If the physical markings of the pipe components delivered are unclear or inconsistent with the quality certification documents, or if there is any objection to the characteristic data or test results in the product quality certification documents, the supplier shall conduct a verification test according to the corresponding standards or trace the product manufacturing unit. Before the objection is resolved, the batch of products shall not be used.4 Before using the pipeline components, the appearance inspection shall be carried out. The surface quality shall meet the requirements of the corresponding product standards. Those that fail to meet the requirements shall not be used.
515 The key alloy components of the main body of the alloy steel pipeline components shall be semi-quantitatively analyzed and reviewed by spectral analysis or other methods according to the proportion specified in this specification. And make good marks. 516 The design documents have low-temperature impact value requirements for materials, and the product quality certification documents shall have low-temperature impact toughness test values. If they fail to meet the requirements of GB4159, make supplementary tests.
SH3501-2002
5.1.7 If one of the samples sampled or inspected according to regulations fails, the original number of samples must be doubled for sampling. If there are still unqualified samples, the batch of pipeline components shall not be used, and they shall be marked and isolated. 5.1.8 Pipeline components shall be stored in different areas, and stainless steel pipeline components shall not come into contact with non-alloy steel and low-alloy steel. 5.2 Pipe Inspection
5.2.1 For pipes that convey toxic and flammable media, the specifications, quantity and markings of the pipes shall be checked according to the design documents before use. 5.2.2 The quality certification documents of the pipes shall include the following: a) Product standard number:
steel grade:
c) Furnace number, batch number, delivery status
weight and number of pieces:
d) Product name, specification and quality grade: e) Various inspection results specified in the product standard and order contract: manufacturer's inspection mark
5.2.3 If 5.2.4 The grade of steel for the cargo pipe, furnace number, batch number and delivery status of the cargo pipe that are resistant to intergranular corrosion shall not be recorded. If the delivery status is inconsistent with the quality certification documents, the batch of pipes shall not be used. Otherwise, supplementary inspection shall be carried out in accordance with the relevant provisions of GB/T4334.1-6 in the product quality certification documents. 5.2.5 The quality certification documents of pipes for conveying extremely harmful and highly hazardous media shall include ultrasonic test results, otherwise they shall be inspected one by one in accordance with the provisions of GB5777. 5.2.6 The surface quality of steel pipes shall comply with the following provisions: a) There shall be no zero lines, folds, hairline lines, folds, delamination, scarring, etc. on the inner and outer surfaces of the steel pipe; b) The depth of rust, scratches and other mechanical damage on the surface of the steel pipe shall not exceed the relevant level! The negative deviation of wall thickness allowed by the product standard in 2017
c) The processing accuracy and roughness of the thread and groove at the end of the steel pipe shall meet the requirements of the design documents or manufacturing standards:dy has a mark that meets the requirements of the product standard
V5.2.7 Among SHA-level pipelines, the outer surface of the pipes with a design force equal to or greater than 10MPa shall be non-destructively tested one by one according to the following methods. The testing method and defect assessment shall comply with the provisions of JB4730, and the inspection results shall be qualified with "level: a) Magnetic steel pipes with an outer diameter greater than 12mm shall be tested by magnetic particle testing: b) Non-magnetic steel pipes shall be tested by penetration testing L5.2.8 Among SHA-level pipelines, pipes for conveying extremely hazardous media with a design pressure less than 1OMPa (except for this batch) shall be tested for each batch (referring to the same batch number, furnace number, material, and specification) 5% but not less than one pipe shall be sampled for external surface magnetic particle inspection or penetration inspection according to the method and evaluation standard specified in Article 527 of this Code, and the inspection result shall be qualified based on the working grade. If the sampling inspection fails, it shall be handled in accordance with the provisions of Article 5.1.7 of this Code.
5.2.9 Surface defects found in the pipe after magnetic particle inspection or penetration inspection are allowed to be repaired. The actual wall thickness after repair shall not be less than 90% of the nominal thickness of the pipe, and shall not be less than the minimum thickness specified in the design documents. 5.3 Valve inspection
5.3.1 Valves that are required to undergo low-temperature sealing tests in the design documents shall have a low-temperature sealing test certificate issued by the manufacturer. 5.3.2 For general valves used for SHA-grade pipelines, their welds or valve bodies and valve cover castings shall have non-destructive inspection conforming to the provisions of SH3064. Test certificate:
SH3501-2002
5.3.3 Before installing the valve, the valve body, sealing surface and materials of gaskets and packings with special requirements shall be sampled according to the "Yanmen Specifications" in the design documents. At least one piece shall be sampled for each batch: the valve body of alloy steel valves shall be spectrally analyzed piece by piece. If it does not meet the requirements, the batch of valves shall not be used. What's the solution? 5.3.4 The appearance quality of the valve shall meet the requirements of the product standards and shall not have cracks, oxide scale, sand adhesion, looseness and other defects that affect the strength. 5.3.5 Before installing the valve, the valve body shall be subjected to liquid pressure test one by one. The test pressure shall be 1.5 times the nominal pressure. The valve shall be qualified if there is no leakage after stopping the pressure for 5 minutes.
5.3.6 Valves with upper sealing structure The upper seals of the valves shall be tested one by one, and the test pressure shall be 1.1 times the nominal pressure. During the test, the upper sealing surface shall be closed, and the packing gland shall be loosened. The pressure shall be stopped for 4 minutes, and no leakage shall be qualified. 5.3.7 The liquid pressure test and upper seal test of the valve shall be carried out with clean water as the medium. During the liquid pressure test of stainless steel valves, the oxygen ion content in the water shall not exceed 100mg/L. After the test is qualified, the water stains shall be removed immediately. 5.3.8 The valve seat sealing surface shall be tested for sealing according to the provisions of SH3064. 5.3.9 For valves manufactured according to SH3064 or API standards and with corresponding certification marks, and the user supervises and accepts the valves at the manufacturer, 5% of each batch and no less than one can be sampled. If there are unqualified ones, they shall be handled according to the provisions of Article 5.1.7 of this specification. 5.3.10 The safety valve shall be debugged according to the opening pressure specified in the design documents. The pressure shall be stable during pressure adjustment, and the opening and closing test shall not be less than 3 times. After the debugging is qualified, it shall be sealed in time. 5.3.11 Valves that have passed the inspection and test shall be marked, and the valve inspection and test records shall be filled in. 5.4 Inspection of other pipeline components
5.4.1 The product quality certification documents of other pipeline components shall be checked, and the following items shall meet the requirements of product standards: a) Chemical composition and mechanical properties:
b) Metallographic analysis results of alloy steel forgings: c) Heat treatment results and weld non-destructive testing report. 5.4.2 The outer surface of the pipe fittings shall be marked with the manufacturer's code (trademark), specifications, material brand and batch number, and shall be consistent with the quality certification documents, otherwise it shall not be used
5.4.3 The surface of the pipe fittings shall not have cracks, the appearance shall be smooth and free of oxide scale, and other surface defects shall not exceed the allowable depth specified in the product standard. The processing accuracy of grooves and threads shall meet the requirements of product standards. The welds of welded pipe fittings shall be well-formed and have a smooth transition with the parent material. There shall be no defects such as cracks, lack of fusion, lack of penetration, and undercut. 5.4.4 The pipe fittings of SHA-grade pipelines shall be subjected to surface non-destructive testing in accordance with the provisions of Articles 5.2.7 and 5.2.8 of this specification. 5.4.5 The threads of bolts and nuts shall be complete, without defects such as scratches and burrs, and the processing accuracy shall meet the requirements of product standards. Bolts and nuts shall fit well without looseness or jamming. V5.4.6 Alloy steel bolts and nuts used in pipelines with a design pressure equal to or greater than 10MPa shall be subjected to rapid spectral analysis piece by piece, and two pieces shall be sampled for hardness test in each batch. If any unqualified, they shall be handled in accordance with the provisions of Article 5.1.7 of this specification. 5.4.7 Alloy steel bolts and nuts for low-temperature pipelines with a design temperature as low as 29°C shall be subjected to rapid spectral analysis and inspection piece by piece, and two bolts shall be sampled for low-temperature impact performance test in each batch. If any unqualified, they shall be handled in accordance with the provisions of Article 5.1.7 of this specification. 5.4.8 Rapid spectral analysis of other alloy steel pipeline components shall be conducted, and 5% of each batch shall be sampled, and no less than pieces. If there are any non-conformities, they shall be handled in accordance with the provisions of Article 5.1.7 of this specification.
5.4.9 Sealing gaskets shall be sampled and inspected according to product standards, and each batch shall not be less than one piece. Wound gaskets shall not be loose or warped, and their surfaces shall not have defects such as scars, gaps, unevenness, and rust spots that affect the sealing performance. The 4
edges of metal gaskets and asbestos rubber sheet gaskets shall be cut neatly, and the surface shall be flat and smooth, without defects such as bubbles, delamination, wrinkles, and scratches. SH3501-2002
5.4.10 On-site production of asbestos rubber sheet gaskets shall not be carried out in an environment below 15°C, and the storage period of oil-resistant asbestos rubber sheets shall not exceed one and a half years from the date of sheet production, and the storage period of ordinary asbestos rubber sheets shall not exceed two years. 5.4.11 The flange sealing surface shall not have defects such as radial scratches. 6 Pipeline prefabrication and installation
6.1 Pipeline prefabrication
6.1.1 Pipeline prefabrication shall be carried out according to the design single-line diagram confirmed by on-site review or the single-line diagram drawn according to the pipeline plane drawing. The pipeline number, on-site assembly position and adjustment margin shall be marked on the prefabrication drawing. 6.1.2 Each process in the pipeline prefabrication process shall check the pipe identification and do a good job of transplanting the identification. Stainless steel pipes and low-temperature steel pipes shall not be marked with steel stamps
6.1.3 The minimum bending radius of the bend shall comply with the requirements of the design documents. When the design documents do not specify, it shall comply with the provisions of Table 2. Table 2 Minimum bending radius of bends
Pipeline design pressure
Note: D. is the outer diameter of the pipe.
Bend manufacturing method
Cold and hot bending
6.1.4 When the design allows the use of welded steel pipes to bend the pipe, the weld should avoid the tension or compression area. Minimum bending radius
6.1.5 After the bend is made, the minimum wall thickness at the bend shall not be less than 90% of the nominal wall thickness of the pipe, and shall not be less than the minimum wall thickness specified in the design documents. The difference between the maximum outer diameter and the minimum outer diameter at the bend shall comply with the following provisions: a) SHA grade pipes shall be less than 5% of the outer diameter of the pipe before bending: b) SHB, SHC and SHD grade pipes shall be less than 8% of the outer diameter of the pipe before bending. 6.1.6 After the bend is made, the centerline deviation of the straight pipe section shall not be greater than 1.5mm/m, and shall not be greater than 5mm. Required center
Support center
Figure 1 Center deviation of bend
6.1.7 The heat treatment of steel pipes after hot bending or cold bending shall comply with the following provisions: a) The hot bending temperature and post-bending heat treatment of steel pipes shall be carried out in accordance with the provisions of Table 3. For steel grades not included in the table, they shall be carried out in accordance with the requirements of the material supply status:
SH3501-2002
b) The heat treatment of steel pipes after cold bending shall be carried out in accordance with the provisions of Table 4 c) Ferritic alloy steel pipes with a nominal diameter greater than 100mm or a wall thickness greater than 13mm shall be subjected to stress relief heat treatment after bending d) Cold-bent pipes with stress corrosion shall be subjected to stress relief heat treatment: The heating rate, constant temperature time and cooling rate during heat treatment shall comply with the provisions of Article 7.4.9 of this specification. Table 3 Hot bending temperature and heat treatment of steel pipe
Steel type or steel grade
12CrMo
15CrMo
12CrIMov
1Cr5Mo
OCT18N9
Cr18Ni12M027
Cr25Ni20
Steel type or steel grade
12CrMo
15CrMa
12CriMoy
OCr18Ni9
C18Ni12Mo2Ti
Cr25Ni20
Heat temperaturebzxZ.net
750-1050
90 0-1050
8001050
800~1050
800~1050
9001200
Heat treatment requirements
When the final high temperature is less than 900℃ and the wall thickness is greater than or equal to 19mm, 600C-650C tempering
900℃~920℃ normalizing
980-1020℃ normalizing plus 720-760℃ tempering850C875 complete tempering or 725C~750 high temperature tempering1050
Heat treatment of steel pipe after cold bending
Odd bend radius
6.1.8After bending, SHA grade pipe should be subjected to magnetic particle inspection or penetration inspection. o
1100 solid bath
heat treatment requirements
600C~650 annealing
680 C-700C annealing
720C~760c fire
according to the design document requirements
defects should be repaired, and the wall thickness after repair shall not be less than 90% of the nominal wall thickness of the pipe, and shall not be less than the minimum thickness specified in the design document 6.1.9 SHA grade pipe bending processing, after passing the inspection, the SHA grade pipe bending processing record shall be filled in. 6.1.10 The main pipe in the jacket pipe must use seamless steel pipe. When there is a girth weld on the main pipe, the weld shall be 100% radiographically inspected, and concealed operations can be carried out only after passing the pressure test. The gap between the casing and the main pipe should be evenly hooked, and the support block should be welded according to the requirements of the design documents. 6.1.11 The top parts of the pipeline after inspection should be marked and the ports should be closed. There should be no sand, iron filings, slag and other debris inside. It should be protected from damage and pollution during storage.
6.112 When the pipeline is connected by threaded flanges, the processing and inspection of the threads and sealing surfaces should comply with the provisions of the design documents. 6
6.2 Pipeline installation
SH3501-2002
6.2.1 Before installing the pipeline, the sand, iron filings, slag and other debris inside the pipeline components should be removed piece by piece. Pipes with special requirements in the design documents should be processed according to the requirements of the design documents. 6.2.2 The opening of the pipeline should be completed before the installation of the pipe section. When opening a hole in an installed pipeline, foreign matter generated by cutting in the pipe should be cleaned up.
6.2.3 When installing the pipeline, the flange sealing surface and gasket should be checked. There should be no scratches, rust spots or other defects that affect the sealing performance. 6.2.4 Before installation, the contact line between the flange ring groove sealing surface and the metal ring gasket should be checked. After the metal ring gasket is rotated 45° on the sealing surface, check that there should be no discontinuity in the contact line.
, should be tightened strictly according to the torque specified in the design documents. 6.2.5 For bolts with tightening torque requirements,
, the torque wrench should be calibrated in advance, and the allowable deviation is ±5%. Bolts with force nuts must be tightened until the nuts fall off. 6.2.6 On the flow orifice plate, the length of the downstream straight pipe should meet the requirements of the design documents, and the inner surface of the weld within this range should be flush with the inner surface of the pipeline.
The specification is
6.2.7 The installation direction and length of the thermometer sleeve and other inserts shall comply with the deviation and spacing of SH3521 and the specification of Table 5.
6.2.8 The bolts connecting the flanges shall be able to pass smoothly through the bolt holes. The parallelism between the flange sealing surfaces is specified.
Pipeline level
Parallel deviation and spacing between flange sealing surfacesParallel deviation
DN≤300
SHB, SHC, SHD
Connected pipelines
Simple moving machines)
6.2.9 The weight and additional torque of the rotating machine (with doors, etc.) shall not act on the machine. The slope of the inlet pipeline caused by horizontal deviation DN>300
It is advisable to start installation from the machine side
Unit: mm
Gasket thickness +1.5
Gasket thickness +2.0
Install the pipe bracket first. The horizontality or verticality of the pipeline and
Imm/mGas compressor
The horizontality or verticality of the sound channel should be small and the slope should be good. Towards the side of the liquid separation tank.
After the hanger is installed, the flange on the pipe should be removed. 6.2.10 The pipes and their bolts connected to the machine should be able to pass smoothly through the bolt holes.
Should not exceed the specified value in Table 6.
Radial deviation and distance
Parallel deviation of flange sealing surface, radial deviation and distance
Machine rotation speed
3000-6000
Parallel deviation
Diameter is still beautiful
Bolt, all bolts in the free state
When the design or manufacturer does not specify,
Gasket thickness +1.5
Gasket thickness +10
Thickness of the whole piece +1.0
6. 2.11 Before the machine is tested, the connection flanges between the pipeline and the machine shall be subjected to final connection inspection. During the inspection, a dial indicator shall be set on the coupling to monitor the displacement, and then the flange connection bolts shall be loosened and tightened for observation. The displacement shall comply with the following provisions: a) When the speed is greater than 6000r/min: the displacement value shall be less than 0.02mm b) When the speed is less than or equal to 6000/min, the displacement value shall be less than 0.05mm 6.2.12 During the trial operation of the pipeline system, the connection bolts of high-temperature or low-temperature pipelines shall be hot-tightened or cold-tightened in accordance with the following provisions SH3501-2002
a) The temperature of hot-tightening or cold-tightening of bolts shall comply with the provisions of Table 7: Table 7 Temperature of hot-tightening and cold-tightening of bolts Working temperature
250 ~350
—70～—29
Primary hot tightening and cold tightening temperature
Working temperature
Working temperature
b) Hot tightening or cold tightening should be carried out after the tightening operating temperature is maintained for 2hc) When tightening the pipeline connecting bolts, the maximum internal pressure of the pipeline shall comply with the following regulations:Secondary hot tightening and cold tightening temperature
Working temperature
Working temperature
1) When the design pressure is less than 6MPa, the maximum internal pressure of hot tightening should be less than 0.3MPa:2) When the design pressure is greater than 6MPa, the maximum internal pressure of hot tightening should be less than 0.5MPa:3) Cold tightening should be carried out after pressure relief:
d) Bolt tightening should have technical measures to protect operators. Unit: C
6.2.13 For pipelines with electrostatic grounding requirements, each section should be well conductive. When the resistance value between each pair of flanges or threaded joints is greater than 0.032, a wire jumper should be provided.
6.2.14 For the electrostatic grounding lead of the pipeline system, welding is preferred. The resistance value to ground and the grounding position should meet the requirements of the design documents. 6.2.15 Materials or parts used for electrostatic grounding shall not be oiled before installation. The conductive contact surface must be rust-free and connected reliably. 6.2.16 For stainless steel pipelines with electrostatic grounding requirements, the wire jumper or grounding lead should be transitioned by a stainless steel plate and shall not be directly connected to the stainless steel pipe.
6.2.17 After the electrostatic grounding of the pipeline is installed and tested, the pipeline electrostatic grounding test record should be filled in in time. 6.2.18 When installing the pipeline, the support and hanger should be fixed and adjusted at the same time. The support and hanger should be positioned correctly, installed firmly, and the contact between the pipe and the supporting surface should be good.
6.2.19 For pipe hangers without thermal displacement, the hanger rods shall be installed vertically. For pipe hangers with thermal displacement, the hanger points shall be installed in the opposite direction of displacement, at a displacement of 1/2 of the displacement value. 6.2.20 Fixed brackets and limit brackets shall be installed strictly in accordance with the requirements of the design documents. Fixed brackets shall be fixed before the pre-stretching or pre-compression of the compensation device.
The sliding surface of the guide bracket or sliding bracket shall be clean and flat, without skewness or jamming, and the thermal insulation layer shall not hinder its displacement. 6.2.21
6.2.22 The spring installation height of the spring support and hanger shall be adjusted in accordance with the provisions of the design documents. The limit plate of the spring support shall be removed before the test run.
6.2.23 When welding the support and hanger, the weld shall not have defects such as leakage, cracks, insufficient height and length. When welding the bracket to the pipeline, there shall be no undercut on the pipe surface.
6.2.24 When installing the pipeline, temporary supports and hangers should not be used. When temporary supports and hangers are used, they must not be welded to the pipeline. After the pipeline is installed, it should be replaced with formal supports and hangers in time. 6.2.25 After the pipeline is installed, it should be checked one by one according to the design documents to confirm the form and position of the supports and hangers. 6.2.26 When installing the "Ⅱ" type compensator, pre-stretching or pre-compression should be carried out according to the provisions of the design documents. The allowable deviation is 10% of the pre-stretching amount and not more than 10mm.
When the "I" type compensator is installed horizontally, the parallel arm should have the same slope as the pipeline, and the vertical arm should be horizontal. 8
6.2.27 The installation of the corrugated compensator shall be carried out in accordance with the following requirements: a) Pre-stretching or pre-compression shall be carried out in accordance with the provisions of the design documents, and the force shall be uniform: SH3501-2002
b) The end of the corrugated compensator with the weld inside shall be located at the medium inflow end on the horizontal pipeline and at the upper part on the vertical pipeline c) The corrugated compensator shall remain coaxial with the pipeline and shall not deflect d) After the corrugated compensator is pre-stretched or pre-compressed, a temporary restraint device shall be installed to fix it, and the temporary restraint device shall be removed before the pipeline load operation.
6.2.28 After the installation and commissioning of the pipeline compensator is qualified, the installation record shall be kept. 7 Pipeline welding
7.1 General provisions
7.1.1 Before welding, a welding operation instruction shall be prepared according to the welding process assessment report. The welder shall weld according to the specified welding operation instruction. 7.1.2 The welding materials shall have product quality certification documents, and the actual objects shall be consistent with the batch number on the certificate. During the appearance inspection: the coating of the welding rod shall not be damp, fall off or have obvious cracks. The surface of the welding wire should be cleaned of oil, rust, etc. before use. The welding rod should be baked according to the requirements of the instruction manual or welding operation manual, and kept dry during use. Welding rods that have been out of the factory for more than one year should be tested for welding process performance and can only be used after passing the test. 7.1.3 When the welding environment temperature is lower than the following requirements, measures should be taken to increase the welding environment temperature: a) Non-alloy steel welding, not less than -20℃ b) Low alloy steel welding, not less than -10℃ c) Austenitic stainless steel welding, not less than -5℃: d) Other alloy steel welding, not less than 0℃. 7.1.4 If one of the following conditions occurs in the welding environment of the pipeline and no protective measures are taken, the welding operation should be stopped: a) When welding with welding rods, the wind speed is equal to or greater than 8m/s; when welding with gas shielded welding, the wind speed is equal to or greater than 2m/s: b) Relative humidity is greater than 90%:
c) Rain or snow.
7.1.5 Tungsten rods should be used for tungsten inert gas welding. The purity of hydrogen used should be above 99.95%. 7.1.6 Oxyacetylene flame welding shall not be used for pipe joints. Please add mt. Please use the following methods. 7.2 Preparation before welding and joint assembly
7.2.1 The setting of pipeline welds should be convenient for welding, heat treatment and inspection, and should meet the following requirements: a) Except for the use of standard elbows without straight pipe sections, the distance between the center of the pipeline weld and the bending point of the elbow should not be less than the outer diameter of the pipe, and not less than 100mmG
b) The net distance between the weld and the edge of the support and hanger should not be less than 50mm. The net distance between the weld that needs heat treatment and the edge of the support and hanger should be greater than 5 times the weld width and not less than 100mm: C) The distance between the centers of two adjacent welds of the pipeline should be controlled within the following range: 1) The distance between the two circumferential seams of the straight pipe section shall not be less than 100mm and not less than the outer diameter of the pipe: 2) Except for the shaped pipe fittings, the distance between any two other welds shall not be less than 50mm:3 When the welding environment temperature is lower than the following requirements, measures should be taken to increase the welding environment temperature: a) Non-alloy steel welding, not less than -20℃ b) Low alloy steel welding, not less than -10℃ c) Austenitic stainless steel welding, not less than -5℃: d) Other alloy steel welding, not less than 0℃. 7.1.4 If the welding environment of the pipeline encounters one of the following situations and no protective measures are taken, the welding operation should be stopped: a) When welding with arc welding, the wind speed is equal to or greater than 8m/s When welding with gas shielded welding, the wind speed is equal to or greater than 2m/s: b) Relative humidity is greater than 90%:
c) Rain or snow.
7.1.5 Tungsten rods should be used for tungsten inert gas arc welding. The purity of hydrogen used should be above 99.95%. 7.1.6 Oxyacetylene flame welding shall not be used for pipe joints. Please use the following methods: 7.2 Preparation before welding and joint assembly
7.2.1 The setting of pipeline welds shall be convenient for welding, heat treatment and inspection, and shall meet the following requirements: a) Except for the use of shaped elbows without straight pipe sections, the distance between the center of the pipeline weld and the bending point of the elbow shall not be less than the outer diameter of the pipe, and shall not be less than 100mmG
b) The net distance between the weld and the edge of the support and hanger shall not be less than 50mm. The net distance between the weld that needs heat treatment and the edge of the support and hanger shall be greater than 5 times the width of the weld and shall not be less than 100mm: C) The distance between the centers of two adjacent welds of the pipeline shall be controlled within the following range: 1) The distance between the two circumferential seams of the straight pipe section shall not be less than 100mm, and shall not be less than the outer diameter of the pipe: 2) Except for shaped pipe fittings, the distance between any two other welds shall not be less than 50mm:3 When the welding environment temperature is lower than the following requirements, measures should be taken to increase the welding environment temperature: a) Non-alloy steel welding, not less than -20℃ b) Low alloy steel welding, not less than -10℃ c) Austenitic stainless steel welding, not less than -5℃: d) Other alloy steel welding, not less than 0℃. 7.1.4 If the welding environment of the pipeline encounters one of the following situations and no protective measures are taken, the welding operation should be stopped: a) When welding with arc welding, the wind speed is equal to or greater than 8m/s; when welding with gas shielded welding, the wind speed is equal to or greater than 2m/s: b) Relative humidity is greater than 90%:
c) Rain or snow.
7.1.5 Tungsten rods should be used for tungsten inert gas arc welding. The purity of hydrogen used should be above 99.95%. 7.1.6 Oxyacetylene flame welding shall not be used for pipe joints. Please use the following methods: 7.2 Preparation before welding and joint assembly
7.2.1 The setting of pipeline welds shall be convenient for welding, heat treatment and inspection, and shall meet the following requirements: a) Except for the use of shaped elbows without straight pipe sections, the distance between the center of the pipeline weld and the bending point of the elbow shall not be less than the outer diameter of the pipe, and shall not be less than 100mmG
b) The net distance between the weld and the edge of the support and hanger shall not be less than 50mm. The net distance between the weld that needs heat treatment and the edge of the support and hanger shall be greater than 5 times the width of the weld and shall not be less than 100mm: C) The distance between the centers of two adjacent welds of the pipeline shall be controlled within the following range: 1) The distance between the two circumferential seams of the straight pipe section shall not be less than 100mm, and shall not be less than the outer diameter of the pipe: 2) Except for shaped pipe fittings, the distance between any two other welds shall not be less than 50mm:
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