Some standard content:
National Standard of the People's Republic of China
Technical conditions for urea high pressure condenser
Specifications for urea high pressure condenser1 Subject content and scope of application
This standard specifies the technology of urea high pressure condenser in urea plant Requirements and inspection rules. UDC 661.717.5
.048.2
GB 10476--89
This standard applies to shell side design pressure not greater than 1.26MPa, tube side design pressure not greater than 16.17MPa, design temperature Urea high-pressure condenser (hereinafter referred to as the condenser) with an ultra-low carbon austenitic stainless steel lining structure with a temperature not higher than 200°C. Reference standards
2
GB2270 stainless steel seamless pipe
GB3323 steel fusion welded butt joint radiography and quality classification GB3985
asbestos rubber sheet
JB741| |tt||JB 755
JB1127
JB1147
JB 1151
JB 1152
JB2536
Technical conditions for steel welded pressure vessels
Technical conditions for pressure vessel forgings
Technical conditions for steel welded spherical storage tanks
Technical conditions for steel tubular heat exchangers
Ultrasonic flaw detection of high-pressure seamless steel pipes| |tt||Ultrasonic flaw detection of butt welds of steel pressure vessels JB3963 for pressure vessel painting, packaging and transportation
Ultrasonic flaw detection of pressure vessel forgings
JB3965
Magnetic particle flaw detection of steel pressure vessels
ZB G 93001
ZB G 93002
ZB G 93003
ZB G 93004
ZB G 93007
Ultra-low carbon austeni Preparation of samples for intergranular corrosion tendency of solid stainless steel Urea high-pressure equipment manufacturing and inspection methods
Urea high-pressure equipment manufacturing and inspection methods Ultra-low carbon austenitic stainless steel intergranular corrosion tendency test Urea high-pressure equipment manufacturing and inspection methods Ultra-low carbon Austrian Selective corrosion inspection and metallographic inspection of stenitic stainless steel Urea high-pressure equipment manufacturing inspection method Automatic surfacing layer Ultrasonic inspection of urea high-pressure equipment Corrosion-resistant stainless steel pipe-tube sheet welding process assessment and welder skill assessment ZB G 93008
Urea high-pressure equipment surfacing welding process qualification and welder skill assessment ZBG 93009 Urea high-pressure equipment lining plate and internal parts welding process qualification and welder skill assessment 3 technical requirements
3.1 Basic requirements
Condenser design, In addition to complying with this standard, manufacturing and acceptance should also comply with the requirements of JB741, JB1147 and drawings. 3.2 Materials
Pressure component materials and materials in contact with corrosive media should comply with relevant national standards, ministry standards and drawing regulations, and must have a quality certificate.
3.2.1 Carbon steel
3.2.1.1 Forgings or plates with thickness greater than 50mm should be inspected by ultrasonic flaw detection. The steel plate should meet the requirements of Level II in JB1150, and the forgings should meet the requirements of JB755 and drawings.
The Ministry of Chemical Industry of the People's Republic of China approved 858 on 21 February 1989
Implemented on 10-01 1989
GB 10476—89
3.2.1.2 Thickness greater than 50mm, For carbon steel plates and forgings with a tensile strength greater than or equal to 490MPa, the element content restrictions are: C<0.24%, B = 0 V<0.10%.
3.2.1.3 All carbon steel plates in high-pressure parts should be fine-grained For steel, the grain size grade should be no less than grade 6, and the yield strength at the design temperature should be guaranteed.
3.2.1.4 The tensile strength of welded carbon steel materials (including welds and heat-affected zones) at room temperature shall not be greater than 720MPa, the yield-strength ratio shall not be greater than 0.8, and the hardness of any part of the material after welding shall not be greater than HB280. 3.2 .2 Ultra-low carbon austenitic stainless steel
3.2.2.1 The lining layer, sealing ring, pipe, internal parts and other parts in the equipment that are in contact with corrosive media should be made of 00Cr17Ni14Mo2 (improved type) and 00Cr25Ni22Mo2 type ultra-low carbon Austenitic stainless steel material (hereinafter referred to as urea grade stainless steel). Its chemical composition is shown in Table 1. Table 1
Materials
00Cr17Ni14Mo2
(improved)
00Cr25Ni22Mo2
C
<0.030
<0.020| |tt||Cr
>17.00
24.50
～25.50
Ni
>13.00
21.50
~ 22..50
Chemical composition,
Mo
>2.20
1.90
~2.30
N
< 0.20
0.10
~0.14
%
Mn
<2.00
1.50
~2.00||tt| |si
<1.00
<0.40
s
0.030
40.015
P
<0.035||tt ||0.020
3.2.2.2 The metallographic structure of urea grade stainless steel materials (including deposited metal) shall be a single-phase austenitic structure after welding or final heat treatment, and shall not have continuous network carbides or α phase exists, the ferrite content shall not be greater than 0.6%. 3.2.2.3 The intergranular corrosion tendency test of urea grade stainless steel materials (including molten metal) should be carried out in accordance with the regulations of ZBG93002. The average corrosion rate CR of five cycles should comply with the following regulations: 00Cr17Ni14Mo2 improved stainless steel CR<3.3μm/48h##| |tt||b.00Cr25N22Mo type 2 stainless steel CR<1.5μm/48 h. The sampling for the intergranular magic corrosion tendency test should be carried out in accordance with the provisions of ZBG93001. 3.2.2.4 After the intergranular corrosion tendency test, the lining plates, heat exchange tubes and welded joint samples must be subjected to selective corrosion inspection and metallographic inspection. Other urea grade stainless steel parts in contact with corrosive media (including deposited Metal), in the intergranular corrosion tendency test, if the corrosion rate in the fourth and fifth cycles exceeds 50% of the corrosion rate in the third and fourth cycles, the sample must be subjected to selective corrosion inspection. The inspection method is carried out according to ZBG93003, and the results should comply with the following regulations: 00Cr17Ni14Mo2 (improved) stainless steel: Selective corrosion of plates, pipes, bars, forgings and welding heat-affected zones a.
The corrosion depth is perpendicular to the rolling The depth of selective corrosion of the welding deposited metal shall not be greater than 200 μm in any direction. b. 00Cr25N22Mo2 type stainless steel: The selective corrosion depth of plates, pipes, bars, forgings and their welding heat-affected zones and deposited metal is not greater than 100 μm in any direction. C. The metallographic structure shall comply with the provisions of Article 3.2.2.2. 3.2.2.5 The heat exchange tubes should meet the following requirements: a. The outer diameter and wall thickness deviation of the heat exchange tubes should meet the medium and high-level precision requirements of GB2270. b. The heat exchange tube should be a whole, seamless tube and undergo 100% ultrasonic flaw detection. The flaw detection should comply with JB1151 regulations. c. The heat exchange tubes should be subjected to a hydraulic pressure test one by one, and the test pressure is 1.25 times the design pressure. 3.2.3 Welding materials
Welding rods, welding wires, welding strips and fluxes used for welding of urea grade stainless steel must have quality certificates, and the chemical composition of the deposited metal should comply with the requirements in Table 2 .
Deposited metal of welding materials
00 C r17 Ni14 Mα2
(improved type)
c
<0.045
00 Cr25 Ni22 Ma2
3.2.4 Other materials
Cr
17.00
～19.50
24.00
～ 26.00
GB10476-89
Table 2
Chemistry
Ni
14.00
～18.00
19.00||tt ||~ 23.00
Mo
>2.20
1.90
2.40
into
N
points,|| tt||0.20
%
si
<1.00
<0.50
Mn
4.00
～7.00| | tt | 3.2.4.1
3.2.4.2 The adhesive used for sealing gaskets should be free of chloride ions and solid particles, or use medical vaseline. S | | tt | | 0.020 |
3.2.5 Material re-inspection
3.2.5.1 Urea grade stainless steel material re-inspection: Re-inspect the chemical composition according to the furnace batch number.
a.
b． Determine the ferrite content piece by piece.
Materials with the same furnace number, the same specification, and the same heat treatment furnace number should be sampled for intergranular corrosion tendency testing. More than two c.
samples cannot be taken from the same material. The preparation of samples should comply with the regulations of ZBG93001. The sampling quantity is shown in Table 3. Table 3
Material category
Plate
Material
Bar forgings
Tube
860
Material||tt ||Total number of materials,
>5
<5
>10
10
10
>200
200
200
pieces
Number of samples,
pieces
Take 1 sample for every 5 pieces, and take 1 sample for the remaining less than 5 pieces Take 1 sample for every 10 pieces, and take 1 sample for the remaining less than 10 pieces 1
Take 1 sample for every 200 pieces, and take 1 sample for the remaining less than 200 pieces2
GB 10476 --89
d. Carry out selective corrosion inspection and metallographic inspection according to the provisions of Article 3.2.2.4. Check the size and surface quality of the lining plates and pipes one by one (root). e.
Ultrasonic flaw detection should be carried out on the high-pressure nozzles and heat exchange tubes one by one (when the heat exchange tubes have a steel factory flaw detection certificate, 10% can be randomly inspected), and the f.
flaw detection standards should meet JB1151 regulations.
3.2.5.2 Urea grade stainless steel welding materials shall be retested according to the heat batch number for the chemical composition, ferrite content, intergranular corrosion tendency test, selective corrosion and metallographic structure of the deposited metal. 3.3 Hot and cold processing
3.3.1 General provisions
3.3.1.1 The welding groove of stainless steel parts should be machined. If plasma cutting is used, the overheated area should be cleaned and the surface of the groove should be polished smoothly. , Ferrite measurement and liquid penetration inspection should also be carried out on the weld groove of urea grade stainless steel parts. 3.3.1.2 Penetration inspection shall be carried out after welding groove processing of carbon steel pressure components in high-pressure parts. 3.3.1.3 The grinding wheel used for polishing the surface of stainless steel is pure oxide material or rubber, nylon mixed with alumina. Grinding discs that have been used to grind carbon steel must not be used to grind stainless steel.
3.3.1.4 The protection of stainless steel parts during the manufacturing and transportation process should be strengthened to prevent bumps and scratches. If there are defects that affect the corrosion resistance, they must be ground. The grinding parts should have a smooth transition and the depth of grinding should be Negative deviations from the specified thickness must not be exceeded. 3.3.1.5 Tempering color is not allowed on the surface of polished stainless steel. The surface of the material that is in direct contact with corrosive media must be polished after polishing.
3.3.2 Head
3.3.2.1 A sample with a chord length of not less than 2m should be used for the split head. Check the curvature of the flaps of the split head. The gap at any part should not be greater than 2.5mm. .
3.3.2.2 The misalignment of the butt welds of the integral stamping head panel should not be greater than 2mm, and the misalignment of the butt welds of the split head should not be greater than 10% of the plate thickness and not greater than 3mm. When the thickness of the split head plate exceeds 80mm, the misalignment of the weld seam shall not exceed 5mm. 3.3.2.3 For split-flap heads, the edges and corners formed by the butt welds of the flaps shall comply with the provisions of Article 5.3 of JB1127. 3.3.2.4 Before lining or surfacing welding, the inner surface of the head should be machined or polished smooth, and no defects affecting the quality of the lining or surfacing welding are allowed. The local concave and convex amount should meet the following requirements: a. When using lining structure, it should not be larger than 1.5mm. b. When using a surfacing structure, it should not be larger than 2 mm. 3.3.2.5 The difference between the maximum inner diameter and the minimum inner diameter of the head shall not be greater than 0.5% of the nominal inner diameter and shall not be greater than 6mm. 3.3.3 Tubesheet
3.3.3.1 After the tubesheet is surfacing with a corrosion-resistant layer, the flatness tolerance shall not be greater than 4mm. 3.3.3.2 The pipe hole grooves of the tube sheet should be completely cleared of burrs and inspected hole by hole with a 5x magnifying glass. Suspicious areas should be inspected with water-washing penetrant according to Appendix 6 of JB741.
3.3.3.3 The verticality tolerance between the tube hole of the tube plate and the end face of the tube plate shall not be greater than 0.5/1000, and the end face of the tube orifice shall be on the same plane. 3.3.4 Connection of heat exchange tubes and tube sheets
3.3.4.1 The pipe ends of the heat exchange tubes and the tube sheets must be clean, and there must be no metal shavings, oil stains, rust and other defects that affect the welding quality. 3.3.4.2 Only welding is used to connect the heat exchange tube and the tube plate. Expansion joints are not allowed. Position welding can be performed on the lower tube plate end. 3.3.4.3 It is recommended to use manual tungsten argon arc welding for welding the heat exchange tube and the tube plate twice, with wire filling each time, and the tube should be protected by argon gas during each welding.
3.3.5 Operation and inspection procedures for the connection between heat exchange tubes and tube sheets 3.3.5.1 Welding of the first layer of weld on the tube sheet (the corresponding end is the free end), 3.3.5.2
Welding The first layer of welding seam of the lower tube plate,
Use compressed air to conduct a tightness test,
3.3.5.31
Weld the second layer of welding seam of the upper and lower tube plates; ||tt ||3.3.5.42
Visual inspection of welds, penetrant inspection, ferrite measurement, 3.3.5.52
861
3.3.5.6 Tightness test with ammonia|| tt||3.3.5.7 Shell side hydraulic pressure test;
Weld penetration inspection.
3.3.5.8*
3.3.6 Barrel sections and linings
GB 10476-89
3.3.6.1 The upper deviation of the inner diameter of the low-pressure cylinder is 4mm, and the lower deviation is 03.3 .6.2 The straightness tolerance of the lining cylinder section shall not be greater than 1/1000 and not greater than 1mm. 3.3.6.3 The misalignment of the longitudinal weld of the lining shall not be greater than 1 mm, and the edge angle formed at the longitudinal weld shall not be greater than 1 mm. 3.3.7 Assembly
3.3.7.1 All butt welds of the lining must be inspected and qualified, and the inner and outer surfaces of the lining must be thoroughly cleaned before they can be installed into carbon steel components. 3.3.7.2 The maximum gap of the pipe box cylinder lining shall not be greater than 1mm, the maximum gap of the head lining shall not be greater than 1.5mm, and the maximum gap of the manhole flange lining shall not be greater than 0.5mm. 3.3.7.3
The straightness tolerance of the cylinder shall not exceed 0.5/1000 of the cylinder length and shall not be greater than 8mm. 3.3.7.4 The opening of the nozzle should avoid the longitudinal circumferential weld of the cylinder. The distance between the edge of the opening and the weld should not be less than 3 times the plate thickness and not less than 100mm.
The pipe ends of the tubes protruding from the upper tube plate should be on the same plane, and the upper end pipe orifices should be flush with the horizontal deviation of ±1mm. 3.3.7.53
3.4 ??Welding
3.4.1 Vessel welding must be undertaken by welders who have passed the examination. Welders must strictly abide by the welding procedure regulations. 3.4.2 The welding procedure qualification and welder examination of urea grade stainless steel shall comply with the regulations of ZBG93009, ZBG93008 and ZBG93007.
3.4.3 All urea grade stainless steel welds in contact with the medium should be fully penetrated (unless the drawing has special requirements), the interlayer temperature should not be greater than 150°C, and the surface of the weld in contact with the medium should be welded last. And try to maintain the soldering state. 3.4.4. The manual surfacing of urea grade stainless steel shall be no less than three layers (one transition layer and the rest shall be corrosion-resistant layers). There should be no less than two layers of strip welding (one transition layer and the rest are corrosion-resistant layers). The thickness of the corrosion-resistant layer of manual or strip welding (measured from the lowest point on the surface) shall not be less than 3mm for the lining part and shall not be less than 6mm for the sealing surface part after processing. 3.4.5 Large-area manual surfacing welding beads should be arranged in strips or concentric circles. The arc closing points of the same welding layer are respectively an oblique line or the same radius line. The overlap of adjacent welding beads should be no less than two halves. 1 weld bead width. 3.4.6 The weld beads for electrode surfacing should be arranged in strips or concentric circles, and the overlapping points of the concentric circle weld beads should be on the same radius line. The corrosion-resistant layer weld bead should be parallel to the transition layer weld bead, and the overlap fusion line of the corrosion-resistant layer weld bead should be staggered with the transition layer overlap fusion line. 3.4.7 The surface of urea grade stainless steel welds (including overlay corrosion-resistant layers) shall not have defects such as cracks, pores, arc craters, slag inclusions, and undercuts. 3.4.8 For the repair of urea grade stainless steel welds, the repair plan should be formulated by welding technicians. Defects can only be removed by machining or grinding. The number of repairs on the same part should not exceed two times. Any repairs exceeding two times must be approved by the manufacturing unit. With the approval of the technical person in charge, the repaired parts, times and non-destructive testing results shall be recorded on the quality certificate. 3.4.9 For urea grade stainless steel welds, on-site welding records must be kept. After welding, the welder should promptly mark the location near the weld. He can only use waterproof ink that is insoluble in water, does not contain metallic pigments, oxides and sulfur, or a round head with a tip radius of less than 0.15mm as a welder's mark. Welder stamps are allowed.
3.5 Heat treatment
3.5.1 When urea grade stainless steel parts are subjected to post-weld heat treatment, the temperature of any part should comply with the following regulations: 00Cr17Ni14Mo2 (improved type) material should not exceed 520℃ 00Cr25Ni22Mo2 type material should not should exceed 570℃. 3.5.2 Urea grade stainless steel parts are not allowed to undergo local heat treatment or more than two solid solution heat treatments. 3.5.3 Urea grade stainless steel parts with a cold forming deformation rate exceeding 20% ??or hot forming should be subjected to solution heat treatment. Note: When the molding temperature is less than 510°C, it is cold forming, and when the temperature is greater than 510°C, it is hot forming. The temperature of heat treatment should be uniform, and its temperature deviation should be ±14°C. 3.5.4
3.5.5 The following parts and components welds and transition layers of overlay welding must undergo welding stress relief heat treatment: a. All surfacing transition layers;
862
welds between ball head and pipe box barrel,
b.
c.
pipe box barrel Body and tube plate welds;
Welds between ball heads and manhole flanges:
d.
GB1047689
Lifting lugs, backing plates, reinforcing pipes and Welds of ball heads, pipe box cylinders, tube plates and top covers. e.
3.6 test plate
3.6.1 Welding test plate
3.6.1.1 The following parts of the product should have a welding test plate: a.
Low-voltage shell Longitudinal weld:
b.
Head split butt weld,
c.
Head lining splicing weld,
d.
Longitudinal welds of lining cylinder:
The pipe box cylinder and tube plate, pipe box cylinder and head and expansion joint welds of the first manufactured products. e.
3.6.1.2 The lining welding test plate shall undergo weld appearance quality inspection, radiographic inspection, penetrant inspection, ferrite determination, metallographic inspection, intergranular corrosion tendency test, selective corrosion inspection and chemical composition test. 3.6.1.3 In addition to complying with the provisions of Article 29 of JB741, the carbon steel welding test plate should also be added with the following inspections: Hardness measurement: The measurement location is as shown in Figure 1
a.
E
b. Yield strength at design temperature.
3.6.2 Heat treatment test plate
Figure 1
3.6.2.1 For urea grade stainless steel parts that need to be heat treated, at least one test plate must be included in each batch number. 3.6.2.2 The heat treatment test plates of urea grade stainless steel shall be subjected to ferrite measurement, intergranular corrosion tendency test, selective corrosion inspection and metallographic examination, and shall comply with the relevant provisions of Article 3.2.2. 3.7 Surface treatment:
3.7.1 After pickling and passivation treatment of urea grade stainless steel, it must be washed with water with a chloride ion content of less than 25PPm until the pH test paper shows neutral.
3.7.25
Finished surfaces such as bolts, nuts, sealing surfaces, etc. should be coated with medical vaseline. 3.7.3
The protective plate outside the expansion joint on the low-voltage shell should be coated with molybdenum disulfide on its contact surface during installation. 4 Inspection rules
4.1 Inspection
4.1.1 Weld appearance quality inspection:
All welds must be inspected for appearance quality, and the inspection standards are in accordance with Articles 16 and 17 of JB741 In addition, the following requirements should also be met: 4.1.1.1 The surface of urea grade stainless steel welds (including overlay corrosion-resistant layers) shall not have defects such as cracks, pores, arc craters, slag inclusions, incomplete penetration, and undercuts. For diameters less than 0.5 mm pores, slag inclusions and undercuts with a depth less than 0.5mm are allowed to be polished with a smooth transition, and the thickness after polishing shall not be less than the minimum thickness specified in the design. 863
GB 10476--89
4.1.1.2 The weld between the heat exchange tube and the tube sheet shall not have undercuts, tungsten inclusions, slag inclusions, cracks and pores, and the pipe ends shall not be burned through or overheated . 4.1.2 When the weld passes the visual inspection, the following non-destructive inspection shall be carried out. 4.1.2.1
Radiographic inspection is specified in Table 4:
serial number
weld part
1
2
3||tt ||5
6
7
8
4.1.2.2
Table 4
Flaw detection standard
Quantity level
Longitudinal seam and circumferential seam of low-pressure shell
Weld between upper tube plate and low-pressure shell
Simplified weld between tube plate and pipe box
Head and pipe box Simplified weld
Manhole flange and head weld
Stainless steel lining butt weld
Wave expansion joint and shell weld
Wave expansion joint weld
Ultrasonic inspection is specified in Table 5:
No.
Sequence
1
2
3
4|| tt||5
6
7
8
Inspection position
Inspection
Weld seam between tube plate and pipe box cylinder| |tt||Welds between the head and the pipe box body
Welds between the manhole flange and the head
Welds between the lower tube sheet and the low-pressure shell
Tube sheet head surfacing welding Transition layer (junction surface) Tube-sheet head surfacing corrosion-resistant layer (junction surface) weight exceeds 300kg forgings
Heat exchange tubes, high-pressure pipes
4.1.2.3
Penetration inspection press Table 6:
86.4
Table 5
GB3323
accounts for the total length of the relative weld, %
>20
100||tt ||Quantity of flaw detection
(accounting for the total length of the corresponding butt weld)%
100bzxz.net
100
100
Inspection root by root (with certificate| |tt||Heat exchange tube sampling inspection 10%)
Level
JB755N level
AB level
Quality
Quantity classification
Ⅱ Level
Level I
Guard Level
Level I
Standard
JB1152
ZBG93004
JB3963||tt| |JB1151
Serial number
9
10
4.1.2.4
Serial number
Weld part
GB1047689
Table 6
Flaw detection standard
Flaw detection quantity
Tube sheet, Head, pipe box cylinder, manhole flange weld groove, stainless steel surfacing transition layer surface
Lining weld, surfacing corrosion-resistant layer surface
Reinforcement pipe, hanging column and head ( Pipe box (Simplified) Weld surface Nozzle and head (tube plate, Simplified) Weld surface Pipe hole weld groove of tube plate
Final weld surface of pipe and tube plate
Wave expansion Section weld surface
All weld surfaces of stainless steel internal parts
The magnetic particle inspection of the processed stainless steel gasket sealing surface shall be carried out according to Table 7:
Table 7
Flaw detection Standard
Number of flaw detection
Weld location
Weld surface of tube plate and pipe box cylinder
Weld surface of head and pipe box cylinder||tt| |Manhole flange and head weld surface
Temporary accessory weld surface after shovel grinding
200mm wide outer surface of the head after molding (cross strip) high-pressure bolts
JB741| |tt||Accounting for the total length of the corresponding weld, %
100
Appendix 6
Remarks
Before and after the hydraulic test
Before and after heat treatment||tt| |Before and after the hydraulic test
Only observe the suspicious parts with a magnifying glass
Before and after the hydraulic test
JB3965
Accounting for the total length of the corresponding weld, %
100
Remarks
Before and after the hydraulic test
Before and after the hydraulic test
(according to JB741 Appendix 7)
4.1.3 Ferrite inspection: || tt||The ferrite content in all stainless steel pipes, linings, internal parts, stainless steel welds and surfacing layers in contact with corrosive media shall not exceed f0.6%.
4.1.4 Dimensional inspection|| tt||865
GB 10476—89
All dimensions should be inspected, and the dimensional inspection report should at least include the following: a.
b.
c.|| tt||d.
e.
f.
g.
h.
Shape, connecting position,
Bearing Position and bolt holes,
Head thickness,
Overlay layer thickness,
Lining thickness,
Heat exchange tube arrangement,
Heat exchange tube Height of protruding tube sheet:
manhole sealing surface.
Hydraulic test and tightness test
4.2
Hydraulic test
4.2.1
4.2.1.1 Welding of internal and external surfaces of equipment before hydraulic test Slag, flux, oxide scale and other materials should be cleaned and kept clean. For test water, the chloride ion content on the tube side shall not be greater than 25Ppm, and the chloride ion content on the shell side shall not be greater than 2pPm. 4.2.1.2
The pipe side and shell side shall be subjected to hydraulic pressure tests respectively. The test pressure shall be in accordance with the drawing requirements and the pressure holding time shall not be less than 1 hour. 4.2.1.3
4.2.2 Tightness test
4.2.2.1 The first weld between the pipe and the tube sheet is subjected to air and neutral soap solution bubbling test, the test pressure is 0.05MPa, and the pressure is maintained The time is not less than 1 hour.
4.2.2.2 For the final weld between the pipe and the tube sheet, use 15% ammonia + 85% nitrogen for ammonia leakage. The test pressure is 0.14MPa, and the pressure holding time is not less than 8 hours.
4.2.2.3 The loose lining and lining ring welds shall be subjected to an ammonia penetration test (100% ammonia gas) after the hydraulic pressure test. The test pressure is 0.02MPa and the pressure holding time is not less than 8 h.
4.2.2.4 The high-pressure pipe guard plate welds shall be air tested before the hydraulic test, and the test pressure shall be 0.05MPa. 5. In addition to complying with the provisions of JB2536, marking, painting, packaging, transportation and storage should also comply with the following requirements. 5.1 Logo
The nameplate should include the following basic contents:
a.
b.
c
d.
e.|| tt||f.
g.
h.
i.
Manufacturing unit,
Product name and drawing number:
Product number:
Design pressure (tube, shell)
Test pressure (tube, shell)
Design temperature (tube, shell)
Heat exchange area: || tt||Container category;
Equipment weight:
Manufacturing date.
j.
5.2 Paint
In addition to complying with the requirements of JB2536, all external surfaces of ferritic steel (except machined surfaces) should also be sandblasted, cleaned, and painted with two A layer of anti-rust primer (each layer is about 40μm), the first layer should be carried out within 24 hours after sandblasting is completed. 5.3 Packaging
5.3.1 The M10 and ZG1/4\ threaded interfaces should be blocked with screw plugs, and the material should be the same as the material of the connecting parts. 5.3.2 All detachable parts, spare parts and spare parts of the equipment should be packed and shipped. 5.3.3 Equipment special tools should be packed and shipped separately and marked with "Special Tools". 866
Manufacturing unit,
Product name and drawing number:
Product number:
Design pressure (tube, shell)
Test pressure (tube, shell )
Design temperature (tube, shell)
Heat exchange area:
Container category;
Equipment weight:
Manufacturing date.
j.
5.2 Paint
In addition to complying with the requirements of JB2536, all external surfaces of ferritic steel (except machined surfaces) should also be sandblasted, cleaned, and painted with two A layer of anti-rust primer (each layer is about 40μm), the first layer should be carried out within 24 hours after sandblasting. 5.3 Packaging
5.3.1 The M10 and ZG1/4\ threaded interfaces should be blocked with screw plugs, and the material should be the same as the material of the connecting parts. 5.3.2 All detachable parts, spare parts, and spare parts of the equipment should be packed and shipped. 5.3.3 Equipment special tools should be packed and shipped separately and marked with "Special Tools". 866
Manufacturing unit,
Product name and drawing number:
Product number:
Design pressure (tube, shell)
Test pressure (tube, shell )
Design temperature (tube, shell)
Heat exchange area:
Container category;
Equipment weight:
Manufacturing date.
j.
5.2 Paint
In addition to complying with the requirements of JB2536, all external surfaces of ferritic steel (except machined surfaces) should also be sandblasted, cleaned, and painted with two A layer of anti-rust primer (each layer is about 40μm), the first layer should be carried out within 24 hours after sandblasting is completed. 5.3 Packaging
5.3.1 The M10 and ZG1/4\ threaded interfaces should be blocked with screw plugs, and the material should be the same as the material of the connecting parts. 5.3.2 All detachable parts, spare parts and spare parts of the equipment should be packed and shipped. 5.3.3 Equipment special tools should be packed and shipped separately and marked with "Special Tools". 866
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