Manufacturing process of marine ammonia fuel tanks

Abstract

The present invention relates to the technical field of ammonia fuel tank manufacturing, and discloses a manufacturing process for a marine ammonia fuel tank, comprising the following steps: preparation of parts; assembly and welding; post-weld heat treatment; non-destructive testing; assembly and welding of stainless steel pipes; machining flanges; and pressure testing. The production of the process cylinder increases the control of the roundness and circumference accuracy of the cylinder, which facilitates better matching of the size of the head. The manufactured tank body can meet the requirements of pressure, temperature, strength, and safety protection. The process machining can improve the accuracy of the groove of the manhole hole of the head, ensuring the welding quality of the manhole hole. The heat treatment of the entire tank releases welding stress and improves the quality of the weld. The tank body has better corrosion resistance and higher strength, and can better withstand complex environmental conditions at sea, such as wind and waves, salt spray, and humidity. The process performs machining of the flange surface and then performs a pressure test after all welding is completed, which greatly improves product quality and improves the product qualification rate. The manufactured tank body can meet the structural strength and stability of the ship.

Description

Technical Field

[0001] The present invention relates to the field of ammonia fuel tank manufacturing, and in particular to a manufacturing process of a marine ammonia fuel tank. Background Art

[0002] Patent application publication number CN104259768A discloses a method for manufacturing a head. The method includes the following steps: blanking: cutting stainless steel sheets into discs and removing foreign matter from the disc surfaces; initial stamping: applying lubricant to the discs, clamping them between the upper and lower dies of a stamping press, and stamping them at a temperature of 200-240°C; drum forming: aligning the die head on the drum press with the discs and rotating the disc by controlling the rotation of the rotating wheel; final spinning: clamping the head onto the spinning machine, aligning the center of the head with the center of the spinning machine base, adjusting the forming wheel to be tangential to the head, and then adjusting the support roller according to the position of the forming wheel, and spinning the head; and heat treatment.

[0003] This prior art does not describe the manufacturing process of the head for the tank body, which needs to be further described.

[0004] Therefore, a new technical solution is needed to solve the above technical problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a manufacturing process for a marine ammonia fuel tank that meets the requirements of pressure, temperature, strength, safety protection, etc., meets the structural strength and stability of the ship, and can withstand complex environmental conditions at sea, such as wind and waves, salt spray, humidity, etc. in a marine environment. The tank body has better corrosion resistance and higher strength.

[0006] The technical solution adopted in the present invention is:

[0007] The manufacturing process of marine ammonia fuel tanks includes the following steps:

[0008] Step 1: Parts preparation: including the production of the cylinder: use the cut steel plate to roll it on a three-roller plate rolling machine to make the part into a cylindrical shape, spot weld the joints of the cylinder, and use a submerged arc welding machine to weld it after correction. After welding, use a three-roller plate rolling machine to roll it back to the roundness and diameter of both ends of the cylinder to meet the requirements of the drawing; production of the head; production of the manhole side head; production of the manhole long neck flange; production of the manhole neck connection ring; production of the manhole flange; production of other parts such as saddles: steel plate cutting parts;

[0009] Step 2: Assembly, welding and production;

[0010] Step 3: Post-weld heat treatment: After all welding is completed except for stainless steel, the tank body is put into the electric heating furnace for controlled heating, insulation and cooling according to the heat treatment process temperature curve;

[0011] Step 4: Nondestructive testing: According to NB / T47013 standard, all butt welds are subject to 100% RT and 10% PT, all T-butt welds are subject to 100% UT and 100% PT, all fillet welds are subject to 100% PT, and all welds are subject to 100% VT. The RT testing technology level is AB and the weld quality level is II. The UT testing technology level is B and the weld quality level is I. The RT testing technology level is II and the weld quality level is I.

[0012] Step 5: Assemble and weld stainless steel pipes: Assemble stainless steel pipes, grounding columns and other stainless steel parts using argon arc welding;

[0013] Step 6: Machining flange: Machining the manhole flange surface and fastening bolt holes;

[0014] Step 7: Pressure test: Conduct pressure test on saddle plate and lug plate, water pressure test on tank body, and tightness test on tank body.

[0015] Preferably, in step 1, the production of the head includes the following steps:

[0016] Step 1: Use the cut disc, replace the die with one that matches the size of the head, clamp the disc in the upper and lower die rings, and make sure that the center of gravity of the die head and the center point of the disc part are in a straight line, press the disc part tightly, and then punch;

[0017] Step 2: Replace the drum die, clamp the head, align the die head and the wafer, and use the template for comparison during the pressing process;

[0018] Step 3: Replace the spinning die, clamp the head, make sure the center of gravity of the die head and the center point of the part are in a straight line, adjust the forming wheel and the head to be tangent, and then adjust the support wheel according to the position of the forming wheel, and constantly compare with the template until it meets the drawing requirements;

[0019] Step 4: After checking that all data are qualified, perform groove processing according to the checked perimeter, total inner height and other data.

[0020] Preferably, in step 1, the production of the manhole side head includes the following steps:

[0021] Step 1: Fix the prepared head parts on the tire frame, and use a gas cutting knife to cut the rough manhole hole with a diameter margin according to the drawing size;

[0022] Step 2: Fix the head on the horizontal gantry milling platform and use the milling machine to fine-mill the manhole hole and manhole groove.

[0023] Preferably, in step 1, the production of the manhole long neck flange includes the following steps:

[0024] Step 1: Use the rough forging blank to process the inner circle, outer circle and butt groove of the long neck flange;

[0025] Step 2: Leave an allowance for the flange thickness to be completed after all welding is completed.

[0026] Preferably, in step 1, the production of the manhole neck connecting ring includes the following steps:

[0027] Step 1: Use the cut steel plate to roll it on a three-roller plate rolling machine to make the part into a cylindrical shape;

[0028] Step 2: Spot weld the joints of the cylinders and weld them using a submerged arc welding machine after correction;

[0029] Step 3: After welding is completed, use a three-roller plate rolling machine to perform a second rounding to ensure that the roundness and diameter dimensions at both ends of the cylinder meet the requirements of the drawing.

[0030] Preferably, in step 1, the production of the manhole flange includes the following steps:

[0031] Step 1: Use the rough forging blank to weld the manhole handle;

[0032] Step 2: Process the flange's fitting surface and fastening bolt holes;

[0033] Step 3: Protect the flange mating surface with anti-rust oil, and paint the entire surface except the flange mating surface.

[0034] Preferably, the assembly welding production in step 2 includes the following steps:

[0035] Step 1: Fix the cylinder on the roller tire frame;

[0036] Step 2: Assemble and fix the anti-sway plate and the cylinder 1 by using solid wire gas shielded welding;

[0037] Step 3: Fix the head and manhole side head on both ends of the cylinder, align with the edge of the cylinder, and spot weld them in place;

[0038] Step 4: Use solid wire gas shielded welding to weld the inner groove, and then carbon planer the outer side and use submerged arc welding to weld the cover;

[0039] Step 5: Assemble and fix the manhole long neck flange and manhole neck connecting ring, and spot weld them in place;

[0040] Step 6: Use solid wire gas shielded welding to weld the butt girth seam;

[0041] Step 7: Install the saddle plate and weld it using solid wire gas shielded welding;

[0042] Step 8: First, assemble the saddle separately. After assembling according to the drawing, use solid wire gas shielded welding to weld it.

[0043] Step 9: Assemble the saddle and the cylinder. Use manual welding rods for welding except for the narrow angle positions. Use solid wire gas shielded welding for all other positions.

[0044] Step 10: Assemble the lifting lug and the lifting lug plate to the cylinder body and weld them using solid wire gas shielded welding.

[0045] Preferably, the pressure test in step 7 includes the following steps:

[0046] Step 1: Pressure test of the board: After assembly, heat treatment, non-destructive testing and other inspections are passed, use compressed air to perform a pressure test without painting. Check that there is no abnormal sound or visible deformation in the structure. Check with soap solution or other leak detection liquid to find out if there is any leakage. The test is qualified.

[0047] Step 2: Water pressure test of the tank body: After the pressure test of the saddle plate and the lug plate is passed, a pressure test of 1.5 times the design pressure is carried out using water to check that there is no abnormal sound, no visible deformation, no water seepage in the tank body, and no leakage during pressure maintenance. The test is considered passed.

[0048] Step 3: Tightness test of the tank body: After the water pressure test of the tank body is passed, use compressed air to perform a pressure test at the standard design pressure to check that there is no abnormal sound or visible deformation in the structure. Check with soap solution or other leak detection liquid to find out that there is no air leakage, maintain pressure and no leakage, and the test is passed.

[0049] Preferably, the saddle includes a saddle web, a saddle bottom plate, a saddle long rib plate, and a saddle short rib plate. The saddle has long rib plates on both sides of the saddle web, short rib plates symmetrically arranged in the middle, and a saddle bottom plate at the bottom.

[0050] Preferably, during the pressure test, the tank body is connected to a pressure gauge, a safety valve, and a pressure pump with a valve, and the tank body is placed on a fixed tire frame for the test.

[0051] Compared with the prior art, the present invention has the following beneficial effects:

[0052] 1. The process of the present invention increases the control of the roundness and circumference accuracy of the cylinder, which is convenient for better matching the size of the head. The manufactured tank body can meet the requirements of pressure, temperature, strength and safety protection.

[0053] 2. The machining process of the present invention can improve the accuracy of the groove of the manhole head and ensure the welding quality of the manhole. The heat treatment of the entire tank releases the welding stress and improves the quality of the weld. The tank body has better corrosion resistance and higher strength. When used in a marine environment, it can better withstand complex environmental conditions at sea, such as wind and waves, salt spray, humidity, etc.

[0054] 3. The process of the present invention performs machining of the flange surface and then performs pressure testing after all welding is completed, which greatly improves product quality and product qualification rate. The manufactured tank body can meet the structural strength and stability requirements of ships. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0056] Figure 1 It is a structural schematic diagram of the present invention;

[0057] Figure 2 For the present invention Figure 1 Side view of;

[0058] Figure 3 A schematic diagram of the cylinder body of the present invention is provided with an anti-sway plate;

[0059] Figure 4 Schematic diagram of the head of the present invention;

[0060] Figure 5 Schematic diagram of the hole side head of the present invention;

[0061] Figure 6 is a schematic diagram of a saddle of the present invention;

[0062] Figure 7 This is a schematic diagram of the tank body of the present invention being assembled and welded in a workshop;

[0063] Figure 8 Schematic diagram of the tank pressure test of the present invention.

[0064] Among them: 1. Cylinder; 2. Head; 3. Manhole side head; 4. Long neck flange; 5. Manhole neck connecting ring; 6. Manhole flange; 7. Saddle; 8. Saddle plate; 9. Lifting ear; 10. Lifting ear plate; 11. Roller tire frame; 12. Anti-sway plate; 13. Stainless steel pipe; 14. Stainless steel grounding column; 15. Saddle web; 16. Saddle bottom plate; 17. Saddle long rib plate; 18. Saddle short rib plate; 19. Pressure gauge; 20. Safety valve; 21. Valve; 22. Pressure pump; 23. Fixed tire frame for test. DETAILED DESCRIPTION

[0065] like Figure 1-8 As shown, the manufacturing process of a marine ammonia fuel tank includes the following steps:

[0066] Step 1: Preparation of parts:

[0067] a. Fabrication of cylinder 1: Select Classification Society material CL-II-2, use the cut steel plate to roll the part on a three-roll plate rolling machine to make the part into a cylinder with an inner diameter of 1800mm, and fix the joints of the cylinder by spot welding. After the inside is primed with solid wire gas shielded welding (JM-56 φ1.2), the cover is filled with submerged arc welding (JW-1 φ4+JF-B). When welding the butt joint, assemble the towing production test plate at the end of the longitudinal seam. The production test plate must be consistent with the product material, plate thickness, and groove form and welded simultaneously to ensure consistent welding conditions. When welding the butt joint, the weld must be continuous through the joint of the joint test plate. The towing test plate can be separated from the shell only after confirmation by the ship inspection agency. After welding is completed, use the three-roll plate rolling machine for a second rounding to ensure that the roundness and diameter of the two ends of the cylinder 1 match the size of the head 2, with a diameter error of less than 4mm. Use tooling to support and fix the two ends of the cylinder to ensure that the assembly dimensions do not change.

[0068] b. Production of head 2: Select classification society material CL-II-2, use the cut disc, replace the mold that meets the head size HEA1800X24mm, clamp the disc in the upper and lower die rings, and make sure that the center of gravity of the die head and the center point of the disc part are in a straight line, press the disc part, and perform stamping. Replace the drum die, clamp head 2, align the die head and the disc, use the template for comparison during the pressing process, replace the spinning die, clamp head 2, make sure that the center of gravity of the die head and the center point of the part are in a straight line, adjust the forming wheel and head 2 to be tangent, and then adjust the supporting wheel according to the position of the forming wheel. Continuously compare with the template until it meets the drawing requirements. After checking that all data are qualified, perform groove processing according to the checked circumference, total inner height and other data;

[0069] c. Fabrication of the manhole side cover 3: Fix the fabricated cover 2 parts on the frame, use a gas cutting knife to roughly cut a manhole hole with a diameter of 628mm according to the drawing dimensions, fix the cover on the horizontal gantry milling platform, use a milling machine to finish mill the manhole hole to a diameter of 638mm, and then mill out a 30° bevel on one side facing inward, leaving a 2mm root;

[0070] d. Production of manhole long neck flange 4: Use rough forging blanks, select material 16Mn, and process according to NB / T47023 standard DN600 PN=2.5MPA RF standard size. The inner diameter of the long neck flange is 600mm, and the butt groove is measured inward at 45° on one side, leaving a root of 2mm and a flange thickness allowance of 10mm. Processing is completed after all welding is completed;

[0071] e. Manhole neck connection ring 5 production: Select the classification society material CL-II-2, use the cut steel plate to roll the part on a three-roller plate rolling machine to make the part into a cylinder with an outer diameter of 632mm, and fix the joints of the cylinder by spot welding. Use solid wire gas shielded welding (JM-56 φ1.2) for welding; when welding the butt seam, assemble the towing production test plate at the end of the longitudinal seam. The production test plate must be consistent with the product material, plate thickness, and groove form and welded simultaneously to ensure consistent welding conditions; when welding the butt joint, the weld must be continuous through the joint of the joint test plate; the towing test plate can be separated from the shell only after confirmation by the ship inspection agency; after welding is completed, use the three-roller plate rolling machine to roll it back for the second time, and check that the outer diameter of the cylinder at both ends is 632mm±2mm;

[0072] f. Manhole flange 6 production: use rough forging blanks, material selection 16Mn, weld manhole handle; according to NB / T47023 standard DN600 PN=2.5MPA RF standard size processing; flange fitting surface is protected with anti-rust oil, except flange fitting surface, the whole is painted;

[0073] g. Production of saddle 7 and other parts: Select classification society material CL-II-2 and cut parts from steel plates.

[0074] Step 2: Assembly and welding:

[0075] A. Fix the cylinder 1 on the roller tire frame 11;

[0076] B. The anti-sway plate 12 is assembled and fixed to the cylinder 1, and is welded by solid wire gas shielded welding (JM-56 φ1.2);

[0077] C. Fix the head 2 and the manhole side head 3 at both ends of the cylinder 1, align the edges of the cylinder 1 and the head 2, with the misalignment ≤ 2mm, and spot weld them in place;

[0078] D. The outer side is welded with submerged arc welding (JW-1 φ4+JF-B), and the inner side is welded with solid wire gas shielded welding (JM-56 φ1.2);

[0079] E. Assemble and fix the manhole long neck flange 4 and the manhole neck connecting ring 5, and spot weld them in place;

[0080] F. Use solid wire gas shielded welding (JM-56 φ1.2) for welding and butt joint;

[0081] G. Assemble and fix the saddle plate 8, and use solid wire gas shielded welding (JM-56 φ1.2) for welding;

[0082] H. The saddle 7 is first assembled separately. After assembly according to the drawing, it is welded using solid wire gas shielded welding (JM-56φ1.2). The saddle 7 includes a saddle web 15, a saddle bottom plate 16, a saddle long rib plate 17, and a saddle short rib plate 18. The saddle 7 has saddle long rib plates 17 on both sides of the saddle web 15, saddle short rib plates 18 symmetrically arranged in the middle, and a saddle bottom plate 16 at the bottom;

[0083] I. Assemble the saddle 7 and the cylinder 1. Except for the narrow angle position, use the manual welding rod GFL-57Ni φ3.2 for welding. Use solid wire gas shielded welding (JM-56 φ1.2) for welding in all other positions.

[0084] J. Assemble the lifting lug 9 and the lifting lug plate 10 to the cylinder 1 and weld them using solid wire gas shielded welding (JM-56 φ1.2).

[0085] Step 3: Post-weld heat treatment: After all welding is completed except for stainless steel, the tank body is put into the electric heating furnace as a whole. The heating process is as follows: there is no limit on the heating rate when it rises to 300℃; the heating rate above 300℃ should not exceed 80℃ / hour; heat to 600℃±15℃ and keep warm for 75 minutes; the cooling rate shall not exceed 100℃ / hour when the temperature drops to 300℃; air cool to room temperature.

[0086] Step 4: Nondestructive testing: According to NB / T47013 standard, all butt welds are subject to 100% RT and 10% PT, all T-butt welds are subject to 100% UT and 100% PT, all fillet welds are subject to 100% PT, and all welds are subject to 100% VT. The RT testing technology level is AB and the weld quality level is II. The UT testing technology level is B and the weld quality level is I. The RT testing technology level is II and the weld quality level is I.

[0087] Step 5: Assemble and weld the stainless steel pipe: Assemble the stainless steel pipe 13, grounding column 14 and other stainless steel parts, and use stainless steel argon arc welding wire GTS-309 φ2.4 for argon arc welding;

[0088] Step 6: Machining flange: According to the NB / T47023 standard DN600 PN=2.5MPA RF standard size, process the long neck flange 4 fitting surfaces and bolt fastening holes;

[0089] Step 7: Pressure test: A. Pressure test of the board: After assembly, heat treatment, non-destructive testing and other inspections are passed, and before painting, use compressed air to perform a pressure test (150kPa). Check that there is no abnormal sound or visible deformation in the structure. Check with soap solution or other leak detection liquid to find out if there is any leakage. The test is qualified.

[0090] B. Hydrostatic test of the tank body: After the pressure tests of the saddle plate 8 and the lug plate 10 are passed, a pressure test of 1.5 times the design pressure is performed using water. The design pressure is 2.16MPa and the hydrostatic test pressure is 3.24MPa. Check that there is no abnormal sound or visible deformation in the structure, no water seepage in the tank body, and no leakage during pressure maintenance. The test is considered passed.

[0091] C. Tank Tightness Test: After the tank passes the hydraulic pressure test, it is subjected to a pressure test using compressed air at the standard design pressure (design pressure 2.16 MPa). Check that there are no abnormal noises or visible deformations in the structure. Check with soap solution or other leak detection fluid to ensure no air leaks. The test is considered passed if the pressure is maintained and there are no leaks. During the pressure test, the tank 1 is connected to a pressure gauge 19, a safety valve 20, and a pressure pump 22 with a valve 21. The tank 1 is placed on a fixed test stand 23.

[0092] The manufacturing process of the cylinder of the present invention increases the control of the roundness and circumference accuracy of the cylinder, better matches the size of the head, the machining step improves the accuracy of the groove of the manhole hole of the head, ensures the welding quality of the manhole hole, and the heat treatment of the entire tank releases the welding stress to improve the quality of the weld. After all welding is completed, the flange surface is machined and then a pressure test is performed. The use of this process greatly improves product quality and increases the product qualification rate.

[0093] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by those skilled in the art should be included in the scope of protection determined by the claims of the present invention.

Claims

1. The manufacturing process of marine ammonia fuel tank is characterized by: The following steps are involved: Step 1: Parts preparation: including the production of the cylinder: Use the cut steel plate on the three-roller plate rolling machine to roll the part into a cylindrical shape, spot weld the joints of the cylinder, and use the submerged arc welding machine to weld after correction. After welding, use the three-roller plate rolling machine for a second rounding to ensure that the roundness and diameter of the two ends of the cylinder meet the requirements of the drawing; Production of the head: Use the cut disc, replace the mold that meets the size of the head, clamp the disc in the upper and lower die rings, and make sure that the center of gravity of the die head and the center point of the disc part are in a straight line, press the disc part tightly, and perform stamping; replace the drum die, clamp the head, align the die head and the disc, and use the template for comparison during the pressing process; replace the spinning die, clamp the head, make sure that the center of gravity of the die head and the center point of the part are in a straight line, adjust the forming wheel and the head to be tangent, and then adjust the support wheel according to the position of the forming wheel, and constantly compare with the template until it meets the requirements of the drawing; after checking that all data are qualified, perform groove processing according to the checked circumference and internal total height data; Production of manhole side head: Fix the prepared head parts on the frame, and use a gas cutting knife to cut the rough manhole hole according to the drawing size with a diameter margin; fix the head on the horizontal gantry milling platform, and use a milling machine to fine-mill the manhole hole and manhole groove; Production of manhole long neck flange: Use rough forging blanks to process the inner circle, outer circle and butt groove of the long neck flange; leave an allowance for the flange thickness to be completed after all welding is completed; Manhole neck connection ring production: Use the cut steel plate on the three-roll plate rolling machine to roll the part into a cylindrical shape; spot weld the joints of the cylinder, and after correction, use the submerged arc welding machine to weld; after welding, use the three-roll plate rolling machine to roll it back a second time to ensure that the roundness and diameter of the two ends of the cylinder meet the requirements of the drawing; Manhole flange production: Use rough forging blanks and weld the manhole handle; process the flange's fitting surface and fastening bolt holes; protect the flange's fitting surface with anti-rust oil, and paint the entire flange except the flange's fitting surface; Production of saddle parts: Cutting parts from steel plates; Step 2: Assembly, welding and production; Step 3: Post-weld heat treatment: After all welding is completed except for stainless steel, the tank body is put into the electric heating furnace for controlled heating, insulation and cooling according to the heat treatment process temperature curve; Step 4: Nondestructive testing: According to NB / T47013 standard, all butt welds are subject to 100% RT and 10% PT, all T-butt welds are subject to 100% UT and 100% PT, all fillet welds are subject to 100% PT, and all welds are subject to 100% VT. The RT testing technology level is AB and the weld quality level is II. The UT testing technology level is B and the weld quality level is I. The RT testing technology level is II and the weld quality level is I. Step 5: Assemble and weld the stainless steel pipe: Assemble the stainless steel pipe and grounding column, and use argon arc welding for welding; Step 6: Machining flange: Machining the manhole flange surface and fastening bolt holes; Step 7: Pressure test: Conduct pressure test on saddle plate and lug plate, water pressure test on tank body, and tightness test on tank body.

2. The manufacturing process of the marine ammonia fuel tank according to claim 1, characterized in that: The assembly welding production in step 2 includes the following steps: Step 1: Fix the cylinder on the roller tire frame; Step 2: Assemble and fix the anti-sway plate and the cylinder body, and weld them with solid wire gas shielded welding; Step 3: Fix the head and manhole side head on both ends of the cylinder, align with the edge of the cylinder, and spot weld them in place; Step 4: Use solid wire gas shielded welding to weld the inner groove, and then carbon planer the outer side and use submerged arc welding to weld the cover; Step 5: Assemble and fix the manhole long neck flange and manhole neck connecting ring, and spot weld them in place; Step 6: Use solid wire gas shielded welding to weld the butt girth seam; Step 7: Install the saddle plate and weld it using solid wire gas shielded welding; Step 8: First, assemble the saddle separately. After assembling according to the drawing, use solid wire gas shielded welding to weld it. Step 9: Assemble the saddle and the cylinder. Use manual welding rods for welding except for the narrow angle positions. Use solid wire gas shielded welding for all other positions. Step 10: Assemble the lifting lug and the lifting lug plate to the cylinder body and weld them using solid wire gas shielded welding.

3. The manufacturing process of the marine ammonia fuel tank according to claim 1, characterized in that: The pressure test in step 7 includes the following steps: Step 1: Pressure test of the panel: After assembly, heat treatment, and non-destructive testing, use compressed air to perform a pressure test without painting. Check that there is no abnormal sound or visible deformation in the structure. Check with soap solution for air leakage. The test is qualified. Step 2: Water pressure test of the tank body: After the pressure test of the saddle plate and the lug plate is passed, a pressure test of 1.5 times the design pressure is carried out using water to check that there is no abnormal sound, no visible deformation, no water seepage in the tank body, and no leakage during pressure maintenance. The test is considered passed. Step 3: Tightness test of the tank body: After the water pressure test of the tank body is passed, use compressed air to perform a pressure test at the standard design pressure to check that there is no abnormal sound or visible deformation in the structure. Check with soap solution for air leakage, maintain pressure and no leakage, and the test is passed.

4. The manufacturing process of the marine ammonia fuel tank according to claim 1, characterized in that: The saddle comprises a saddle web, a saddle bottom plate, a saddle long rib plate and a saddle short rib plate. The saddle has long rib plates on both sides of the saddle web, short rib plates symmetrically arranged in the middle, and a saddle bottom plate at the bottom.

5. The manufacturing process of the marine ammonia fuel tank according to claim 1, characterized in that: During the pressure test, the tank body is connected to a pressure gauge, a safety valve, and a pressure pump with a valve, and the tank body is placed on a fixed tire frame for the test.

Images