【Weekly Topic for the Container Area】How to carry out quality inspection during tank installation (December 12–18)?

This post was last edited and replied to by Li Jia Xiao Nu on 2011-12-13 08:09. Reply to 1# Lai Lai: 1. Be familiar with the tank drawings and installation technical documents. 2. Basic preset tracking, inspection of concealed works (keeping records). 3. Basic inspection, removal of the rough surface, placement of shims, and marking for positioning (keep records). 4. Thorough verification of the lifting equipment and auxiliary facilities (for overall installation); for those assembled in sections, the procedures and specifications for sectional construction also need to be verified. 5. Verification and adjustment of the verticality of vertical containers, and verification and adjustment of the levelness of horizontal containers (keep records). 6. Common specifications for tank installation: These specifications can be referred to for intermediate and final inspections. a. Code for Construction and Acceptance of Mechanical Equipment Installation Projects b. Code for Lifting Operations in Engineering Construction and Installation Projects c. Code for Construction and Acceptance of Insulation Works for Industrial Equipment and Piping d. Code for Construction and Acceptance of Anti-corrosion Works for Industrial Equipment and Piping e. Code for Welding Construction and Acceptance of On-site Equipment and Industrial Piping f. Code for Construction and Acceptance of Steel Structure Projects 7. It is advisable to conduct a settlement test on large storage tanks before they are put into use, and to keep records of it. Regarding the data, if it is a pressure vessel, it should be collected in accordance with R0004-2009; for normal-pressure vessels, it is relatively simpler. That’s all I can think of for now; everyone else, please add more.

Xiao Mei: Do you have all the standards you mentioned?

Reply to 3# 15248421341: Try searching on the forum. If you can’t find it, send me a private message and I’ll help you look for it.

This post was last edited by Lai Lai on 2011-12-27 09:57. 1. Equipment installation drawings. 2. Installation record. 3. Things approved through the joint signature of the supervisor, the owner, and the construction unit during installation. 4. Confirmation records for concealed works. 5. Basic inspection, removal of the rough surface, placement of shims, and marking according to the positioning drawings. The organization of the data should follow the specifications outlined in SH5093 ； Thank you!

Simply put: basic handover—tank lifting—inspection and first grouting—inspection and second grouting

This post was last edited by —Lantian— on 2011-12-13 at 17:12. What was said on floor 7 is correct; there are roughly these few steps. To add more details: 1. For the basic handover, it’s necessary to be clear about things such as elevation levels, drainage holes in the foundation, settlement observation points, and their placement locations. During the sand filling process, construction should be carried out according to the drawings. It is specified whether to use ordinary fine sand or some other type of river sand; generally, ordinary fine sand combined with asphalt-treated sand is used. Additionally, measures need to be taken to address water infiltration and settlement, with a slope ratio of around 1/1000 to 1/1500, as required by the specifications. (Concealed works) 2. Lifting and welding of storage tanks – there’s not much to note here; in most cases, anti-corrosion sandblasting is carried out. Certificates confirming the quality of the steel materials as well as material warranty documents are required, and even certificates for the oil measurement ports, manholes, breathing valves, and flanges will be needed later on. 3. There must be records of settlement observation and alignment adjustment from the final watering test for leaks, as well as details of any design changes; in particular, those involving multiple parties need to be kept. 4. One thing that was forgotten is that corresponding records need to be kept for color flaw detection and RT radiography. 5. Additionally, contrary to what was mentioned above, there is no such thing as primary grouting or secondary grouting; only subsequent plastering takes place.

1. The manufacturing and installation of storage tanks must comply with standard requirements； 2. The manufacturing and installation of the storage tank must comply with the requirements of the drawings ； 3. The storage tank must come with a complete and detailed installation quality certificate ； 4. The storage tank upon arrival must come with detailed material certification, welding certification, as well as inspection and pressure testing certificates ； 5. The installation of storage tanks must be carried out by professional, qualified teams ； 6. After the installation work is completed, acceptance shall be carried out by the construction party, the supervisor, and the owner.

This post was last edited by bingxuerui on 2011-12-19 20:49. I’ve never come across these things! But supervision must still be ensured during the construction process! On-site supervision is still quite necessary!

Table of Pre-control Measures for Quality at Critical Areas Sequence Number Project Area Critical Quality Control Points Pre-control Measures 1 Tank prefabrication 1. Materials 2. Layout and cutting 3. … Component processing 1. Verify material certificates; conduct ultrasonic testing on steel plates. 2a. Check the tank layout diagram to ensure it meets the requirements of construction acceptance standards; carry out layout and cutting based on this diagram to maintain compliance with standards. 3a. Inspect the shape and dimensions of welding joint grooves according to the drawings or standards. 3b. Recheck the drawings and layout diagram, and conduct ongoing inspections. 2 Tank assembly 1. Assembly of the tank bottom 2. … Assembly of the tank walls 3. … Assembly of the tank top 1. Before laying the bottom plate, its lower surface should be coated with an anti-corrosion coating. 1a. The butt welds of the arch-shaped plates shall be inspected by PT testing. 1b. The overlapping portion of the three layers of steel plates in the lap joint shall be inspected by penetrant testing. 2a. Wall panel assembly: when the panel thickness is less than 10 mm, the misalignment of the longitudinal seams shall not exceed 1/10 of the panel thickness, and shall not be greater than 1.5 mm. For circumferential gap variable plate thicknesses less than 8 mm, it shall be no more than 1.5 mm; for thicknesses greater than 8 mm, it shall be no more than 2/10 of the plate thickness and no more than 3 mm. 3a. All longitudinal and circumferential seams shall be radiographically inspected in accordance with the specification requirements. 3 Tank Welding 1. Welding materials 2. Management of welding electrodes (wires) 3. Improving the first-pass welding success rate 1. Verifying material certificates 2a. A secondary storage area should be established at the construction site, with materials stored in an organized manner and supervised by a designated person 2b. Establishing rules for signing for, drying, issuing, receiving, and using these materials 3a. Welders must have the necessary certifications to work 3b. Welding procedures must be strictly followed 3c. The construction site should have facilities to protect against wind, rain, snow, and cold 3d. The proportion and locations of weld inspections should be determined according to design specifications, with technicians overseeing the inspections. 4 Tank Filling Tests 1. Preparatory work before conducting water filling tests. 2. Water filling test process. 3. Results of the water filling test. la. Before the water filling test, all attachments and other components welded to the tank must be completed. Paint shall not be applied to any welds related to the tightness test. 1C. During the water filling test, monitoring of foundation settlement should be intensified. 2a. Water filling must be done smoothly and slowly, with segmented filling ensured. 3a. Conduct strength, tightness, and stability tests on the tank walls, bottom, and top in strict accordance with the specified requirements, to ensure there are no leaks or abnormal deformations. 5 Prefabrication of process pipelines 1. Materials 2. Pipeline cleaning and groove preparation 1. Verify pipe materials, welding materials, pipe flanges, valves, fasteners, and quality assurance documents 2a. Clean the pipelines (remove anti-corrosion coatings); they can be released only after thorough inspection 2b. Groove preparation should be carried out through flame cutting or mechanical processing and grinding in accordance with the material requirements 3a. Welders must have valid certificates and must strictly follow welding procedures 3b. Strict rules must be followed for storing, drying, and distributing welding electrodes 3c. Welds can leave the factory only after passing inspection according to specified requirements 6 Fabrication of steel structures 1. Materials 2. Layout and cutting 3. Processing of components 1a. Verify material certification documents 2a. Ensure compliance with design drawings; conduct regular inspections 2b. Assign identification numbers to components 3a. Strictly control the processes of straightening, bending, drilling, and end processing of steel, as well as the associated tolerances 3b. Implement measures to counter deformation 7 Installation of steel structures 1. Foundation 2. Alignment during structure installation 1a. Re-check the foundation upon acceptance 2a. Carefully check verticality and diagonal alignment; when installing components in multi-story frameworks, account for the cumulative tolerances from previous layers 2b. For bolted connections, verify the tightness or check whether anti-loosening measures are in place 8 Welding of steel structures 1. Welding materials 2. Management of welding electrodes 1. Verify material certification documents 2a. A secondary storage area should be established at the construction site, with proper storage arrangements and dedicated personnel in charge 2b. Establish rules for signing for, drying, distributing, receiving, and using welding electrodes 3a. Welders must have valid certificates 3b. Strictly follow welding procedure specifications 3c. The construction site should have facilities to protect against wind, rain, snow, and cold 9 Painting and anti-corrosion treatment 1. Management of handover procedures for anti-corrosion work 2. Preparation of the surface to be treated 3. Quality of paint and solvents 1. Proper handover procedures must be followed for anti-corrosion work; anti-corrosion treatment can only be carried out after pressure testing of equipment and pipelines. For components that require sequential anti-corrosion treatment, both parties involved must cooperate closely, carrying out handover procedures in stages while ensuring proper protection of the work done so far 2. Strictly adhere to rust removal standards; strengthen internal quality control within teams. Inspect and approve the rust-removed surfaces before applying paint 3. Check that paint and solvent certificates are valid