Project completion data control: the completion data includes: 1.
Seamless steel pipes commonly used in pipeline engineering include the following three types: (1) General seamless steel pipe is made of ordinary carbon steel, which can be divided into hot rolling and cold rolling (drawing).
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The construction organization design prepared by the construction unit must be approved before construction; 3.
Store and keep materials and equipment and protect finished products.
It is mainly used for water supply and air conditioning water system pipes.
After the completion of subdivisional works or concealed works, they must pass the self inspection, the quality assessment of subdivisional works, and the supervisor and the owner shall be invited to conduct acceptance (inspection batch); 5.
The drawing is marked as DN** ×**、 For example, dn57 * 4 and dn159 * 6 represent outer diameter and wall thickness, which are mainly used for heating, fire fighting, air conditioning water system and process pipeline.
After the water surface drops 15min after water filling, the water surface does not drop for 515min after observation, and the pipes and interfaces are qualified if there is no leakage.
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Coil welded steel pipe: there are two types (1) spiral seam welded steel pipe: the spiral seam is manufactured by automatic submerged arc welding of carbon steel plate, which is divided into class a pipe and class B pipe according to the pressure of conveying medium..
The open water tank shall be subject to water filling test, the water filling test shall be kept for 24h, and the closed water tank shall be subject to hydraulic test.
The main contents of construction drawings include: layout plan, drawing catalogue, description of each discipline, plan, system diagram, detailed drawing and atlas.
Valves: strength and tightness test must be carried out before installation: 10% of each batch of the same brand, model and specification, and no less than 1.
The welded steel pipe is marked with DN * *, such as DN20 and DN100, which is called the nominal diameter, indicating the approximate internal diameter of the pipe.
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(3) Made of alloy steel seamless steel pipe: mainly used for special process pipeline.
It is the main basis for engineering survey.
Completion settlement agreement or approval form, financial statement, payment plan.
The maximum nominal diameter of cold drawn (rolled) pipe is 200mm, and the maximum nominal diameter of hot rolled pipe is 600mm.
Commencement report, commencement notice, construction period change report (including construction period commencement delay, delay witness data and price claim) and approval documents; Construction site floor survey; 2.2 cost adjustment report and approval documents for design change and project negotiation; 2.3 certification data, price report and approval documents of other matters outside the contract agreed by the construction unit; 2.4.
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The heat exchanger shall be subject to strength test, the pressure shall be 1.5 times of the engineering pressure, the steam working pressure of the steam part shall be + 0.3MPa, and the test pressure of the hot water part shall not be less than 0.4MPa; 6.
Strength and tightness tests must be carried out for valves on main pipes and special valves one by one; The strength test pressure is 1.5 times of the engineering pressure; The test pressure of tightness test is 1.1 times of the engineering pressure.
Construction organization design: the approved construction organization design, and the changes and adjustments to the construction organization design during the construction process.
Before construction: bidding documents and Q & A, project contract, bid winning quotation and economic agreement.
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Material and equipment certificates, inspection reports of materials submitted for inspection, witness and test records.
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Color marks have been made, hoping to be useful to you! Drawing recognition: drawing recognition is the premise for the budgeter to measure the quantities.
Seamless steel pipe: seamless steel pipe is divided into hot rolled pipe and cold drawn (rolled) pipe according to the manufacturing method.
Welded steel pipe: welded steel pipe is a pipe made of rolled tubular carbon steel plate through butt welding.
Common building materials: (I) pipe 1.
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It is used for low-pressure fluid transmission pipeline, mainly used for heating, fire fighting, rainwater, air conditioning water system and process pipeline.
during construction.
Mobilization acceptance of materials and equipment: when materials and equipment are mobilized, relevant personnel of the construction unit shall conduct appearance and internal product quality acceptance (including specification, model, quantity and packaging), and compare with samples.
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Construction scheme (key large projects) and technical disclosure of subdivisional works.
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There must be professional engineering technical disclosure before construction; 4.
It is marked with welded steel pipe as shown in the figure.
Quality control of construction materials and equipment products: 1.
The supervisor is requested to inspect and certify the main materials, finished products, semi-finished products, accessories, appliances and equipment, and send the important materials to be retested or witness the test.
Certification of the event of breach of contract claim, claim information report, service witness evidence, evidential data and approval documents.
The water filling shall not be lower than the upper edge of the bottom sanitary ware or the bottom ground.
The application scope is large, including station pipeline, outdoor pipe network, process and heating pipeline.
System diagram: it mainly shows the spatial relationship diagram of system pipeline, such as spatial direction, number of floors, pipe diameter, connection mode of vertical and branch pipes, valve position, connection between equipment and facilities and pipelines.
As built drawings: make a real response to the actual construction of the project.
Commissioning (such as heating system commissioning) and test (test on important systems such as fire fighting and safety prevention).
(2) Seamless steel pipe for low and medium pressure boiler: seamless steel pipe is made of high-quality carbon steel or alloy steel, which can be divided into hot rolling and cold rolling (drawing).
There were two kinds of hot-dip galvanized steel pipe and cold-dip galvanized steel pipe.
In process pipeline engineering, when the diameter exceeds 57mm, hot-rolled seamless steel pipe is often used, and cold drawn (rolled) pipe is often used when the diameter is less than 57mm.
The construction must be carried out according to the construction drawing design documents, and the change or change must be through the change notice issued by the design; 2.
Meeting minutes, drawing review, technical disclosure records, design changes, project negotiations, notices, etc.
Connecting pipe for low pressure boiler manufacturing.
Data control of materials and equipment procurement process: Manufacturer qualification, product inspection certificate (pay attention to the variety, specification, model and validity period of inspection products in the inspection certificate), factory certificate, and tracing and marking of copies; Determine the sample.
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Inspection of key materials and tightness test: 1.
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Generally, the atlas name and number are used for description in the design, rather than drawing detailed drawings.
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After meeting the requirements, the supervisor and the owner shall accept and evaluate the overall project.
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Layout plan: it is a plan showing the building location, building red line, four positions of buildings and the relationship with surrounding buildings.
Details: non-standard layout details, plane node details and parts processing drawings.
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Galvanized welded steel pipe: galvanized welded steel pipe is made of carbon steel.
Description of each discipline: general construction drawings include construction, structure and installation description drawings, involving project overview, design economic and technical indicators, design intention, designated practice table, building material requirements, equipment selection and icon table.
Second, the construction personnel shall construct according to the standard atlas.
Project construction process control: 1.
The text is as follows: This paper makes the following summary according to the actual operation of netizens on the Internet.
After the radiator is composed or the whole group of radiators and radiant plates leave the site, a hydrostatic test of 1.5 times the engineering pressure shall be conducted before installation, which shall not be less than 0.6MPa.
Economic documents during construction: 2.1.
After the overall completion of the special project, water flushing, water supply test, water shielding test and tightness test shall be carried out.
Atlas: it is the standard construction Atlas method specified by the design.
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The concealed or buried drainage pipes must be subject to water filling test before concealment.
There are predecessors’ summary, their own practical experience, and key knowledge.
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It is qualified if there is no leakage for 10min under the test pressure; 3.
The drawing is the same as that of welded steel pipe.
Plan: it shows the plane layout of horizontal pipes, risers, equipment, facilities, valves, fixed supports, inlet positions, pipe diameter change marks, name and number marks on each floor.
Drawing Catalogue: a single page drawing indicating the drawing number, drawing name and number of drawings of each discipline, so as to find, check and count.
Economic documents: 1.
Construction inspection record (inspection lot) acceptance record.
Strength test shall be conducted for the heat collection and discharge pipe and upper and lower water pipes installed with solar collector, and the pressure shall be 1.5 times of the engineering pressure; 5.
