Steel Pipe production design

Pipe production design

 

Pipe production design of piping systems for nesting and staging design, after bending, beveling, welding, heat treatment, inspection, marking, clean, paint and protective processes in the factory (workshop), to create a product.

 

Domestic power plant construction requires pipe maker according to the drawings provided by the Design Institute production design of the piping section includes the main steam, hot reheat, reheat cold section, the main water supply pipes, high-pressure bypass pipe and low pressure bypass, four Extraction pipeline, slurry pipeline corrosion. For more commonly used, less precision processing pipeline, and some foreign suppliers for the factory pipe in the form of supply to the scene, the scene is only responsible for the installation; and our general contractor is basically a domestic power plant construction in a manner consistent to construction, that is the direct procurement of the project all the materials needed by construction unit segment in the field, you can take full advantage of the material, easy to transport, pipe production design time savings, due to design errors caused by changes in The site is also very easy to modify the use of existing materials. Nuclear island with more stainless steel pipe, the basic raw material is purchased, the production of the production workshop in the vicinity of the nuclear power plant piping, installed directly in the nuclear island plant. This in several ways have their advantages and disadvantages, and is closely related to the contract documents, transportation costs, installation, labor costs, local industrial development situation, careful analysis needs to be based on the actual situation of each project.

For more commonly used, the pipeline processing less precision direct procurement in the field section construction. The advantages of this approach is more pipe makers Tube Manufacturing, beveling, pipe fittings manufacturing standards, processing specifications, as well as domestic and imported materials, materials, specifications, scale length and other related information to grasp with control plot design their scope of business experience. However, due to the piping system design, stress calculation is carried out by the Design Institute, the pipe makers need to provide relevant technical information in accordance with the Design Institute of the pipe, the pipe makers need to get supply contracts familiar with the drawings to begin pipe production design, the transfer of the pipe production design with long design cycles.

Piping Design technical requirements

Piping Design Pipeline makers should be based on the piping system layout and location of the Design Institute of detailed piping design. Commonly used computer-aided design system, the the pipe master plan to draw three-dimensional piping systems and pipe sections detail.

According to the Chinese power industry standard power plant piping (DL / T 850-2004) and Synergis, Belden, Manchu and Han hi to Ya, the Daya Bay nuclear island, the Taishan nuclear island, Ningde nuclear island factory production, piping production drawings should pipe production Master Plan, pipe sections detail the pipe section processing list and break processing a list of.

Pipe production master plan should reflect the following: the pipeline route; elevation of each node of the pipe supports and hangers elevation; welding position and the number of welding and welding plant or on-site welding; medium flow and slope; the size of the total length of the pipeline, sub- the size of the segment size (including adjustments above) and supports and hangers and take over the seat (including socket);-ray the inspection radiation source hole location; creeping inflation measurement point position; pipe sections, pipe fittings, welded joints, and supports and hangers Number ; positioning between the columns and equipment of the pipeline with the main plant size; pipeline list; groove requirements; installation instructions and technical requirements. The pipe production master plan generally use three-dimensional installation layout.

Detailing pipe production design total figure drawing tube segment production, production detail of the pipe section should should reflect the following: pipeline specifications, material; each take over the seat hole location, size and welding requirements; each piece of the pipe ID, specifications, materials, weight, geometry and detail; weld weld number, groove number and groove detail; medium flow of each pipe section; welding and heat treatment requirements; soldered directly to the location of the pipe piping accessories, size and welding requirements; inner surface of the processing requirements; inspection and marking requirements.

Summing up the experience of the above works, Piping Design technical requirements are as follows:

(1) Piping Design to take full advantage of the existing pipeline construction drawings, and piping design requirements need to supplement and improve some of the content on the pipeline construction plans;

(2) Piping Design segment to the pipe, and welding is a welding plant or field welding. Meet the transport and installation conditions should be as factory welding. Usually limit the length 12m, width within the range of 3m or consider the use of an elbow band has been pipe segment;

(3) try to set the field weld location above the platform installed in close proximity to the site or other easy to install location needs to be determined according to the actual layout;

(4) dissimilar steel welding all completed in the factory;

(5) In order to consider the civil construction, equipment interface changes and the pipe section processing error caused by the pipe section assembly deviation, set the necessary adjustments to the appropriate location in the piping segment (usually set at the site weld). Three-dimensional piping (try not to use), should be set to adjust the segment of the x, y, z three directions;

(6) pipe used in the design and the system identifier pipeline identification system encoding. All integral parts of a plumbing system (including tube sections, welded joints, hangers, pipe, elbow, tee, head size, flange, pipe jacks, the creep measurement points, shift indicator components) It should be numbered, so as not to cause confusion in the factory or in the field;

(7) pipe production design drawings factory production material under drawings, piping layout of each details are need is the actual order data of the project, strict contract to the order of the fittings (such as valves, compensators, orifice plate, table meter) data;

(8) of water, thermal control sampling, dosing nozzles and thermal control of pressure and temperature measurement points to take over the location and type of water, determined by the thermal control and provision of capital with. Recommended standard plot style;

The pipe section in the Master Plan (9) pipe, pipe fittings, weld and hanger No. legend symbols, groove requirements, installation instructions, and technical requirements of a standard format, automatically generated;

 

(10) pipe sections produced Detail Figure welding and heat treatment requirements, the inner and outer surfaces of the processing requirements, testing and marking requirements are also required to be made standard format, including various types of groove detail can also be made to the standard type, a separate plot, the show is not piping design detail.

With the rules of the tube segment:

(1) piping design must be designed in strict accordance with the slope of the Design Institute of pipe (lines) and engineering construction standards mandatory provisions welding requirements, guaranteed to meet the design and emphasize requirements put forward bends (elbows) angle correction (if any).

(2) Piping Design, to take full account of the difficulty of manufacturing conditions of transport limitations and ease of installation. To minimize the generation of solid angle, guaranteed straight pipe and fittings in the same plane, reducing the difficulty of manufacturing. Domestic projects piping to consider transport requirements, control 12.5 meters in length, width control in the 2.5 to 3 meters. The recommended size of: 12.5x2x2 range; The projects abroad pipe exits shall consider cage installed or container. Cage, cage size 12x3x3 meters, a cage limits hold 20 tons; such as container, according to the standard size of the container.

(3) In determining unit Break the overall dimensions of the pipe member, but also consider that its stiffness can be guaranteed without permanent deformation after lifting, or to add temporary fixing measures;

(4) equipment, valves, compensators, orifice plate, thermal control instrument and its attached anti-flanges and fittings equipped with the equipment, etc. for the junction require the use of on-site welding;

(5) as far as elbows, tees, valves, size of the first-class formation of tubes at the scene solder joints;

(6) On-site welding to make the straight segment + elbow in the form, and as far as possible is a flat together;

(7) at the flange connection to the implementation of the counter-flanges and fittings supplied with the device, along with the equipment supplier, not in the material table be kept separate; otherwise a detailed breakdown;

(8) Since the system requirements in the pipe companion flange, the pros and cons on both sides of the flange should adopt the factory welding;

(9) Mark-site welding from the platform, hangers, wall, holes equidistant;

(10) On-site welding, factory welding positioning and labeling, according to the flow direction of medium order number in the bracket with pipe welding also sequentially numbered in order of medium flow;

(11) located on the partition wall, the floor of the pipe segment is not set to the weld;

(12) two-stage pipeline groove forms and sizes, in addition to meet the specifications of the power sector, will be based across the weld different materials to determine whether it is necessary to set the transition section to ensure that field welding with steel welding.

(13) pipe section set the creep measurement points to ensure that the selection of the actual wall thickness of the pipe system thinnest same batch of steel, not less than 3000mm in length, to ensure that no openings in the pipe section, do not install the instrument socket, also guaranteed not to install the supports and hangers.

(14) perforated pipe field joints and holes from the edge of not less than 100 mm;

(15) with anti-corrosion lining pipe subparagraph requirements of the proposed factory material segment, or commonly used sub-standard fragment.

(16) To a reasonable set of tuning segments: process material brought a small error in the installation and construction of major civil construction error, generally through the wall, holes, etc. straight section reset the adjustment period;

(17) the need for welding pipe bracket, the department mark, see: enter the bracket needs and pipe welding to see xxx supports and hangers branch part;

(18) and thermal control, chemical interface boundaries: the isolation valve before the pipe section at the outer surface of the main pipe insulation layer lengthened 100mm;

(19) that need to be welded on the pipe supports and hangers saddle detail;

(20) openings in the pipe thermistor mouth with tubules interface, and the interface of the other pipeline in FIG identified interface dimensions and FIG. No.;

(21) the serial number of materials on a straight segment, pipe fittings, pipeline equipment; each class according to the medium flows sequentially numbered;

(22) Piping Design experience long straight sections, as far as possible according to the length of the tubes a 5 or preparation. The size marked in the figure does not consider the various types of aberrations confirmation owners and other units.

(23) dimensioning shall be marked with pipe fittings, hangers, valves and piping accessories position size, and the location of the weld size, so that it can determine the length of the straight pipe.

Of Piping Design 4 Design Institute to carry out the recommendations of the construction side

1) the four pipes due to the use of imported materials and domestic practices of material sent to the pipe factory, pipe factory according to the actual arrival design, processing, and does not decrease the amount of material loss, it is recommended that this section is still referred to piping plant design, processing ;

2) pipe production design drawings factory production material under drawings, piping layout of each details are need is the actual order data of the project, engineering and construction side should before with control plot publishing all the pipe pieces in the pipeline (such as valves, compensators, orifice plates, meter, etc.) order;

3) related to the purchase of imported equipment, the Design Institute piping Break design needs to be based on some of the equipment manufacturing standards, it is recommended to determine the mapping of the design of piping with control pipe producers;

4) recommended by the manufacturer responsible for reserved adjustment segment, because the on-site installation and construction of both the construction error, pipe manufacturing plant material accumulated error.

5) that need to be welded on the pipe supports and hangers in the segment fully consider the length of the solder bumps, and be Remarks;

6) actually the Design Institute piping design factory piping design is there are differences in the, such as some tubes, valves, etc. is also not complete the Design Institute piping design may be appropriate to simplify the completed part of the work, the rest by the pipe factory or the completion of the construction unit. Such as requirements for welding and heat treatment, surface treatment,-ray source position, testing and marking are not generally the scope of work of the Design Institute.