英文版管道安装方案范例.docx

1、英文版管道安装方案范例1.2 Piping installation and construction scheme1.2.1 major construction methods1、 the construction method for metal pipinga、 piping installation and construction procedures pipelines prefabrication proceduresConstruction preparationsmaterial take-overpipelines surface rust removingmarking

2、measures check-upmaterial cuttingbevel machiningweld joints inspectioncoupling and alignmentspot weldcheck-up(weld joints preheating) weldingvisual inspectionPWTcheck and inspection (dimension, hardness, NDT) pressure testprotectionidentification piping installation procedures on the siteDelivering

3、prefabricated piping spools to the siteinside pipes cleaningtubing and support installationpiping spools coupling and alignment and spot weldcheck (dimension, weld opening) (preheating) weldingvisual inspection(PWT) inspection (dimension, hardness, NDT) inside pipes purgingsystem pressure testcorros

4、ion proof and insulationb、 piping cleaning before construction It is necessary to carry out proper surface cleaning of piping regarding specific material and filth conditions, and precautions measures for avoiding environment pollution shall be performed in advance before the cleaning. For carbon st

5、eel and low alloy steel it is necessary to remove the loose scale and eroding by grit blasting. For stainless steel it is acceptable to remove surface iron matter at first, and therefore cleaning remnant foreign matters by grit blasting. It is not allowed to share grinding wheels and files for repai

6、ring stainless steel or non-ferriferous material and carbon steel material. Should be there weld slugs or like that impurity left, it is necessary to use steel brush for cleaning, while to use stainless steel wire brush for stainless steel piping. c、 piping cutting It is necessary to adopt bevel mac

7、hine in notching for piping and fittings, while using semi-automated cutting machine for steel plates. It is necessary to use gauge to check opening angle for steel plates and fittings. Whenever there is different thickness for both coupling plates (between piping and fittings, piping and plates) it

8、 is necessary to machine or grind to needed angles based on drawings or standard maps regulations. For material cutting it is necessary to tailor according to cutting material sizes defined as in figures, while prior supervising unit approval is required when cutting material length is not indicated

9、. It is necessary to confirm marking before cutting commencement, and it is to adopt crayon or special pens to mark material code when two segments to be cutted, and to mark pipelines serial number, weld joints serial number at once after steel spools cutting. And it is required to remove the incisi

10、ons and spurs left by steel material cutting, boring and opening using grinding wheel. It is necessary to use bevel machine or like that machining methods for steel ducts beveling. If there sleeve tubes are required, it is to adopt oxyacetylene torch cutter for opening for carbon steel pipes while u

11、sing plasma cutter for opening and using angle polisher for grinding afterwards for stainless steel. For stainless steel sheets, after cutting by power shearing machine or shearing lathe it is necessary to use manual grinding wheel for trimming along cutting edges. d、 piping bending When performing

12、pipelines hot bending or cold bending, it is necessary to fill and tamp with fine sand, which shall be high temperature proof silicon sand with proper grade and purity. Yet lead pipes are not allowed to fill with sand. Normally, the bending radius of piping is bigger than the external radius 3.5 tim

13、es. For whatever profile section of piping, the difference between the maximum external radius and the minimum external radius shall not exceed the normal piping external radius -8% when piping is undergoing internal pressure, while shall not exceed 3% when piping is undergoing external pressure. An

14、d bended pipelines shall be free of ripples, cracks, overheated and lamination phenomena. e、 support fabrication and installation It is necessary to fabricate piping support according to dimensions prescribed by design drawings and perform rust removing and primer painting, and keep properly with al

15、loy steel material marks after completing fabrication. For finished pipelines support, it is necessary to remove weld knurls and slags and adopt grinding wheeling machine for trimming edges when cutting steel plates, shaped steel and piping by cutters. For finished pipelines racks, it is necessary t

16、o identify their designated numbers with visible marks for distinction purpose. The position of installation point shall be designated as per design drawing or guided by supervising officer for correct installation. Upon the installation attention shall be paid to following issues that whether tight

17、ly connected to components or locked up fast joined with pipelines if using clamps. Upon pressure test and in the process of installation it is necessary to adopt proper protection measures concerning spring devices and etc. special equipment for avoiding enduring overweight load. U-shaped screw cap

18、 shall be locked up as per drawings. It is necessary to make sure that any obstruction to removable parts resulting in dysfunction is removed. The orientation, clearance of binding spot and sliding surface shall be in compliance with requirements prescribed in drawings. It is not allowed to painting

19、 such special sliding surfaces as stainless steel plates, graphite plates and etc. fittings. Upon the installation of anti-violation device and tension resistant support pole spherical surface bearing, the prior confirmation of its properness is needed before welding commencement. For rigid suspendi

20、ng racks, it is necessary to perform the welding under tight coalition condition. For rigid support, the supporting surfaces shall be fully touched and clearance is prohibited for assuring weight of supporting pipes. During pipelines construction process it is necessary to set up temporary support a

21、nd carry out the construction simultaneously for avoiding concentrating bearing load on certain point and reducing root efficiency resulted from attaching several branch tubes to one pipe, meanwhile it is not allowed to make nozzles of equipment as support or carry out erection standing on nozzles.

22、The branch tubes shall be welded only after detailed drilling, angle shearing and grinding as per branch tubes shearing angles. Where setting up steel beams for support, it is not allowed to directly assemble by drilling the steel beam that bears main load on the basis of disparate pipelines dimensi

23、ons and it is necessary to set up according to pipe support position and type as showed in figures. It is not allowed to secure the pipelines temporary support by spot welding randomly on equipment, pipelines and piping for avoiding causing equipment and pipelines impairment. It is not allowed to di

24、rectly secure piping support above expanded iron plates, checkered sheet iron or grid plates, but it is necessary to secure to existing or added girders beneath. It is necessary to compare every group of supports with drawings for making sure that all components are installed and at proper position

25、including temporary support applying to pressure test. For all support components with screw threads, it is necessary to check their operability or potential damages and replace the damaged members in time. For nuts locks and temporary locking accessories of screw components, it is all necessary to

26、check their compliance with prescribed requirements. It is necessary to adjust orientation of the spring for its load and motion graduations are exposed to easily picked up position, and replace the impaired scales in time, but prior to the replacement, it is needed to mark the correct position of s

27、cales to be replaced on the spring shell, so that replaced scales may tally with previous locations. For designing making use of fluids devices as pipelines positioning, say oil pressure anti-violation device, it is imperative to check degree of tightness and fluids volume, should there fluids be fo

28、und insufficient, it is needed to inform the supervising units for replenishing. For certain sliding supports with sliding surfaces being fabricated by graphite, steel or steel to steel, it is imperative to carry out construction as per drawings strictly, and special attention shall be paid to requi

29、rements relating to reserved clearance and pre-dislocation. Upon completing the pressure test, all devices applied to the test, for example locking devices of spring support and temporary supports, shall be removed. For spring supports, it is needed to check to make sure that the load movement indic

30、ator is close to previously designed cold location and pipelines are at correct height. For supports with positioning devices, say anti-violation device and etc., it is also required the movement indicator. f、 piping installation Construction of all ground pipelines shall be carried out strictly bas

31、ed on design drawings, the requirements with respect to dimension tolerance are as follows: regarding linear distance the allowed tolerance shall not exceed 3.2mm for pipelines with nominal diameter less than 250mm（including）, while 4.8mm for pipelines with nominal diameter ranging from over 300mm（i

32、ncluding）till 900mm. For seam steel pipes the vertical weld seams must be staggered and keeping away from manifold nozzles. In the course of coupling and connecting fittings, it is necessary to use spacer plate for the space on welding spot The opening of weld piping manifold nozzles shall not be less than the internal radius of branch tube joint at connected end, while not bigger than the internal radius 4.8mm. When prefabricating pipelines, it is needed to reserve 50mm relating to spot weldi