(a) minimum requirements and procedures for the prevention of corrosion and corrosion on the outer wall and inner wall ofstainless steel pipe fittings and components, and is suitable for new pipeline projects and existing pipeline systems.
(b) the corrosion of the outer wall and inner wall shall be controlled according to the conditions of the pipeline system, combined with the bad environment of the system, and the corrosion control requirements and procedures specified in this chapter. In order to effectively reduce the corrosion, some corrosion control methods need to be used in the use of judgment. In certain circumstances, the provisions in this chapter are allowed to deviate, as long as the company has proved to be able to achieve the purpose of this chapter.
(c) corrosion control requirements and procedures, in many cases require additional measures. Therefore, each operating company should be another program, in order to supplement the requirements of this chapter. Various procedures, including the design, installation and maintenance of cathodic protection systems, must be trained or experienced by the corrosion control methods to prepare, or under the guidance of. The NACE standard RP-01-69, or underground metal pipeline external corrosion under water control system recommended standards, can be used as the preparation and maintenance of cathodic protection monitoring system program guidance, to supplement the requirements.
(d) anti personnel should be equipped with necessary equipment and instruments in order to carry out the work.
(E) anticorrosion insulation team and the inspector shall give proper guidance, and equipped with the necessary equipment, so as to coat and pipe testing and component. Buried line or water pipe external corrosion control.
(a) for the underground or underwater stainless steel pipe system, should be for each component in the system to provide the control of external corrosion on unless operating companies can by experiment, investigation, or experience that the laying of pipelines in the application area, there is no injurious corrosive environment. Within 12 months after the installation of the pipeline system, operating companies to deal with underground or underwater for electrical inspection, if the electrical examination results indicate the presence of corrosive conditions, the pipeline system should be installed and cathodic protection. If you do not install the pipeline cathodic protection system should not exceed 5 years, an electrical inspection, if the test results indicate the presence of corrosive conditions, the system should be installed for cathodic protection.
(b) new device (including new pumping stations, storage tanks and the oil depot, existing pipeline system change the line, replacement, or rebuilding project) underground or underwater stainless steel pipe fittings and components of the external corrosion control should be the effective anti-corrosion and insulation layer supplemented by cathodic protection complete. The stray current, is Yingfu with suitable drainage device. The selection of material, consideration should be given to the auxiliary anticorrosion measures type and environmental conditions.
(c) for offshore pipeline system, should pay special attention to the external corrosion control “splash” stainless steel pipe fittings.
(d) if you can not achieve the provisions on the underground stainless steel pipe fittings and other underground structures endpoint minimum distance of 12 inches, but it has well corrosion control measures, the distance can be reduced.
Source: Zhejiang Yaang Pipe Industry Co., Limited (www.yaang.com)