Chemical pump pipe expansion joint material to use knowledge introduction?

Industrial production, chemical water pump pipe installation, the use of the expansion joint are common, the water pump flange connected to the pipe, pipe diameter changes or not long enough, etc are useful to the expansion joint, expansion joint in selecting material for pipe compensation from time to tome what requirements? A, expansion joints selection principle is what? 1, carbon steel and low alloy gold waveform expansion joint is only applicable to t≤ 375℃; Austenitic stainless steel corrugated expansion joint is suitable for the t≤ 500℃。 2, use carbon steel or low alloy steel corrugated expansion joint, the corrosion allowance shall not be more than 1 mm, otherwise, appropriate USES austenitic stainless steel materials. 3, with chloride, sulfide, acid, alkali, etc are prone to corrosion medium or high temperature ( More than 550 ℃) Should be options with corrosion resistant alloy or high temperature alloy to make expansion joint, such as domestic material FN - 2, NS111 and B - 315 or Incoloy800, 825, etc. Second, the expansion joint what are the precautions for the installation of pressure testing? 1, before installation, should check the bellows expansion joint type, specification and pipe support configuration must meet the design requirements. Section 2, with the expansion of the inner tube, attention should be paid to make the lining tube direction consistent with the medium flow direction ( According to the flow of expansion joint sign installation) 。 Plane Angle hinge rotation plane to type expansion joint shall be consistent with the displacement of the plane. 3, the need for & other; Cold spring & throughout; Expansion joint, the prestressing of auxiliary components, should be dismantled in the piping system after the installation. 4, piping installation shall be immediately removed on the expansion joint is used as the installation of auxiliary positioning transportation protection and fasteners, and according to the requirements of design limit device will be dispatched to the location of the regulations, make the piping have ample compensation ability under the environmental conditions. 5, the installation process does not allow welding slag splash to the panel lines tube surface and make the bellows by other mechanical damage. For the expansion of the gas medium section and its connection pipe, make water pressure test, whether you need to consider when water filling of expansion joint takeover can provide temporary support with bearing. 6, in addition to the design requirements of pretension pressure or & other; Cold spring & throughout; Outside of predeformation, it is forbidden to use make corrugated pipe deformation of pipe method to adjust the deviation, so as not to affect the normal function of the expansion joint, reduce the service life and increase the piping, equipment to take over and load bearing components. Expansion joint of all the activities of the components shall be stuck or external components limit their activities at normal action. 7, hydrostatic test water must be clean, no corrosion, and control the content of chloride ions in the water is not more than 25 PPM. After the hydraulic pressure test, as soon as possible to the best of ripples in the water, and promptly put the inner surface of the wave shell blow dry. Third, expansion joint of why do people adopt stainless steel material? 1, stainless steel corrosion to quantity is small, so the thickness of the expansion joint can be designed to be thinner, shan bo compensation amount is larger, 2, stainless steel and plastic is about twice of carbon steel, be helpful for cold forming; 3, under the same service life, the allowable stress amplitude value of stainless steel is higher than carbon steel, in 1. About five times.
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