The requirements of plates and pipes are in titanium pressure vessels

Keywords :titanium pressure vessel/ titanium/application 

A new fuel gas conversion unit of a petrochemical company needs an ammonia vapor buffer tank, whose materials include NH3 and water, as well as trace H2S and CO2, Because titanium alloy has excellent corrosion resistance, high-temperature resistance, and high strength, its specific strength is 3 times that of stainless steel. Therefore, the owner selects titanium to manufacture the equipment, which shall meet the requirements of TSG 21-2016 Supervision Regulation on safety technology of fixed pressure vessels and JB / T 4745-2002 titanium welded vessels. The material of the main pressure parts of the equipment is TA3, the design pressure is 0.6 MPa, the design temperature is 140 ℃, and the monthly average minimum temperature in the place of use is - 16.1 ℃ (the lower limit of the allowable temperature of titanium is - 269 ℃, the upper limit is 300 ℃, which fully meets the temperature requirements).

The container requires that the plates and pipes should be made of TA3 titanium, the design standard of titanium and titanium alloy plate is GB / T 3621-2007 titanium and titanium alloy plate; The manufacturing standard of titanium pipe is GB / T 3624-2010 titanium and titanium alloy seamless pipe. The material supply status requires annealing (Russian titanium shall not be used instead) and seamless pipe shall meet the requirements of the JB / T 4745-2002 construction standard. Since JB / T 4745-2002 standard is implemented earlier, the supervisor can suggest the designer add a description of using the latest version of the material standard.

Before the titanium plate is put into storage, the chemical composition, mechanical properties, and process properties shall be inspected according to the requirements of GB / T 3621-2007. Inspect the appearance quality and dimensional deviation of plates one by one. When the size and appearance quality are unqualified, the plate is unqualified; When the chemical composition is unqualified, the batch of products is unqualified. Take 2 sheets from each batch of plates, then take 2 transverse samples from each plate,, and test the mechanical properties and process properties of 4 samples (if there is only 1 plate, take 2 samples) respectively. If one sample is unqualified, double the number of samples shall be taken to repeat the test. If one sample is still unqualified, the batch of plates shall be unqualified. At this time, the supplier is allowed to repeatedly inspect the unqualified items one by one, and the qualified items are regrouped and warehoused in batches. Pipes shall be subject to similar inspection according to GB / T 3624-2010 standard, and they can be numbered and put into storage only after passing the inspection.