Description
Even a single piece is used in oil and gas, water and some related industries. For example, one of the main uses is as a one-way valve in the oil industry. When the flow of the pipeline is interrupted, the oil tends to return to its path. In this case, the valve is closed and this prevents the oil from returning to its previous path. In addition to the complexities of the design, the above piece also has complexities in the functional area. The weight of the part is about 13000 kg, so the design of the part should be in such a way that the production part is free of defects. The presence of numerous and complex tests in the said part has led to this part being presented as a high-tech and very important part in the casting industry. The tests of the mentioned part include chemical analysis test, mechanical properties, corrosion test (HIC) and pressure test (150bar). It should be noted that the pressure applied to this part is in the form of impact, therefore, in addition to the fluid pressure, the part must also withstand the pressure caused by intermittent blows. The above part is also important in terms of functional environment. The above part is used in sour gas environment and because this gas has H2S particles. If the production part is not suitable in terms of chemical properties, it is prone to hydrogen cracking and will crack in the long term and can cause irreparable damages. The percentage of sulfur and phosphorus in this piece should be very low. Although according to ASTM A216 grade WCB, the percentage of these two elements is allowed up to 0.035%, but in order to obtain the desired properties and proper operation, the percentage of these elements should be in the appropriate range. The hardness of the part according to its application conditions should be in accordance with the NACE MR0175 standard. Regarding the heat treatment of the part, according to the stresses that are applied to the part during work, it is necessary for the heat treatment and mechanical properties to pass the tests mentioned above.
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