I have some questions regarding medium-pressure steam boilers; could someone help me? Thank you
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1. Does anyone know what type of seamless steel tube should be used for steam pipes in medium-pressure steam boilers, where the normal operating pressure is 4 MPa? What are the specific diameter and wall thickness requirements, as well as the relevant standards regarding pressure tolerance? For boiler rooms with a pressure of 2.4 MPa, what design standards are required? Are there any relevant regulations? . For example, whether to use a deaerator, and so on. . Note: The boiler is a 35-ton steam boiler, with a normal operating pressure of 4 MPa. .
The material selection for steam pipes shall comply with the requirements of Table 3-2 in Article 23 of the \"Regulations on Safety Supervision of Steam Boilers\". For a given medium-pressure steam boiler, with a normal operating pressure of 4 MPa, pipes for steam transmission can be chosen from either the 20#/GB3087 standard or the 20G/GB5310 standard. The pipe diameter is generally determined based on that of the main steam outlet, while the wall thickness should be calculated in accordance with the GB/T9222-2008 standard \"Calculation of Strength for Water Tube Boilers\". The design of the boiler room should be carried out in accordance with the \"Technical Specifications for Boiler Room Design.\" In my opinion, a steam boiler room operating at 2.4 MPa should be equipped with a deaerator.
The material selection for steam pipes shall comply with the requirements of Table 3-2 in Article 23 of the \"Regulations on Safety Supervision of Steam Boilers\". For a given medium-pressure steam boiler, with a normal operating pressure of 4 MPa, pipes in accordance with the 20#/GB3087 standard can be used for the steam pipelines. The pipe diameter is generally determined based on the steam flow rate; once the flow rate is known, the diameter can be fixed. The wall thickness should be calculated in accordance with the GB/T9222-2008 standard \"Calculation of Strength for Water Tube Boilers\". The design of the boiler room shall be carried out in accordance with the \"Technical Specifications for Boiler Room Design\"; a steam boiler room operating at 4 MPa must be equipped with a deaerator.
As per your request, GB3087 standard steel pipes will suffice. At the same time, your boiler’s evaporation capacity has reached 35 T/H; an deaerator is necessary once the capacity exceeds 6 tons, and you definitely need to install one in your case. Otherwise, oxidative corrosion will be severe.
The design of the boiler room should be carried out in accordance with the \"Technical Specifications for Boiler Room Design.\" Your boilers definitely need deaerators; we use atmospheric-type thermal deaerators. For steam pipes at 4 MPa pressure, pipes that meet the 20#/GB3087 standards can be used
If 4MPa steam is saturated steam, carbon steel can be used for the pipeline material； If the superheated steam is used, chromium-molybdenum steel is employed. The boiler feed water must be deoxygenated water.