May I ask what the cost ratios of materials to labor are for manufacturing pressure vessels and vessels operating at atmospheric pressure?

I only know that it used to be a part-time job, but now labor costs have increased.

For ordinary carbon steel, the cost of materials and labor is split in half; for stainless steel, it’s 37% for each. However, the equipment quotation, the proportion of forgings used, and the structural design all have a significant impact on these figures. Calculating based solely on the ratio of materials to labor can sometimes lead to large discrepancies

The last edit to this post was made by kareale88 on 2019-2-28 at 20:07. Let me tell you a rough but relatively accurate method: list the weights and unit prices of the main materials used in the equipment (such as cylinder heads and forgings) to calculate a price; then subtract those weights from the total weight to determine the weight of the scraps, and from that you can get an approximate cost for the materials. This approach results in a cost that is not too far off. I created an Excel spreadsheet myself, which makes it very convenient to generate quotes. As for labor costs, there are significant differences among different companies, depending on the volume of equipment and the management style; it is advisable to consult the partner company for accurate information.

The amount of scrap varies randomly, so it’s impossible to calculate it. The total weight indicated on the design blueprint doesn’t include the scrap, right? Which total weight should you use, then, by subtracting \"the sum of the weights of each main component multiplied by their respective unit prices\"?

You might have misunderstood what I mean by \"scrap materials\". By that, I refer to components such as struts, shims, and supports – non-compressive structural elements – because these parts account for a relatively small proportion of the total cost. Additionally, when calculating the weight based on the details in the blueprint, a correction factor for material utilization rate must be applied; this factor depends on experience and the structure of the component. For example, in the case of end caps, the weight should be calculated based on the unfolded square shape of the material (we generally use 1.2 times the net weight). An appropriate management fee should also be added to the price of purchased finished components. There’s another critical point to be aware of: it’s best to calculate the weight of the main components shown in the blueprints based on their dimensions. One of the large design firms we work with often makes mistakes in its drawings; for one particular steel forging, the weight was calculated as being more than a ton less than the actual value...

Could you explain what exactly \"stainless steel 27\" means? Thank you

Please provide a detailed explanation of the 37 starting materials for stainless steel

Generally, it’s the weight of the materials used in the manufacturing process multiplied by the processing cost: 5,000–7,000 T for carbon steel, and 10,000–13,000 T for stainless steel. The exact amount depends on the labor required for the equipment; currently, labor costs are high

This post was last edited by karament on 2019-3-2 at 10:42. This kind of assessment seems a bit vague; the difficulty of manufacturing equipment varies greatly, as some devices have internal components while others don’t. Moreover, when it comes to stainless steel, isn’t manufacturing thin sheets more difficult than manufacturing medium-thick sheets?

It’s harvested, :) Thanks to everyone for their enthusiastic replies! :)