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Questions about making stainless steel boiler

I am currently working on a project (or actually returning to a project) and need to have a heat exchanger boiler made. The hx boiler will be relatively small, a 10" long cylinder around 4" in diameter. One end can be capped, but the other should…
e6r339b
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Why do steam and diesel engines have differing cylinder configurations?

Consider a fixed steam engine, such as in a Lancashire cotton mill or pumping in a Cornish mine. Then consider a fixed diesel engine such as a large generator or ship's engine. Why does the steam engine have one or two large cylinders with long…
Paul Uszak
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Why do we need to shut down power generators if we are producing more power than the grid requires?

Why do we need to shut down power generators if we are producing more power than the grid requires? How it will damage the system if they are not shut down?
Fred
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Metal micro perforation

I'm trying to design a metal surface with micro-perforation for a product and light it from other side with LED, such that the perforated pattern appears only when lit. In my previous prototype, which used laser drilling (20 micron holes) for…
Aditya
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How do you check a weld for applied moment?

I have a single angle connected to a double angle via a 3/16" weld I know there is a factored, applied moment at that connection. I would like to ask how I can go about checking the capacity of this connection for moment? There is a lot of stuff in…
user32882
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Recipe for Roman concrete

I recently read in an online article, that researchers have found the recipe of concrete used by imperial Roman architects. The cited article however uses a recipe described by Vitruvius, which is 2,000 years old. So how exactly is this finding the…
DaPhil
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Is there a relation between porosity and PPI density in porous media?

I've seen two methods to describe porosity of porous media (specifically metal foams): Porosity $\epsilon$ which is a ratio between volume of voids and total volume of the medium. PPI (Pores Per Inch) which is the number of pores in one linear…
Algo
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How do you model a real-life truss in structural analysis software?

I am trying to recreate the following model of a wooden roof truss provided to me by a truss manufacturer: My question is twofold: What is the common/correct way to model the boundary conditions and internal fixity conditions (pin pin?) for the…
user32882
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Under what circumstances would one need or not need an electronic brake for a permanent magnet motor?

My company was asked to design a custom product several years ago. The original requester never bought it, but we've sold several a year through distribution. It's been a small side-line for a while, but we'd like to understand the broader use and…
Stephen Collings
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Connections between RC retaining walls and sheet pile retaining walls

I'm working on a flood defence scheme in which a section of RC flood wall becomes sheet piles. The reasons for this aren't important, but the solution isn't to simply make all walls one or the other. My issue is how to connect these two very…
Smeato
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Unexpected Results from my Transfer Function

I have a system that can be modeled with the following picture: There is a mass $m$ connected to a spring $k$ and a dashpot $d$. These are both connected to another dashpot $c$. A force $F(t)$ is applied at the junction. After some effort tackling…
anonymouse
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Is it possible to replicate a Tesla valve in large scale?

Supposedly a Tesla valve will impede fluid or air flow in one direction whilst allowing flow to move freely through the valve entering from the opposite direction, without using any moving parts. Also the alleged effectiveness of the valve is based…
James
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How is biaxial bending considered for reinforced masonry design?

I am faced with a problem where I have to design a reinforced masonry beam for biaxial bending. The governing code is ACI 530-11. I cannot find a provision in this Code for biaxial bending. The only part that addresses this issue is in Section…
user32882
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Energy of a 3D Timoshenko beam

I am interested in the kinetic energy T and the potential energy U of a three dimensional Timoshenko beam. For a 2D Timoshenko beam the energies read: $$ T = \dfrac{1}{2} \int\limits_o^l \left( \rho A \left( \dfrac{\partial w}{\partial t} \right)^2…
Ferdi811
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Force in a crank system

Statement In a crank system, as described in the picture, we know the values of: the width of the connecting rod ($m$), the width of the crank ($b$), the torque in the crank ($M$) and the angular velocity $\omega$ which we apply to this torque. We…
JnxF
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