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I've seen this special texture on the surface of stainless steel parts a lot, however I'm not sure what these marks are called or why they appear on the surface after the part is machined. the texture is easily felt under hand. so I'm wondering what they are and why they show up on the surface...

Hi I have a coupling model that transfers a constant speed and torque. This coupling have 3 type of misalignment (angular, parallel, combined angular and parallel). I have the static structural results of this coupling with each misalignment and constant torque but because of this misalignments...

Hello, I'm wondering how Journal bearings are sealed at the two ends to prevent leakage of the pressurized oil inside the bearing at the start of the rotor operation. because at at that momemnt, oil pressure is supplied by external means and should be more more than the rotor weight to lift the...

Does the mechanical Seal for this type of service require an API Plan and constant cooling and lubrication with sealing liquid? or washing the mechanical seal surfaces before running the pump after each shutdown, suffices?

whats the best way for flushing and cooling the mechanical seal for a seawater service? Attached is the drawing of the pump, its a polymer lined pump for seawater+hcl(2000mg/l) service. Head: 50m...

I have a couple of parts made of Stainless steel 403, the surface is dark magenta/Red color, I'm wondering what type of heat treatment/hardening process results in such a surface. Any hint is welcome. Here's a picture of the parts: http://s30.postimg.org/jaqu0fgu9/hardening.jpg

what is the required Surface finish and Flatness for seat surfaces of Pressure safety valves in high pressure gas service? I've seen PSVs with metal to metal seat design with perfect mirror finish and flatness, however I'm not sure if there's an established standard for it, either ASME or API...

Hello Everyone, We need to polish a narrow ring of satellite hardfacing (5mm width, diameter range of the ring: 2cm to 40cm ) on the base of a cylinder to obtain a mirror finish, but I'm unsure of the process which can give us great wringing flatness and mirror finish. Can this be achieved by...

Hello everyone, API 673 states this paragraph about fans for petroleum industries: "Shafts shall be one piece, forged steel, heat-treated after rough machining. Shafts 200 mm (8 in.) in diameter and smaller may be machined from hot rolled steel. All shafts shall be stress relieved after rough...

Yes, figure 1 is part of the assembly drawing of the compressor and figure 2 is a simplified representation of the laby seal, and in both figures you see interlocking features on the laby and housing. It's not cast into the stationary part, How they fit the laby seal into place should be tricky...

I forgot to mention that these labyrinth seals are made of aluminum alloy.

Hi everyone, I'm tasked with preparing manufacturing drawings of a Co2 compressor labyrinth seals, I have a question about the required Fit(clearance/interference Fit) of compressor labyrinth seals in housing.As you see in the attached picture, labyrinth seal has an interlocking feature which...

The helical gear installed on the shaft induce significant amount of axial force on the shaft, if its supported only by an oil film , doesn't it squeeze the oil film out of the gap, and cause metal to metal friction? http://oi62.tinypic.com/2uj6zcy.jpg

Thanks everyone, specially JJPellin, for clear explanation. Another question I have is about the axial positioning of the shaft, is it only supported axially by the two sleeve bearing faces on an oil film? (is it sinking in oil?)

Thanks tbuelna for your reply, the model of the Oil flinger/labyrinth combination, should be something like this: http://oi57.tinypic.com/2e5jc4p.jpg but as I haven't fully understood the function of the parts yet, it might not be correct.what i'm looking for is the type of fit between the oil...

i forgot to attack the drawing, here it is: http://oi60.tinypic.com/111rx2x.jpg

i have this drawing of a gearbox, which includes a labyrinth type side cover(to seal the shaft) and an oil flinger(i assume to help lubricate the components inside the housing? ) next to it, however i don't understand how this setup works to seal the shaft and lubricate components, and the...

I'm working on a project which involves a high pressure ammonia pump, there are some abbreviations on the drawing that I haven't seen before, what do L.O and SW stand for? here's the Drawing of the pump I'm talking about. Thanks in advance.

Hi everyone, I need help choosing the right SMAW electrode for welding Alform 700M High-Strength low alloy steel to A516, preheat, post heat,current and voltage ratings. any kind of hints is appreciated, as I'm new to welding. Thanks in advance.

Hi Everyone, AC7A-F alloy is JIS AL-Mg alloy, I'm looking for its 5000 series Equivalent. As far as i know, 5000 series are Aluminum alloyed with magnesium, according to IADS (International Alloy Designation System): http://en.wikipedia.org/wiki/Aluminium_alloy According to references I've...