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@IceStationZebra: Do you think those different filter symbols represent any filter property difference?

@IceStationZebra: Thanks so much for your comment. This seems fit best to my case.

Dear srini1785, The right part of it seems like the valve, but what I would like to ask is the left part (the square shape with oblique dotted line). Have you ever seen this symbol?

@mk3223, I guess it is a filter as well. But I see nothing similar by searching on various standards.

Hi everyone, As I am reading the paper for my work about cooling air path, there is a pneumatic symbol at the end of the air path that I do not understand (there also lack of necessary wording description). I attach its picture here and the system drawing here. It seems like a filter but the...

Thanks Acosta and Dave, Yes, it is not in accordance with ASME Y14.5 OR ISO standard. I guess that it is the brief writing of coordinate tolerancing, like the Figure 3. I am finding the way to locate my 2 rotating together disks using dowel construction (36 holes circumferentially distributed...

@3DDave Yes, this is the document for training GE engineers, so just assume that it is serious. Do you mean the Hole true position = +/- .0005 nomenclature? It is called coordinate tolerancing. I found the comparison between old coordinate toleracing vs modern GD&T here. (Figure 3 versus Figure...

@Drawoh, Thanks for your support. Actually there are numerous bolts (for example, 72) distributed equally in the circumferential direction over a disk. And these bolts are used to locate and connect the 02 disks. I analyse this fit hole/bolt diameter and I find out that this fit (-.0001"...

@3DDave: There is an old style of positional tolerance, which is made by +/- (coordinate tolerancing) This equation is cited from the book "Jet Engines and Propulsion Systems for Engineers" - General Electric, page 3-57. http://library.lol/main/CB568B69136A85121F545E5AB84ECA88 So I think it is...

Hi everyone, I am reading the old gas turbine engine book and I am in trouble to understand their definition of positional tolerance and “total fit” in doweled rotor. Problem: bolts are used to concentrically locating 02 disks stacked and transport between them in gas turbine engine. Bolt has...

Hi everybody, At this moment, I am looking for a suitable flowmeter for compressed air discharging from a tank via a pressure reducing valve with the following characteristics: Pipe size: DN100 with flanges Flow rate: Up to 5400 kg/h (1.5 kg/s) of 3-5 bar pressure compressed air after a...

aniiben, As chez311 mentioned, a few percent of compression does not matter. Usually the rubber O-ring itself varies vastly in sizes (AS568 standard), so in Parker guide they said compression ratio from 20-30% is ok. Here is my gland design for AS568-012 O-ring complying to AS 5857 groove...

Dear pylfrm, "Locational transition fits typically allow some clearance. Treating the spool assembly as a single rigid body seems rather questionable if that's the case. Maybe I'm missing something though. I'm not familiar with these machines." Yes, you are right, I just checked it again. The...

Dear pylfrm, "Presumably you could measure runout of datum feature D with respect to D-E, where datum feature E is the feature on the left end of the 4th shaft that locates it relative to the right end of the 3rd shaft. Similarly, you should be able to measure runout of datum feature A with...

Dear drawoh, Between B and C is the continuous, single shaft. It looks like that because I over-delete some details because my colleagues ask. Let me make it clear: On the left hand side of A is the 1st shaft (grey color) Shaft seat A is on the 2nd shaft, this shaft is spline coupled to inner...

Dear pylfrm, "If the runout is actually controlled at the individual part level, what is the purpose of runout tolerances at the assembly level?" Let me explain more: - Things will be simple if the spool is a single shaft with 2 bearings (no assembly), one at each its end. Supposed their...

Dear pylfrm, "Can you post an image showing a section view of the spool assembly with the bearing seats and spline connections labeled?" I attach here its picture for you guys' reference. I have to hide many of its details but I hope that it is still clear enough for my question. A, B, C and D...

Dear drawoh, "You are asking about datums A, B, C and D. I only see A and B. As per ASME Y14.5, the two datum features together define a centre axis. If you define one of the perpendicular faces as datum C, you will have immobilized your part. This is what datum features must do." No, I do not...

Dear drawoh, "The run-outs specified on the perpendicular faces are meaningful as per ASME Y14.5-2009, the standard I just pulled off my bookshelf, and they are measurable. Is this really critical?" Yes, it is what required by the bearing manufacturer such as SKF. So I think these axial runout...

Hi everyone, I am a young engineer so I would like to ask you guys’ experience in real practice cases. At the moment I am analyzing a gas turbine spool containing 04 shaft sections spline coupled and there are 04 bearings on the spool. Three (03) of those bearings are on the same axial positions...