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thanks all for providing their insight views, i know that there are lots of factors which influence shrinkage behavior of casting, but i want to know how u approach to make the pattern/die of any part, like i have casting part of which i need to make sand casting pattern, i usually make 3d...

Hello all, i just wanna know some deeper stuffs on how the casting shrinkage in solidification stage works and what are the factors which affecting it. like we design sand casting pattern/dies and for steel we use 1.5% shrinkage as per industry norm on pattern. but while inspecting we find that...

btrueblood, i want to ask one question as the disc spring will be stacked, how to be it suppose to stack like in series or parallel or combination of both? what are the decisive factor to consider which stacking is suitable?

thanks, btrueblood for information. yea I'm looking for for all those mentioned reference.

brtueblood, can u provide any reference for disc spring design shown in figure, I have literature of helical coil spring design.

hello, dave the line "The previous attempt, using turns of the nut, resulted in variation of 50% to 200% of the desired load" what's mean by that?

Hello all, i need some guidance on solving a numerical problem, we are currently doing packing compression test as per API 622, picture attached below of sketch of test setup fixture. as u can see in picture, packing is compressed by tightening bolt & nut which is putting force on spring through...

littleinch, i want to ask can i use slotted hole instead of this design? like I read in API product standard that you can't use slotted holes, so in perspective of the standard am i allow to do this? need to confirm it. thanks

littleinch thanks for replying, the line u mentioned "Why have the nut fixed and not just use a spanner on a flat edge?" what does this mean?

this one 3d model

Hello to all, i need some clarity and healthy discussion of one design change intitation which i want to implement on 2-piece ball valves. as shown in two pictures, there's gland flange bolting of 2-piece 50mm class 150 cast steel floating ball valve, as shown there currently gland flange...

Thanks, littleinch for clarity, now i understand.

hello to all, we have pretty huge range of valves & pipe fitting products. our company potentially looking to sell products in Australia/new zealand markets. i have come to know that we need to comply with water supply code of AUSTRALIA/NEW ZEALAND,WSWA. if i talk about specific standard, it is...

Littleinch, flange design input condition means i have all the flange dimensional parameters along with operating condition information. i was analyzing mating pipe information, where i have given WT-25.4mm, internal corrosion allowance - 6mm, pipe wall thickness given in the sheet is...

IT COULD BE

thanks SJones and LittleInch for replying, i have a Technical data sheet of flange design calculation in which WT=25.4mm but to calculate pipe wall thickness it was shown as pipe wall thickness = 25.4-6= 19.4mm i couldn't be able to figure out that why they subracted 6 from WT.

Hello to all, i have one minor doubt which sound bit naive to you, i have a flange input design condition and need to design based on that. this is butt welded flange with design pressure, temprature and size given. But there is one more input which is written WT=25.4mm, what does this mean?

Thanks compositepro, yea it could be one of the reasons, i will talk to production department about this and observe in detail to see what's really going there.