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I have aluminum silos for holding plastic pellets built to DIN 4119 (which I currently don't own). Per the drawing, they were built with a 0.5 psig overpressure. There is a pressure-vacuum vent valve on the top. The setting at 0.5 psig will provide insufficient relief capacity based on a...

So, how do I do this manufacturing Metalguy? I simply buy some 4340 rod and plate, weld it up, and then...??? Where would I send the finished piece(s) to have them heat treated? We do have a steel manufacturer right down the road. Who else will simply heat treat? Mark

Hmmm...don't know. I can tell you that the pin is approximately 2" diameter and 12" long. There is a flat rectangular plater welded to one end which keeps the pin oriented in one direction. The other end has a hole and a cotter pin so that it stay secure while coupled. Mark

We have had some train coupler pins failed over the past few years and I have been asked to do something about it. The pins fail at the top where an alignment plate is welded (weakly) and also in the middle where push/pull is applied. The failure mode for the latter are simple double/reverse...

Has anyone ever found a way to detect problems with cardan shaft bearings? Is there enough energy and contact to transmit cardan shaft bearing faults through to the nearest machine bearing? Mark

I gather that the DBT goes both ways, but I am not sure. Most of the texts that I have read clearly point out that some ductile material become brittle when temperature drops below a certain point. However, if the temperature were to rise again and the metal had no cracking and survived, would...

33"W x 88"L x ~48"H (with drums in motion). It is a baseplate with tubular steel, sheet metal, motor, chain drive, gearbox, bearings, shafts, and chains for securing the drums. Mark

The unit is a drum end-over-end rotator (we call it a tumbler). It weighs 1050 lbs and can "tumble" 2 drums of up to 800 lbs each at 13 rpm. The bolt hole is 9/16". The manufacturer does not call out any bolt or anchorage. However, an engineer I spoke with said that bolting is intended to...

I am more concerned with if the machine moves, will the concrete or break away? Mark

I am looking for information on how thick of a concrete slab I need for 3/8" or 1/2" anchor bolts used to keep a machine from walking while in operation.

Can a flange clamp with injected sealant considered permanent repair for a leak? According to API 570 Section 8.1.4 Nonwelded Repairs, such repairs are temporary and must be replaced at turnarounds or appropriate opportunities. Is there any other standard or code that permits the use of such...

Ed and Pete, Here is what I did. I looked up the chapter on buckling and columns. The theory is that if the load is applied along the axis of a short column and not eccentrically, then buckling doesn't occur. Instead the critical unit load is equal to the yield strength. So can total up the...

I guess I can simply add up all the weight on top of the two supports and then divide by 2 and then divide by the cross-sectional area of the pipe to get the compression stress in the pipe. Then what would I compare that value too to see if it is too much? Are there compression strengths...

Thanks Ed, Weight is the biggest concern as the fluid in the pipe is water at around ambient temperature. The piping is only about 40" and has two 12" butterfly valves on either end, plus a large check valve. One end elbows down into the ground (then running underground). There is already an...

I have a 12" line that originally had a 19.5" long 8"-dia pipe welding on the bottom for a support. A new spool piece is fabbed for installation, but with a 6"-dia pipe for the support. The team has asked me to bless this. Although I do not think there is any problem, I would be only be...