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Bridgebuster: Designed by: G.T. Drawn by: E.W., A.S.B., S.K., E.C. Checked by: N.I., Y.C.C. Revisions: A.L.P.

gtaw, Thank you for the correction. That is what I get for not verifying info on drawings. This is probably why previous attempt to secure the grates by stick welding has failed! BTW, Interesting site. More to learn, thanks!

Guys, Thank you for the suggestions. I am considering welding straps or tabs and considering using a J-hook to secure the grates. I am looking into the procedures to weld carbon steel to A536 cast steel. The J-hook would snag the end of the drain pipe. I am a bit concerned about fatigue with...

Many thanks for the advice. I have almost 200 of these. I will be fighting this for a year. Best regards

Posting a drawing of the drain assembly. Thanks for the advice.https://res.cloudinary.com/engineering-com/image/upload/v1584123352/tips/Scupper_grate_ftb1dw.pdf

Gentlemen: I would like a welding procedure to weld a wrought iron grate to a cast steel scupper. The scupper is embedded in a concrete bridge deck. The bridge was built in the early 1970s. I do not have the grade of wrought iron of the specification of the cast steel. Many thanks!!

I agree with Racookpe. Moltenmetal has good points. I avoid threaded whenever possible. The last fitting on vents, drains, wash stations, etc. use threaded.

Artisi, I am interested in a several hundred RPM. I am teasing out some of the esoteric details by comparing the Meakhail-Park paper and the MIT papers.... tedious. Douglas

DubMac, thanks for the reply. Radial Vane Impellers are used in centrifugal pumps where the inlet is located at the centerline of the pump. The inlet of the peripheral pump is located at the periphery of the flow chamber on the opposite side of the stripper from the discharge port. TenPenny, I...

I could not find any threads on Eng-Tips for peripheral pumps. Regenerative pumps were mentioned in two threads. One only suggested that a regenerative pump may be a solution, the other, which I cannot locate this morning, indicated that almost no one who relpied was familiar with this type of...

I am trying to calculate theoretical pump curves for a regenerative pump. I am doing an feasibility analysis. This type of pump is also referred to as a peripheral pump. These pumps are used in residential water systems and for automotive fuel pumps. They are used for high head, low flow...

I agree that it may be time to rethink the use of ultra-strength bolts if you are in the bush. I used to buy grade 8 bolts from Caterpillar, pricey but they came individually boxed.... Seriously, machinery, automotive & farm equipment suppliers generally have a supply of quality fasteners.

Your header could be as simple as a Tee fitting. Your efforts should be concentrated on installing a larger pipeline as this will reduce your friction losses more than than improvements to your header.

1.25" diam x 0.4" long is a small manifold! A "Y" configuration will give you less pressure loss. Unless the velocities are large, above 10fps, I doubt that you will tell the difference. Are you blending two grades of gasoline?

If you can find "Analysis and Design of Flight Structures", possibly scanned by Google, I would expect that you can find out how to analyze the problem. I remember that they had good chapter on rivets & bolts. Most machine design texts will address this quite well... usually 2 diameters work...

Definitely read B31.3, ultimately the design of the pipe supports, anchors, etc. will be the result of stress analysis. You can always insert a larger schedule pipe if the analysis requires it. You may have to taper the transition by machining if the welds must be x-rayed as inspectors do not...

That is an almost impossible question to answer... It depends on the complexity of the piping, whether the piping is in a tank farm vs pipe racks running through a congested plant, etc. What about electrical, instrumentation & utilities? General arrangement drawings can be single line if the...

While spacers will not alter the bending stress in the shoulder bolt, they will keep the load centered. Without the spacers the load WILL shift to one side or the other. This is not the problem that is being analyzed. I would consider reaming the holes in the side plates if you are very...

Thanks for the help! Based on your advice I also checked wikihelp.autodesk and received the hint to add a balanced force. The simulation was very close to the calculations, Roark & Young. I will have a copy of the book that you suggested waiting for me when I return to the US. best regards, Douglas

I have checked the results of the attached file and it is correct for fixed-edge boundary conditions (slope of outer edge constrained to zero). I am familiar with Algor, Cosmos, and ancient FEA programs. AutoDesk seems to think that the "user's manual" is secret... Thanks, Douglas...