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We use a inhibited hydrochloric acid to remove lime scale deposits in our lime slurry system. Once in awhile operators have used sulfamic/sulphamic acid in the system as well. I'm trying to figure two things. Something is gassing off to discolor surrounding stainless and also it corrodes the...

Does anyone have any reference material for pumping of lime slurries. Things like: 1) Line velocities (I've read around 4 to 7ft/s.) 2) Densities for pumping 3) Properties of lime slurries at various densities (viscosity etc) Does anyone have any actual testing performed that can be...

The mill I'm at has a gravity sewer system which flows through 1200mm pipe and through various distribution boxes. Flow rate of 900 to 1100 l/s. Flow rates during maintenance days are around 50 to 300 l/s. Temp is 50 to 60 deg C To avoid costly bypassing is there a way to clean the...

We have a pipeline and diffuser for our effluent and the cover has been washed away. The divers are recommending a method that I see as being very costly. Anyone tried to replace cover on a pipeline or diffuser n a river? How did you do it - and did it work/last?

Is there a method of sending a probe down a pipeline (underground) to measure wall thickness?

I plan to remodel my house next year and I would like to do the calculations myself. Basically I want to knock out a load bearing wall (Larger than the typical opening) and raise the roof on an addition so that I have one continuous room. (kitchen / Dining / Entertaining) Since I'm only a...

I need to make a branch connection on a 6300 Kpa line. 18" main with a 0.937" wall and the branch will be 2". I know regular cutting devices can keep the coupon but what about the filings/ribbons. How do you stop them from entering the pipe. This is on a main line to a turbine in a vertical...

Does anyone know a good source on how to design a dunnage system of wood blocks to hold 13 tons. I need to support a fan rotor and I want to block it up but I'm lacking on Dunnage information... know a good book on design, material etc.

Anyone use a good Change Management software for approving and tracking changes to equipment, materials and processes at an industrial site, to make sure the right approvals are looked after regarding quality, regulatory, costing, safety etc. Some names woul be appreciated so I can look them up...

Does anyone know who regulates the rate of odourant injection into gas lines? Canada in particular / Alberta

What are the disadvantages of fluid couplings or things I should look out for? I'll be using it on a eccentric system which shakes. (Like a vibratory screen) but it only runs for a second or two every few minutes. It'll be in a hot environment as well... 40C or so.

I'm trying to replace an HH Bolt A325 with a stainless equivalent. What about the nut? Would that be a a grade 8.8 or 10.2?

It's sad to see three proj. engineers trying to do a structural calculation to check something. I need a quick refresher. When a beam runs perpindicular to two concrete walls and is bolted to them, is it considered simply supported or cantilevered? I thought originally simply supported but...

We have a reactor clarifier and we need to take it out of service for some major maintenance (couple weeks). The problem is we need to keep running. So we have a dilemna. Do it in summer and have lots of dirt but softer water or do it in winter and have clean water but hard. I don't like...

My employer would like me to try and calculate out if a new floor mount jib crane would overload the floor. I'm a junior engineer and haven't done more than simple beam calculations. Here's my problem: I'm assuming / deriving loads from various equipment in the area and simplifying as many...

Does anyone know what SPMDD stands for in reference to compaction?

What the heck is SPMDD in reference to ground compaction?

I just had a vendor give me an overview of oil misting systems that replace oil lube in pumps etc. He painted a very rosy picture but I'm wondering about the disadvantages. I'm talking about a closed system where the oil mist is returned back so it doesn't coat everything in a film.

I started this thread in the wrong place and I think they deleted it. I have been out of school for several years and I work at a great company. I've been doing project management for the most part. I'm in charge of most small and large projects in my area. I look at varous designs, compare...

My health and safety department wants me to design a live fire traning prop for a leaking flange fire. I'm wondering what codes to follow - most of the time I don't try and light fires I try and prevent them. By intuition I'm guessing that I'll need some backflow fire prevention on the fuel...