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The nature of the process and chemicals involved will not allow any organics to be used. Mg(OH)2 would not cause a contamination problem and that is why I am interested in it but I can seem to source a comercial formulation designed for this use.

I have seen a few references to Milk of magnesia, magnesium hydroxide, being used as an antigalling / antisieze for stainless on stainless threads. Does anyone have any further information on this or know where I can find a commercial formulation of milk of magnesia for this purpose?

Thanks for the input. We tried UHP water 30K psi. It took x3 passes to give a reasonable clean using the Stoneage Gopher nozzle but we didn't have the time to do that on all the tubes. We have removed about 50% of the scale at best and so it looks like it is going to be a chemical clean. Are...

A bit of further information. The bundle consists of 900 tubes each 1.5" id, 13' long. It is a vertical falling film condenser type unit but the evaporation is done in a single pass. The fluid is a melted salt that we add a metal salt to to change its properties. The metal salt contains the...

We have a heat exchanger that is getting fouled by a silica / iron deposit. It is 10% Fe and 70% Silica and deposits on the tubes as a brown sludge. The operating temperature is 180°C and ambient pressure on the proces side 13 bar.g steam on the heating side. We have used water jetting to...

I have a small project that involves the installation of a tank and pump the tank is 304 st/st 2m dia by 6m tall will hold 18.5m³ of water full, and the pump weight is 90kg. The foundation is for nothing else. The project eng I have insists on having a piling foundation with a concrete slab, 3m...

I am looking at the combustion in a reformer. I suspect that the excess air into the convective section is far too high as the excess oxygen in the stack is 5%. We also have high NOx which would seem to confirm this. I have been looking for a plot of excess air vs NOx concentration in the stack...

The NSAA (National Sulphuric Acid Association) provide some basic guidence on storage of conc H2S04. From a level point of view you can calibrate the instrumant as you like but froman operational point of view they do have suggested maximum operating levels below the overflow and vent lines. If...

FYI, We used Ti tube, fully welded with pulled bends and the spec changed to U-PVC either end, at valves, drain points and pressure relief. Although the fittings are expensive where the spec changes overall it was the cheapest option. PeteRJ

Alex18, I have not experience of your products but I must agree with saxon that care should be taken when setting up a steam tracing system. I have seen several tracing systems that develop leaks and because of poor set up they are very difficult to rectify. Consider how the tracing will be...

mucour, I'm not sure I understand your question fully but we use a guide word based system to determine which case to use for relief valve sizing.We would work down the list and perform the appropriate calculation where there is a reasonable probability that the situation could arise. The case...

Thanks for the input. Do you have any contact for Titanium tubing, 1/4" and 1/2" to supply in the UK? Regards, Pete.

I am in the process of designing a pipe run for sodium hypochlorite, 14/15%, ambient temp, up to 6bar.g., about 150m long. I am considering 1" PTFE lined carbon steel or small bore 1/4" hastalloy-c276. Does anyone have any advice for the most ecomical material for a hypo line or...

I worked on a glycerine distillation plant for a time. To memory the freezing point of pure glycerine is about -10°C and the melting point somewhere around +18°C. It was of some concern that unlagged lines would freeze in winter and it would be a problem to melt the lines again. In test the...