I have just seen a proposed heat exchanger with Titanium ( Grade 2) tubes and Alloy 400 tubesheets. The heat exchanger cools saturated brine. The galvanic action between these metals is much the same as between Stainless steel and Mild steel. Would it be reasonable to expect the titanium...
We are struggling to find the best material for some solid tyres which carry the outer end of a beam which rotates over a large water treatment tank Speed is very slow and the tyre runs on a smoothe concrete surface.
- Our steel wheels are 20" diameter with a flat rim 5" wide and the tyre is...
I have been asked to line a second hand GRP tank so it can store this chemical at 20 Deg C. I have never heard of CAPB previously and the Client has been told that a new tank would need to be Hasteloy or an equally exotic Stainless steel.
All I can discover about CAPB is that it is coconut oil...
Our London appartment block has four large rectangular galvanised tanks on the roof inside the Tank Room.They were put there 40 years ago and the roof built over them. I believe that galvanising has a limited life and soon we will be faced with huge expense to renew them . Would it be...
Hello, We have a heavy transformer enclosed in a mild steel case that has a cooling water jacket fed with fresh clean water. The unit is old and possibly has internal corrosion that might build up and block the narrow water passages.
Experimentally we acid flushed the jacket with Phosphoric acd...
Hello All. We have a vertical discharge waste water pipe 24 inch dia and 200 feet drop (Ten lengths of 20 feet each.) To slow down the flow each length is packed with bundles of 4 inch dia plastic pipes,each bundle is built from 14 pipes 3 feet long. Each bundle is out of line with the next...
Hello, My domestic garage ( 35 years old) is built into a sloping ground and the rear wall now showing a few cracks due to external ground pressure. I'm thinking of strengthening the wall by drilling through the wall and then driving in a number of "soil nails" made from sizeable rebar, driven...
I'm trying to estimate cost of some repairs on a 100 yr old steel bridge and need to remove a couple of hundred rivets ( 3/4 inch size and very corroded) but we must reuse the holes for galvanised bolts. The old rivets can be removed by drilling them out, or by carefull use of a blow...
During the production process red hot coke is instantaneously cooled by quenching with water (200 tons in 10 minutes) The water recirculates - - - it achieves a steady 70 degree cent and is held in an unlined steel tank which has lost 8 mm thickness in 8 years. Please has anyone any expeience...
In an emergency situation we had to modify some 2" cpvc pipework but using pvc instead (due to material availability.) The duty is ambient temp Chlorine Dioxide at 5 bar pressure. As best we can deduce from corrosion charts pvc is inferior to cpvc, but maily at elevated temps. At ambient...
My Client plans to store 96% H2SO4 in a 2000 ltre polyethylene tank and the several stub branches are from 32 mm pipes, of pe100 material.
However, I have seen a corrosion chart from a supplier which says Polyethylene is Unsuitable for this concentrated acid, However I've also seen other data...
We refurbish a 5 foot dia fan every 18 months - - Its what we call a paddle fan - -6 blades that are like the paddle on a paddle ship - -the blades are 3/8 thick and they push a heavily loaded mineral dust up the exit stack. - - the tips of the blades are always greatly bentbut we know there is...
I run a "Shot Blast and Paint" workshop and at short notice I am trying to decide if it is possible to totally remove paint from 2000 sq mtrs (actual surface area) from cast iron railings on a Victorian Bridge.The rails would be dismantled and moved to our spacious workshop for paint removal...
Small wheels are "crowned" to a radius which keeps the belt central. Wide conveyor belt drums can also be crowned but the same effect is also achieved by machining so the central 33% is parallel with the outer regions tapered to have a trapezoidal profile.
I believe it will not work if...
As an alternative to Rubber lining we are considering a vinyl ester resin GRP lining for an 85 Deg C big steel tank. We have successfully used such coatings at ambient conditions. We have also had good results with small patches at this higher temperatures but I've now got some reservations...
We propose to repair some arms from old cast iron signposts and are amazed at the cost of weld electrodes for C I work. Roughly six time more than I expected, at £3.50 per rod of 3.25 mm size Please can anyone suggest why they cost so much.
Thanks in advance
Corrosion man
I am urgently searching (without success) for the Manufacturer of an Inhibitor which is put into the gas pipes - - I believe it goes in at the rate of one pint per million cubic feet of gas - - The product reference number EC 1391-A
Please does anyone know of this product or of anything...
Gentlemen, Cooling tower fans have 4 blades, typically 60 inches long 15 inches wide and of a fixed section for the full lenght without any change to the "angle" of the blade. Such a blade must be extreemly inefficient as a rotating "wing". Please can anyone hazard a guess as to the...
Does thick aluminium plate have any " locked in stresses"
From a disc 30" dia and 5" thick we wish to make a saucer to very precise curvature. If we machine the concave face first to exact curvature will there be any changes when we remove a lot of metal from the other face? Its only...
I want to machine from a solid brass casting the five platonic shapes. The first three are easy but please can anyone out there offer any guidance on how to start with a 3 inch solid ball and make a icosahedron then a dodecahydron.
Any comments much appreciated.
David Whitlock.
