Boiler Treatment

Item 1 is caused by inadequate blowdown frequency, plus inadequate washout regimes combined with inadequate upstream water treatment processes.

Item 2 could be anything. After all, it was common practice on locomotive boilers to hurl a bucket of dry sand into the firebox while the engine was working hard to clean the deposits off the inside of the fire tubes. Without knowing anything about the boiler in question, it is difficult to say more.

I agree on the sludge. More effort required in blowing down and water conditioning.

Number 2 needs more information. What kind of boiler is it, what sort of fuel are you using and what sort of lagging and brickwork is in there?

BAB

Thanks for the comment. The boiler is a Robby lincoln brand operates on diesel fuel. It is a single pass horizontal tube boiler.

Kingsley

Sorry for coming in a bit late here. Agree with the answers given earlier regarding the inadequate BD and Water conditioning.

Just a note : Please check what is the type of Internal Water Treatment being used - there are 2 types of Boiler water treatment - Depositing the Sludge down, where it requires a regular BD from the Bottom Header / Mud Drum at HP before the boiler is put on range. The other type keeps the sludge in suspension ( called the Solubilizing type) where you need a regular BD from the Top Drum in line with TDS control. So if you are using the second type, then it may mean that perhaps you need to recheck the calculation of boiler chemical added based on your cycles of Concentration.

The other reason has been already given - Water Conditioning. Here, if you are using Untreated Water, I would check the External Water treatment and see whether I am having carryover of SS ( suspended solids). Normally the allowance given is max 2.0 NTU after the External Clarification process. If there is carryover, the External Treatment ( interms of chemicals dozed - Alum, Soda, Polyelectrolyte ) need to be verified and whether the Water Clarifier is functioning well.