SUBJECT OF PRESENTATION Product Knowledge (Sub-Contract, Ready Stock) Application System How to Replace Existing Supplier (Technical & Non-Technical Aspect) Cleaning Process All about chemical cleaning & other business (Marketing Assessment) How to get Customer : Information Presentation Closing (PO/MOU) Survey Handling Invoice
BUSINESS PLAN Chemical Cleaning Boiler Treatment Cooling Treatment Media Filter (Carbon Filter & Ion Exchange) Seawage / Waste Water Treatment (Bacteriagard / Biopower Nutrition for Bacterial) Maintenance Filter & Exchanger (Strainer Local & Import)
SCALE / DEPOSIT REDUCE THE HEAT EXCHANGE CONTINOUS CORROSION METAL WASTES PIPING/EQUIPMENT FAILURE
CLEANING SYSTEM What chemical / scale removal will be apply ? Concentration ? Temperature ? Bath or Circulation ? Time ? Circulation Flow Rate ? Dangerous for Installation/Material of Construction, People, Environment ? Need Mechanical / Manual Cleaning for Pre-Cleaning and Post-Cleaning ?
CIRCULATING SYSTEMSampling inlet Sampling outlet system system EQUIPMENT / SYSTEM Residence Time in Equipment/System = 30 minutes (pump capacities) FILTER MEDIA Residence Time in Circulation Tank = 2 - 3 minutes (Holding Volume of Circulation Tank) Blowdown CIRCULATION TANK Blowdown
ACID CLEANING AGENTS HCl (Hydrochloric Acid) Effective/Economically dosage = 5 – 10% Cleaning Temperature = 150 – 160oF(75 – 80oC) Static Soaking for few hours (for ex : 4 hours) Temporary circulation for mix the chemical for 10 minutes every hour (HCl is quite corrosive) Sometimes need Nitrogen Bubbling from lower header as one of mixing chemicals.
ADVANTAGES OF HCl Effective for carbonate-scale, especially in Boiler Aggressive solvent to deposits It is a good solvent for iron-oxide layered with copper It is the best solvent , containing 0,25% - 1% of Ammonium bi-Fluoride (NH4F-HF, ABF) to remove siliceous scale/deposits. ABF is converted to HF (Hydrofluoric Acid), which is one of the aggressive chemicals toward silicates Inexpensive
DISADVANTAGES OF HCl Very corrosive (Hazardous Material) Chemically inhibitor added to minimize corrosion potential to the base metal (film amine) (For example : Promex (0,1 – 0,3%) for 10% active material = 100 – 300 ppm Safety concern
ACID CLEANING AGENTS PHOSPHORIC ACID Mainly used as rust removal on carbon steel surface and sold under other names, such as “rust killer” or “rust remover” To convert Iron(III)-Oxide (rust) to a water soluble phosphate compound After treatment, the reddish-brown iron oxide will be converted to a black iron phosphate compound that may be scrubbed off.
ACID CLEANING AGENTS SULFAMIC ACID The main use is as a cleaning agent in substitution for hydrochloric acid, in the marine Industry, due to its safe storage characteristics. Use on stainless steel or copper alloyed surface (HE Equipment). Effective dosage = 1% (at pH = 2) Chemical cleaning process maintain at pH = 2, the cleaning process is finished if pH stable at 2 for 3 – 8 hours. Need dispersant / detergent no foam to bind the deposits.
ACID CLEANING AGENTS NITRIC ACID Mainly used for the pickling and passivation of stainless steel surfaces. Effective dosage = 5 – 10% Strong Oxydator
CHELATING AGENTS EDTA Mainly used as chemical cleaning boiler as chelating agents. Most popular is tetra ammonium EDTA Ammonia is alkaline, and a typical EDTA cleaning is performed at a pH of 9 to 9.5. The chemical Is much less corrosive than HCl and the process is performed at an alkaline pH, so if a bit of residual remains in the Boiler after the cleaning and rinses. It will not attack tubes like HCl will. The chemical itself is not as Hazardous as HCl, although an ammonia smell will be evident. Among its disadvantages are that the boiler must be fired (T > 100oC)
CHELATING AGENTS EDTA Another choice is the diammonium EDTA the pH of the solvent is adjusted to a range of 5 to 6. This solvent is more reactive than tetra ammonium EDTA Only needs to be heated to about 200°F (100oC) to be effective. However, the lower heating rate reduces the ability of the Chemical to circulate in the boiler.
CHELATING AGENTS CITRIC ACID similar to EDTA, it is a chelant and will bind both iron and copper ions. Two citric-based solvents are mono-ammonium and di- ammonium. Mono-ammonium, the solvent pH is around 3.5 to 4, and the optimum temperature range is 180°F–200°F (90–100oC)
CHELATING AGENTS CITRIC ACID Diammmonium Citric acid solutions have a higher pH of about 5 to 6, and this solvent is somewhat less aggressive toward deposits, so a higher temperature (240°F–275°F) is required for it to perform efficiently. Citric acid is not as strong a chelant as EDTA, and thus is not as popular for post-operational cleanings, although it can be doped with ABF to remove silica deposits. It is sometimes preferred for pre-operational cleanings, where iron oxides constitute the bulk of deposits, and where an aggressive acid Like HCl is not needed..