The following pre-galvanized requirements are checked visually before acceptance of goods.
Pre-preparation works are done for the items that should be cleaned for oil/paint and items that need provisions for hanging on frames.
Sandblasting is done to remove heavy corrosion, thick oil layers, or paint on goods.
Holes are made to have provisions for excess Zn draining and for trapped air removal.
Hooks are attached to the hanging of items on frames.
Surface cleaning and removal of scales using Hydrochloric acid is used as the pickle liquor.
After removing the scales from the articles, the remaining acid and iron particles should be removed by washing using the rinsing tank. This will prevent the introduction of Iron, acid, and other chemicals to the flux bath.
Double salt of Zinc ammonium chloride is used as the fluxing reagent to:
The following parameters are controlled in the flux bath.
The items are dried thoroughly to prevent explosion hazards during galvanizing and to prevent spatters on galvanized articles.
There is a double-chamber drying furnace to facilitate the drying of 02 frames simultaneously.
It operates with indirect heating by using the heat of the waste gases. Indirect heating helps to reduce natural resource depletion by reducing electricity consumption.
Galvanizing Bath is 7 m in length, 2.1 m in depth, and 1.3 m in width. Zinc used for galvanizing is LME-approved, 99.995% pure Special High-Grade Zn ingots. The following parameters are controlled during the process.
The ceramic bath is 3 m in length, 1.2 m in depth, and 0.8 m in width. This bath is used to galvanize small items followed by centrifugation.
Both the steel bath and the ceramic bath are manufactured by LOI Thermprocess of Germany.
Quenching is done by immersing in a freshwater tank to stop the Fe-Zn intermetallic reaction and to cool down the article quickly. Passivation is done to prevent wet storage stain.
Cleaning is done to remove ash, Zinc spikes, and other stains on the galvanized article. After cleaning, the thickness of the Zinc layer is measured and compared with the requirements specified in the BS 1461:2022 standard.
Spent pickle liquor is treated in the effluent treatment plant by using a filter press and disposed of in a 100% environmentally friendly manner.
Hot Dip Galvanizing processes meet the requirements of company standards and the BS EN ISO 1461:2009 international standard. Coating thickness of the galvanized steel exceeds the minimum requirements specified in tables 3 & 4 of the above standard.
| Articles and their thicknesses | Local coating thickness (min) µm | Local coating mass (min) g/m² | Mean coating thickness (min) µm | Mean coating thickness mass (min) g/m² |
|---|---|---|---|---|
| Steel > 6mm | 70 | 505 | 85 | 610 |
| Steel > 3mm to 6mm | 55 | 395 | 70 | 505 |
| Steel ≥ 1.5mm to 3mm | 45 | 325 | 55 | 395 |
| Steel < 1.5mm | 35 | 250 | 45 | 325 |
| Articles and their thicknesses | Local coating thickness (min) µm | Local coating mass (min) g/m² | Mean coating thickness (min) µm | Mean coating thickness mass (min) g/m² |
|---|---|---|---|---|
| Articles with threads: | ||||
| > 6mm diameters | 40 | 285 | 50 | 360 |
| ≤ 6mm diameters | 20 | 145 | 25 | 180 |
| Other articles (including casting): | ||||
| ≥ 3mm | 45 | 325 | 55 | 395 |
| < 3mm | 35 | 250 | 45 | 325 |
LTL Galvanizers has a strong technical collaboration agreement with the American Galvanizers Association (AGA) and LTL Galvanizers is also a member of AGA. The Integrated Management System of LTLGalvanizers is certified to ISO 9001:2015, ISO 14001:2015, and ISO 45001:2018 by internationally acclaimed certifying agency, Det Norske Veritas (DNV) Netherlands.
All fabricated and galvanized goods are inspected for quality compliance and packaged in accordance with the standards and specifications of the customer. To ensure the products arrive at their final destinations safely, they are loaded onto pallets with space left over to prevent moisture build-up. The pallets are then secured with PVC strapping. Packing lists are created and each package is numbered and recorded in a delivery document before shipping.