In the design of three-pass fire-tube hot water boilers by Packman Company, the three passes of flue gas start sequentially from the boiler furnace. They pass through the second furnace, return to the second-pass tubes, and are transferred to the third-pass tubes from the front door side. The exhaust gas is directed towards the boiler flue after passing through the third pass tubes, which are located at the end of the boiler.

Packman Company’s horizontal hot water boilers are produced as fire-tube and three-pass according to the BS-EN-12953 standard.

According to the standard, the furnaces of hot water boilers are manufactured with specified capacities using unique machines, in a corrugated form. In manufacturing the furnace in a corrugated form, skill in calculating and producing the depth and pitch of each corrugation is very important. Packman Company, with over 50 years of experience in producing steel boilers, has achieved this expertise.

Packman Company’s boilers are stress-relieved according to the specified capacities and thicknesses based on the aforementioned standard. The thickness of which is determined according to the boiler’s operating pressure.

The boiler tubes are made of ST35.8 seamless steel, which is exclusively imported by Packman Company from European countries.

Heat-resistant pipes are welded using special equipment with the method of fusion welding (for welding the network).

Boilers at Packman Company are welded using sub-arc and flux-cored welding machines from Isab Sweden, and with electrodes from Isab, Geka, and Ama. The welding of boilers is carried out under the strict supervision of Packman Company’s Quality Control (QC) team according to specified WPS (Welding Procedure Specifications). All necessary tests, including UT (Ultrasonic Testing) or RT (Radiographic Testing), are performed on the boiler welds.

It is worth mentioning that inspectors from the Standards Department are permanently present at Packman Company (as resident representatives of the Standards Department), and they review all necessary documents and tests. Upon delivery of boilers from Packman Company, standard plates will be provided, and if requested, documents such as WPS, PQR, etc., will be presented to the customer.