• Range
• Technical
• Quality Control and Testing

1. Range

Specifications Types	Weldable Type	Flanged Type	Swan Neck Type	Goose Neck Type
Fin Length (mm)	700-1200	700-4500	700-4500	700-4500
Width (mm)	300/380/520	300/380/520	300/380/520	300/380/520
Pitch (mm)	40 & above	40 & above	40 & above	40 & above
Pipe Diameter (NB)	80/100	80/100	80/100	80/100

Also Customized Radiators can be manufactured as per customer Specifications

FIN FORMING PROCESS :

Panel at Gururaj Radiators are made on Fully Automatic Panel forming machine. This helps us to maintain uniformity and zero water pocket. The welding process is designed to ensure no water pockets develop on the panel which in turn ensure longer life and corrosion protection of the radiator.

GRPL can produce 520/380/300 mm wide radiator panels using cold rolled carbon steel (CRCA) thickness ranging from 1.0mm to 1.6mm thick.

RADIATOR FABRICATION PROCESS:
At Gururaj the radiator manufacturing is designed to ensure that no foreign particle can enter the inside of radiators during manufacturing. The fabrication process incorporates superior welding technology to ensure that no water pockets are developed during the fabrication process. The radiators are assembled in very precise gauge to ensure dimensional accuracy well designed manufacturing process & strict process control the fabrication time from start to finish for and average lot of radiators is about 15hours.
Gururaj can fabricate radiators with center to center distance ranging from700mm to 4500mm. All the elements are held in position with bracing straps. Gururaj can provide 8mm or 10mm Dia bright rod or 25mm x 6mm mild steel flat for the purpose of bracing as per DIN 42559. Every radiator manufacturing by Gururaj has a unique no punched on the radiator. This number helps in maintaining the quality records of the job .With this unique number the entire history of the radiators can be derived from the workers name who have worked on the radiators or the time at which different inspection were carried out with inspector name or the time interval between two coats of paint with total raw material traceability.

ASSEMBLY & WELDING PROCESS:
At GRPL the radiator manufacturing is designed to ensure that no foreign particle can enter the inside of radiators during manufacturing. The fabrication process incorporates superior welding technology to ensure that no water pockets are developed during the fabrication process. The radiators are assembled in very precise gauge to ensure dimensional accuracy well designed manufacturing process & strict process control the fabrication time from start to finish for and average lot of radiators is about 15hours.
GRPL can fabricate radiators with center to center distance ranging from700mm to 4500mm. All the elements are held in position with bracing straps. GRPL can provide 8mm or 10mm diameter bright rod or 25mm x 6mm mild steel flat for the purpose of bracing as per DIN 42559. Every radiator manufacturing by GRPL has a unique no punched on the radiator. This number helps in maintaining the quality records of the job .With this unique number the entire history of the radiators can be derived from the workers name who have worked on the radiators or the time at which different inspection were carried out with inspector name or the time interval between two coats of paint with total raw material traceability.

SHOT BLASTING PROCESS:
The radiators at GRPL are grit blasted in an environment friendly blasting both incorporating all safety measures. The blasting process is designed to give SA 2 ½ finish as per ISO 8501 SSPC-SP-10 standards.
The shot blasting chamber is incorporated with cyclone dust collector for clean working environment.

EXTERNAL COATING PROCESS :
Once the radiators are blasted they are cleaned with air and are loaded on a conveyor. The conveyor and the paint shop are designed in such a way that the paint film of the radiators remains intake and there is no damage to the paint film due to handling. GRPL can provide various types of paint system. All the systems are applied by flow coating technology which ensures that the paint reaches the in accessible areas.
GRPL can offer the following paint system as per customer requirement.
Radiators externally coated with synthetic enamel paint as per IS2932, final paint shade as per client specification up to maximum number of 120 microns.
Radiators externally coated with Epoxy paint, MIO & final paint shades as per client specification up to maximum of 300 microns.
Radiators external coated with Zinc Rich primer + Epoxy MIO + Polyurethane paint, final paint shade as per client specifications up to maximum of 300 microns.
Spray galvanized Radiators and coated with any of the above mentioned paint system up to maximum of 300 microns.
All the above systems are designed to withstand different condition as per ISO 12944 Global Corrosion standard.

INTERNAL COATING PROCESS :
The radiators are cleaned by air purging MPO flushing and all contamination in the radiators is magnetically removed. The radiators are then coated internally with a phenolic resin based hot oil resistant varnish with a temperature index of 120°C or any paint as per customer specifications.

PACKING:
GRPL radiators packed in wooden case, sea worthy packing. GRPL manufactures all the cases in the house and pays special attentions the packaging and accessories used for packing.

Gururaj has well established quality system accredited by ISO 9001 2008 stringent incoming material and in process quality plan. With the help of quality tools the rejection and network level are continuously checked and controlled.
GRPL quality plan for manufacturing radiators incorporates routine and type test to be carried out on the radiators. The Routine inspection carried out by GRPL

PANEL TESTING :
In order to maintain the quality of the panel formed, inline inspection of panel is done on sampling basis. Panels are checked for center distance, flute depth, diagonals and leakage. A dedicated setup is used to inspect the panel for leakage.

ASSEMBLY TESTING :
In order to fabricate the job as per customer specification, each and every job is checked by the quality team. Stage wise inspection is done to avoid any type of deviation.

PRESSURE TESTING :
All radiators are pressure tested at 2.0kg/cm2 individually under water for period of half hour .This is done to ensure efficient performance of radiator at the site without any leakages.

COATING TEST :
After painting the paint thickness is measured on all radiuses using SPC technique to guarantee minimum thickness all over the radiator. Paint peel-off test as per ASTM 33 59 83 is performed on randomly selected radiators.

TYPE TEST OF RADIATORS :
The radiators are grit blasted in an environment friendly blasting both incorporating all safety measures. The blasting process is designed to give Sa 21/2 finish as per ISO 8501 SSPC-SP-10 standards.
Radiators are type tested for leakage against hot transformer oil at 105°C at 1kg/cm2 for a period of 12hours.
The radiators are type tested to withstand vacuum of 0.5mm Hg absolute for one hour and permanent deflection measured at center should not exceed 0.5 mm.