dipil Started The Discussion:
As per Indian Standard IS:2925-198, following tests are mandatory for Safety Helmet
1. Clearance above the head
2. Shock Absorption Resistance
3. Penetration Resistance
4. Flammability Resistance
5. Water Absorption
6. Heat Resistance
8. Resistance to corrosion of Metal Parts
Can anyone give me further more details regarding each test...
1. How it is conducting...
2. What should be the result of each test...
3. Is there anything more than these tests mentioned in IS 2925...
4. Can anyone tell me the STANDARD FOR LOAD CARRYING HELMET...
5. Can anyone provide details of Helmets made up of Fibre Glass... Any suppliers details who can supply the same also please...
Please give me the detials... This will be of very much helpfull to me... If you have not having IS standrad, please give me the above mentioned details based on any other standards...
Looking really for help... I am in need of it now... Hope to get some help soon...
Dipil Kumar V
How many safety people are their in this forum, not many I presume.
ISI print and publish all the standards. Safety department is supposed to have all those standards pertaining to safety and avoid procurring sub-standard equipment and force workers to have a false sense of protection. You may check with any technical library or write to ISI to obtain the list and raise a purchase request immediately. No management will reject your request.
Now Quality control on Helment. I am giving you the tests done by ANSI. IS mostly follow the same.
A sample of hard hats from each batch or production shift is set aside for testing according to the ANSI criteria. Some samples are cooled to 0°F (-18°C) for a two-hour period prior to testing, and others are heated to 120°F (49°C) for two hours before testing. The Type I impact test involves dropping an 8-lb (3.6 kg) steel ball from a height of 5 ft (1.5 m) on the top of the hat as it sits on a head form; no more than 1,000 lb (4,400 N) of peak force can be transmitted to the head form, and no more than 850 lb (4,000 N) of average force can be transmitted. The Type I penetration test involves dropping a 2.2-lb (1-kg) pointed steel penetrator with a 60 angle on the top of the hat from a distance of 8 ft (2.4 m); it must not make contact with the head form. In addition, Type II impact and penetration tests involve dropping helmeted head forms onto steel anvils and pointed steel penetrators.
Under earlier ANSI standards, electrical conductivity was tested by measuring current in bodies of water inside and outside the hat. Since 1997, the test has been performed using metal foil on opposite surfaces. The conductivity test is performed on a sample that has already withstood the impact test. The most rigorous criterion (for the highest class designation) requires the hat to with-stand 20,000 volts for three minutes with no more than nine milliamps of current leakage, followed by exposure to 30,000 volts with no burn-through permitted. For the flammability test, a hard hat is positioned on a head form and exposed to a 1,550°F (843°C) flame for five seconds. There must be no visible flame on the helmet five seconds after removal of the test flame.
Respond if it is useful only pl
Frankly saying I was having ANSI standard already... However was confused whether I can compare it with IS... As from your reply I came to know that mostly IS follows these tests, it is helpfull to me...
Surely will try to track Indian Standards...
Thanks a lot for your quick response... Expecting the same help in future too...
Dipil Kumar V
Safety helmet should withstand the impact of a plumb ball of 500gm weight with conical steel point having an included angle of 36 degree or a spherical point of radius not more than 0.5mm, dropped from a height of 3 meter with pointed end downward onto the top of the crown of the helmet without getting pierced, dented or suffering failure of any integral part.
This is as per IS 2925:1984
Tests Carried On ‘‘HELMET’’:
Climate Condition Test
The specifications IS 2925:1984 interrelates these three conditions as follows:-
i) Very Hot climate : A temperature of 50 ± 5º C for 4 hours in an oven.
ii) Very Cold climate : A temperature of –10 ± 2º C for 4 hours in a refrigerator.
iii) Heavy Rinfall : Water flowing all over the surface at 1 ltr/mm for 4 hours
Shock Absorption Test
A rectangular block having a horizontal striking surface of 180mm x 180mm weighing 3 kgs. is allowed to fall freely over the helmet from a height of 1.5 ± 5mtr. It is ensured that the force transmitted is not greater than 5KN i.e. 510 kgf.
Flame Resistance Test
IS 2925:1984 have framed certain specification for flame resistance. A blue flame is generated by a burner with temperature same as that of melting point of copper. This flame is exposed to the surface of the helmet at 45º angle for a period of 10 seconds and then the helmet is removed. It is ensured that the helmet does not catch fire within 5 seconds of removal of the flame.
Electrical Insulation Test
As per IS 2925:1984 standards an inverted helmet is placed into a container containing a solution chloride in water (6 gms/ltr.). The same solution is filled in the inside of the helmet as well. The helmet is allowed to stand for a period of 18-24 hours at room temperature. An A/C voltage of 2000 V is generated between two electrodes, and an ammeter connected in series. It is to be ensured that no current flows and there is no deflection in the ammeter.
Water Absorption Resistance Test
As per IS 2925:1984, a helmet immersed in water at a temperature of 25º C & 35º C for 24 hours should not gain mass of more than 5%.
Heat Resistance Test
IS 2925:1984 ensures a baseline conformity to heat resistance. The shell is placed in an oven for 15 minutes maintained at a constant temperature of 93 ± 5º C. Upon removal from the oven, the shell should not separate, distort or soften.
As per my knowledge, there is no such STANDARD for Load Carrying Helmets as of now.
As for the supply of FRP helmets, you can contact Mr. Keerti Raj Singh
Mob : 9300363500 a renowned supplier to L&T and various others in Raipur.
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