Answer / eid

1.Cold permit.
2.Hot permit.
3.Confined space permit

Answer / md ehtesham uddin

there are three types of permits
1. cold work permit
2.hot work permit
3.general work permit.

Answer / faruk nazmi

Hot Work, Cold Work, Confined Space

Answer / dharmaraj.s

PTW is Permit To Work.
3 types are:
a.Hot work permit(related to welding,grinding like wise)
b.Cold work permit(related to like dismantling,tightening)
c.IEA permit(Instrument Electrical and Analyzer works)

Answer / ayaz

PTW stand for PERMIT TO WORK 
 1-cold permit
 2- spark/hot permit
 3- vehicle entry permit

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