Recently TDI has made some changes to the standards which are causing me some issues when teaching CCR classes:
First they state a maximum of PO2 1.4 is to be used in all diving applications. This prevents me from using pure O2 at 20ft for bailout deco and also prevents me from performing an O2 flush at 20 ft to verify cell function.
The required breathing rate (SAC) for bailout is way too conservative at 1CFM if we are to use rule of thirds on top of that. Almost all instructors I know use a set of conservative factors based on regional and environmental considerations. No need to add anything to that.
The END factor of 100ft (PPN2 3.16) is also way too conservative. My dive planning for CCR has always involved using 1.6 PO2 limit for bailout deco gas and 4.0 PN2 for diluent and bottom bailout. Heliair for diluent and a 32% nitrox blended with helium for bottom bailout fit these limits quite nicely.
The limits imposed by the new standards are just too restrictive. How about letting your instructors do what we are trained to do without imposing unrealistic limitations?
First they state a maximum of PO2 1.4 is to be used in all diving applications. This prevents me from using pure O2 at 20ft for bailout deco and also prevents me from performing an O2 flush at 20 ft to verify cell function.
The required breathing rate (SAC) for bailout is way too conservative at 1CFM if we are to use rule of thirds on top of that. Almost all instructors I know use a set of conservative factors based on regional and environmental considerations. No need to add anything to that.
The END factor of 100ft (PPN2 3.16) is also way too conservative. My dive planning for CCR has always involved using 1.6 PO2 limit for bailout deco gas and 4.0 PN2 for diluent and bottom bailout. Heliair for diluent and a 32% nitrox blended with helium for bottom bailout fit these limits quite nicely.
The limits imposed by the new standards are just too restrictive. How about letting your instructors do what we are trained to do without imposing unrealistic limitations?