Gouging Nozzle - PGNM - Oxy / Propane  - One Piece Copper Design - Wear Tip
Sizes PGNM-10 #13P, PGNM-10 #19P & PGNM-10 #25P

Our propane gouging nozzles have been designed to be used in place of the AGNM where the user has switched from oxy / acetylene to oxy / propane. 
Note :- Oxy / acetylene gouging will always perform better than the oxy /propane due to the intense heat oxy / acetylene exhibits, however the AGNM #19 & #25 both require 2 large industrial DA cylinders so as to be able to achieve the full acetylene flow required to be able to burn with a stable heatng flame.
The oxy / propane version does not suffer from this same problem so does imply that the PGNM #19 & PGNM #25 would perform better than the AGNM if the AGNM nozzles were under- running due to a lack of acetylene flow from a single DA cylinder.

Each PGNM-10 gouging nozzle has a specific preheat size to suit the nozzle size, each has 10 pre-heat outlets around the gouging orifice.
 
As a procedure gouging is one of the most arduous oxy / fuel tasks which is why it is important  that the gouging nozzles are stable in use.  The gouging process by its very action implies that the nozzle is constantly being pushed close to or even into molten slag / dross before being blown away.  This is where the design of the Noz-Alls solid one piece copper gouging nozzle is superior to the two piece gouging nozzle as the one piece nozzle is less likely to have a backfire induced and sustained.

Therefore whether using the backward or forward gouging technique the Noz-Alls one piece oxy / propane gouging nozzle PGNM will provide the artisan with superior performance and easier gouging technique as the nozzle shape and size is the same as the frequently used AGNM.

To ensure the best stability our PGNM nozzle mix gouging nozzle has been  produced from a single piece of copper having 10 pre-heat outlets so as to be able to provide the fastest heat "punch" possible, all three sizes have 10 heating flames with heat output to match the nozzle size.
Noz-Alls PGNM having been manufactured from solid copper provides for a longer nozzle life alongwith the greatly improved stability enabling you to continue to keep gouging when 2 piece versions have expired with a burnt brass inner.
Our PGNM also has the wear skid to prevent the nozzle dragging and wearing away too quickly.

These nozzles are designed to be used in a similar fashion to the AGNM.
The PGNM is available in all 3 sizes:- PGNM  #13, PGNM #19 & PGNM #25.
 

Flame setting for the PGNM #25

1. Correct setting of the flame is important for performance plus to stop the nozzle overheating the flame retention skirt.
2. Oxy /acetylene burns much more quickly than oxy /propane, so setting the oxy / propane flame is slightly different. 
3. The pre-heat mix needs to be increased and adjusted several times this stops the flame blowing off the end of the nozzle as you increase the flame size / flow to achieve the correct working flame.
4. The oxy / propane pre-heat flame needs to be set so the flame is forcing this is when the inner flame cones finally move through to the transparent blue condition.
5. When setting the pre-heat the first few steps are to go from rich very yellow flame to the yellow blue then increase the propane flow - back to the yellowish flame - then more oxygen - back to the yellow blue flame - this is repeated several times so the flame size is increased but remains seated to the nozzle front face, when the flow is sufficiently high enough then the working flame is set.
6. The pre-heat cones move from yellowy blue to pale blue finally when properly forcing the pre-heat flame will be set with the correct  4 :: 1 oxygen to propane mixing ratio, at this point the inner flame cones  go to transparent blue condition / colour.  Each cone will be 12 to 15mm long.

Flame setting for the PGNM #19 & #13 is similar only the cones are smaller due to the smaller pre-heat outlet size.

           PGNM #13          Gouge width 6-8mm       gouge depth  3-9mm         
           PGNM #19          Gouge width 8-11mm    gouge depth  6-11mm         
           PGNM #25          Gouge width 9-12mm    gouge depth  9-12mm

Operating Pressures at the nozzle:-
 
PGNM #13       
Oxygen             4,0 – 4,5 bar gauge
Propane            0.25 – 0.5 bar gauge
 
PGNM #19       
Oxygen             5,0 – 5,5 bar gauge
Propane            0.35 – 0.6 bar gauge
 
PGNM #25       
Oxygen             6,0 – 6,5 bar gauge
Propane            0.5 – 0.8 bar gauge

Pressure at the nozzle will be affected by:-
Hose bore diameter -  only use 10mm bore hose as a minimum – hoses over 20m long use larger bore hose with a 5m x 10mm bore “whip end” so as to improve flow.
Hose length – hoses should always be as short as possible – as hose length increases so the pressure drop get greater. 
If necessary fit a test gauge to the torch inlets to verify the regulator pressure settings required to achieve the nozzle inlet pressures.
Hoses should be used which have correctly marked HCV identified with the standard either BS EN ISO 730-2 or BS EN ISO 5175-2 as well as the prescribed information.
(HCV which are not marked with the standard could adversely affect the flow of gas required).
 
Flashback arrestors – Regulator outlet mounted – due to their nature and the ability to quench a flame front all FBA will restrict flow and reduce pressure, therefore to minimise this higher flow oxygen FBA may be required. 
FBA must meet BS EN ISO 5175-1 or BS EN ISO 730-1