PVL Underwater Cutting Torch User manual

PVL INTERTANIONAL B.V.
User Manual
PVL Cutting Torch
Revision 2020
Copyright © 2020 PVL International B.V.
PVL International B.V.
Weijererf 31,5541SZ
The Netherlands
Telephone: [phone]
E-mail: [email protected]

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TABLE OF CONTENTS
APPLIED WARNING SIGNS....................................................................................................................... 3
Chapter 1 The PVL Cutting Torch kit ....................................................................................................... 4
1.1 Introduction................................................................................................................................... 4
1.2 Gas and Oxygen............................................................................................................................. 5
1.3 Preparation.................................................................................................................................... 6
Chapter 2 The operation ......................................................................................................................... 7
2.1 Connecting the PVL cutting torch.................................................................................................. 7
2.2 Connection instructions ................................................................................................................ 8
2.2 The Cutting .................................................................................................................................... 9
2.2.1 Start cutting............................................................................................................................ 9
Chapter 3 User maintenance................................................................................................................. 11
3.1 Cutting head ................................................................................................................................ 11
3.2 Cutting Oxygen valve................................................................................................................... 11
3.3 Gas/Oxygen valve........................................................................................................................ 12
3.3.1 Valve leakage ....................................................................................................................... 12
3.3.2 Replacing O-rings and seats ................................................................................................. 12
Chapter 4 Guarantee............................................................................................................................. 13
Chapter 5 Ordering numbers ................................................................................................................ 14
Attachment 1 Parts drawing.................................................................................................................. 15
Attachment 2 Parts drawing.................................................................................................................. 16

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APPLIED WARNING SIGNS
WARNING
ATTENTION
DANGER
This is an indication for a very dangerous situation that can cause severe
injury or death.
This is an indication for a dangerous situation that can cause injury or severe
damage to the equipment.
This is an indication for a situation that can cause damage to the equipment.

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Chapter 1 The PVL Cutting Torch kit
1.1 Introduction
The cutting torch is designed exclusively for use underwater.
It differs from other underwater cutting torches by:
•Low costs per meter compared to thermal cutting devices (no expensive
electrodes work faster because no electrodes need to be exchanged).
•Less sensitive for contaminated cutting surfaces.
•Spare parts can be supplied from stock.
The PVL torch uses Oxygen and Gas as a cutting medium (See table on page5). It has a
three-hose system, which uses one hose for the Gas, one for the Oxygen and one for the
cutting Oxygen.
The inner diameter of the hoses is 9 mm.
The PVL torch is available with a cutting head under 55° and 90° and is supplied together
with the maintenance tools in a solid case.
DANGER
For safe use of the cutting torch, experience with a surface cutting torch is
required. It is also presumed that the user of the torch is an experienced
diver.

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1.2 Gas and Oxygen
It is not possible to adjust the cutting flame under water. The flame is adjusted by adjusting
the pressure reducers above the water.
Table pressure / Diving depth
Depth
(msw)
Gas pressure
(bar)
Oxygen pressure
(bar)
Cutting oxygen pressure
(bar)
0
1
4
6,5
5
1,5
4,5
7
10
2
5
7,5
15
2,5
5,5
8
20
3
6
8,5
25
3,5
6,5
9
30
4
7
9,5
35
4,5
7,5
10
40
5
8
10,5
45
5,5
8,5
11
50
6
9
11,5
The pressures for the cutting Oxygen as indicated in the table apply up to 25 mm material
thickness. When cutting a thicker material, the pressure for the cutting oxygen can be
raised without negative effects on the adjustment of the torch.
The Gas used for the torch is Propylene, Propane or Chemtane 2:
Preferred Gasses you can cut with
UN number
Formula
Propylene
1077
C3H6 | C3H6 ≥ 99,5 %
Propane
1978
C3H8 | C3H8 ≥ 99,95 %
Chemtane 2
Table 1
It is being sold under various trading names:
Gas table
Gas supplier
Trading name
Linde Gas
MAPP-S gas
AGA
Tetreen
Air products
Apachi-S gas
Messer
Megrileen
Air liquide
Tetreen
Nippon gasses
MAPP gas
West falen
Wegaleen
Table 2

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1.3 Preparation
What do you need in order to use the PVL Underwater Cutting Torch?
1. The PVL Cutting torch kit
The PVL Underwater Cutting Torch kit includes:
•1 Underwater Cutting Torch 55º or 90º (bracket already attached)
•1 Suitcase
•2 Socket wrenches
•2 Oxygen reduction valves
•1 Gas reduction vale
•1 Gas flash arrestors/non return valves
•2 Oxygen flash arrestors/non return valves
•1 Igniter
•1 Sets of hoses
o1 Gas hoses 9mm 1 x 50 mtr
o2 Oxygen hoses 9mm 2 x 50 mtr
There are 2 types of Gas brackets
1. Gas bracket 1 is for cutting up to 5cm.
2. Gas bracket 2 is for cutting up to 15 cm
2. Gas /Oxygen Bottles
(For the Gas bottle see table 1)
The number of bottles depends on the cutting situation.
Now you are ready to follow the steps in the next chapter.

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Chapter 2 The operation
2.1 Connecting the PVL cutting torch
DANGER
ATTENTION
•Make sure that during connecting or disconnecting no sand or other
contaminations can come into the torch or the hoses. This will result in
malfunctions during cutting.
•Check hoses and connections for leakage before use.
•The PVL Underwater Cutting Torch is only suitable for underwater cutting
•Bottles should only be changed by personnel familiar with handling high
pressure oxygen systems.
•Oxygen can react spontaneously to flammable substances such as oil or
grease. Always make sure no grease, oil or other contaminants are
present on parts of the Oxygen bottle or reducers to avoid risk of fire or
explosion.
•Always make sure the bottles are changed and stored in a well-ventilated
area.
•Avoid all smoking, open fire, or other ignition sources in the vicinity of
the installation.
•The used Gas is highly flammable. In high concentrations it can cause
suffocation, in lower concentrations it has narcotic effects and can cause
dizziness, sickness and balance disturbances.

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➢Oxygen bottles can only be used vertically (these bottles should be secured to prevent
falling).
➢The Oxygen bottles are to be connected (Quads) to avoid Oxygen bottle change out.
➢The Gas bottles must always be used vertically (these bottles should be secured to
prevent falling).
2.2 Connection instructions
1. Connect the Gas and Oxygen reducers to the bottles.
2. Mount the flash arrestors/non return valves on the gas regulator and the 2 oxygen
regulators.
3. Connect the hoses to the PVL Cutting Torch and the regulators.
oThe connections on the torch are marked with:
▪O² for the Oxygen.
▪O²l for the cutting Oxygen.
▪G for the Gas.
4. Adjust the pressure of the Gas reducer and both Oxygen reducers.
oAdjust them to the pressure according to the diving depth (see table below).
oMake sure when adjusting the cutting Oxygen pressure, valve (2) should be
opened. (See photo at the bottom of this page)
oMake sure when adjusting the Gas and Oxygen pressures, valve (1) should
be opened. (See photo at the bottom of this page)
Pressure →Diving depth
Depth
(msw)
Gas pressure
(bar)
Oxygen pressure
(bar)
Cutting oxygen pressure
(bar)
0
1
4
6,5
5
1,5
4,5
7
10
2
5
7,5
15
2,5
5,5
8
20
3
6
8,5
25
3,5
6,5
9
30
4
7
9,5
35
4,5
7,5
10
40
5
8
10,5
45
5,5
8,5
11
50
6
9
11,5
2.
1.

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2.2 The Cutting
2.2.1 Start cutting
•When everything is adjusted, the diver can descend to the right depth underwater.
•Open valve (1. see picture below) 1/4 of a turn.
•Light torch with the lighter supplied with the torch (3. See picture below). (Replace the fire
stone of the lighter every day)
•The cutting head should be held in contact with the material you need to cut.
•Wait until an orange/red glow appears under the cutting head. (when the torch is adjusted
correctly this should take a few seconds.)
•Open the cutting oxygen valve (2. See picture below) with 3 turns.
•Now you can cut. Slowly move the PVL torch in the cutting direction.
Notes:
•Cutting speed will depend on both the material thickness and the experience of the
diver.
•When the PVL torch behaves restless (chatters), the Gas pressure should be
reduced a little bit (a few times 1/10 of a bar).
2.
1.
WARNING
•The PVL torch is not suitable for cutting above the water because of its
high flame temperature.
•Never try to let the torch burn above the water, because without cooling
by the water the torch head will be damaged.
3.

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Important!
When Gas is extracted from the bottle the temperature of the Gas in the
bottle will decrease. This will result in a lower Gas pressure in the bottle (ice
will be formed on the outside of the bottle), the torch will then work bad or
not at all.
When this occurs with higher outside temperatures (summer) it can be
solved by coupling 2 or more Gas bottles.
With lower outside temperatures (winter) it is required to heat the bottle
with a warm water bath.
While using the PVL torch the diver should always keep in mind the dangers
of cutting in tanks, vessels, or other closed compartments, like with all other
cutting methods.
Make sure there are no explosive or flammable materials behind the material
that is being cut.
When cutting in a closed compartment, make sure the top of the
compartment is ventilated. (drill !!)
DANGER