HOH Cells - Arrestors

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Gas Drying & Safety Arrestor

INTRODUCTION

An essential component of the use of HOH is safety, from both an equipment and personal injury point of view.

This design has come from the experimentation of the coil arrestor previewed in the last newsletter. This simple idea has been expanded upon to create a versatile and robust bubbling/arresting tool. It also follows on from the study of reducing the ph levels in the gas stream.

This device functions very adequately in this area of reducing ph as well as flashback arresting. Although this design is a prototype is may be a useful tool as is for a variety of applications. This basic design can easily be modified to be made of more sturdy materials that is less prone to leakage under higher pressure.

As a safety device this has been tested 100's of time with zero failures: Though as usual, your safety is your responsibility and it is not our advice to experiment with these things and if you choose to do so you do at your own discretion and risk.

This is a simple tube in tube design, where the gas enter in through the top port, continues down the centre tube, though an aerator, then up through the out tube and exiting via the port on the right hand side. The outer tube is filled with approximately 30mil of water, just enough to cover the aerator. The gas bubbles through the aerator submersed in water and bounces of the edges of the outer tube knocking excess moister out of the gas stream. As the volume of gas contained within this tube is small, the flash back event is minimized creating a sound similar to and electric arc. The design consists of simple irrigation fittings and can be shortened or lengthened based on the volume of gas passing through it. The unit seals very well at atmospheric pressure and shows only slight signs of minor leakage when pressurised to 30 PSI. The component costs of these items is around $40 and for the price and ease of construction represents and fantastic value as a safety device and water bubbler.
Pictured here are various photos of the flash back event within this tube. You will notice that the main arresting occurs in the top third of the tube, with some gas igniting through the bubble stream. You may also notice at the very bottom where the aerator resides that the HOH gas is igniting as the gas comes through the filter. In no instances during our testing has the gas made it past this aerator.	Click here for larger image
Detailed for you now are the specific components that are used to make this device along with step by step assembly instructions.
Aerator with 3/8 thread
1/2" - 13mm Threaded Elbow
1/2" Female - Female - Female Threaded tee
1/2" to 13mm Director
1/2" to 19mm Director
12mm PVC Tube (30mm in length) trimmed to approximately 15mm once inserted.
10mm PVC (inner) Tube (350mm in length) Can be shortened to suite application.
20mm PVC (outer) tube (400mm in length) Can be shortened to suite application.
19mm - End Plug
2 x 19mm hose clamps
Assembly Instructions
The 1/2" thread elbow has the 12mm PVC tube inserted in to its base. The 12mm hose is trimmed leaving exposed about 1cm of hose.
The 10mm PVC tube is inserted in to the exposed end of the 12mm tube protruding from the elboe.
The 1/2" threaded tee is the slid over the outside of the inner 10mm tube.
The 1/2" to 19mm director is the slide over the inner tube with the tread facing the female tee.
The aerator is screwed in to the bottom of the 10mm inner tube
The 1/2" to 13mm director is screwed in to the middle socket of the female tee.
The outer 20mm PVC tube has the end plug and hose clap attached the the bottom.
This is then slid over the inner tube connecting with the 1/2" to 19mm director at the base of the female tee. Components are then fastened using Teflon tape of sealed with PVC glue and the hose clamps are tightened. The overall length of this device can be shortened to fit within smaller spaces by reducing the size of the internal and external tubes.
Summary: Although this represents and easy to build design, it should not be used for any extended period of time and should be checked carefully between flashback events. A more robust commercial version is now available!

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