The bad effects of phosphine and hydrogen sulphide have been frequently proved.
To remove chemical impurities it is necessary to pass through water washer, drier and purifier.
Water washing of the gas does not dissolves the phosphine at all, but other impurities can be removed and cooling the acetylene temperature.
To accomplish effectively the water washing, it is necessary to pass acetylene through 30 cm water layer with below 17 cm/sec (below 60¹/cm²/h.) at 20°C.
Acetylene drier is used with the object of drying the acetylene and otherwise the purifying power of purifier is greatly decreased.
In order to avoid the loss of pressure when the calcium chloride is too high, the layer of material should not exceed 30 cm depth.
Our conclusion from 30 cm depth experiments., necessiate acetylene velocity is below 28 cm/sec (below 100¹/cm²/h).
In such case of gas running through calcium chloride layer, the relationship between calcium chloride consumption and acetylene temperatureis shown in Fig-7.
Acetylene passed through drier loss 20% of initial moisture.
In auther research on the regeneratable purifier which is widely used in our country, minimum passing time required complety fix the impurities is determined 45 second.
When the generating acetylene (water satulated) passed directly through the purifier, greatly decreases its purification power and then about half loss of power.
In welding or cutting practices using acetylene generators, safety valve is requested from safety regulation, but when we design it the acetylene velocity after passed the water layer in safety valve, necessietes below 28 cm/sec, otherwise accomplished moisture.
Finally, in order to search the relationship between acetylene pressure and delivery quantities at any sectional piping, authers calculated from the following equation.
Q=c/√1-m²⋅πD²/4.⋅√2gh/ρ
=α⋅1.375D²√h
=1.025D²√h
Where Q = m³/h
D=diameter of piping (cm)
h=pressure (mm. water column)
From this equation, table is given for the sake of convenience.

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