Other types of accumulators

We also constructed other accumulators from pipe nipple and stainless steel reducing couplings that also worked quite well as you could interchange different lengths of pipe nipple to change the volume easily. Basically any container with the appropriate fittings, and rated for the pressures you will be working with will do. 

Another type of accumulator could be pipe nipple and coupHngs 

Once you have a general idea how much variation occurs over a period of time, replace the coil of plastic tubing with a coil of stainless steel tubing with hard line valves that will give different volumes as needed. 

Using the plastic coil is a good quick technique to calculate the exact volume needed for the accumulator on the oxygen side to balance out the hydrogen side. Although one can calculate on paper the volume needed there s bound to be some error. Starting with the plastic coil technique will 

The plastic tube technique can also be used to mitigate the variable shift that occurs with liquid loss in the bubbler system when it is not refilled. In this case, simply move the pinch valve to the appropriate spot to rebalance the system. 

---

Blow molding accumulators take one of two forms. The separate accumulator is a heated chamber which is an integral part of the blow molding machine. The capacity of such a chamber can be very large and can, if necessary, be served by several extruders. The other type of accumulator is built into the parison head (Fig. 10.36). This takes the form of an armular ram that surrounds the mandrel and torpedo. The construction of the parison head becomes quite complicated and there is the potential for melt leakage and degradation... 

---