Membrane Configuration Sample Clauses

Membrane Configuration. Each stream has four independent banks of membranes fed from a common header running the length of the stream. This arrangement allows a bank to be isolated with the stream operating, so that membrane cleaning or maintenance can be carried out with no loss of water production (assuming the Standby Bank is operating). Each individual bank is further divided into two half banks, each of which can be isolated from the main stream. Each half bank has three feed, reject and product risers, with the capacity for 22 pressure vessels per riser, making a maximum capacity of membranes per stream of 528. The initial design value was 448 membranes per stream. The membranes were of the hollow fine fibre type, Du Pont Model B10 6840T, each housed in a single fibreglass pressure vessel. Figure 9 shows one of the first pass streams from the feed / brine side. An extensive on-line monitoring system is provided for measuring a total of 192 membrane differential pressures, one membrane per riser and each of the half bank product conductivities is also monitored. Provision was made for extensive manual differential pressure measurement to supplement the on-line measurements when required. This system is one quarter the capacity of each of the main streams and is equivalent to one bank (4 banks per stream) of the main first pass streams. It’s purpose is to operate during the cleaning of one of main streams, which is done on a bank by bank basis, so that the full plant’s capacity can be maintained.‌‌ The configuration is very similar to the first pass main streams, except that there is no energy recovery turbine, no equivalent second pass system and the product water is fed directly to the drawback tanks.