
SECTION 2-8
EQUIPMENT DESCRIPTION
FLOWMAX RO MANUAL REV: B 05/1999
USFilter
United States Filter Corporation
manifold is constructed of butt welded Schedule 10 fittings and pipe. The manifold sections are
joined by flexible couplings, that are painted with polyurethane paint to match the frame. A
cleaning connection is supplied on each interstage header and capped over with a stainless steel
blind plug and flexible coupling. A half coupling on each interstage header is provided to
connect to the interstage pressure gauge. The manifold sections are designed to accommodate
future expansion of the system with minimum rework.
Reverse Osmosis Pressure Vessels
The RO unit has 8" round pressure vessels mounted to the frame. The vessels are constructed of
fiberglass. The side ported vessels are close coupled to reduce manifolding. The inlet and outlet
connections are 316L stainless steel with groove type connections. The vessels are built to ASME
specifications, but are not code stamped.
Reverse Osmosis Membrane Elements
The RO unit is designed for 8" x 40" reverse osmosis membrane elements housed in pressure vessels
on the frame. The standard elements are constructed of Thin Film Composite (TFC) membrane
material. The membranes are designed to reject over 98% of the dissolved solids and over 99% of
the suspended solids and organic material.
Reject Throttling Valves
The reject flow back pressure is regulated by two valves. One is a stainless steel ball valve and the
other is a stainless steel globe valve. These valves are used to control the differential pressure across
the membrane surface which in turn regulates the recovery rate of the system.
Interstage Pressure Gauge
The feed pressure from each high pressure feed manifold and the
final reject line are displayed on a 0-400 PSI pressure gauge,
located on the interstage SST header. The gauge has a 63mm
stainless steel case, and is constructed of all SST wetted parts
and is glycerin filled.
Feed & Product Piping
The feed and product piping for the FlowMax unit is PVC Schedule 80. The feed piping for the
PharmMax unit is PVC Schedule 80, the product piping is sanitary PP or SST. The feed and
product piping for the FlowMax unit is 316L SST.
Sample Valves
There is a sample valve on the product line of each pressure vessel. These valves provide an
opportunity to analyze the product water flowing from each pressure vessel. The location of
these valves permit the operator to isolate the product water of a vessel from that of all other
vessels.
There is a sample valve on the common product line of the RO. This valve provides an
opportunity to analyze the final combined product water flowing from the RO membranes.