PEP Filters BMF - Manual (Page 3)

BMF Series Media Filter
Operating & Maintenance Manual
PEP Filters • 322 Rolling Hill Road • Mooresville, NC 28117 • 800-243-4583 • www.pepfilters.com
704-662-3133 (Outside USA) Page 3 of 14 Fax 704-662-3155
rev. 01/02
General Description
The BMF Series Industrial Water Filters are permanent media type units specifically designed to clean cooling tower and other
industrial process water. The filters may be used for both side-stream and full stream applications in pressurized and non-
pressurized systems. Standard BMF series filter vessels are rated for 50 psig (345 kpa). Optional higher pressure ratings of 100
psig (689 kpa) and 150 psig (1034 kpa) are also available. Vessels are available in both non-code and ASME code construction.
Filter Operation
Water from the system is pumped through the over-drain assembly at the top of the filter tank and distributed evenly over the
media. Unfiltered water flows downward through the filter media where suspended particles are trapped. The filtered water then
passes through the vessel and out the under-drain assembly at the bottom of the filter and returns to the system.
When the trapped particles cause the pressure differential across the media bed to reach a pre-determined pressure of
approximately 16 psig, the valves are automatically or manually repositioned, and the media is washed. The media is
backwashed with a rigorous scouring action, releasing trapped particles within the media. The dirty water passes from the filter
vessel through the over-drain assembly at the top of the vessel and flows to drain. After the backwash cycle (field adjustable and
factor pre-set at 3 minutes), the filter valves are again repositioned and the filtration cycle is resumed.
Installation
Unpacking
When the PEP Industrial Water Filter is delivered to the jobsite, it should be inspected thoroughly to ensure that all required items
have been received and that filter equipment is free of any damage that may have occurred in transit. Any damage must be noted
on the bill of lading at the time of receipt. Otherwise, there is no recourse to recover the cost of damaged goods.
The filter model number appears on a nameplate located on the unit and should be checked against the invoice/packing list.
Rigging
BMF filters should be lifted with a forklift or overhead crane. If these units are lifted with an overhead crane, lifting straps must
be located below the filter skid and should not come in contact with the filter components. If no skid supplied, lift from the lifting
lugs located on the filter vessel top.
All PEP industrial water filters should be rigidly anchored to the floor or support steel by means of anchor bolts. All BMF
filters have an anchoring provision.
Once the filter is installed in its permanent location, the pressure gauge and air relief valves should be installed on the top of the
filter tank (some units will have these items already installed). The sand media is loaded into the filter next. Refer to the section
in this manual “Loading the Media” for the proper loading procedure and the appropriate quantity of media necessary for each
size filter vessel.
Piping
The BMF filter should be installed using the pipe size indicated in Table 2.
Connect the unfiltered source water from the system sump or piping to the connection labeled “Inlet”. Note: If the filter is
supplied with a pump and the inlet connection is located above the operating water level of the system sump, install a foot/check
valve to maintain a prime on the pump and prevent loss of pump suction.
Connect the return line from the connection labeled "Outlet" to the system sump or filtered water return piping.
A service or isolation valve should be installed on the inlet, outlet and city water line (if city water is used) to allow filter
servicing. For units using a backwash source other than the system sump, refer to Table 3 for the required backwash flow rate.
Attach this line to the connection labeled "City Water". The maximum city water backwash supply pressure on the BMF filter
vessel should never exceed the vessel pressure rating. If public or municipal water is used for backwash, a back/low prevention
device or check valve is required on the line city water line (in accordance with local or other governing codes).