WV-F-2849
1/2 gpm per square foot (0.032 L/s per square meter) of filter bed area. Filter
capacity for type III units shall be based on a flow of feedwater of not greater
than 1 gpm per square foot (0.063 L/s per square meter) of effective filter
q edia area.
3.8 Performance. When operating at the conditions specified in 3.6, the
feedwater effluent quality from the filter system shall not exceed the maximum
concentration indicated in table I. The oil content and suspended solids and
free residual chlorine content of the boiler feedwater shall be expressed in
milligrams per liter (mg/L). The turbidity shall be expressed in nephelometric
turbidity units (NTU) as defined in ASTM D1889. Nephelometric turbidity
measuring methods shall be used for feedwater with less than 40 NTU. When
operating with feedwater impurity levels specified (see 3,6.3), the cleaning
operation shall be not more than once every 24 hours for type I and type II
units . The filter bed for type II units shall require replacement not more than
once every 6 months. The disk-cartridge for type III units shall require
replacement not more than once every 3 months. The operating hours shall be
based on the filter unit not exceeding a 15 psi (100 kPa) pressure differential.
3.9 Dimensional requirements. The layout of the equipment shall be in such
manner that all components shall be located within the boundaries of the plot
dimension (length x width), as specified (see 6.2), with provisions for adequate
room for installation, operation, and maintenance of each individual component.
3.10 Type I components.
3.10.1 Filter tank. The filter tank shall be welded carbon steel, equipped
with supports for the filter leaves or elements. Division members between
compartments shall be tightly attached to the shell so that no fluid can be
bypassed. The tank shall have a feedwater inlet, feedwater discharge, sludge
drain, vent, pressure relief device, and gage connections. The filter inlet
shall be so baffled that the filter layers shall not be disturbed by incoming
The interior arrangement of the tank shall permit cleaning
feedwater,
operations and removal of interior components with ease. The tank shall be
equipped with a quick opening and closing head. A support designed so that the
head may be withdrawn or swung out of the way for leaf removal shall be
provided. A support or fixture shall be provided to facilitate handling the
leaves when they are removed and returned to the tank. The design and
construction of the filter tank shall conform to ASME Boiler and Pressure Vessel
Code, Section VIII, Division 1, and shall be furnished with the ASME Code stamp.
The filter tank shall be securely mounted on support legs or cradles. When
specified (see 6.2), the -tank shall be -equipped with a filter element so that
the used precoat can be separated from the flushing water when the flushing
water is discharged to the floor drain.
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