Table 36 (Continued)
If underdrain is porous and clogged by
alum floc, treat with 2 percent NaOH
solution for 12 to 16 hours.
Wash water troughs
Check level and elevation; adjust.
Check for corrosion; if present, dry
troughs, wire brush, and paint.
Clean table (console or panel) inside
Hydraulic lines (or
Check for leakage; repair as required.
4-way transfer valves Adjust; tighten packing glands or add
Lubricate with grease.
Adjust valve position indicator, if
Disassemble, clean, lubricate, and
replace worn parts.
Clean exterior, check diaphragm
leakage, tighten packing, and check
freedom of movement and zero
Disassemble, clean, and replace.
A or V