Waterman Stop Logs manufactured from
steel, stainless steel and aluminum can be
specified for use to control flows in waste
water and sewage treatment plants, pumping
stations, irrigation canals and power plants
intakes. A resilient seal along the bottom
of each log seals on either the sill plate or
top of another log. Side seals are generally
incorporated into the logs to provide for low
Guides are normally mounted with anchor
bolts in a blockout but can be designed for
embedment in the concrete. Stop Logs are
placed and removed by a log lifting device
and client's overhead crane or mobile crane
on larger sizes. The lifting device can be
operated from the deck of the structure. The
stop logs must be lowered and lifted under
water balanced condition.
Waterman of Egypt has supplied stop logs
along with their guides for controlling channels
of up to 15 meters deep in petrochemical and
power plants in the Middle East.
The stop log shall be fabricated in several sections. The stop log frame shall consist of side
guide rails and sill plate. The side guides shall extend from the channel invert to the top of wall
elevation. A log lifting device shall be supplied to lower and lift the logs.
STOP LOG FRAME (GUIDE RAILS AND SILL PLATE)
The guide rails and sill plate shall be fabricated from either stainless steel, aluminum or painted
mild steel as indicated in the contract specifications. The guide rails shall be U section and shall
have full length equals to the channel height. The guide rails and the sill plate shall constitute
a complete frame. The frame must be supported to the concrete structure by anchorage
system as indicated on Waterman submittal drawings.
The stop log shall be manufactured in several sections. The stop log leaf shall be a plate
reinforced with structural shapes welded to the plate. The log shall not deflect more than 1/360
of the stop log nominal width under maximum head. The stop log top plate shall be provided
with two openings to act as click-in device to grip the lifter hook for lowering and lifting the log.
The log shall have bearing strips at both sides and back made of UHMW Polyethylene to act
as a bearing surface to help the log slide into the frame.
STOP LOG LIFTER
A lifter shall be supplied to lower and lift the logs. The lifter shall be of sufficient weight that it
will positively engage the log when lowered into the stop log frame. The lifter shall include two
hooks one at each end. Unlatching of the stop logs shall be easily accomplished by personnel
on the operating floor with the use of a lanyard. The lifter shall be equipped with special
arrangements to be capable of being attached to the client's crane. One lifter shall be provided
for each stop log width.
Bottom seals: A resilient seal along the stop log bottom shall be incorporated on each log. The
seal shall be of the lip type seal with minimum seating surface of 25mm to 50mm on larger logs.
Side seals: rubber seal along each side of the log face plate shall be attached to the log. For
application that may have flow in both directions, double seals are available.
Stop Log and Frame
Stainless Steel - ASTM A-240/A-276, Type 304 or 316, as specified
Aluminum - ASTM B-209 Alloy 6061-T6
Mild Steel - ASTM A-36 or DIN 17100 St. 37-2
Stainless Steel - ASTM F-593 and F-594 Type 304 or 316, as specified
Neoprene Rubber - ASTM D-2000
UHMW PE - Ultra High Molecular Weight Polyethylene
Mill finish on all stainless steel and aluminum surfaces
Epoxy paint for mild steel surfaces
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