Appendix C
A-74
PolyGlide
™
sonic coupling compound is in grease form and is made from a mineral oil
base. It is rated for temperatures up to 250°F (121.1 °C). Other coupling compounds are
recommended for the following applications:
!
Silicon RTV (GE RTV-108
®
or similar) for underground or submerged transducer sites
or sites where a more permanent bond is required. (The RTV should be completely
cured prior to burial or submergence.)
!
A high temperature silicone couplant (Dow Corning 111
®
or similar) for applications
requiring the use of high temperature blocks (for pipe skin temperatures up to 470°F
[243°C]). High temperature couplant must be placed between the blocks and the pipe
as well as between the blocks and the transducers. Silicon RTV may be substituted
between the blocks and the transducers if a more permanent bond is desired.
IMPORTANT:
Do not bond the transducers with epoxy.
4.7 Nylon (Cloth) Tie-Down Straps
Two nylon (cloth) tie-down straps are supplied with the flowmeter. The nylon straps are
designed for quickly installing the transducers on pipes with outer diameters larger than 18
inches (457 millimeters). Each strap has a short section and a long section that connect
together by hooks. The short section is attached to a ratcheting mechanism. The ratcheting
mechanism tightens the strap sections to the pipe when the ratchet handle is opened and
closed.
To install transducers with the nylon pipe straps, refer to Figure 4-20 and complete the
following steps:
1. With the ratchet handle “A” in the closed position, slip the end of the long strap section
through the slot in the spindle “B”.
2. Connect the hooks together.
3. Place the strap over the transducer and around the pipe.
4. Pull on the end of the long strap section to take up the excess slack between the hooks.
IMPORTANT:
To avoid difficulty in releasing the transducers, the excess stack must
be taken up before tightening the strap with the ratchet handle.
5. Tighten the strap with the ratchet handle by opening and closing the handle repeatedly
until the transducer is held firmly in place against the pipe.
6. Lock the ratchet by leaving the ratchet handle in the fully closed position.
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