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Re: [TCML] Opening an inspection port on a pole pig
Are you sure there isn't an access on the side of the pig for changing
the tap? My pig has a black plastic round cover on the side of the pig
(with a seal around the inside edge). The cover unscrews. The purpose of
the cover is to keep moisture off of the tap switch itself. The tap
switch is then accessible and can be turned with a wrench.
The top cover thumb screw simply unscrews ccw and is designed to
distribute pressure evenly on the top cap for the large cover seal. To
remove the top cover, just unscrew the thumb screw, gently pop the seal,
and the cover will pop off. But like I said, the tap switch should be on
the side of the pig inside an access cover (about 2" diameter), at least
if it's anything similar to my pig.
David Speck wrote:
I recently purchased a Westinghouse pig with a tap changer switch
inside. There is no external handle for it.
It came set for the lowest voltage, and, naturally, I'd like to switch
it up to the highest voltage. ;o)
There is an oval access cover in the lid measuring perhaps 4 x 8",
with a flat thumb screw in the center. I figure this is an access to
allow oil filling, and perhaps tap changing without pulling the whole
thing out of the tank.
However, the unit has been freshly painted over, and the thumb screw
doesn't turn (at least not easily).
Before I go and break something, can anyone tell me the proper method
to open the inspection cover?
Does the thumb screw drive a quarter turn latch mechanism, or does one
unscrew it completely to get the access cover off, or is the cover
plate just held in place by a spring clip? I'm betting on the first
design, but thought I'd ask before applying the ChanneLocks to it and
likely breaking something.
Not that I plan to do it anytime soon, but out of curiosity, how does
one pull the core out of the tank? I assume that it all hangs from
the cover, as there is a robust lifting ring in the center of the
lid. I don't know if there is anything that holds the cover to the
main body of the tank, or if it just relies on gravity to keep it
Thanks in advance.
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