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Unplanned/Emergent 1 inch Dia,16MO3/EN 1.5415, Sch40 Drain Line Repair

Unplanned/Emergent 1 inch Dia,16MO3/EN 1.5415, Sch40 Drain Line Repair

Unplanned/Emergent 1 inch Dia,16MO3/EN 1.5415, Sch40 Drain Line Repair

(OP)
Trying to closeout an emergent plant outage for an imported steam turbine with blade damage due to condensate flooding inside the casing during cooldown. (Don't ask how that happened.)

One vertical steam drain line under the turbine was cut to allow water to drain out, but that cut is irregular and hand-cut (sloped, gouged, etc.) Material is EN 1.5415 16MO3 stainless, measured = 1 inch nominal pipe dia OD, thin-walled. I'd prefer a butt weld repair, but there is no purge path available for the root pass and hot pass welds, and a cock-eyed BW weld prep isn't allowed even if the usual 1/8" "fitup" gap could be restored after the pipe is prepped.

We have 1 inch dia, 150 and 300 lb socket weld couplings available in 304 and 316; and 309 GTAW wire on site. If I trim the two pipe stubs square to fit the SW fitting gap and the expansion spacing required inside the SW coupling, is there any technical reason to reject a SW repair recommendation?

If so, should I recommend using the available 308 filler metal, or go off-site to order a different filler?

RE: Unplanned/Emergent 1 inch Dia,16MO3/EN 1.5415, Sch40 Drain Line Repair

I would not a 309 fillet for DMW when the service temperature is greater than 325 deg C. If the system sees thermal cycling with high healing/cooling rates, that may be detrimental to the fillet in the socket. Im not sure if the design or repair code has any objectifs to your proposal, but other than I dont see any at the moment. I believe others mombers here may provide you with better advice though, just my 2 cents.

RE: Unplanned/Emergent 1 inch Dia,16MO3/EN 1.5415, Sch40 Drain Line Repair

(OP)
Got a reply:

Staff is recommending an
ASTM A234 Gr WP1 fitting with ER80S-D2 filler material.
Or,
ASTM A234 Gr WP11 fitting with ER80S-B2 filler material. (Since we have B2 filler, this is the practical option)

Oddly, the fitting supplier says he has only A182 material for a SW coupling, but A182 is listed for flanges in this table. Not fittings.
http://www.wermac.org/pipes/pipe_part4.html

RE: Unplanned/Emergent 1 inch Dia,16MO3/EN 1.5415, Sch40 Drain Line Repair

B16.11 SW fittings are per A182 (they arent wrought)

RE: Unplanned/Emergent 1 inch Dia,16MO3/EN 1.5415, Sch40 Drain Line Repair

". . and a cock-eyed BW weld prep isn't allowed. . "
Actually, yes it is IF they match closely. And both sides of a snaggle-tooth field cut match exactly. Gets done quite often, if no knuckle-head throws away the mating piece.

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