Recommended de-watering for non-piggable piping after hydro test
Recommended de-watering for non-piggable piping after hydro test
(OP)
Hi all,
for piping systems that may not be piggable or does not have the equipement set up for pigging, what ways can you recommend for de-watering those kinds of systems after hydrostatic testing.
is turning on the well to have the wellhead flow stream displace the water a good idea?
Can air compressors be used?
what about cases where you have low-end traps, e.g. P traps or U leg in the system...
Any suggestions..
BTW, there are no low end drains installled
THANKS FOR YOUR HELP
for piping systems that may not be piggable or does not have the equipement set up for pigging, what ways can you recommend for de-watering those kinds of systems after hydrostatic testing.
is turning on the well to have the wellhead flow stream displace the water a good idea?
Can air compressors be used?
what about cases where you have low-end traps, e.g. P traps or U leg in the system...
Any suggestions..
BTW, there are no low end drains installled
THANKS FOR YOUR HELP
As much as possible, do it right the first time...





RE: Recommended de-watering for non-piggable piping after hydro test
Having said all that, back before I got the pigging religion (after having repeated corrosion failures in small non-piggable laterals) I would unbolt a flange on one end of the tested system and shove in a pig. Then I'd bolt on a blind with a fitting for an air compressor and open the far end. Compressed air pushing a foam pig will dry up most lines in 2-3 runs (the foam pig may not last more than 1 run, have several on hand).
That works for lines that are non-piggable due to lacking pigging equipment. If it is non-piggable because of barred tees or comming into the branch on a tee or some other silliness, then my original statement holds--you're hosed. Trying to evaporate the water with air will take a while (weeks), and you don't have a lot of other options.
David
RE: Recommended de-watering for non-piggable piping after hydro test
If you just have to pig, as zdas says, unbolt a flange, or cut into the line and install temporary launchers and receivers.
From "BigInch's Extremely simple theory of everything."
RE: Recommended de-watering for non-piggable piping after hydro test
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Recommended de-watering for non-piggable piping after hydro test
@ Sjones: there's usually 1 day to 1 week between hydrotest and commissioning. The water quality is good from a silt, salinity, and PH standpoint. sometimes dry gas and other times mixture, but the first equipment downstream of the hydro test segment is usually a separator, and/or tank...
As much as possible, do it right the first time...
RE: Recommended de-watering for non-piggable piping after hydro test
RE: Recommended de-watering for non-piggable piping after hydro test
As much as possible, do it right the first time...
RE: Recommended de-watering for non-piggable piping after hydro test
From "BigInch's Extremely simple theory of everything."