Regarding hydrotest of pipline
Regarding hydrotest of pipline
(OP)
Dear sir,
We are doing the piping work as per B 31.3.
i have two queries
1) What will be the longest length of pipe line allowed for hydrotest.
2) what will be the allowance in between the working temperature as per secification and hydrotest temp.
Example: working temp of line is 37 degree celicus, then at what temp. we will allow to do hydrotest.
Regards
Prasad
We are doing the piping work as per B 31.3.
i have two queries
1) What will be the longest length of pipe line allowed for hydrotest.
2) what will be the allowance in between the working temperature as per secification and hydrotest temp.
Example: working temp of line is 37 degree celicus, then at what temp. we will allow to do hydrotest.
Regards
Prasad





RE: Regarding hydrotest of pipline
I don't believe there is any restriction on length or volume. You can, in theory, test hundreds of kilometres of pipelines ( not normally practical due to elevation differences).
At 37 C operating you can test to the same pressure at ambient temperature. B 31.3 has a section where you vary the test pressure at ambient test conditions to match the pressure if the operating temperature is greater than about 37 Deg C where de-rating of the material applies.
Pipelines designed to a pipeline code are different to piping. You need to read the relevant section of the correct design code.
What are you hydrotesting?
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Regarding hydrotest of pipline
RE: Regarding hydrotest of pipline
RE: Regarding hydrotest of pipline
I want to know a what we applies as per "Standard good engineering practices".
I think,practically 1 Km is the standard practice to test/inspect max. length during hydro.
Regards
Prasad Rode
RE: Regarding hydrotest of pipline
As we appear now to be talking about above ground piping? 1000m is a short distance. B41.3 requires that you leave exposed all welds, joints and attachment welds for examination.
If you need to test longer distances either have more people to check longer sections at the same time or walk faster.
It's all about the specific systems - in some cases it makes sense to pressure test spools of 15 to 20m, in other cases ( long pipe runs), you might be able to do 15 to 20km.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.