Hello, I was hoping some people here could tell me about their careers as pipeline engineers, if they started with a mechanical engineering degree. I don't mean process engineering - I'm considering the paths I can take with my degree (mech eng).
I currently have 3 years experience in mining -...
OK so the clause (iii) means no more than 7000 at 120% or above the design pressure (and I assume -20% below the minimum allowable pressure).
Read literally, the clause can be taken to mean variations below the design pressure, if they are of 40% of the design pressure, are 'significant'. e.g...
In AS4041 (Australian Pressure Piping standard) there is a section and clause that I am trying to understand. It is also (I've been told) in the one of the B31 codes. It is 3.10.3 (variations of pressure, mainly point (iii) and onwards).
It reads as follows:
3.10.3 Variations in normal...
Funnily enough a pressure reducing valve failure followed by a downstream relief valve activation is just the sort of situation that can cause an operator to go 'oh shit, leak' (and at 100L/sec thats quite a leak) and immediately run to the nearest isolation valve and close it *as quickly as...
Hello,
In the design of a recent pipeline a fellow engineer and I discovered that the largest transient pressures in our pipeline would be caused by a pressure relief valve activating, and an operator shutting off the pipeline while it was activating. We were wondering if this is normally...
Not sure if this is the right forum, but...
We have a mechanical specification for hydraulic machinery that lists all rock breakers must operate at pressures below 180 bar.
I've had a look at a number of rock breakers on the market and pressures far above this (over 300 bar) are common. My...
Not sure on gasket material. I had a look at our pipe spec and it basically just stated 'suitable for system pressures, temperatures, contents, and coal mining conditions'.
The pipe spec. was written by another person, so I'm not sure what bolts either beyond 'Stainless steel bolts and nuts to...
We're using stainless steel fittings on a pipeline containing emulsion (HFA fluid for coal mining longwall). The 5km pipeline(other than the fittings for isolation points, drain points, etc.) is HDPE. This is all due to a client request.
The line requires pressure reducing stations. These have...
Thanks again for the responses.
I should have mentioned the hydraulic grade for this pipeline under normal operating conditions does follow the grade of the earth fairly closely and negative pressures will not occur. However, under normal operating conditions the flow is throttled.
If someone...
Thanks for the responses.
One of the pipelines I'm considering goes down a mine.
One problem related to air entrainment is that this pipeline, which may be considered essentially as a pipe running down a very long hill (drift/mains), is half DN125 pipe and half DN140. This causes below...
Simple question with a probably not-so-simple answer: How do you generally account for the losses in pipelines caused by air pockets, that (as far as I've been told) can intruduce a restriction in the pipe (by reducing the effective cross sectional area) at the point where they're located?
Thanks stanier, I had a look at the Vinidex catalogue and some of its references are as follows:
AS 2033-1980
AS/NZS 2566.1-1998
AS/NZS 2698-1984
AS 3723-1989
AS/NZS 4129(Int)-1997
AS/NZS 4130-1997
AS/NZS 4131-1997
Looks like it's an old catalogue that needs updating, hence the low figures...
Thanks for the advice.
I cleared up the issue after some digging around the office. Hope this helps anyone who runs into the same issue. To quote the message sent to me -
"The discrepancy is related to the compilation date of the two Manuals,which reflected the recommendations of Standards and...
I have some conflicting information from Vinidex (Aus HDPE pipe manufacturer) on the allowable pressures for their HDPE pipes.
Australian Standard 4130 lists a MAOP (maximum allowable operating pressure) for PE pipes. Doing the calculations from the standard for 35 degrees (celcius) and PN25...
Australian standard AS 1692 "Steel tanks for flammable and
combustible liquids" states -
"2.2.7 Liquid seal
Every fill pipe, suction pipe or dip pipe that enters through the top of the tank and that is likely to be opened to atmosphere at some time during normal filling, shall be provided with...
