Below is from Section VIII- divison-1 Section UW-40. This section is defining the requirements for PWHT and gives a clear definition for the soak band width.
"As a minimum, the soak band shall contain the
weld, heat affected zone, and a portion of base metal adjacent
to the weld being heat...
Thanks BRIS.
Let me correct the link you sent.
http://ftp.hrwallingford.co.uk/projects/air_in_waterpipelines/index.html
They also have a book on the same subject
http://books.hrwallingford.co.uk/acatalog/ISBN%201898485119.html
I would like to add that there is also additional cost of HDPE...
What is the reason creating "saw tooth profile" for buried water/wastewater pipelines while you can just lay it as per the ground profile which would give you peaks for trapped air anyway.
By the way, in our project, the difference of ground elevation between pipeline start point and end points...
We had to install the internal floating roof before we test the tanks by filling them with water. Now we would like to skip the hydrostatic testing with seawater because;
1- IFR is aluminum and seawater will corrode it,
2- If we manage to protect the IFR by oil spraying etc, it will be quite a...
We had to complete the HDPE underground water piping installation before we receive the valves so we had prepared and used flanged pipe spools having the valve length and diameter sizes. Now we cannot take them out. They are stuck between the HDPE flanges. Even if we take them out installing the...
As far as I understand API650 requires top and intermediate wind girders ONLY for "open-top" tanks. Is there any rule mandating the use of intermediate wind girders for tanks with internal floating roofs.
Gokhan
API 650 leaves it to the owners decision but is it a general practice to open drain and vent holes on roof supporting columns (12" 16meters) so it will not try to float.
Thanks for the comments..
I am looking for tolerance figures for buckles on the surface of the finished tank. They do not look nice and I have to convince the erection contractor that they are out of tolerance.. and API 650 does not help much.
Thanks in advance for any advice/guidance..
Gokhan
Thanks NozzleTwister and JStephen,
We made a trial and cut a 4" and a 10" 90deg elbow at 45deg. The cuts were normal to the tangent line but still we got a slight elliptical shape (2~3mm at diameter). I will check what the diameter tolerance given in B16.9 Otherwise, as NozzleTwister points, we...
Thanks again for all the replies..
Pipe sizes are ranging from 4" up to 24". We are building a new tank farm and layout of tanks, piping routing and tank nozzle heights mandate to trim the elbows other than 45 and 90deg. And I do not want to use miter elbows especially on pump suction lines...
What do you think about cutting the standard fabricated CS elbows at site to suit pipe routing for low pressure piping systems with design temperature max 60degC.
Piping designer has drafted the system to use "on site cut elbows" but 3rd party inspector says "NO !".
Thanks in advance for the...
