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1.for DBB valve, any difference between reduced bore one and full bore one? 2.is there float needle valve? its construction? i need your advices,thank you in advance.

Pls refer to the attachment: there are two shutdown valves---one 4" and the other 2" Q1: why use different sizes SD valves? Q2: the purpose of 2" SD valve connecting with a choke valve? Pls don't hesitate to share your ideas, thanks...

for the ELBOW description, i really donot understand WPB, THD, GALV. PLEASE give share your understanding with me. thank you.

@ EmmanuelTop thank you very much!i think the attachment is one page of a book and i am interested in this book. where can I purchase the book?

I would like to know the difference between swing elbow and normal one and its application. I need your advices. thank you.http://files.engineering.com/getfile.aspx?folder=d2e1b3a0-6daf-4d25-b7f9-7bfc83691d29&file=11.png

I know hot bends are used in pipelines,but i would like to know the application range of both ones. can anyone help me? THX

For example: PIPE;LOW TEMP.CARBON STEEL 6 " NS,27.8 mm Thk ,168.3 mm OD ,1.094" Thk; SEAMLESS; ASTM A333 GR.6; NACE MR‐01‐75; BEVELLED ENDS NS underlined

now the attachment can be downloaded normally.

please refer to the subjecthttp://files.engineering.com/getfile.aspx?folder=50f392ed-a3f4-4cb6-abd8-929803c07bc0&file=20150319114824.png

In PID, where should I place the spectacle blind, before valve or after valve(flow direction)? I need your advice

thank you everyone! I learned a lot. MortenA you are right, i assign the name of J-T valve,describing the function, there is no j-t valve.thank you so much. Hi,25362 thank you for the thread provided.it includes many useful informations

Hi, everyone! while doing hysys simulation, I found that following the J-T valve,the hydrocarbon gas T decreased, but for crude oil(liquid), it increased. why? is the liquid different from the gas on T passing through J-T valve? thanks in advance

when i check the Cause and Effect Diagram, sometimes the pump is tripped, sometimes the pump is inhibited. For example, the cause: oil separator ESD valve off open limit-----the effect:downstream charge pump is inhibited; the cause: HH pressure 3rd stage separator------the effect: downstream...

Hi, i am looking at the PID, and i don't know what is the function of the bypass line with ball valve and globe valve, can someone tell me? thank you in advance