Piping & fluid mechanics engineering | Forum profile

There are often if not always different opinions as to what a hydrotest is meant for. Some believes the major concern is for detecting leaks or construction flaws, others consider the test is performed to create stresses exceeding those at operating conditions. Some feels it is a method to detect errors made in design calculations, others consider it can produce a benefic stress relief effect. I personally consider hydrostatic test as the...

( B31.3 allows fitting design, \(b\) A flange may be designed in accordance with the BPV Code, Section VIII, Division 1, Appendix 2, using the allowable stresses and temperature limits of the B31.3 Code. But I don't have BPV-VIII, so it would be helpfull if you gave the formulas you were using.  I don't have your Chiyoda document either. If it was straight pipe, which it isn't, B31.3-2008 p304.5.1 says you can...

To confuse the issue even more, there used to be ASA which morphed into ANSI. In the past few years, ANSI has made a handoff to ASME on some standards, so yes, B16.5 can correctly be called either ANSI or ASME depending on the publication date of the document. Now, ASME may be morphing into some other acronym somewhere down the road. Fun stuff, Huh? "Who's on first?"  

Thanks all for great advices, I contacted the manufacturer and the problem is that factory connecting kit for tanks is rated for flow of only 20 l/h, our contractor had installed heating oil tanks and never checked the ratings. Obviously this configuration can not withstand flow of 200 plus l/h that our generator's pump is drawing from tanks. BigInch was right from the beginning that pump is always drawing most of fuel from tank D...

To mount any solid part in a flowing fluid (gas, water, steam, laminar or turbulent liquid) and create as little resistance to the fluid stream as possible, you MUST mount your sensors and parts inside a streamlined hollow shell, with absolutely smooth surfaces and radiused connectins to the pipe wall, and with as small a "frontal face" to the liquid flow as possible. A round cylinder sticking into the fluid has a relative...

( mvujica.... OMG...Plastic tanks....plastic pipe & valves.... etc etc !!! You are asking...no, no begging for a disaster with a diesel fuel system. ASME B31.1 and NFPA-30 ban use of non-metallic materials in these types of installations. What has your insurance carrier said about the use of plastic ? Is this a marine or on-shore installation ? Where is this located ? With metal tanks, you are allowed to have nozzles at the bottom of...

@ione Not sure why you are mentioning shaft work since the expansion is a work-less process.  If you look at the graph I attached to my earlier post, if the expansion from the smaller tube (where M=1 to start with) causes a decrease in T_static, then you would necessarily have to violate the principle of choked flow since a decrease in T_static would require that the flow be supersonic, something clearly not happening in an...

Thanks for the reply again. .043 cfm (material) seems really low. That means it would take nearly 3 hours to fill a 55 gallon drum.  

( I think I've got a way to do it. Draw from/ return to just one tank as desired. Connect the rest with siphons so they'll self- level. Prime each of the siphons by evacuating it with a pump.  It doesn't have to be a big pump, because you don't care how long it takes to fill the siphon.  It does have to be graceful about passing liquid.   Instead of trying to switch off...

ANSI may still exist but ASME maintains the machanical engineering standards.  My list of remaining ANSI standards includes Z4.4 sanitation if field and temporary labor camps, Z129.1 hazardous industrial chemical precautionary labeling and Z400.1 MSDS preparation.