Worked on a project recent years where we considered using stress ratio but combined stresses clause thought to be impractical so created LTCS pipe class for affected lines with impact testing at -50 DegC.
Reducing Tee is usually preferred in branch tables 1-2 sizes down but guessing selection of sweepolet is due to vibration concerns although I would have thought that would be in lieu of weldolet type not reducing tee.
API 600 I believe has just standardised typical trims with typical services therefore you can quote API Trim 5 outwith API 600 Valves in your case API 6D.
In my experience in mostly Oil & Gas if you join as piping materials engineer that will be area you are working as piping has 3 general areas within disciple which are layout, stress and materials the latter 2 being considered the specialised within piping.
You will be responsible for...
Seems strange one to me as for there is no change in allowable pressure under 38°C (41.4 barg 316L) and fig 323.3.2b not relevant for SS in my view as impact testing not required.
It may be that your piping specs require additional measures e.g. valve testing, packing at temperatures lower than...
LI is correct in his interpretation and the notes accompanying table important, be careful if you are defining your piping class minimum temp (API 5L GrB) as -29°C as it is related to wall thickness. I would steer away from Stress Ratio except for short term conditions where you will have to...
I am not a stress engineer but can tell you in Middle East Projects which I have been working on in Client side in recent years use of non metallic piping for water systems including FW is common. Most of my experience is with GRE but current project is HDPE which is underground only due to...
As pointed out by XL83NL it is more common to spec 316/316L and 304/304L and get the increased strength of former and weldability of latter. Dual certified are readily available from suppliers more probably than single spec as can be seen from your vendor offer.
In general minimise flange joints as they are considered potential leak path therefore use when connecting to equipment, valves or instrumentation and as mentioned for certain services such as lethal/toxic all connections may be welded type. For hydrocarbon service you may also be required to...
In my experience in piping we ask for equipment supplier to provide counter flanges for their nozzles where they are outwith ASME B16.5/16.47 scope with us providing wall thickness of connecting pipe.
Guys,
Thanks for response.
In the case in attachment it is 4x6 PSV and isolation in this case is gate valve and all valves are mandated full bore at PSV and API 520 guidelines are being met regarding flange sizes etc. This is just one instance in this process plant area with all PSV taking...
Our Contractor on this FEED stage of project has taken this approach to configuration of PSV discharge piping going to closed system in this case to flare with the purpose being to save money on isolation valve side. (see attachment)
I have not seen this approach before and we have concerns...
You do not mention pipe diameters as it is common to have a minimum schedule for small bore piping for mechanical strength e.g.operators standing on skid piping.
I don't personally use Stress packages so I cannot comment on pro & cons but after 15 years of working on client side in Middle East Oil & Gas Projects I can tell you that the client will dictate which software is to be used in Scope of Work based on its preference and regarding stress I have...
See uploaded file which IMHO gives a reasonable approach to acceptable handwheel heights but actual may vary between clients and their operation preferences. Note that 71 inch seems to me to be on the high side except for small bore valves, think of the torque required.
I would also add that it...
IMO your vendor will have a minimum size including branch which he can FBE line say 3" flanged branch and from there you will probably have to use reducing fittings in suitable corrosion resistant alloy to get to size you require.
I don't think you would get a code reference for full port/bore but common definition would be no restriction in the piping therefore in practice you could push a pig through system for cleaning or require no pressure drop and/or flow loss. IMO your supplier is supplying reduced bore ball valve...
Does 316 meet the criteria for fluid and design conditions and if so present to client as suitable for service. I have typically in the past changed the requirement for 304 to 316 if suitable for service when 304 has been minor quantity in comparison and usually more economical in bulk order and...
If my understanding of intent is correct is to add spectacle blind at least at higher pressure side so positive isolation an be effected in event of any failure, it can be turned during draining.
I would prefer station 2 configuration as it makes it easier to spring the flanges if needed although station 1 is correct regarding dead leg. I would also prefer the vertical configuration for space constraints but offset the bypass to allow maintenance/lifting of CV. A common compaint I see...
