thread809-204059
Why is it that there is no reference of a double-wall arrangement in the API STD, even as a reference, committee interpretations so far? Will it not need a qualification for a double-walled arrangement wherein say an 80 m steel tank is enclosed by another steel tank offset...
Many Company Spec includes a restriction on the chemical composition of the steel. A typical one is like this C 0.2 wt %, Mn 1.3, P 0.01, S 0.002, Si 0.4, Cu 0.4, Ni 0.4, Cr 0.3, Mo 0.12, V 0.015, Ni 0.015, Ti 0.02, B 0.0005
A Carbon equivalence CE = C + Mn/6 + (Ni+Cu)/15 + (Cr+Mo+V)/5, limited...
Manufactures claim on literature that the triple off-set butterfly valves are sealing in both directions. But from experience it is known that the valve does not hold effectively against the normal flow direction. The valve standard API 609 does not address whether there is an inherent design...
This post was earlier made under ANSI (standards) code issues. I have flagged the entry for removal from there.
I am looking at a 4" class 1500 ASME B16.48 thickness dimensions for a RF and RTJ.
RF : 22 mm, is the thickness excluding the facing
Female RTJ : 48 mm
RTJ groove depth : 8 mm...
thread794-422928
API 6A gives in Table 52 the rough machining detail. The depth to which material may be removed is 8 mm for a R39 4 1/16" class 5000 groove. This is the same as the raised face available on the flange.
I have a CS spectacle blind that needs to be overlayed with Inconel 625...
thread177-351078
The ASTM spec for low alloy tubing does not specify a mill hydro test. It is neither there in the recommended supplementary tests.
A106 and A213 specs do call for mill hydro tests.
What is the reasoning why the A519 excludes the mill test.
The Klingersil C4430, a synthetic fiber gasket reports the following m and Y values for various thickness values vs the corresponding in ASME Sec VIII Div 1 Mandatory Appendix 2 for Bolted Flange design Table 2-5.1.
Klingersil C4430, Thickness mm, m, Y psi
1, 4.5, 3625
2, 5, 3625
3, 5.5, 3625...
ASTM A234 WPB pipe fitting have a Cmax content of 0.3 and a Ceq of 0.66 corresponding to the max range of the constituents. There are specs requiring the C content limited to 0.23 and Ceq to 0.42 so as to provide weldability. Will the weldability become a problem if the C content comes close to...
thread292-164732
http://www.eng-tips.com/viewthread.cfm?qid=426101
I never realized this until I start to read the description of the B18.2.1
I wonder if someone can clarify what is the intent of B18.31.2 and why ASME B31.3 and B16.5 does not make reference to it?
The thread292-404005 says that depending on whether some free threads are to be left, either of B18.2.1 or B18.31.2 may be used.
The listed standards in ASME B31.3 and B16.5 for stud bolts and nuts are B18.2.1 and B18.2.2.
The descriptions of the B18.2.1 is,
Square, Hex, Heavy Hex, and Askew...
A typical client spec for CS Pipe fittings used in the Upstream Oil and Gas industry reads as, "All carbon steels, including normalised steels, used for the fabrication of fittings shall have a maximum carbon content of 0.23 %."
ASTM A234 Gr B or C, generally used, has a C content of 0.3 to...
This subject had a reference under thread404-7823,
Why is that Instrument air service of 7 bar (g) pressure cannot use MI fittings. Why is it required to use class 3000 threaded forged fittings. In some cases it is required to go for class 6000. I do not see it used although allowed by B31.3...
Why does ASME B31.3 Table 341.3.2 call for RT examination of fillet welds. How should I read this. I understand that RT on fillet is difficult and others methods are to be used.
I found the following reference in here, http://www.eng-tips.com/viewthread.cfm?qid=225832 but not what I am looking for.
A pair of 4" class 1500 RTJ WN ASME B16.36 Orifice flanges, the tap location was drilled in error at 34 mm vs the 24 mm required from the flange face. The orifice plate is held in a RTJ carrier. The machinist tried to center the tap over the flange thickness. The Orifice meter is to be used to...
ASME B16.5 RTJ Joint detail does not specify any hardness value for the material. whereas the gasket standard specifies the hardness range that can be there for a material of the ring. Is it implicit that the hardness that is there for a CS material is a certain figure. How does one ensure that...
API PSL1 and PSL2 pipes have Sulphur content limited to 0.03 and 0.015%. Further it says in Annex H that PSL 1 pipes are not suitable for SOUR service.
In ISO 15156-2 section A2, it says most grades of API 5L pipes are acceptable and does not make any distinction between the PSL s nor does not...
ASME B31.3 Appendix X for Expansion joints makes reference for the use of listed materials for pressure containing parts.
ASTM A36 / A307 CS rods are listed material in Appendix A. Is there any code limitation other than that rods have to have the area required to hold the design pressure...
What seems to be the intend of the hydro test specified through the below, Is it not a strength test. At 2500 psi, it does not seem to be.
"22. Hydrostatic Test Requirements
22.1 Except as provided in 22.2 and 22.3, each length of
pipe shall be tested by the manufacturer to a hydrostatic...
Can anyone please explain from first principals the API 521 equation used for the thermal expansion and the consequent confined volume pressure increase. I want to know whether the same equation may used for a ball valve cavity pressure estimation.
