An existing, in-service vessel was originally constructed and stamped to ASME Section VIII, Division 1. Various nozzles do not meet the UG-45 requirements in effect at time of fabrication nor the same requirements which are currently in Table UG-45. The vessel now falls under the jurisdiction...
An existing carbon steel vessel, which was not impact tested, is being evaluated for suitability. Desired MDMT is -150 F. When operation will occur at this temperature general membrane stresses are such that the ratio as shown in Figure UCS-66.1 is less than 0.35.
Local stresses at nozzles...
An existing carbon steel vessel, which was not impact tested, is being evaluated for suitability. Desired MDMT is -150 F. When operation will occur at this temperature general membrane stresses are such that the ratio as shown in Figure UCS-66.1 is less than 0.35.
Local stresses at nozzles...
Two existing girth flanges are mated together. One flange has a nubbin 1/64” high and 1/8” wide. The gasket used between the flanges is DJAF iron, that is 1/2” wide.
Question:
When considering the facing on the flanges as Type 2 (per Table 2-5.2, from Sec VIII, Div 1, Appendix 2), the joint...
Recent Code Editions have included a new factor, termed "W" (Weld Strength Reduction Factor), to be included in thickness and other calculations. The factor is the same for all materials although the Code provides latitude in this regard if other data is available to the user.
Is anyone aware...
For the weld and HAZ of ASTM A-335 P91 material, ASME B31.3 recommends a maximum hardness of 241 BHN. However, NACE MR0103 appears to allow a maximum of 248 BHN for the base metal, weld, and HAZ.
For seamless fired heater tubes in hydrocarbon service, which contain circumferential welds...
Can anyone suggest a method or provide data for determining allowable compressive stress for a cylinder of specific geometry operating at a temperature above the limits in ASME Section II, Part D, Subpart 3?
The specific application would be a tall column constructed of SA-516-70 material...
What is the likelihood of type 304 stainless steel pressure equipment (pressure vessels, piping, fin fan header boxes, etc.) developing cracks from chlorides depositing on the external surface? The operating temperature may vary from equipment item to equipment item. One source of the...
Does anyone know approximately what year roll-bonded plate (specifically CS/410 SS) was commercially available? The only information that I have is that ASTM A-263 was first published in 1943. Based solely on poor documentation we are trying to determine if a particular vessel constructed in...
Gasket manufacturers do not recommend reusing metallic gaskets such as sprial wound, CMGC, RTJ, and double jacketed types since the metal components are typcially yielded during assembly.
However, can anyone cite good operating experience reusing gaskets of any of these types and can you...
Does anyone have any guidelines or calculation methods for external pressure or vacuum design of piping system? The concern is not straight lengths of pipe which can be analayzed using the methods of Sec. VIII, Div. 1, UG-28 but rather the concern is a typical piping system which includes 90...
Forgings produced to ASTM A-182 Gr F22 are normalized at a temperature of 1650F followed by a tempering at 1250F. Welded piping components then receive PWHT between 1300F and 1400F, as per ASME B31.3.
I have been advised that for such components the tempering temperature should be raised...
Are there any concerns about laying stainless steel (types 304 and 316) piping systems directly on galvanized steel supports in a high humidity, US Gulf Coast facility? Some have expressed concerns about the possibility of somewhat severe galvanic corrosion occurring.
Does anyone have an opinion concerning the neccesity for magnetic flux leakage testing of fired heater tubes which in all respects comply with the standard requirements of ASTM A-335 Gr P91? The tubes (pipe) are nominal 6 inch diameter, Sch. 40 and were hydrotested at the mill to 2800 psi...
