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Once the flanges contact each other, where do you think the bolt load will go? You will be essentially increase the tensile load on the bolt and a compressive load on the flanges without transferring any load to the gasket.

There are two parts to the gasket loading/stress - seating and operating. The gasket will relax approx 15% in operation and will require to account for the bolt stress/load/torque. There is also the question of the mating flange stresses. if you are connecting a ductile control valve flange to a...

OP, The socket welding is a pressure retaining weld. You need to qualify the WPS using grove-weld test coupons. Quote QW-202.1(c): These qualifications may be used for welding all thicknesses of base metal for all sizes of fillet welds, and all diameters of pipe or tube in accordance with...

Attachment welds are almost always done in a piping system. All you need is to develop and qualify a WPS complying to the Code requirement.

That's correct. It looks OP never opened the Standard A999 and looked into Para 12. GBT had provided all info except Table 1, which is the variance table for OD. To get it started in a right note, NPS 812,8 mm is not correct. NPS is a unitless number and most likely he means NPS 32. (DN 800 ).

OP, Don't expect the fitting manufacturer to be a Code Designer. You will need to specify the wall thickness of the reducer while ordering. The wall thickness (which is essentially rating) of the reducer is based on a seamless straight pipe of equivalent material. For the calculation, the pipe...

Hi FlashPurp, Load carrying capacity for trunnion/dummy supports must be checked for local piping loads/stresses (longitudinal, circumferential and axial loads and the corresponding moments) to be below the allowable stresses. A repad will increase the load carrying capacity (reduce the...

OP, You are all over the place. Why bring API 1104 with ASME B31.3? API 1104 is meant for Pipelines and Facilities (pumping/compressor Stations), whereas ASME B31.3 is for processing facilities and follows ASME Sec IX. So, first thing first. Keep your steer and focus straight on what you want...

OP, Why one needs to weld the pipe to its support? There are hundreds of pipe supports that can be clamped, strapped, U-bolted, supported on shoes. There is no repad concept in pipe supports. Repads are considered only where pipe intersects (branching) or vessel intersections (nozzle, manway...

OP, This is an interesting question. Following is my take: All Standards all have the same basic purpose of setting out agreed principles or criteria so that the users can make reliable assumptions about the product, service or practice. However, they can vary in two major respects: the type of...

OP, Low temperature doesn't mean it has to be cryogenic. What is the MDMT of your flare line? Did you figure out if an impact test required from Fig 323.2.2A? Or is it only the study at this time you are trying to understand the Code? Before you come back with the answer, one needs to be...

OP, First explain, how will you open a stuck 1/2" drain valve on a cold line?

Unlike piping codes ASME B31.1/31.3, B31.8 don't consider corrosion allowance (CA) in it's thickness equation. Instead, the following preventive one or more measures are taken to protect the pipeline against internal corrosion: Internal protective coating, Use of corrosion inhibitor Use of...

I agree with Steve Jones. Remove SAW from the PMS. It's superfluous/ambiguous. Keeping material specification/Standard ASTM A333 alone is good enough to keep the material complying to the Standard.

OP, SJones is right. Sorry, I directed you the wrong way. Unfortunately, there is no guidance so far in Pipeline Codes on girth weld including notch toughness requirement. API 1104 provides WPS qualification for general welding but don't provide any guidance on notch toughness. The only place...

OP, 1st Part: Littleinch has taken you in the right path. Just as a refresher Location Factors are in whole nos (1,2,3,4) and Design Factors in decimals (0.4, 0.5, 0.6 etc). I am not sure how it works where the facility is located but in many countries, the design is registered with the local...

It's bizarre. only 6 months life out of a replaced pipe. It's like something is scooping the material out. It's for sure corrosion (pitting) and erosion (the grooving) the culprit. It's a high pressure water injection line. Check the velocity and the pipe alignment. Is it something a sag in that...

OP, when t>D/6, we are essentially talking about thick wall pipe. Piping, even pressure vessel Codes always draws a line between thin and thick wall definitions. The reason for it is the stress distribution across the wall. ASME B31.3 Equation (3a) is an empirical approximation of more accurate...

OP, Fracture toughness of material is dependent on material strength, stress/press and temperature. Para 814.1.2 provides the criteria for impact testing. Only one condition (not all three (a)(1)(2)(3)) need to be met to kick off the impact testing. For example, if the pipe diameter is equal or...

OP, That is always the case. The thickness equations in B31.3 Chapter IX and Div 1 MA1 are more accurate in terms of stress distribution across the wall. The answer really lies in the stress tables (example Table A1-M Vs Table K1-M). The basic allowable stress, S, for the A106 Gr B pipe is 20...