Our company manufactures Magnetic Level Gauges to order. We are registering this product line with CSA (CRN number) as being built under ASME B31.3 We are seeking to conform to the Examination Requirements of Ch. VI of Asme B31.3 before I get the ASME Inspector out here to certify our QC...
yes to both questions...the Qualified Welder offered the fusion weld as an alternative once he realized that this issue was coming to a head. His issue has to do with speed and fixturing. Our volume is not high enough to justify GMAW so we TIG. We are welding stainless steel. To do a full...
Yes, they are simply setting the weld cap on the pipe and filling the groove with weld metal. An alternative is offered wherein the welder fuses the lands together then makes filler passes over the fused lands. This seems better, is it acceptable?
The company I work for builds instrumentation for the oil & gas industry. The pressure containing parts of one of the products is built to B31.3 They are welding a 2-1/2" s/10 weld cap to S/10 pipe (316/316L). But instead of holding the root gap open and full pen. welding, they lay the cap...
I am designing a product which will be using a diaphragm. It needs to be PTFE coated EPDM. The supplier sent back samples bonded with an acrylic-based double-coated film. These diaphragms peeled right apart. I believe there is a better way to bond PTFE to EPDM. I have heard that the best way...
I am calculating a branch connection of 2" pipe into 2-1/2" using ASME B31.3. The criteria for determining the amount of reinforcemnet area is directly related to the amount of material removed from the header. The amount of material removed from the header pipe is usually the same diameter as...
The company I work for makes instrumentation for the petrochemical and oil & gas industry. The standard we conform to is ASME B31.3 (not BPV!) I am in the process of back checking legacy designs to see if they, in fact, conform to this standard. One of the products they make requires a 3/16"...
Thank you all for your help. metengr, stanweld, I am not using the MTR values for anything except to verify that the pipe was rated to the higher tensile strength. The allowable stress from Table A1 of B31.3 is the applicable value. It's just that the difference between the allowable for 316L...
Whenever we receive pipe & fittings dual rated as "316/316L", for example, does that ALWAYS mean that the allowable stress will be the HIGHER rating of the two? The pipe distributor said it's true & I looked at a few MTR's and the mechanical test Tensile Strength & Yield Strength were the...
I am designing a product using U-cups in a double-acting piston seal. The piston diameter is 1.5625" and the pressure on the face of the piston is about 3 psig. The only force activating the piston is the 3 psig on the face. The device is operating in SAE 30 oil so there is enough...
vanstoja: Thank you for bringing up an issue I had not thought of - partially filled liquid lines. I will take your information and digest it and get back with you.
BenThayer: Thank you for the maximum flow Rules of Thumb but I am actually concerned with minimum velocities. If you can...
Thank you for your replies. JStephen, I'm developing a chemical injector so it might be used in any application we can show that it works in. DrillerNIc, there is no problem with turbulent flow, that has plenty of excess kinetic energy. It's at the lowest end of the flow regime that we reach...
I am designing a device that uses the energy from the flow velocity in a pipeline to function. So I need the forum members to tell me what you use as the minimum practical pipeline flow velocity. This device may be used in mainline and plant environments so I would like the full range. So far...
It sounds like you are saying that the corrosion due to chemical attack cannot be mitigated by directing it toward the anodic material. The two types of corrosion are not interrelated. That is, corrosion due to chemical attack is not related to galvanic corrosion.
I have designed a device which has an Inconel X750 spring within a large 316 SS body. The Inconel is passivated so its corrosion potential is -0.3, the 316 SS (active) has a potential of -0.79. The spring material is only 0.025" thick. The SS body is a piece of 1 1/2" thick bar stock with a...
