Is the only difference between NPTF Class 1 and NPTF Class 2 the inspection requirement of the crest and root truncation? Can NPTF Class 2 and NPTF Class 1 threads be used together without concern for leakage?
Is there a standard sampling practice for manually sampling hydraulic fluids? ASTM D4057-12 has been recommended to me but paragraph 1.4, of that standard, explicitly states that it does not cover hydraulic fluids.
Thank you for any help you can provide.
There are companies advertising fittings as A234 - Gr 4130. It doesn't appear that any of the A234 grades listed in table 1, of the ASTM specification, have the chemical composition range to allow 4130. How are they doing this?
Does B31.3 permit the designer to specify a weld metal that results in a lower tensile/yield strength than that of the unlisted base metal it is joining? The PQR uses A519-4130 joined with E10018-D2 MR. The tensile/yield results for the test specimens are lower than that listed in the ASTM...
The MTR for a piece of A519-4130 (SR) we received lists its tensile strength at 104 ksi and yield strength at 88.5 ksi. Table S2, of ASTM A519-06, lists the A519-4130 (SR) with tensile and yield as 105 ksi and 85 ksi, respectively. Is there an allowable variance in the ASTM tensile strength?
I am trying to locate two-piece bleeder screws, like the one in the attachment. The assembly consists of an outer bushing with a bleeder screw that screws into it. The bushing has -4 SAE threads and appears to be a 37 degree JIC fitting with an O-ring. The bleeder screw is 1/4” with 1/4 – 28...
We are experiencing differences in the weldability and weld quality between two different sizes of 4130 pipe. The welding procedure requires a 400F preheat with 650F max interpass temp. The root is E6010 with E10018-D2 H4R for fill and cap. Welds made in the NPS 2 pipe were as expected but NPS 4...
According to 6.3.4.3 Heat Treat Condition, testing shall be done with the test weldment in the PWHT condition. Does this requirement apply to the WPQ as well as the PQR? Do the WPQ require impact testing?
My question is in regards to B31.3, paragraph 304.7.2 "(a) extensive, successful service experience under comparable conditions with similarly proportioned components of the same or like material." We have used A234 WPB fittings on a system for many years. We plan to create a similar design...
Are there specific API codes that apply to the fabrication and inspection of the high pressure mud line used to carry drilling fluid down hole and the choke line used for well control?
Thank you
I am reviewing PQRs and WPSs for BPVC and am trying to understand how the range used for the size of filler metals (QW-404) is determined. For example, the electrode used for the PQR was 3/32" and the range given on the WPS is 3/32" to 5/32". The test coupon thickness is .432" with a maximum...
