Our customer has asked us to re-tube their GE steam turbine condenser, replacing the original 2134 1" OD x .049" (18 BWG) Admiralty D Brass tubes with 1" OD 304 Stainless tubes. There is a section of 304 tubes originally installed as a separate cooling section in this unit that uses 1" OD x...
We are designing 2 seperate Section VIII-1 DA tanks. The 1st is horizontal at 8'6" OD x 24' with F&D heads. The 2nd is vertical at 8'0" OD x 16'4" with F&D heads. All shell and head material is 1/2" SA 516-70 and is exempt from CVN testing per UG-20(f), UCS Curve B.
Our calculations show fiber...
A client has a question I cannot answer. Not a big surprise there. A 1950's era Wickes coal fired 475# MAWP power boiler has five PRV's. This typical 1 of 6 is on a US Army Base in Alaska. One on the SPHT at 475# is normal. The remaining are located across the top of the Steam Drum. These are...
ASME Sections I, IV and VIII-1 all have brief specifications for tube expanding. Common is the 1/32" clearance between tube OD and tube-hole ID (see HG 360.2). This is the common .031" clearance we see in new construction. Rarely, during a repair do we find this hole size on firetube boilers...
In an 80 ft. diam tank we are installing a heating coil. Can a standoff be welded with fillet welds to the A516-70 annular plate, without performing MT. What NDE would be required? The plate stands will be 4" from the shell (beyond the critical zone). The tank is designed for minus 60 deg. F but...
The design for a 102 foot diam. open top tank with fltg roof does not require an annular plate. Due to construction of a new concrete foundation, an annular ring type design of A 516-70 is used to allow use of A 36 floor plates. The junctions of the annular ring will be a combination of single...
Does API 650 and 653 allow a qualified tank engineer to design a weld joint on a new replacement floor closer than 12" from the shell, per Par 5.1.5.4? ASME allows some engineering design changes if properly supported, Does API?.
A customer has requested the welding of a 3/4" threaded nipple into an SA 105 Sec. VIII-1 coupling nozzle. I seem to remember a Code provision that allowed this if all of exposed threads were "consumed" in the fillet weld. Where might I find this provision.
Why does the B31.1 limit S/O flanges to NPS 4 and Class 300 per Par(s) 104.5.1(A), 122.1.1 (F) and Fig 127.4.4(B)? Can or should one design around this restriction?
B31.1 Table A-2 lists SA 194 Grades 3,4 & 7. The referenced note (10) describes temperature limits for only Grades 3 & 4. What can we assume for Grade 7. We are designing for 825F. I have looked back 10 years and the note is the same. Is it ever appropriate to assume a "mistaken omission"?
We are repairing a tubular airheater in a stoker coal fired power boiler. Expected exhaust gas temperature at under 450 deg. F. Scheduling has forced us to look at available practical material options. What is the effect of a change from 2" OD x.083"T to 2" OD x .095"T on...
