The common carbon steel gate/globe/check valves with metal to metal seats use different materials for trim & provide longer life for shut off. Small amount of corrosion or erosion of body does not result in leak failure, but small amount of corrosion in seat area results in leak-thru that could...
JrValveEng,
The ASME B31.1 Power Plant Piping code material allowable strength had a 4:1 design factor for decades, until it was recently 'reduced' to a more economical 3.5 :1 design factor that is consistent with the same design factor in ASME Section I Fired Pressure Vessels.
The B31 Code...
quizzical1,
Check with General MagnaPlate for their NEDOX coating. They have other systems that might be adequate instaed of the premium NEDOX coating.
adt10,
Many LPG loading stations use Blackmer or Corken pumps. Check for their recommended piping and recirculation configurations.
There are a number of emergency shutdown valve, back check valve, excess flow valves, and remote trip valves offered by Fisher Controls -Regulators Division, and...
apark19,
Shipboard water desalination systems have ductile iron piping as entry level material of construction, while nuclear submarine water desalination systems use titanium - a wide extreme indeed.
The older power plants at coastal locations had ductile / cast iron used for seawater cooling...
bmehank,
There is some loss of steam through the thermostatic air vents at the radiators. Assuming that there are air vents on the radiators, consider the following.
"Steam pressure is less than 1 psi at radiator inlets." would result in partial vacuum in radiator during cycle 'off' when...
ak1965,
You could have more concern for the weldolet A105 material at 400 deg C service. Perhaps a weldolet of material to ASTM A182 Gr F11 would be more suitable and compatible to the A213 P11 piping.
The observations of metengr are good, and while many hot tap operations are performed...
Redmar,
A marketing guy asked Engineering why they did not have a standard design plant to offer to clients.
Engineering replied that they would make a standard design plant, once Marketing had found a standard customer.
colar,
The rationale for Category D fluid services would be based on nonhazardous substances at moderate conditions of the pressure less than 150 psig and temeperature less than 400 deg F. The typical nonhazardous substances would be air, water, nitrogen, and steam less that 150 psig...
david6245,
The inverted bucket traps could operate on higher pressures with the smaller orifices. The IB mechanism has weight to pull the valve open away from the orifice seat. Larger sized orifices of IB traps have less ability to open the valve against the steam pressure. So it would be...
claimslitigation,
There are now a number of state and municipal codes available free, including California and cities, at
http://bulk.resource.org/codes.gov/ca.local/
You may find it useful to retain a licensed plumber that is familiar in the local plumbing code, as an expert witness...
nichols 7007,
ASME B31.3 (b) 1. states,
" Not less than 5% of circumferential butt and
miter groove welds shall be examined fully by random
radiography in accordance with para. 344.5 or by random
ultrasonic examination in accordance with para.
344.6. The welds to be examined shall be selected...
JAYDEE23,
The B31 allowable stesses for the materials in Table A-1 thru A-7 have been established for 7,000 cyclces based on a daily start / shutdown for approximately 20 years. If there is more frequent thermal or pressure cycling, then the designer would need to evaluate and apply factors to...
jrupert24,
The seeming loss of nickel would be a puzzle. A comparison of melting / boiling points might shed some understanding.
Nickel Ni 1455 deg C melting, 2730 deg C boiling,
Iron Fe 1539 deg C melting, 2740 deg C boiling,
Chromium Cr 1890 deg C melting, 2500 deg C...
