I have a heat exchanger in a water loop fed from a storage tank to a pump where it is circulated through the tube side of an exchanger and back to the pump suction (drops from the loop to users as-required). The exchanger shell side has steam to heat the water. Although the water valves at the...
Does anyone know of a list of standard instrument datasheet/specification numbers or a number series?
One engineering company uses 17xxx series
MasterSpec is mainly for builders/architects and does not have a series for instruments/automation.
ISA has a list of datasheet forms but does not have...
Existing plant steam user (i.e. equipment) rated at 125 psig has a steam supply pressure reducing valve set at 90 psig and a relief valve set at 125 psig, sized for steam reducing valve failure. The existing boiler supplying the steam has a relief valve also set at 125 psig. It appears that...
A survey of an existing steam relief valve installation shows the 4" valve outlet connected to a 4" discharge line that connected to an 8" vent header to the roof. (There are other lines tied into the 8" vent header.) There is a 4" check valve in the 4" relief discharge line where it connects...
Outdoor, above ground, double wall tank for ethanol storage constructed per UL-142. Primary tank has conservation vent/flame arrester and emergency relief vent.
Re: the double wall secondary containment, if this is not sealed (like a dike) and opened to the atmosphere, is a flame arrester...
Section VIII, U-1 states:
"the following classes of vessels are not included in the scope of this Division..."
"(h) vessels having an internal or external operating pressure (see 3-2) not exceeding 15 psi (103 kPa) with no limitation on size [see UG-28(f)]"
For a code stamped vessel with a...
Steam header at 50 psig to the shell side of a heat exchanger with a design pressure of 150 psig. No other scenario for pressure in shell getting anywhere close to 150 psig. Is a relief valve required?
A vendor for a water softener package that includes a 300 Gal. vessel containing water (not heated) with a design pressure of 125 psig claims that a relief valve is not required per the ASME code. It appears from the ASME Code Section VIII, U-1 (c)(2)(f), that this is correct since this is...
