The exchanger is an ASME shell & tube. If the water inlet & outlet valves at the exchanger were not locked open, there is no issue. A thermal relief valve would be added between the valve and exchanger. The question here is that there is a long loop with valves not located at the exchanger...
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...
Thanks controlnovice!
I had the 2004 version and this 2011 version has been greatly expanded. Section 40 90 00 looks like what I'm after. I'll have to look at it in more detail.
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...
Thanks for your reply zdas04!
The existing equipment would still have a relief valve regardless, but since the plant steam source is not capable of overpressurizing the existing equipment by virtue of the boiler relief valve, why can't the scenario of plant steam supply overpressure be negated...
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...
Wow! I have to say that I didn’t expect the response so far to my original question. I thank you all for taking the time to read the question and respond! It has been very enlightening.
I’ve been an Instrumentation/Automation Engineer now for over 30 years now and was originally schooled...
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...
Sorry, in trying to be brief, I intentionally left out some details. The steam is generated at 105 psig with relief at 125 psig. After reducing to 50 psig, there is another relief valve. Therefore, the steam to the exchanger will never be close to 150 psig. The tube side is also rated at 150...
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...
