Does EN 13480 allow short-term pressure excursions similar to those allowed by ASME B31.3? Specifically, I’m referring paragraph 302.2.4 in ASME B31.3 which conditionally allows excursion up to 120% and 133% of design pressure, for a limited number of hours per occurrence and per year. This...
Does EN 13480 (process piping standard) allow short-term pressure excursions similar to those allowed by ASME B31.3? Specifically, i'm referring paragraph 302.2.4 in ASME B31.3 which conditionally allows excursion up to 120% and 133% of design pressure, for a limited number of hours per...
I've used Flarenet (Aspen Flare System Analyzer) off and on for many years, starting with v7.3. I'm now using v9.0. With each new release I find maddening bugs and quirks with this program. The pattern I've seen is that they fix some bugs and problems, and create new ones at the same rate. I'm...
I have a B31.1 steam header (nonboiler external piping) that is protected by multiple PSVs. This is a 600# system and the gap between the operating pressure and the PSV set pressure is low. So, I want to minimize the risk of popping the PSVs by setting them as high as possible. But when I look...
Low pressure API tanks seldom have installed spare vent devices (PVRV, ERV, VRV, etc). How does your company handle maintenance and inspections of these devices when there isn't an installed spare? Do you do all of this testing/inspection in-situ, without removing the device to the shop? Do you...
I thought there was an ASME Sec I requirement stating that the BFW pump must have enough head to maintain a flow even when the boiler is at its relief pressure. I recall this from a power plant project I did back in the 90's. A question came up today, related to BFW pump head requirements. I...
I've searched through the PED regulation (2014/68/EU) and I don't see any reference or discussion about equipment that was in service prior to PED. Are PED regulations retroactive?
It seems inconceivable to me that the answer would be yes. After all, most of today’s vessels and relief...
Do you know of any states that have pressure relief regulations that are more restrictive than ASME Sec VIII?
I'm aware that California code explicitly requires the use of a relief valve or rupture disk, and excludes the use of HIPS or UG-140 (protection by system design). That's due to...
In the past, I have thought OSHA 1910.106 only applied to storage tanks and pressure vessels which function as storage tanks(operate at < 15 psig).
Someone challenged that, saying that this OSHA reg applies to all pressure vessels which function as storage tanks, regardless of the operating...
All,
What is your experience in getting adequate design documentation for PSVs that are part of packaged or skid mounted equipment?
Are you successful in getting the documentation you asked for in the specifications?
Thanks,
Don
I've just become aware of the section in API 520 Pt1 (3.3.3.1.3) that allows higher built-up backpressure (higher than 10%) for cases where the overpressure is > 10%. It says that the built-up backpressure can be >10% provided that it doesn't exceed the allowable overpressure.
Technically...
My colleagues in Netherlands and Germany claim that they're not allowed to use standard pilot operated PSVs, unless they're fitted with triple-redundant pilots. Obviously, that a show-stopper!
I've referred them to the harmonized EU standards (ISO-4126-4 Pilot Operated Safety Valves) but they...
I'm looking for clear information stating the allowable accumulation for fire sizing in jurisdictions that are covered by PED.In the committee response copied below, they say that 10% accumulation isn't the rule for fire scenarios, but they don't give the allowable value.
Can anyone provide me...
For process equipment containing flammable liquified gases, no heavier than say propane or propylene, what is your assessment of the credibility of a pool fire:
A) Always credible.
B) Always not credible.
C) Case dependent, but typically credible.
D) Case dependent, but typically not credible.
What is your opinion on allowing a check valve between the protected vessel and the PSV, or between the PSV and the vessel to which the fluid is routed? I didn't see this addressed in API-521 or any other code or standard. If you're opposed to allowing check valves in the flow path, is this a...
What are the rules governing overpressure limits for ANSI and API pumps? Since they are not pressure vessels, are treated the same as piping from the perspective of overpressure protection?
