All,
i've recently come of a project in asia where we installed flame arrestors on tanks with atomspheric vents on materials with a flash point of 0-10 C. I'm fairly certain this was a local code requirement. I am now working on an older site and the tank vents of similar flash point dont have...
All, we have a storage tank containing fluid of an SG of 0.7. We are installing a larger tank onto site. I'm told it works if we reduce the design margin on the codes from 1.5 to 1.2.
I'd like some candit coments from engineers on your perspetive of this change. We dont process any fluids...
Does anyone know of a steam seperator supplier that will allow a unit with a flanged drain? rather than a screwed fitting..
we want to use a unit for a liquid knock out but on a process service..
e.g. as a knock out drum..
but we need flanges for our 300 lb pipe spec on all connections,.,.
Dear Conserned Relief experts:
For various reasons we purchase ASME relief valve but we actually work in API on our site. I've no experience in ASME rating but our supply vendor uses ASME calculations.
I am curious: For ASME: Does a rating document exsit - eg.g that gives you a basis for...
On inlet loss calculations do you include the Bursting disc in the pressure drop before the valve...or
do you down rate the valve capacity and exclude it..
Dear sirs,
I am struggling to understand how to calculate this. If you can recommend a reference please let me know.
We have Steam generate generated at 100psig. The density of steam at 0.27 m3/kg(approx). but water at 100psig proir to boiling is 909 kg/m3 (approx). Does the rate of steam...
Dear sirs,
We are upgrading our steam seperators/demisters to prevent wet steam. A contact company has suggested installing steam quality meters...to measure wet fraction (i think)
Has anyone had any success with these meters and their prespective on how effective they are?
(i've repeated...
Dear sirs,
We are upgrading our steam seperators/demisters to prevent wet steam. A contact company has suggested installing steam quality meters...to measure wet fraction (i think)
Has anyone had any success with these meters and their prespective on how effective they are?
(i've repeated...
Dear Sirs/expert peoples...
I am looking some useful references which describe typical standards used for generated steam in non-fired boilers..
specifically,
> Acceptable levels of wetness???(0.1% 0.5% to avoid corrision errosion)
> typical system setups?
ie superheat or just demister...
Dear sirs,
I've read the comment on spirax's web site that the rate of change on a kettle type re-generator can cuase wet steam.
I'm having a hard time visualising this??? i would have thought that the overall rate is what impacts the capacity as most have a seperator device on the outlet...
Dear sirs,
I'm looking for some references here. I am investigating a steam generator which is subject to rapid changes in steam generation rates. I'd like to understand what is the best technlogy to evaluate to manage these rates of change such that they done create wet steam and what are...
Dear All,
I am after some general advice on or pointers to usefull articles or background reading on which valves/pumps are normally selected by the "shutdown systems" plant shutdown button.
So far in our process hazard review we have worked through our percivable senerios and installed...
Dear sirs,
I am interested in peoples advice here as to if we have a situation to be concerned about.
We have a column which is apparently started up "sometimes" so the operators tell me. That they leave the steam onto the reboiler when the level transmitter reads zero level. I have always...
Dear Sirs,
I am completing a project which defines column operation via a simulator we have been asked to describe how the column trays loss level from weeping point to zero flow. The trays are muti pass sieve trays. Say the weep point is 50% of design would I expect a straight line of loss...
Dear All,
I have uncovered some relief case designs on some installations which the vapour rate exceeds the packing flood rate for the column. The relief valves are located on the vapour overhead line.
I've been on the Kister distillation course (a long time ago mind) he recommends that...
Dear sirs,
On our site we had "for years and years !!" this policy of painting all our pipe rack pipes green as for process. We are considering a system of using colours for high hazard lines to aid ID issues quickly if we have a leak.
I am curious on peoples views on how effective they...
Dear Sirs,
I have found out that a supply which sends a C7 hydrocarbon to us ocassionally. Does not normally inert tankers the safety case is based on the LEL/UEL C7 is very narrow and the vapour pressure at atm pressure would not be in the flammable range. Talking with the distriubtor this...
Dear All,
When you vent down equipment either during process preps at the end of pressure cycles or on a re-start after shutdowns do you vent the "NITROGEN" into the open plant areas. IE FOR OUTSIDE BUILDINGS.
Take the case, Column has just been pressure tested to 6 barg nitrogen we now...
Hi all,
I'm posting this for general advice here. I am leading a major re-tray project on site. We are installing over 150+ new trays on two columns in a few days. The columns have very close tray spacing. Ie inspection and walkthrough once built is very difficult.
We are planning on...
Dear Sirs,
I am investigating VOC reduction at our site to meet new legisation requirements. One of our difficulties is several of the monomers sublime - at 20-60 deg C just before they sublime they have reliative high vle concentrations (20000 ppm or more).
This would suggest to me that a...
