We are treating 650 gpm of well water to reduce hydrogen sulfide odor. Immediately after aeration (bubble-tray type), we are seeing a feathery, white "floc" that resembles surface water treatment floc, however there are no coagulants added to this feedwater. Only aeration, no chemicals, not...
I'm looking for any guidelines for sizing a horizontal hydropneumatic pressure vessel for controlling the ON/OFF operation of a 1,000 gpm well pump. The hydropneumatic tank controller will turn ON the well at 40 psi and OFF at 60 psi. How do I determine the minimum volume of water that the...
We have an existing ASME U-stamped vessel in the field and the 24" hinged manway needs to be replaced due to corrosion on the sealing surfaces between the ring and hinged cover. The manway ring protudes approximately 4" from the exterior of the vessel. Can we cut off 1" of the top portion of...
Our company currently has an order to supply a control panel to operate two electric valves on a filter system. The process logic is controlled by the Allen-Bradley Pico GFX programmable relay. The company that built the panel for us, initially thought they could program it for us, but when...
I saw a an ASME label with the U-stamp welded to the removable manway cover on an un-fired pressure vessel (not supplied by my company). It seems to me that the label should have been attached to the vessel head or shell, since the cover could be removed and placed on another vessel. If this...
Regarding pressure vessels intended to be designed per ASME Code Section VIII, Division 1, I have seen calculations produced by various fabricators that included static pressure and some that do not. Which is correct?
S. Bush
www.water-eg.com
Does anyone have direct experience with applications involving marine grade aluminum coming into contact with liquid brine (23 - 26% NaCL) on a continuous basis at ambient temperatures?
My particular application involves 10 - 12 foot diameter, 8,000 - 12,000 gallons, flat bottom, dome top...
I've noticed that most fire protection systems use grooved pipe and fittings that I've always refered to as "Victaulic" (even though I'm sure there are other brands).
Two questions: 1. Why is this so common in fire protection? 2. Why isn't it used more throughout the piping industry in...
Can the working pressure of an ASME code pressure vessel with U-stamp be upgraded (re-rated) from 75 psi to 100 psi? Perhaps by incorporating radiography? Has anyone ever encountered a request like this?
These vessels are currently operating at a water treatment plant in New Jersey and were...
Can someone direct me to a pre-engineered chart of sizes and spacings for pipe legs for vertical, carbon steel pressure vessels (no seismic or wind load consideration)?
For years, we've been using a sizing recommendation chart produced by the CPI. It covers vessels from 24" to 144" diameter...
I understand that Inside Paint System No. 7 (Metallic Sprayed Zinc Coating System) was removed from the current AWWA D102 (Painting Steel Water-Storage Tanks) Standard because the AWWA is developing a new standard for this and other similar coatings.
Does anyone know if this new standard is...
Can anyone recommend a coating system for painting the interior of pressure vessels for hot water service at 160 - 220 deg. F. Our normal supplier (Tnemec) doesn't have a product that will go up to 220 deg. We can do baked coatings, but would prefer not to if air-dried is available. We can...
Can anyone recommend an air-dryed coating system for painting the interior of carbon steel pressure vessels for hot water service at 160 - 220 degrees F. Our normal paint supplier (Tnemec) doesn't have a product that can reach the 220 deg. limit. We have an oven, but would prefer not to use it...
Can anyone direct me to a supplier of welding spuds. I am looking for a 1" NPT size in stainless. This is not for tank penetration. I have not used these before but I have seen them. They appear to look like a half coupling with a flange around the girth for welding to a flat surface. Any...
I am looking for a recommendation on process control valves.
I am designing new pressure vessels with automatic control valves for a condensate (180-deg. F) polishing water treatment. The existing equipment (15+ years service) has y-pattern globe valves (cast iron body) with air-powered...
Can anyone provide the names of any competitive American or Canadian head suppliers for mild steel up to 1" thickness and 48" to 144" diameter. Most of the heads we use come from Trinity/Brighton.
S. Bush
www.water-eg.com
Is there any rule or guideline for locating horizontal vessel support saddles? I am refering specifically to the distance from the weld line or tangent line of one head to the center line of the corresponding support saddle. Our vessels are typically 96" to 120" diameter by 16' to 32' in side...
One of our clients has a large commerical pool with a perimeter gutter system constructed of Type 304L stainless steel. After about five weeks of operation, they discovered a black residue, similar to carbon black but not grainy, only on one end of the pool, and only on the face of the...
