6" Sight Glass Spool, 6" Tall, Two 2" Ports and Thermocouple Port
ABOUT THIS PART
A 6 inch diameter by 6 inch tall 304L stainless spool with two 2 inch sight ports and a 1/4 inch thermocouple port, built in house in Bend, Oregon. $600.00.
SPECIFICATIONS
| Type | Sight glass spool, bare. Sight glasses NOT included |
|---|---|
| Built by | N.B. Oler, in house, Bend, Oregon |
| Drawing number | NB-SP-6-WLD-R1 |
| Tube diameter | 6.000 in |
| Tube wall | 0.109 in |
| Height | 6.000 in |
| Across the ferrule | 6.567 in |
| End connections | 6 in tri clamp ferrule, both ends |
| Sight ports | Two, 2 in on 56 mm ferrules, set at an angle |
| Thermocouple port | One, 1/4 in weld bore through, fitted as standard |
| Thermocouple probe | NOT included. Add a 1/4 in K type probe, 4 in length |
| Tube material | SA-249 TP304 |
| Ferrule material | SA-240 304 plate |
| Bore through material | SA-479 316 |
| Finish | Number 4 polish |
| Shell pressure envelope, calculated | -319.7 psi to 764.5 psi, which is -22.0 bar to 52.7 bar |
| Calculation basis | ASME UG-27 and UG-28, cylindrical shell, SA-240 304, S 19.7 ksi, 0.115 in wall, 5.78 in inside diameter, seamless pipe, joint efficiency 1.0 |
| Source of calculation | 3P Certz report ECR-250902-R0 |
| System design pressure | -14.7 psi to 250 psi, which is -1.0 bar to 17.2 bar |
| Margin at design pressure | 305 psi (21.0 bar) on vacuum, 514.5 psi (35.5 bar) on pressure |
| Governing limit once glazed | The sight glass, not the shell. Rayotek 300 psi (20.7 bar), MetaClamp 232 psi (16 bar) per Metaglas's published ratings. The 2 in sight glass also limits the whole system on vacuum at -1.0 bar (-15 psi) |
| System temperature | Vessel designed to 93 C (200 F), system operates to 50 C (122 F). The lowest applicable limit governs |
| Certification | Item 2 on Ontario CRN 0H24152.5, Technical Standards and Safety Authority, as part of the 6 in material column |
| Price | $600.00, spool only |
| Complete with two windows | Roughly double, depending on which glass you choose |
| Also needs | Two 2 in sight glasses, two 2 in gaskets, two 2 in high pressure clamps, two 6 in gaskets, two 6 in high pressure clamps, and a 4 in K type probe if you want temperature |
Sight glasses are not included. You are buying the bare spool, with the ports welded in and empty. A complete spool with two windows fitted runs roughly double this price.
What is in the box
- One 6 in by 6 in spool, 304L stainless, 0.109 in wall, number 4 polish, 6.567 in across the ferrule
- A 6 in tri clamp ferrule on each end
- Two 2 in sight ports on 56 mm ferrules, set at an angle so you look down into the flow rather than straight across it
- One 1/4 in weld bore through for a thermocouple, fitted on every 6 inch spool we build
- Materials as named in ECR-250902-R0: tube SA-249 TP304, ferrules SA-240 304 plate, bore through SA-479 316. Built to our drawing NB-SP-6-WLD-R1
The thermocouple port is included. The probe is not. It is a 1/4 inch K type, 4 inch length, sold separately.
Pressure, temperature and the CRN
| Shell envelope, calculated | -319.7 psi to 764.5 psi (-22.0 bar to 52.7 bar) |
| Calculation basis | ASME UG-27 and UG-28, SA-240 304, S 19.7 ksi, 0.115 in wall, 5.78 in inside diameter, seamless, joint efficiency 1.0 |
| Source | 3P Certz report ECR-250902-R0 |
| System design pressure | -14.7 psi to 250 psi (-1.0 bar to 17.2 bar), leaving 305 psi (21.0 bar) and 514.5 psi (35.5 bar) of margin |
| Fitted with a Rayotek window | 300 psi (20.7 bar) |
| Fitted with a MetaClamp window | 232 psi (16 bar), per Metaglas's published ratings |
| Vacuum in practice | -1.0 bar (-15 psi), set by the 2 in sight glass for the whole system. Metaglas publishes -1.0 bar for the MetaClamp and our report puts the Rayotek at -15 psi |
| Vessel design temperature | 93 °C (200 °F) |
| System operating temperature | 50 °C (122 °F) |
| Canada | Item 2 on Ontario CRN 0H24152.5, Technical Standards and Safety Authority, as part of our 6 in material column |
The shell is a real calculation rather than a catalog figure, and it is never the limit. Once windows are in, the glass governs. The lowest applicable limit always governs.
What you also need to finish the build
- Two 2 inch sight glasses, Rayotek or MetaClamp, both borosilicate in 2205 duplex
- Two 2 inch gaskets, Viton or PTFE envelope
- Two 2 inch high pressure clamps, to hold the windows in
- Two 6 inch gaskets and two 6 inch high pressure clamps, to put the spool into your column
- One 1/4 inch K type thermocouple probe, 4 inch, if you want temperature
Fits any 6 inch tri clamp column or collection vessel. We build a 4 inch version too. There is no 8 inch.
Service
- Inspect the windows every time the spool is apart, and replace any that are chipped, cracked or scratched rather than running them
- Gaskets are consumable. Keep spares for both the 2 inch and the 6 inch joints
- Our operators manual has you observe the oil through the sight glasses before opening a collection valve, and this is the part that makes that possible
Built in house in Bend, Oregon.
| FITS | Fits any 6 inch tri clamp column or collection vessel. Used on N.B. Oler hydrocarbon systems in the material column and the collection vessel, and registered as item 2 on Ontario CRN 0H24152.5 as part of the 6 inch material column. Takes two 2 inch sight windows, Rayotek at 300 psi (20.7 bar) or MetaClamp at 232 psi (16 bar) per Metaglas's published ratings, and one 1/4 inch K type thermocouple probe in a 4 inch length. Sight glasses, gaskets, clamps and probe are all sold separately. |
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▦ IN YOUR MANUAL
This part appears in the operator manual that ships with your system. The QR code there links to this page.
COMMON QUESTIONS
Does it come with sight glasses?
No. You are buying the bare spool. The two 2 inch ports and the thermocouple port are welded in and empty. A complete spool with two windows fitted runs roughly double this price.
What do I need to buy with it?
Two 2 inch sight glasses, two 2 inch gaskets, two 2 inch high pressure clamps, two 6 inch gaskets and two 6 inch high pressure clamps to mount the spool, and a 1/4 inch K type probe in 4 inch if you want temperature.
The title mentions a thermocouple. Is one included?
The thermocouple PORT is included, a 1/4 inch weld bore through, fitted on every 6 inch spool we build. The probe itself is a separate part and is not in the box.
What pressure is it good for?
The shell calculates to 764.5 psi (52.7 bar) and -319.7 psi (-22.0 bar) under ASME UG-27 and UG-28, from 3P Certz report ECR-250902-R0. That is the bare spool. Once you fit windows the glass governs, at 300 psi (20.7 bar) for the Rayotek or 232 psi (16 bar) for the MetaClamp, the latter from Metaglas's own published ratings. The lowest applicable limit always governs.
Can I pull vacuum through it?
The shell goes to -319.7 psi (-22.0 bar), but the 2 inch sight glass limits the whole system to -1.0 bar (-15 psi), so that is your real number. Metaglas publishes -1.0 bar for the MetaClamp and our report puts the Rayotek at -15 psi.
What is it made of?
304 stainless throughout. Tube is SA-249 TP304, ferrules are SA-240 304 plate, the thermocouple bore through is SA-479 316. Number 4 polish.
Is it certified?
It is item 2 on the bill of materials of Ontario CRN 0H24152.5, registered with the Technical Standards and Safety Authority, as part of our 6 inch material column.
Why are the sight ports at an angle?
So you can see down into the flow rather than straight across it, which is what you want when you are judging color and whether solvent is still coming off.
Which sight glass should I use?
Either, and we fit both. They are not identical on paper. Metaglas publishes 232 psi (16 bar) and -22 F to 536 F, which is -30 C to 280 C, for the 2 inch MetaClamp. Rayotek publishes 300 psi (20.7 bar) and -40 F to 572 F, which is -40 C to 300 C, and the Rayotek is the one named by part number in ECR-250902-R0. The MetaClamp is usually the one on the shelf. If you are certifying or matching an as built, confirm the window with your own certifier.
What size thermocouple probe?
1/4 inch K type, 4 inch length. That is the standard on every N.B. Oler sight spool.
Do you make an 8 inch version?
No. Four inch and six inch only.
How tall is it?
6.000 inches, and 6.567 inches across the ferrule.