McMaster Carr CMF orifices and filters

Tom Rose · 24th February 2007, 12:18

Quote: (Originally Posted by marekm)

To interested parties, here is the order as it stands on the 25/2/07. Unless there are anymore changes to the order, I’m going to contact Tom on Monday and to arrange payment.

MAREKM
1X 3820K11 US$8.04 ulsation-Damping Snubber Brass, 1/8" NPT, .004" Orifice, 2000 PSI

1X 3820K41 US$17.09 Pulsation-Damping Snubber Type 303 SS, 1/8" NPT, .004" Orifice, 4000 PSI

1X 4034K62 US$7.98 Pulsation-Damping Snubber with Filtering Disc Brass, 1/8" NPT Connections, 40 to 45 Micron, 3000 PSI

1X 4034K66 US$10.16 Pulsation-Damping Snubber with Filtering Disc 303 SS, 1/8" NPT Connections, 40-45 Micron, 5000 PSI

2X 44555K131 US$1.38 Brass Double-Barbed Vacuum Tube Fitting Barbed X NPT Male for 1/4" Tube ID, 1/8" NPT

1X 50745K16 US$7.88 Hi-Pressure Brass Single-Barbed Tube Fitting Barbed X NPT Male for 1/8" Tube ID, 1/8" NPT

CORALLARO
1X 3820K11 US$8.04 Pulsation-Damping Snubber Brass, 1/8" NPT, .004" Orifice, 2000 PSI

1X 4034K61 US$7.98 Pulsation-Damping Snubber with Filtering Disc Brass, 1/8" NPT Connections, 10 Micron, 3000 PSI

(Corallaro, if you can try out the brass 10 micron filter, I will test the 45 micron filters).

TOTAL: US$69.93

I have noticed that you went with 1/8 NPT....do you have access to 1/8" NPT to low pressure port adapters? If so no problem....just do not want you to go down a dead end.....

Tom

**Dave Sutton** · 24th February 2007, 12:45

Quote: (Originally Posted by Tom Rose)

I have noticed that you went with 1/8 NPT....do you have access to 1/8" NPT to low pressure port adapters? If so no problem....just do not want you to go down a dead end.....
Tom

No need to worry, as best way probably isn't hard plumbing to the first stage.

My suggestion has always been to stick with 1/8 NPT and then use female NPT to barb fittings. Screw one on each side of the orifice and then cut any old LP hose and stick the barbed assembly in the middle. Makes it streamlined and there is no clump of metal hard plumbed to the regulator to get broken off. Flexible = good.

Dave

marekm · 24th February 2007, 13:47

Quote: (Originally Posted by Dave Sutton)

No need to worry, as best way probably isn't hard plumbing to the first stage.

My suggestion has always been to stick with 1/8 NPT and then use female NPT to barb fittings. Screw one on each side of the orifice and then cut any old LP hose and stick the barbed assembly in the middle. Makes it streamlined and there is no clump of metal hard plumbed to the regulator to get broken off. Flexible = good.

Dave

That is exactly what I was going to do. Plus I can machine 1/8 NPT adaptors as required. But I'm still going with the flexible solution since I have short LP hose offcuts (with 3/8UNF fittings) left over from setting up my twinset.

However, can you tell me why you would install a shutt-off valve before the orifice as some people have done? Or is it easier to just turn off valve on the O2 tank.

Thanks in advance.
-Marek

bletso · 24th February 2007, 22:28

Quote: (Originally Posted by marekm)

Hi everyone,

1. What diameter orifice do I need for a 0L/min to 1L/min flow rate.

-Marek

Try this formula

Flow through a sonic orifice

Flow (lpm) = 11Pbar * D2

P = pressure in bars

D = diameter in mm

I can't remember where I found it, but it is simple and works well.

Dale

**Dave Sutton** · 25th February 2007, 00:42

Quote: (Originally Posted by marekm)

That is exactly what I was going to do. Plus I can machine 1/8 NPT adaptors as required. But I'm still going with the flexible solution since I have short LP hose offcuts (with 3/8UNF fittings) left over from setting up my twinset.

However, can you tell me why you would install a shutt-off valve before the orifice as some people have done? Or is it easier to just turn off valve on the O2 tank.

Thanks in advance.
-Marek

You place a shut off so you are not free-flowing 02 when you are dressing and undressing into the rig, and so you can shut down the flow if the PP02 goes high (maybe sitting taking a photo if the flow is a little high). It just makes the rig easier to manage. Use the McMaster-Carr 18 NPT valve I gave the number of before and screw the orifice directly to the valve and place it where it is easy to reach. This is just easier than getting to the cylinder valve while sitting on the bench, that's all.

Dave

marekm · 26th February 2007, 13:22

Hi Tom,

Here is the final order for McMaster Carr. I'll PM you my details so we can get this order sorted out.

MAREKM
1X 3820K11 US$8.04 ulsation-Damping Snubber Brass, 1/8" NPT, .004" Orifice, 2000 PSI

1X 3820K41 US$17.09 Pulsation-Damping Snubber Type 303 SS, 1/8" NPT, .004" Orifice, 4000 PSI

1X 4034K62 US$7.98 Pulsation-Damping Snubber with Filtering Disc Brass, 1/8" NPT Connections, 40 to 45 Micron, 3000 PSI

1X 4034K66 US$10.16 Pulsation-Damping Snubber with Filtering Disc 303 SS, 1/8" NPT Connections, 40-45 Micron, 5000 PSI

1X 44555K131 US$1.38 Brass Double-Barbed Vacuum Tube Fitting Barbed X NPT Male for 1/4" Tube ID, 1/8" NPT

1x 44555K124 US$2.77 Brass Double-Barbed Vacuum Tube Fitting Barbed X NPT Female for 1/4" Tube ID, 1/8" NPT

1X 50745K16 US$7.88 Hi-Pressure Brass Single-Barbed Tube Fitting Barbed X NPT Male for 1/8" Tube ID, 1/8" NPT

CORALLARO
1X 3820K11 US$8.04 Pulsation-Damping Snubber Brass, 1/8" NPT, .004" Orifice, 2000 PSI

1X 4034K61 US$7.98 Pulsation-Damping Snubber with Filtering Disc Brass, 1/8" NPT Connections, 10 Micron, 3000 PSI

(Corallaro, if you can try out the brass 10 micron filter, I will test the 45 micron filters).

TOTAL: US$71.32

Tom Rose · 26th February 2007, 14:26

Quote: (Originally Posted by marekm)

Hi Tom,

Here is the final order for McMaster Carr. I'll PM you my details so we can get this order sorted out.

MAREKM
1X 3820K11 US$8.04 ulsation-Damping Snubber Brass, 1/8" NPT, .004" Orifice, 2000 PSI

1X 3820K41 US$17.09 Pulsation-Damping Snubber Type 303 SS, 1/8" NPT, .004" Orifice, 4000 PSI

1X 4034K62 US$7.98 Pulsation-Damping Snubber with Filtering Disc Brass, 1/8" NPT Connections, 40 to 45 Micron, 3000 PSI

1X 4034K66 US$10.16 Pulsation-Damping Snubber with Filtering Disc 303 SS, 1/8" NPT Connections, 40-45 Micron, 5000 PSI

1X 44555K131 US$1.38 Brass Double-Barbed Vacuum Tube Fitting Barbed X NPT Male for 1/4" Tube ID, 1/8" NPT

1x 44555K124 US$2.77 Brass Double-Barbed Vacuum Tube Fitting Barbed X NPT Female for 1/4" Tube ID, 1/8" NPT

1X 50745K16 US$7.88 Hi-Pressure Brass Single-Barbed Tube Fitting Barbed X NPT Male for 1/8" Tube ID, 1/8" NPT

CORALLARO
1X 3820K11 US$8.04 Pulsation-Damping Snubber Brass, 1/8" NPT, .004" Orifice, 2000 PSI

1X 4034K61 US$7.98 Pulsation-Damping Snubber with Filtering Disc Brass, 1/8" NPT Connections, 10 Micron, 3000 PSI

(Corallaro, if you can try out the brass 10 micron filter, I will test the 45 micron filters).

TOTAL: US$71.32

How do you want this stuff sent from the US?

Tom Rose

marekm · 26th February 2007, 14:42

Tom: I'm thinking of using USPS air mail with tracking number (incase they lose the package somewhere along the way). But if there is a good reason not to use USPS, please advise me of a better postage service (Fedex or DHL?).

Tom Rose · 26th February 2007, 14:56

Quote: (Originally Posted by marekm)

Tom: I'm thinking of using USPS air mail with tracking number (incase they lose the package somewhere along the way). But if there is a good reason not to use USPS, please advise me of a better postage service (Fedex or DHL?).

UPS Air it is...

I will have costs later today with bank stuff via PM

koputai · 28th February 2007, 01:32

Guys,
Am I too late? Can I please please please get the following?
2X 3820K41 US$17.09 Pulsation-Damping Snubber Type 303 SS, 1/8" NPT, .004" Orifice, 4000 PSI

Many Thanks,
Jason.

24th February 2007, 12:18	#21 (permalink)
Tom Rose Still Learning Current Rebreather/s: Other CCR Home Build Other Rebreather/s: Prism Topaz Other CCR Home Build Join Date: Oct 2005 Location: USA,North Carolina Posts: 331	Re: McMaster Carr CMF orifices and filters Quote: (Originally Posted by marekm) To interested parties, here is the order as it stands on the 25/2/07. Unless there are anymore changes to the order, I’m going to contact Tom on Monday and to arrange payment. MAREKM 1X 3820K11 US$8.04 ulsation-Damping Snubber Brass, 1/8" NPT, .004" Orifice, 2000 PSI 1X 3820K41 US$17.09 Pulsation-Damping Snubber Type 303 SS, 1/8" NPT, .004" Orifice, 4000 PSI 1X 4034K62 US$7.98 Pulsation-Damping Snubber with Filtering Disc Brass, 1/8" NPT Connections, 40 to 45 Micron, 3000 PSI 1X 4034K66 US$10.16 Pulsation-Damping Snubber with Filtering Disc 303 SS, 1/8" NPT Connections, 40-45 Micron, 5000 PSI 2X 44555K131 US$1.38 Brass Double-Barbed Vacuum Tube Fitting Barbed X NPT Male for 1/4" Tube ID, 1/8" NPT 1X 50745K16 US$7.88 Hi-Pressure Brass Single-Barbed Tube Fitting Barbed X NPT Male for 1/8" Tube ID, 1/8" NPT CORALLARO 1X 3820K11 US$8.04 Pulsation-Damping Snubber Brass, 1/8" NPT, .004" Orifice, 2000 PSI 1X 4034K61 US$7.98 Pulsation-Damping Snubber with Filtering Disc Brass, 1/8" NPT Connections, 10 Micron, 3000 PSI (Corallaro, if you can try out the brass 10 micron filter, I will test the 45 micron filters). TOTAL: US$69.93 I have noticed that you went with 1/8 NPT....do you have access to 1/8" NPT to low pressure port adapters? If so no problem....just do not want you to go down a dead end..... Tom __________________ The 50-50-90 rule: Anytime I have a 50-50 chance of getting something right, there's a 90% probability I'll get it wrong the first time. www.atlimp.com
(Offline)

24th February 2007, 12:45	#22 (permalink)
Dave Sutton Diveshop of Horrors Current Rebreather/s: Sport Kiss MK 15.X rEvo Other CCR Azimuth Home Build Other Rebreather/s: Evolution Megalodon rEvo Other CCR Azimuth Home Build Join Date: Jun 2006 Location: Narragansett, Rhode Island and Hackettstown, New Jersey Posts: 2,907	Re: McMaster Carr CMF orifices and filters Quote: (Originally Posted by Tom Rose) I have noticed that you went with 1/8 NPT....do you have access to 1/8" NPT to low pressure port adapters? If so no problem....just do not want you to go down a dead end..... Tom No need to worry, as best way probably isn't hard plumbing to the first stage. My suggestion has always been to stick with 1/8 NPT and then use female NPT to barb fittings. Screw one on each side of the orifice and then cut any old LP hose and stick the barbed assembly in the middle. Makes it streamlined and there is no clump of metal hard plumbed to the regulator to get broken off. Flexible = good. Dave __________________ "Silent Diving with No Bubbles and No Politics".... www.nobubblediving.com
(Offline)

24th February 2007, 13:47	#23 (permalink)
marekm Banned Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Oct 2006 Location: Brisbane, Australia Posts: 196	Re: McMaster Carr CMF orifices and filters Quote: (Originally Posted by Dave Sutton) No need to worry, as best way probably isn't hard plumbing to the first stage. My suggestion has always been to stick with 1/8 NPT and then use female NPT to barb fittings. Screw one on each side of the orifice and then cut any old LP hose and stick the barbed assembly in the middle. Makes it streamlined and there is no clump of metal hard plumbed to the regulator to get broken off. Flexible = good. Dave That is exactly what I was going to do. Plus I can machine 1/8 NPT adaptors as required. But I'm still going with the flexible solution since I have short LP hose offcuts (with 3/8UNF fittings) left over from setting up my twinset. However, can you tell me why you would install a shutt-off valve before the orifice as some people have done? Or is it easier to just turn off valve on the O2 tank. Thanks in advance. -Marek
(Offline)

24th February 2007, 22:28	#24 (permalink)
bletso An independent diver. Current Rebreather/s: Dolphin Home Build Other Rebreather/s: Dolphin Home Build Join Date: May 2006 Location: Louisville, KY, USA Posts: 263	Re: McMaster Carr CMF orifices and filters Quote: (Originally Posted by marekm) Hi everyone, 1. What diameter orifice do I need for a 0L/min to 1L/min flow rate. -Marek Try this formula Flow through a sonic orifice Flow (lpm) = 11Pbar * D2 P = pressure in bars D = diameter in mm I can't remember where I found it, but it is simple and works well. Dale
(Online)

25th February 2007, 00:42	#25 (permalink)
Dave Sutton Diveshop of Horrors Current Rebreather/s: Sport Kiss MK 15.X rEvo Other CCR Azimuth Home Build Other Rebreather/s: Evolution Megalodon rEvo Other CCR Azimuth Home Build Join Date: Jun 2006 Location: Narragansett, Rhode Island and Hackettstown, New Jersey Posts: 2,907	Re: McMaster Carr CMF orifices and filters Quote: (Originally Posted by marekm) That is exactly what I was going to do. Plus I can machine 1/8 NPT adaptors as required. But I'm still going with the flexible solution since I have short LP hose offcuts (with 3/8UNF fittings) left over from setting up my twinset. However, can you tell me why you would install a shutt-off valve before the orifice as some people have done? Or is it easier to just turn off valve on the O2 tank. Thanks in advance. -Marek You place a shut off so you are not free-flowing 02 when you are dressing and undressing into the rig, and so you can shut down the flow if the PP02 goes high (maybe sitting taking a photo if the flow is a little high). It just makes the rig easier to manage. Use the McMaster-Carr 18 NPT valve I gave the number of before and screw the orifice directly to the valve and place it where it is easy to reach. This is just easier than getting to the cylinder valve while sitting on the bench, that's all. Dave __________________ "Silent Diving with No Bubbles and No Politics".... www.nobubblediving.com
(Offline)

26th February 2007, 13:22	#26 (permalink)
marekm Banned Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Oct 2006 Location: Brisbane, Australia Posts: 196	Re: McMaster Carr CMF orifices and filters Hi Tom, Here is the final order for McMaster Carr. I'll PM you my details so we can get this order sorted out. MAREKM 1X 3820K11 US$8.04 ulsation-Damping Snubber Brass, 1/8" NPT, .004" Orifice, 2000 PSI 1X 3820K41 US$17.09 Pulsation-Damping Snubber Type 303 SS, 1/8" NPT, .004" Orifice, 4000 PSI 1X 4034K62 US$7.98 Pulsation-Damping Snubber with Filtering Disc Brass, 1/8" NPT Connections, 40 to 45 Micron, 3000 PSI 1X 4034K66 US$10.16 Pulsation-Damping Snubber with Filtering Disc 303 SS, 1/8" NPT Connections, 40-45 Micron, 5000 PSI 1X 44555K131 US$1.38 Brass Double-Barbed Vacuum Tube Fitting Barbed X NPT Male for 1/4" Tube ID, 1/8" NPT 1x 44555K124 US$2.77 Brass Double-Barbed Vacuum Tube Fitting Barbed X NPT Female for 1/4" Tube ID, 1/8" NPT 1X 50745K16 US$7.88 Hi-Pressure Brass Single-Barbed Tube Fitting Barbed X NPT Male for 1/8" Tube ID, 1/8" NPT CORALLARO 1X 3820K11 US$8.04 Pulsation-Damping Snubber Brass, 1/8" NPT, .004" Orifice, 2000 PSI 1X 4034K61 US$7.98 Pulsation-Damping Snubber with Filtering Disc Brass, 1/8" NPT Connections, 10 Micron, 3000 PSI (Corallaro, if you can try out the brass 10 micron filter, I will test the 45 micron filters). TOTAL: US$71.32
(Offline)

26th February 2007, 14:26	#27 (permalink)
Tom Rose Still Learning Current Rebreather/s: Other CCR Home Build Other Rebreather/s: Prism Topaz Other CCR Home Build Join Date: Oct 2005 Location: USA,North Carolina Posts: 331	Re: McMaster Carr CMF orifices and filters Quote: (Originally Posted by marekm) Hi Tom, Here is the final order for McMaster Carr. I'll PM you my details so we can get this order sorted out. MAREKM 1X 3820K11 US$8.04 ulsation-Damping Snubber Brass, 1/8" NPT, .004" Orifice, 2000 PSI 1X 3820K41 US$17.09 Pulsation-Damping Snubber Type 303 SS, 1/8" NPT, .004" Orifice, 4000 PSI 1X 4034K62 US$7.98 Pulsation-Damping Snubber with Filtering Disc Brass, 1/8" NPT Connections, 40 to 45 Micron, 3000 PSI 1X 4034K66 US$10.16 Pulsation-Damping Snubber with Filtering Disc 303 SS, 1/8" NPT Connections, 40-45 Micron, 5000 PSI 1X 44555K131 US$1.38 Brass Double-Barbed Vacuum Tube Fitting Barbed X NPT Male for 1/4" Tube ID, 1/8" NPT 1x 44555K124 US$2.77 Brass Double-Barbed Vacuum Tube Fitting Barbed X NPT Female for 1/4" Tube ID, 1/8" NPT 1X 50745K16 US$7.88 Hi-Pressure Brass Single-Barbed Tube Fitting Barbed X NPT Male for 1/8" Tube ID, 1/8" NPT CORALLARO 1X 3820K11 US$8.04 Pulsation-Damping Snubber Brass, 1/8" NPT, .004" Orifice, 2000 PSI 1X 4034K61 US$7.98 Pulsation-Damping Snubber with Filtering Disc Brass, 1/8" NPT Connections, 10 Micron, 3000 PSI (Corallaro, if you can try out the brass 10 micron filter, I will test the 45 micron filters). TOTAL: US$71.32 How do you want this stuff sent from the US? Tom Rose __________________ The 50-50-90 rule: Anytime I have a 50-50 chance of getting something right, there's a 90% probability I'll get it wrong the first time. www.atlimp.com
(Offline)

26th February 2007, 14:42	#28 (permalink)
marekm Banned Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Oct 2006 Location: Brisbane, Australia Posts: 196	Re: McMaster Carr CMF orifices and filters Tom: I'm thinking of using USPS air mail with tracking number (incase they lose the package somewhere along the way). But if there is a good reason not to use USPS, please advise me of a better postage service (Fedex or DHL?).
(Offline)

26th February 2007, 14:56	#29 (permalink)
Tom Rose Still Learning Current Rebreather/s: Other CCR Home Build Other Rebreather/s: Prism Topaz Other CCR Home Build Join Date: Oct 2005 Location: USA,North Carolina Posts: 331	Re: McMaster Carr CMF orifices and filters Quote: (Originally Posted by marekm) Tom: I'm thinking of using USPS air mail with tracking number (incase they lose the package somewhere along the way). But if there is a good reason not to use USPS, please advise me of a better postage service (Fedex or DHL?). UPS Air it is... I will have costs later today with bank stuff via PM __________________ The 50-50-90 rule: Anytime I have a 50-50 chance of getting something right, there's a 90% probability I'll get it wrong the first time. www.atlimp.com
(Offline)

28th February 2007, 01:32	#30 (permalink)
koputai Subsea Systems Current Rebreather/s: MK 15.X Other CCR Other SCR Other Rebreather/s: Not Bought Yet Other CCR Other SCR Join Date: Jul 2005 Location: Sydney, Australia Posts: 350	Re: McMaster Carr CMF orifices and filters Guys, Am I too late? Can I please please please get the following? 2X 3820K41 US$17.09 Pulsation-Damping Snubber Type 303 SS, 1/8" NPT, .004" Orifice, 4000 PSI Many Thanks, Jason.
(Offline)

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode