Boiler Not Heating Water
#41
02-22-15, 04:27 PM
And since they say in Table 3 that they recommend 1" pipe for a 20F rise, that would seem to imply that W-M thinks it's OK to run 1" pipe at 12 GPM... right?
You don't see anything wrong with that picture?
You don't see anything wrong with that picture?
#42
02-22-15, 05:24 PM
HW,
Weil McLain CGa 3,4,5 have 1" tappings, 6,7 have 1 1/4" and 8 has 1 1/2".
I don't have any data to quantitatively say that. I did mean to say that the stress would fall within a acceptable range qualitatively, for systems that are not rapidly chilled.
Have you been listening to Prof. Irwin Corey.
Weil McLain CGa 3,4,5 have 1" tappings, 6,7 have 1 1/4" and 8 has 1 1/2".
I don't have any data to quantitatively say that. I did mean to say that the stress would fall within a acceptable range qualitatively, for systems that are not rapidly chilled.
Have you been listening to Prof. Irwin Corey.
#43
02-22-15, 05:36 PM
Weil McLain CGa 3,4,5 have 1" tappings,
Read post #34.
The boiler TAPPINGS are 1-1/4. Look at the notes below table 3. But they recommend reducing to 1" for the 3,4,5 section.
12 GPM is 4.34 ft/sec. for 1in pipe.
4 ft/s = 9.7 GPM
5 ft/s = 12.1 GPM
Not THAT far off... but a little.
IMHO, for 12 GPM they should spec 1-1/4"
#44
02-22-15, 05:40 PM
Trooper,
Suuply house .com.
They have the boilers there with all the specs.
WM generally has larger tappings and I was surprised myself. They do make other boilers and all have larger tappings but according to the specs the CGa's are as stated.
Suuply house .com.
They have the boilers there with all the specs.
WM generally has larger tappings and I was surprised myself. They do make other boilers and all have larger tappings but according to the specs the CGa's are as stated.
#45
02-22-15, 05:46 PM
OK, whatever... what I posted is right from the W-M manual for the boiler.
It's right there in b&w under table 3. Re-read it and you'll see what I mean.
I'm SURE they don't make different castings for the different number of sections. They have a front, a back, and middle casting and they pull the number of them that they need. It would make ZERO economic sense for a manufacturer to do otherwise.
It's right there in b&w under table 3. Re-read it and you'll see what I mean.
I'm SURE they don't make different castings for the different number of sections. They have a front, a back, and middle casting and they pull the number of them that they need. It would make ZERO economic sense for a manufacturer to do otherwise.
#46
02-22-15, 05:58 PM
Trooper,
I found what you saw. It doesn't seem to make any sense. Right above the box with what you said is another box that gives you the boiler with the tapings. WM proof reading is out the window or I'm missing something.
Troop, if look at a closeup of his boiler it comes right out of the boiler 1". No reducing coupling on there. Same on the return.
Confusing.
I found what you saw. It doesn't seem to make any sense. Right above the box with what you said is another box that gives you the boiler with the tapings. WM proof reading is out the window or I'm missing something.
Troop, if look at a closeup of his boiler it comes right out of the boiler 1". No reducing coupling on there. Same on the return.
Confusing.
#47
02-22-15, 09:56 PM
Trooper
Type M 1.055" Inside Dia. .035" Wall Thickness
4.0 ft/sec 10.91 gpm
4.4 ft/sec 12.0 gpm
5.0 ft/sec 13.64 gpm
5.13 ft/sec 14.0 gpm
STANDARD WEIGHT STEEL - SCH. 40 1.049" Inside Diameter
4.0 ft/sec 10.77 gpm
4.45 ft/sec 12.0 gpm
5.13 ft/sec 14.0 gpm
VELOCITY CHART & FRICTION OF WATER
Grundfos HVAC Technical Data Booklet.qxd 10/2/2002
Same for Taco pump selection
Selecting Circulators TD10
Not in the chart I use...
4 ft/s = 9.7 GPM
5 ft/s = 12.1 GPM
4 ft/s = 9.7 GPM
5 ft/s = 12.1 GPM
4.0 ft/sec 10.91 gpm
4.4 ft/sec 12.0 gpm
5.0 ft/sec 13.64 gpm
5.13 ft/sec 14.0 gpm
STANDARD WEIGHT STEEL - SCH. 40 1.049" Inside Diameter
4.0 ft/sec 10.77 gpm
4.45 ft/sec 12.0 gpm
5.13 ft/sec 14.0 gpm
VELOCITY CHART & FRICTION OF WATER
Grundfos HVAC Technical Data Booklet.qxd 10/2/2002
Same for Taco pump selection
Selecting Circulators TD10
#48
02-23-15, 07:30 AM
This from the 'Copper Tubing Handbook' is interesting, is it not?
Water Velocity Limitations—
To avoid excessive system noise and
the possibility of erosion-corrosion, the
designer should not exceed flow
velocities of 8 feet per second for cold
water and 5 feet per second in hot water
up to approximately 140°F. In systems
where water temperatures routinely
exceed 140°F, lower flow velocities
such as 2 to 3 feet per second should not
be exceeded.
To avoid excessive system noise and
the possibility of erosion-corrosion, the
designer should not exceed flow
velocities of 8 feet per second for cold
water and 5 feet per second in hot water
up to approximately 140°F. In systems
where water temperatures routinely
exceed 140°F, lower flow velocities
such as 2 to 3 feet per second should not
be exceeded.
Last edited by NJT; 02-23-15 at 03:59 PM.
#49
02-23-15, 01:08 PM
Does ASHRAE say anyting about copper pipe?
Depends on how aggressive the chemistry of the water is but
tell that to the Copper-tube boiler manufactures, they use 7.0 ft/sec.
for the turbulence, all the turns are in brass or CI though.
Depends on how aggressive the chemistry of the water is but
tell that to the Copper-tube boiler manufactures, they use 7.0 ft/sec.
for the turbulence, all the turns are in brass or CI though.
#50
02-23-15, 04:04 PM
Dunno, hain't looked... yet...
That previous quote came from here:
http://www.copper.org/publications/p...e_handbook.pdf
That previous quote came from here:
http://www.copper.org/publications/p...e_handbook.pdf
