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# Water Pressure Gauge Idea

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Posted · Original PosterOP

Ok so I have been doing more research on head pressure and flow rate. While I was doing this I got an idea, what if I adapted a inline water psi gauge into a pc water cooling loop. Could I use it to measure the head pressure in different parts of my loop?

#### Converting pressure in psi to head in feet

h = 2.31 p / SG

where

p = pressure (psi)

It seems like a fun project to better understand how a water loop works...

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You're better off looking at this formula:

dP

—  =  - ρ * g

dh

where P is the pressure, the greek letter rho (ρ) is the density of the fluid, g is the gravitational acceleration (9.81 m/s2 or 9.81 N/kg) and h is the height.

After integration:

ΔP = - ρ * g * Δh

Here you can see that the pressure difference is dependent on the density of the fluid.

The density is, on its part, dependent on the temperature (T):

ΔP (T) = - ρ (T) * g * Δh

So you can already see that in a cooling loop (where the temperature changes), you also need to incorporate a temperature measurement to correct for the changing density.

It all depends on how accurate you would like your pressure measurements to be and the actual fluid in the loop.

If it is simply for fun, then... hey why not?

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I have pre-and-post particulate filter pressure gauges on my whole-house loop.  I use the information to set the pump voltage to maintain 20psi (any higher and it just creates chances for leaks and such).  It also tells me how clogged the filter is.

There isn't much purpose to do it in a desktop watercooling loop.  Any flow is sufficient.  If you insist, you can buy an NPT tee, put NPT -> barbs on the in-line ports and then a pressure gauge on the top port.   Alternatively Aquacomputer I believe makes a pressure gauge that will directly work with g1/4.

Workstation: 9900KF @ 5.0Ghz || ASRock Z390 Taichi Ultimate || Gigabyte 1080Ti || G.Skill DDR4-3800 @ 3600 4x8GB || Corsair AX1500i || 11 gallon whole-house loop.

LANRig/GuestGamingBox: 8600K@ 4.9Ghz || Gigabyte Z270 Gaming 9  || EVGA Titan X (Maxwell) || Corsair SF600 || CPU+GPU watercooled 280 rad push only.

Server Router (Untangle): 8350K @ 4.7Ghz || ASRock Z370 ITX || 2x8GB || PicoPSU 250W, running on AX1200i from Server Storage || CPU watercooled, 11 gallon whole-house loop.

Server VM/Plex/HTTPS: E5-2699v4 (22 core!) || Asus X99m WS || GT 630 || Corsair RM650x || CPU watercooled, 11 gallon whole-house loop.

Server Storage: Pent. G3220 || Z87 Gryphon mATX || || LSI 9280i + Adaptec + Intel Expander || 4x10TB Seagate Enterprise Raid 6, 3x8TB Seagate Archive Backup, Corsair AX1200i (drives) Corsair RM450 (machine) || CPU watercooled, 11 gallon whole-house loop.

Laptop: HP Elitebook 840 G3 (Intel 8350U).