Enema psi

Can anyone provide an equivalent PSI rating for a given bag height?

I know it sounds geeky but I'd like to understand this in terms of maximum safe distance. Generally 18" to 36" is standard.

Can I go as high as 5' or is the pressure too risky?

Usually with the normal hose diam, you cannot get above 2.0 PSI the normal PSI safe for flow is 1.5 anything higher is normally a presurized system.

5/8" I.D. hose size

Hose dia is not the only variable...I think it has more to do with weight and height.

Just remeber--slow is always better with respect to discomfort.

I totlaly agree with this. hanging the bag too high can only cause discomfort, and perhaps do some sort of damage. most of us here do this for pleasure i think, and the women i know definitely do them for pleasure and the increase in orgasmic pleasure.

The enema bags say 18-24 inches but i find even at 18" it can cause cramping. If you want a gentle enema hang the bag about 12" and plan on 5-10 minutes to take the whole bag

The average length of a standard irrigator hose has its reason, it determines the preasure recommendet. Of course You may place your Hotwaterbottle with Screwadaptor in the upper floor, but i would not advice it. Keep in mind: lower preasure will allow You to take more, if You want to be shure, insert a flowmeter gadget into the hose, on the spinning wheel You may watch the flowspeed, or a drip glas. In this case one should have a screwclamp to regulade the flowspeed.

As to the Flowmeter go:

www.extremerestraints.com/enema-flow-meter_1932.html

You can hang the bag at 5 feet. The actual force of the enema is determined by the diameter of the hose and the height. The height determines the maximum pressure that can build up in your colon to remove blockages. The actual pressure in your colon is determined by the height of the water left in the hose after you are finished taking your enema. this is usually only a few inches. The feeling of bloating comes from the amount of the water in your colon and its expansion.

The pressure is determined solely by the height of the bag. The height and the hose diameter, plus any constrictions in the hose (or in you) determine the flow rate.

Water pressure increases by one atmosphere (14.7 PSI) every 10.3 meters (33.9 feet), or one PSI every 2.3 feet. Most enema guides I have seen suggest a limit of 2 or 3 PSI, or about 4 and a half to 7 feet. (140 to 210 cm for our European buds)

**WARNING: SCIENCE CONTENT: Okay, for the original poster, a fellow geek, water pressure is caused by gravity pulling downward...the bit of water at the top has only air pressure on it, while the water at the bottom has the entire depth of water above it pressing down. Shape and size do not matter to water pressure in this context, only height / depth. So hanging the bag at 4'6" will give you 2 PSI of pressure whether you use a skinny drugstore hose or a fire hose hanging off the bag. The bigger hose will give you a greater flow rate, in quarts per minute or whatever. Increasing the pressure will also increase the flow rate, but the bigger hose will not increase the pressure.

What the difference in how it feels is, I don't know, I've never tried a bigger hose. But I do know I get more cramping with more pressure.

This is how it is: One pound per square inch pressure (1 psi) is generated by a column of water exactly 27.68 inches tall. That is very close to 1/2 psi for every 14". That means five feet or 60" gives a pressure of 2.16 psi. The colon can easily contain that pressure, but that is as high as I would go. Above that the pressure starts to get too high and it will feel uncomfortable. Unless you have a really strong sphincter, you will probably need a double balloon rectal catheter to help retain that if you plan on holding it very long. Bigmike is correct about the final pressure in your colon being determined by the final height of fluid in the tube after your bag is empty or you are completely full and stop taking in any more fluid, but the presence of blockages can increase the pressure, however, they still won't be more than what is dictated by the height of the bag.

The diameter of the tube does not affect the pressure. Pressure is defined purely by column height. If you have a very small diameter tube, it will flow slowly, if you use a 1/2"ID diameter tube, your guts will fill VERY FAST, especially if you have been cleaned out first. Have fun!

One great understanding of pressure with regards to bag height.

1. Remove nozzle from tube.

2. Fill bag about half with water.

3. Drain air from tube.

4. Lay flat on floor.

5. Put tube end in your mouth.

6. Open clamp and blow water back up.

Not to beat a dead horse to death here, but there has been alot of fact stated regarding PSI, height, hose diameter, final pressures, etc. One of the biggest complaints I hear is how to slow down the flow. I like to hang my bags a minimum of 4' and I have done it as high as the ceiling with someone on the bed with no problems. Keep in mind, I do my calculations(engineer in me) that for every foot is .43 PSI roughly. To me this prevents back flow, and looks cooler to have the bag hung high. Using standard equipment, the water will flow fast with the clamp wide open. This I find uncomfortable to say the least so I have added an adjustable clamp up near the top of the bag and use a second clamp near the nozzle for off/on flow. I fill the bag and set it to the height I am going to use it and adjust the flow to just a trickle. For me the object of the enema is to keep it to a comfortable level and by letting it flow in slowly allows the body to adjust, and sometimes I stop the flow and wait a minute for one to feel relaxed. I have found a slow enema allows for more comfort, larger quantities, and most importantly more fun. And there's always that sadistic streak in me that comes to the surface from time to time

I hang mine at door hight and take slow to get the full 6 quarts and then i hold it all day till i urinate everything out! 😜

I was waiting for the kinky geeks to reply (being one myself).

Thanks elsdragon and switchablesusie; you get an A+ for physics!

Hope it was a learning experience for all.

1 PSI = 27.68" water column (39F at sea level)

(Temp and gravitational constant variations are negligable.)

Now we just need some info on colon physiology to understand safe pressures.

Generally speaking, hanging a bag w/ hose develops between 1 to 3 PSI (you can do the math for height). I believe up to 3 PSI to be a safe zone.

Would like some confirmation from anyone in the medical arena.

Good mathematics! The peristaltic pressure (creating of the colon own movements) is about 0.25 atm, this is aprox. 3.6 PSI. Therefore the bag height about 2 to 5 feet is a safe area.

I like to hang my bag as high as I can get it and control the flow with the adjustable shut off clamp.

I hang the bag high if I want a fast ,fill up on 2qts 30 to 40 sec. If iwant large amount I hang the bag low can take 6 to 7 qts this way .If I want to hold for long time also hang it low usly can hold 1to 2 qts this way as long as I want.

[quote author=marvin link=topic=322.msg12757#msg12757 date=1203950435]

I like to hang my bag as high as I can get it and control the flow with the adjustable shut off clamp.

[/quote]

Same goes for me.

I stand for my enemas, and most times place the bag on the shelf above tub. I have a sight tube to watch the flow rate. It's very interesting to watch the flow change when you start to cramp.

If I lie on the floor that gives me 7 feet of height difference. 7Feet X 12 Inches = 84 inches. 84 inches X 0.0374 = 3.03 psi

I personally prefer to have the bag at least 4 feet higher than the injection point. I have found that using a ramp clamp allowes you to adjust the flow to a point that you minimize or e;liminate cramping. I try to stop the flow just as soon as the bag is almost completely empty, my reasoning is the static pressure of that height assures little or no backflow which reduces the ultimate cleanup afterwards. I also have a system that uses a Higginson type bulb which guarantees no backflow, with this arrangement cleaning the bag only involves a rinseout and is accomplished very quickly.

Interesting discussion; I always use a little rope and pulley so I can vary the height as I go but the range is about 2 to 6 feet.

Great discussion. You've all hit it dead on with bag height. I'm taking a fluid mechanics course right now...

Pressure=waterweight*height

Volume of water is in no way related.

Pretty sure others have covered the equation in more detail so I'll leave it at that, I could go much further on the subject if you want more.

Cheers

I would like to counter by mentioning that the pressure drops as the bag empties due to less water weight.

I once made a pully and weight that allowed the bag to raise as it emptied thus keeping the pressure near constant until the very end. (no pun intended)

Bob

I shall attempt to present the calculation of water pressure in a bit of

a different way since it is the way that I remember. It agrees with all

of the others and the afore mentioned PSI figure of .433 lb/vertical foot

is accurate and may be more information you may need to give or take an

enema.

I begin with the fact that a cubic foot of water weighs 62.416 pounds at

zero degrees Celsius. The base of that cube is 12 inches on a side or

144 square inches. To arrive at the pressure per square inch we must

divide the 62.416 pounds exerted on the total base by 144 sq. in. to get

the pressure of a column of water with a 1 square inch at its base and

12 inches high. Thus 62.416/144= PSI.

In the case of your enema 2 PSI is where discomfort likely starts to

occur and 3 PSI is an absolute maximum that should not be exceeded.

As has been mentioned in previous posts, the measurement of colonic

pressure can be made by measuring the distance from the point of injection

to the top of the meniscus after the end of the flow of the enema fluid.

Practically, to attain 1 pound of colonic pressure the bag shold be raised

12/.4344444 =27.6 inches measured from the point of injection, the anus, to

the top of the meniscus in the bag or tubing. Also it is important not to

confuse pressure with flow. Flow will continue until colonic pressure

equals the pressure at the point of injection. The diameter of the tube

has no effect on the pressure, only the flow rate.

After all is said and done hang your bag at a height that is comfortable

and enjoyable. All of the above discussion is only a way to calculate a

height which for many devotees of "the Bag" is between T\twelve and thirty

six inches.

I prefer 3 or 4ft high for enema bag,however ,if youfeel too much pressure,shut off clamp and lower the bag.Just remember that hanging the bag lower than 18in.could cause a backflow,that is solution coming out of you into the bag.

Let the good times flow. w/m 72yrs/W.Massachusetts

I also often hang the bag on the shower rod. I can often take 4-quarts in the knee chest position at that height. I usually find that this is easier than a slow lower height enema.

When I was in 8[sup]th[/sup] grade science class and the teacher told us 0.036 pounds/inch for a column of water, the first thing I did was calculate enema water pressure. I used to sit up front in science class. It was one of the few classes I found interesting. The teacher could see I was doing math before he even gave us a problem and asked what I was doing. I got all red and stuttered for an answer. I finally said I was calculating the pressure in the hose. I didn't say what hose and luckily he didn't ask.

Fetish fiend from an early age --- Fred

P.S. How does adding soap to the enema water effect the flow rate though the hose?

[quote author=fredmushell link=topic=322.msg172198#msg172198 date=1232394998]

. . . . . P.S. How does adding soap to the enema water effect the flow rate though the hose?

[/quote]

Negligibly.

However, if you want to get picky, since soap is a wetting agent and the water becomes more lubricious and its contact angle with surfaces (tubing in this case) goes down. So, in theory the flow rate, but not the pressure can increase infinitesimally to slightly. (That's if you use small amounts of soap, not so much that the solution becomes a thick slime.)

N.B.: The decrease in contact angle can be seen by taking a drop of water and placing it on a clean glass plate and another drop with the soapy water and placing it on the same plate. You will see the soapy water will spread out more on the surface because the contact angle is decreased. This ability to spread over a surface means the water is "wetter" and will flow more easily over a surface like the plate or through a tube, which can increase its flow rate. You probably will need equipment to measure the difference. I don't think you could even measure it with anything you have at home.

And last I checked, it was .34

To answer this question, one must know that a cubic foot

of water weighs approximately 62.5 pounds plus minus up to

.4 pounds. That cubic foot has 144 cubic inches at its base.

To calculate the weight of a column of water one foot igh,

divide 62.5 pounds per square foot by 144 inches per square

foot, i.e. 62.5/144=.43 pounds per square inch. Since there are twelve inches in a foot, a vertical tube filled

with water that is 12 inches tall will exert .43 pounds

per square foot.

This does not mean that the colonic pressure of an enema

while the water is flowing is the same as this calculation.

The colonic pressure only reaches the calculated pressure

then the flow stops making that .43 pounds a per foot from

the top of the water in the bag to the point of injection

happens only when the flow stops. A nice comfortable,

although not filling colonic pressure is about one psi

(psi meaning pounds per square inch.)

Taking your 5 foot hose length means that a maximum colonic pressure would be 2.15 psi. Most colonic hydro

therapists consider an absolute max. colon pressure to

be 3 psi.

My personal experience is that I have a thirteen gallon

tank from which I take multiple enemas in one session.

The total fall from the top of the water to the point of

injection is approximately six feet. I regulate the

colonic pressure with a ratchet type clamp that comes with

most enema bags. For the most part I don't worry about

pressure, but rather how full I feel. For me, that

pressure is a bit over two pounds and about four and a

half quarts.

I hope that I have not over explained my answer. Probably

the best answer to a question like yours is, "if it feels

good, do it!" Generally, a fall distance, from the top of

the water to point of injection, of about 18 inches will

give you a slow more comfortable enema. As you increase

the height of the bag both the flow rate and the colonic

pressure will increase along with the possibility for

cramps.

After all is said and done, rember, "It's an enema, not

a race!" It should be a gift of love to be enjoyed as a

healthful habit.

Another way to state the results of this calculation

is that

for every inch of tubing