Cylindrical Nostalgia

 

I have received the above photo from a brother HP who thought I'd like it, and he was totally correct. It shows a porter's hand opening the valve on a gas cylinder. The cylinder is F-size, about four feet long and weighing thirty pounds or so; and it contains pure oxygen. My guess is that it on a static installation for use in a ward, clinic or other department. Some large hospitals have a mains supply of some medical gases. They are piped all over the site from a large storage facility in the industrial block; the JRH was one of them. Smaller hospitals usually have their own departmental static supply and the cylinders have therefore to be changed regularly by we, the porters. Changing the cylinders is not difficult and we can learn it in a few minutes; but, like all portering skills, it takes longer to perfect. The regulator has a washer on it called a bodox seal and you have to be careful it doesn't stick to the cylinder valve. Once there it will be taken away with the empty cylinder. Many have been lost that way and a regulator without a bodox will just leak so much it is useless. As it is, very few seals are perfect, so don't worry if it makes a very slight hissing sound. If you fiddle with it a bit the hiss usually goes away. If it doesn't and the device is not in use, shut the valve. When you open the valve you should hear the gas flow into the regulator and even feel it vibrate. It's a very satisfying ASMR feeling actually. We used to crack the valve briefly before attaching it to blow out the dust and excess lubrication oil, but this was not common practice. The regulator has on it a pressure gauge that tells you how much gas is in the cylinder. Some of them also have a flowmeter, but not all, especially on portables and vehicle supply because they get broken easily. I knew an old senior who boasted he could read the pressure in a cylinder just by its weight. It's true that compressed gas does weigh something, but I didn't believe him; or at least I tried it and it didn't work. What's interesting about this photo is the porter is using a very old type of gas spanner, a big cast iron one that also has a built in lever for twisting very stiff attachment bolts. It has two heads, for F and G-size valves. They're a bit too heavy to carry around and so I only went and picked one up from the lodge as and when required. Thanks very much to my HPing online contact for this little taste of cylindrical nostalgia.