Plumbing as a Hobby

Plumbing as a Hobby

I work at Mosigra, a board game company. You'd think my hobbies would involve games, puzzles, or maybe programming. But a couple of years ago, I accidentally discovered something unexpected — plumbing turned out to be genuinely fascinating.

It all started when we were renovating the office and I needed to figure out the water supply situation. I called a plumber, he quoted an astronomical sum, and I thought: "How hard can it be?" Famous last words, right? But unlike most stories that start this way, this one actually turned out well.

The Basics: What I Wish Someone Had Told Me

The first thing that struck me was how logical plumbing systems are. Once you understand the basic principles, everything clicks into place. Here's what I learned:

Water pressure is typically 2-4 atmospheres in city systems. Everything in your plumbing — pipe diameters, fitting types, valve ratings — is designed around managing this pressure. Higher floors get lower pressure (gravity works against you), which is why booster pumps exist.

Pipe materials have evolved dramatically:

• Steel pipes — the old standard. Pros: strong, well-understood. Cons: they rust, scale builds up inside (reducing flow over time), difficult to work with (threading, welding). In old buildings, you can sometimes find pipes that have lost half their internal diameter to scale buildup.
• Copper pipes — excellent but expensive. They don't corrode like steel, have natural antibacterial properties, and last essentially forever. The downside: cost, and you need soldering skills to join them.
• Polypropylene (PP) pipes — the modern standard for home plumbing. Cheap, easy to work with (you just need a soldering iron for plastic pipes), don't corrode, smooth interior surface. The catch: they can't handle temperatures above 95°C for extended periods, and they have significant thermal expansion.
• PEX (cross-linked polyethylene) — excellent for radiant floor heating and flexible connections. Very resistant to temperature and pressure. Joined with compression or press fittings.
• Metal-plastic (multilayer) pipes — aluminum core with plastic layers. Good thermal characteristics and low expansion, but the fittings can be problematic over time.

My First Project: Replacing the Office Bathroom Pipes

Armed with YouTube knowledge and a rented polypropylene welding iron, I tackled the office bathroom. The existing steel pipes were corroded and leaking at every joint.

Here's what the project involved:

1. Shutting off the water supply — sounds simple, but finding the right shutoff valve in an old building is an adventure in itself. Our building had valves that hadn't been turned in 20 years. I learned that you should never force a stuck gate valve — use penetrating oil and patience.
2. Removing old pipes — a reciprocating saw became my best friend. Old threaded connections that won't budge? Cut them.
3. Planning the new layout — this is where it gets interesting. You need to think about: pipe routing (avoiding unnecessary bends), proper slope for drain pipes (1-2 cm per meter), access for future maintenance, insulation for hot water pipes, and support brackets at proper intervals.
4. Soldering polypropylene — the technique is simple but requires precision. Heat both the pipe and fitting for the right amount of time (depends on diameter — 5-7 seconds for 20mm pipes, more for larger ones), then push them together firmly and hold for 10 seconds. The joint is actually stronger than the pipe itself — if you try to break it, the pipe will crack before the joint fails.
5. Testing — pressurize the system to 1.5x the working pressure and check every joint. I used a hand pump pressure tester borrowed from a neighbor who does this professionally.

The Satisfying Complexity of Drain Systems

Most people think drains are simple — water goes down, right? But there's surprising engineering involved:

Traps (siphons) keep sewer gases from entering your living space. The water sitting in the curved pipe section acts as a gas seal. If a drain isn't used for a long time, the water in the trap evaporates, and you start smelling the sewer. This is why unused drains should be filled with water periodically, or fitted with dry traps.

Venting is critical. Without proper venting, draining water creates a vacuum that can siphon water out of traps (remember — those traps are your gas seals). A proper drain system has vent pipes that extend to the roof, allowing air in to equalize pressure. If you hear gurgling when a toilet flushes or a sink drains, your venting might be inadequate.

Slope matters — too little slope, and solids accumulate. Too much slope, and the water runs away from the solids, also causing clogs. The sweet spot for most residential drains is 1-2 cm of fall per meter of horizontal run.

Tools of the Trade

Over time, I've accumulated a collection of plumbing tools that I'm oddly proud of:

• Polypropylene soldering iron — I eventually bought my own after the third project
• Pipe cutter — makes clean, square cuts (essential for good joints)
• Adjustable wrench set — plumbing uses a wide range of fitting sizes
• Teflon tape and pipe sealant — for threaded connections
• Drain snake (auger) — for the inevitable clogs
• Inspection camera — a small camera on a flexible cable, invaluable for looking inside pipes and drains
• Pressure gauge and test pump — for verifying your work

Things That Can Go Wrong (And Did)

The flooding incident: I once forgot to check if a valve was fully closed before cutting a pipe. The resulting fountain was... educational. Always double-check, and have towels ready.

The backwards fitting: On a check valve (which only allows flow in one direction), I installed it backwards. Everything looked fine until someone turned on the hot water, and it flowed into the cold water pipe instead. Check the arrow on the valve body!

The thermal expansion surprise: A long run of polypropylene pipe with hot water will expand significantly. My first installation didn't account for this, and the pipe bowed away from the wall. Now I always include expansion loops or use sliding supports for hot water runs.

Why It's Actually a Great Hobby

Here's why I genuinely recommend plumbing as a hobby:

1. Immediately useful. Unlike many hobbies, plumbing skills pay for themselves almost instantly. Every repair you do yourself saves hundreds of dollars.
2. Intellectually engaging. Designing a plumbing system involves fluid dynamics, materials science, building codes, and spatial reasoning. It's real engineering at a tangible scale.
3. Deeply satisfying. There's something primal about controlling water flow — making it go where you want, stopping it where you don't. Finishing a project and having everything work perfectly is incredibly rewarding.
4. Social currency. You become the person everyone calls when they have a plumbing problem. This sounds like a burden, but it's actually great — you get to practice your skills, help people, and build relationships.
5. Never boring. Every building is different, every problem is unique, and the field keeps evolving with new materials and techniques.

Resources for the Curious

If I've piqued your interest, here's where to start:

• YouTube channels dedicated to plumbing — there are excellent creators who show real-world installations step by step
• Your local building code — it might sound dry, but building codes are distilled wisdom from decades of things going wrong
• Hardware store workshops — many large home improvement stores offer free plumbing classes
• Forums and communities — online plumbing forums are surprisingly active and helpful

Start with something small — replace a faucet, install a new toilet, fix a leaky shutoff valve. You'll be surprised how quickly you get hooked. And the next time a plumber quotes you an insane amount for a simple job, you'll just smile, reach for your pipe wrench, and do it yourself.