# Sovereignty Module: Shape the Pipe

## Complete Clay Pipe Making and Pottery Pipe Systems: From Clay to Conduit

Clay pipes have carried water, drained fields, and served as smoking pipes for millennia. This campaign covers pipe forming, firing, joining, and installation.

### Chapter 1: Pipe Types

| Type | Diameter | Length | Use | Difficulty |
|---|---|---|---|---|
| Drain tile (field drain) | 3-6 inches | 12-18 inches | Agricultural drainage | Low-moderate |
| Water pipe (pressure) | 2-6 inches | 12-24 inches | Water supply | Moderate |
| Sewer pipe | 4-12 inches | 24-36 inches | Waste removal | Moderate |
| Chimney flue liner | 6-12 inches | 24 inches | Chimney lining | Moderate |
| Smoking pipe (tobacco) | 1/2-1 inch bowl | 4-8 inches | Personal use | Low |
| Conduit (cable/wire) | 2-4 inches | 12-24 inches | Protecting cables | Low-moderate |

### Chapter 2: Pipe Forming Methods

Coil-built pipe: 1) Roll clay into long coils (1 inch diameter). 2) Wrap coils around wooden mandrel (form). 3) Smooth coils together inside and out. 4) Build up wall thickness to 3/8-1/2 inch. 5) Smooth exterior with paddle or rib. 6) Allow to stiffen slightly (leather-hard). 7) Remove mandrel carefully (twist and pull). 8) Smooth interior with damp sponge on stick. 9) Form bell end (flared socket) on one end. 10) Dry slowly (1-2 weeks). 11) Fire in kiln.

| Method | Pipe Size | Production Speed | Uniformity | Best For |
|---|---|---|---|---|
| Coil-built | Any | Slow | Variable | Small quantities, large pipes |
| Slab-rolled | 2-8 inches | Moderate | Good | Medium quantities |
| Extruded (pugmill) | 2-6 inches | Fast | Excellent | Large quantities |
| Wheel-thrown | 2-8 inches | Moderate | Good | Skilled potters |
| Press-molded | Any | Fast | Excellent | Standardized production |

### Chapter 3: Pipe Joints

| Joint Type | Seal Method | Flexibility | Difficulty | Best For |
|---|---|---|---|---|
| Bell and spigot | Mortar or oakum + lead | Low | Moderate | Traditional water/sewer |
| Butt joint (drain tile) | No seal (gaps intentional) | N/A | Very low | Field drainage |
| Mortar joint | Cement mortar | None | Low | Non-pressure applications |
| Rubber gasket | Rubber ring in bell | Moderate | Low | Modern adaptation |
| Slip joint (clay slip) | Clay slip before firing | None | Moderate | Permanent connections |

Bell and spigot joint: 1) One end of each pipe is flared (bell/socket). 2) Plain end (spigot) of next pipe inserts into bell. 3) Pack oakum (tarred hemp rope) into gap. 4) Pour molten lead or cement mortar over oakum. 5) Lead cools and seals joint. 6) Joint allows slight movement without breaking seal.

### Chapter 4: Drain Tile Installation

| Step | Action | Purpose | Specification |
|---|---|---|---|
| Survey | Map drainage pattern, identify outlets | Plan system | Water flows downhill |
| Trench | Dig trench along drainage line | House pipe | 18-36 inches deep, 1% minimum slope |
| Gravel bed | Lay 2-3 inches of gravel in trench bottom | Drainage, support | Clean gravel, 3/4-1 inch |
| Lay pipe | Place drain tiles end-to-end | Collect water | Gaps between tiles allow water entry |
| Cover | Gravel over and around pipe | Filter, protect | 4-6 inches of gravel around pipe |
| Backfill | Fill trench with soil | Restore grade | Mound slightly (settles) |

### Chapter 5: Kiln Firing for Pipes

| Temperature | Result | Porosity | Strength | Use |
|---|---|---|---|---|
| 1600-1800°F (low fire) | Terracotta | Porous | Moderate | Drain tile, flower pots |
| 1800-2100°F (mid fire) | Stoneware | Low porosity | High | Water pipe, sewer |
| 2100-2300°F (high fire) | Vitrified | Nearly waterproof | Very high | Pressure pipe, chemical |
| Salt-glazed (any temp + salt) | Glazed surface | Waterproof | High | Sewer, water pipe |

### Reference Card

1. Clay pipes last centuries underground (clay is chemically inert and does not corrode; clay sewer pipes installed in the 1800s are still functioning today). 2. The bell end receives the spigot (every pipe has a flared end that receives the plain end of the next pipe; water flows from spigot to bell, which means from uphill to downhill). 3. Drain tiles have intentional gaps (field drainage tiles are laid end-to-end with small gaps; groundwater enters through the gaps and flows to the outlet). 4. Slope is critical (pipes must slope continuously downhill; a minimum slope of 1 inch per 8 feet ensures water flows and solids do not settle). 5. Gravel surrounds the pipe (a gravel bed and cover around drain tiles filters soil particles and prevents clogging; without gravel, soil enters the gaps and blocks the pipe). 6. Higher firing means lower porosity (pipes fired to higher temperatures are denser and less porous; water supply pipes must be fired to stoneware temperature or higher). 7. Salt glazing creates a waterproof surface (throwing common salt into the kiln at peak temperature creates a glassy surface on the pipe; this is the traditional method for sewer and water pipes). 8. Clay pipe making is one of the oldest technologies (clay pipes for water and drainage have been found in archaeological sites dating to 4000 BCE; the technology is proven over six thousand years).