Standard drip irrigation tape comes in two configurations that differ only in the spacing between emitters: 20 cm and 30 cm, both in 500 m rolls with a 16 mm diameter, 0.3 mm wall thickness (gauge 120) and an emitter flow rate of 1.6 L/h at 1 bar. The choice between 20 and 30 cm determines how much water per hour the system releases, the maximum lateral length you can install and how well it matches the actual spacing of your crop. This comparison helps you choose the right configuration based on your planting geometry and available pumping capacity.
🎯 Choose the variant in 10 seconds
- If your case is a dense or continuous crop (lettuce, strawberry, onion, leafy vegetable): go to the 20 cm emitter spacing configuration
- If your case is a spaced crop or long laterals (tomato, pepper, corn, in-line planting): go to the 30 cm emitter spacing configuration
What to consider before choosing the variant
Both variants share the material (polyethylene with UV resistance), diameter (16 mm), wall thickness (0.3 mm / Ga 120), emitter flow rate (1.6 L/h), emitter type (turbulent-flow labyrinth, anti-clogging), required filtration (120 mesh / 130 micron) and standard (ISO 9261:2004). The difference lies only in the emitter spacing, which changes the total flow of the roll and the maximum lateral length:
- Crop density: in rows with plants every 15–20 cm (lettuce, onion, strawberry) the 20 cm emitter spacing option waters close to each plant. In more widely spaced crops (tomato every 30–40 cm, pepper every 40 cm) the 30 cm option reduces the overlap of wetted bulbs without losing coverage.
- Total system flow: the 20 cm roll releases 4,000 L/h over its 500 m; the 30 cm roll releases 2,667 L/h. If your pump or water supply is limited, the 30 cm option lowers demand and lets you irrigate more area per cycle.
- Maximum lateral length: on flat terrain and at 1 bar, the 20 cm option withstands up to 72 m per line; the 30 cm option up to 93 m. If your plot has long runs with no way to subdivide, the 30 cm option reduces the number of laterals and connections required.
- Soil type and lateral water movement: in sandy soils water descends quickly and spreads little laterally; 20 cm is advisable to avoid dry zones between emitters. In clay soils water spreads widely laterally; with 30 cm the bulbs still overlap and perform the same with fewer emitters.
- Filtration and maintenance: both variants require a 120 mesh (130 micron) filter at the head. The turbulent labyrinth emitter is anti-clogging, but filtration is essential; without it, the emitters clog and the tape loses flow uniformity.
20 cm emitter spacing configuration: the dense one for vegetables and tightly spaced row crops
- 2,500 emitters per roll: uniform coverage
- Ideal for dense crops or sandy soil
- Overlapping wetted bulbs with no dry zones
- Same anti-clogging emitter with 120 mesh filter
- High total flow: 4,000 L/h per roll
- Shorter maximum lateral: 72 m on flat ground
- Oversized for widely spaced crops
The 20 cm configuration is the standard option for horticultural crops in tight rows or continuous coverage: lettuce, strawberry, onion, spinach, carrot, garlic, aromatic herbs. Its density of 2,500 emitters per roll ensures that each plant or stretch of line receives water with no dry gaps in between, especially important in sandy soils where water moves vertically with little lateral movement. For large plots with this tape, divide the laterals into 60–70 m sections and connect them through a central manifold.
30 cm emitter spacing configuration: the spaced one for in-line crops and long laterals
- Lower total flow: 2,667 L/h per roll
- Longer maximum lateral: 93 m on flat ground
- Ideal when pumping is limited
- Sufficient in clay soil thanks to lateral movement
- Insufficient for dense crops in sandy soil
- Risk of dry zones between emitters if the crop does not match
The 30 cm configuration is the preferred option when the crop is widely spaced or when pumping is limited: tomato, pepper, corn, watermelon, melon, zucchini, young tree plantings in line. Its 1,667 emitters per roll lower the water demand to 2,667 L/h, which lets you irrigate more area with the same pump. The maximum lateral length of 93 m makes it the natural choice for long plots or greenhouses with extensive aisles.
Variant comparison table
Both variants share all construction and emitter characteristics. The difference lies only in the spacing and, therefore, in the total flow of the roll and the maximum lateral length.
| Characteristic | 20 cm between emitters | 30 cm between emitters |
|---|---|---|
| Ideal use | Dense vegetables and sandy soil | In-line crops and long laterals |
| SKU | 299533 | 936734 |
| Diameter | 16 mm (5/8 in) | 16 mm (5/8 in) |
| Wall thickness | 0.3 mm (Ga 120) | 0.3 mm (Ga 120) |
| Spacing between emitters | 20 cm (8 in) | 30 cm (12 in) |
| Flow per emitter (@ 1 bar) | 1.6 L/h (0.42 gph) | 1.6 L/h (0.42 gph) |
| Emitters per roll | 2,500 | 1,667 |
| Total flow of the roll | 4,000 L/h (1056.7 gph) | 2,667 L/h (704.6 gph) |
| Maximum lateral length (flat) | 72 m (236 ft) | 93 m (305 ft) |
| Roll length | 500 m (1640 ft) | 500 m (1640 ft) |
| Working pressure | 1 bar (14.5 psi) | 1 bar (14.5 psi) |
| Pressure range | 0.3–1 bar | 0.3–1 bar |
| Material | High-quality UV PE | High-quality UV PE |
| Emitter type | Turbulent labyrinth | Turbulent labyrinth |
| Required filtration | 120 mesh (130 µm) | 120 mesh (130 µm) |
| Production standard | ISO 9261:2004 | ISO 9261:2004 |
Use case → recommended variant matrix
| If your case is… | Recommended variant |
|---|---|
| Lettuce, strawberry, onion, vegetables in tight rows | → 20 cm |
| Sandy soil with little lateral water movement | → 20 cm |
| Nurseries or continuous-coverage beds | → 20 cm |
| Tomato or pepper with plants every 30–40 cm | → 30 cm |
| Corn, watermelon, melon or zucchini in line | → 30 cm |
| Limited pumping or long laterals in an extensive plot | → 30 cm |
Before fixing the spacing, measure the width of the wetted bulb produced by a single emitter in your soil. Do this by irrigating for 30 minutes at nominal pressure and measuring the diameter of the wet patch at the surface and at 10–15 cm depth. The rule of thumb is that the spacing between emitters should not exceed the bulb diameter at the surface: in clay soil a 40–50 cm bulb makes the 30 cm option more than enough; in sandy soil a 20–30 cm bulb requires 20 cm tape so the bulbs overlap. This initial measurement avoids buying the wrong tape for hundreds of meters of crop.
Do not install standard drip tape without a 120 mesh filter at the irrigation head. Although the turbulent labyrinth emitter is anti-clogging, particles larger than 130 micron (fine sand, well sediment, organic debris) eventually clog it and reduce flow to the point of leaving part of the crop without water. A 120 mesh screen filter with periodic cleaning multiplies the service life of the tape and maintains discharge uniformity from the first to the last meter of the lateral.
Frequently asked questions
How many rolls do I need for my plot?
Calculate the total sum of meters of tape line to install (number of lines × length of each line) and divide it by 500 m per roll. Example: a 50 m × 30 m plot with lines spaced 80 cm apart → 38 lines × 50 m = 1,900 total m → 4 rolls. Add a 5–10% margin for connections, elbows and cuts at the headers.
Standard or pressure-compensating: which do I choose?
Use standard tape (this product) on flat plots or those with minimal slopes, where pressure is uniform along the lateral. Use pressure-compensating tape on sloped terrain, very long laterals or when you need an identical flow at the first and last emitter. The pressure-compensating type maintains a constant flow over a wide range of pressures (typically 0.5–3 bar) and eliminates friction losses along the lateral.
Can the tape be buried?
Yes, it can be buried shallowly (3–5 cm below the surface) in semi-permanent systems to reduce evaporation and protect the tape from the sun. For deep burial or permanent systems (more than one cycle), it is advisable to use thicker drip lines (16 mm with 1.0 mm wall) or systems specific to burial. Gauge 120 tape (0.3 mm) is an economical option for seasons, not for prolonged burial.
