SPIRAX SARCO · STEAM EQUIPMENT
Spirax Sarco SD Steam Distributor – Flash Steam Distribution for Feedwater Tanks
Spirax Sarco SD Steam Distributor for flash steam recovery in boiler feedwater tanks. Stainless steel, quiet operation, sizes DN40 - DN150.
Overview
The Spirax Sarco SD Steam Distributor is designed to distribute low-pressure flash steam into atmospheric water tanks, ensuring rapid condensation and efficient water heating. It is primarily used in boiler blowdown heat recovery systems to recover flash steam and preheat boiler feedwater.
The distributor features a progressive hole configuration that provides self-regulating control—holes come into operation sequentially as steam flowrate increases. An internal stainless steel mesh ensures quiet operation and eliminates waterhammer. The SD Steam Distributor is constructed entirely from austenitic stainless steel 304 for corrosion resistance and long service life.
This equipment is ideal for plants looking to reduce energy costs by recovering flash steam from blowdown operations. The recovered flash steam condenses to pure water, reducing make-up water requirements and chemical treatment costs.
Key Features
- Self-regulating hole configuration for progressive steam distribution
- Internal stainless steel mesh for quiet, waterhammer-free operation
- Full stainless steel 304 construction for durability and corrosion resistance
- Compact and lightweight design—no special supports required
- Available in screwed (BSP/NPT) and flanged (EN 1092 PN16 / ASME Class 150) connections
- Simple installation with low capital cost
- Maintenance-free operation
Specifications
| Parameter | Value | ||||
|---|---|---|---|---|---|
| Material | Austenitic Stainless Steel 304 | ||||
| Maximum Operating Pressure | 1 bar g | ||||
| Maximum Temperature | 130°C (saturated steam) | ||||
| Recommended Flash Vessel Pressure | 0.4 bar | ||||
| Screwed Connections | BSP (BS 21 parallel) or NPT | ||||
| Flanged Connections | EN 1092 PN16 or ASME Class 150 | ||||
| Model | Connection Type | Connection Size | Diameter (D) mm | Length (L) mm | |
| SD40S | Screwed | 1½" BSP/NPT Female | 100 | 70 | |
| SD50S | Screwed | 2" BSP/NPT Female | 150 | 85 | |
| SD80S | Screwed | 3" BSP/NPT Female | 215 | 110 | |
| SD80 | Flanged | DN80 PN16 / Class 150 | 215 | 180 | |
| SD100 | Flanged | DN100 PN16 / Class 150 | 235 | 210 | |
| SD150 | Flanged | DN150 PN16 / Class 150 | 305 | 220 | |
| Supply Pressure (bar g) | SD40S | SD50S | SD80S / SD80 | SD100 | SD150 |
| 0.2 | 99 | 176 | 396 | 643 | 935 |
| 0.4 | 135 | 240 | 540 | 877 | 1275 |
| 0.6 | 171 | 304 | 684 | 1111 | 1615 |
| 0.8 | 198 | 352 | 792 | 1287 | 1870 |
Applications
- Boiler blowdown heat recovery systems - Preheating boiler feedwater tanks - Flash steam recovery from condensate flash vessels - Atmospheric hot water storage tank heating - Industrial process water heating
Note: SD Steam Distributors are not recommended for condensate recovery or live steam injection duties due to potential waterhammer damage.
Frequently Asked Questions
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