TYCO Series DS-2 (datasheet TFP530) are dry pendent sprinklers with a K 11.2 discharge coefficient, quick or standard response, per listing and installation and standard coverage, operated by a glass bulb. They are designed for dry pipe systems exposed to freezing where a pendent is required, such as drops from unheated portions of buildings. The series has 2 models; each has a Sprinkler Identification Number (SIN) that fixes its orientation, K-factor and thread, and the sprinkler is ordered by that number. The models table at the top of this page lists them all; for where the sprinkler sits in the whole system, see the complete guide to sprinkler systems in Saudi Arabia.
In short
- Models: TY5235, TY5255.
- Orientations: Dry Pendent.
- K-factor: K 11.2; thread: 1″ NPT.
- Glass bulb, response per model.
- Temperature ratings: 68 / 79 / 93 / 141 / 182 °C.
- Maximum working pressure: 175 psi (12.1 bar).
- Series approvals: UL, C-UL (per Table A). The approval of each model, finish and rating is in the approvals table of datasheet TFP530.
How this sprinkler works
The glass bulb contains a fluid that expands when exposed to heat. When the rated temperature is reached, the fluid expands enough to shatter the bulb, the sprinkler opens and the deflector spreads the water over the fire area.
In a dry-type sprinkler a plug with sealing assembly at the inlet keeps water out of the sprinkler barrel while in service. When the element operates, the seat is released and a spring drives the plug clear, so water enters and discharges. The barrel extending into the cold area therefore stays free of water.
Dry Pendent: A dry-type sprinkler installed pendent, with its barrel extending into the area exposed to freezing.
The response rating of this sprinkler depends on coverage area and installation, per the datasheet table.
How to choose the model
- Orientation: Dry Pendent — A dry-type sprinkler installed pendent, with its barrel extending into the area exposed to freezing.
- K-factor: K 11.2 for every model in the series.
- Thread: usually follows the K-factor, and must match the fitting on the system.
- Temperature rating and finish: stated with the order for each model, from the highest expected ceiling temperature and the environment.
Application notes
- Inlet 1″ NPT or ISO 7-R 1; K 11.2 for higher density at lower pressure.
Technical data
| Item | Value |
|---|---|
| Models (SIN) | TY5235, TY5255 |
| Orientations | Dry Pendent |
| Discharge coefficient | K 11.2 (161.4 L/min/bar½) |
| Thread | 1″ NPT |
| Element | Glass bulb |
| Response | Per model |
| Coverage | Standard Coverage |
| Temperature ratings | 68 / 79 / 93 / 141 / 182 °C |
| Maximum working pressure | 175 psi (12.1 bar) |
| Installation torque | 20 – 30 lb-ft (26.8 – 40.2 N·m) |
| Wrench | W-Type 17, or a pipe wrench on the inlet band or casing |
| Approvals | UL, C-UL (per Table A) |
| Datasheet | TYCO TFP530 |
The critical point: fitting and exposed length
A dry-type sprinkler must be installed only in the fittings listed in the datasheet’s Design Criteria. On wet systems the exposed barrel length in the warm area must meet the minimum in the table for the protected-area temperature.
Installation steps
- Inspect before installing: never install a sprinkler whose bulb is cracked or has lost liquid.
- Confirm the fitting is one of the types listed in the datasheet’s Design Criteria section.
- Install each sprinkler in the correct orientation for its model, as shown in the datasheet — never reversed.
- Apply pipe-thread sealant to the threads, then hand-tighten the sprinkler.
- Finish with the specified wrench (W-Type 17, or a pipe wrench on the inlet band or casing) within the torque for the model’s thread: 20 – 30 lb-ft (26.8 – 40.2 N·m). Higher torque can distort the inlet and cause leakage.
Common mistakes
- Installing the dry sprinkler in an unlisted fitting, or with less than the minimum exposed length in the table, so water freezes inside the barrel.
- Installing a sprinkler that was dropped, struck or slipped by the wrench. The datasheet requires any such sprinkler to be replaced.
- Painting or coating sprinklers on site. Sprinklers must not be altered after leaving the factory; altered sprinklers are replaced.
- Hanging objects from sprinklers, or cleaning them with anything other than a gentle feather duster.
Maintenance
Sprinklers that leak or show visible corrosion must be replaced, as must sprinklers exposed to corrosive products of combustion that cannot be fully cleaned. The owner is responsible for inspection, testing and maintenance to NFPA 25 and the authority having jurisdiction, preferably by a qualified inspection service. Before closing a main control valve for maintenance, obtain permission from the proper authorities and notify everyone affected.
Files and ordering
TYCO datasheet TFP530 and the available approval certificates are in the files section of this page. When ordering, state for each line the model (SIN), temperature rating and finish, and the required length. The datasheet lists the part numbers (P/N) for each combination.
How to order
Use the “Build your order” section on this page: add every model and quantity, then send the whole order by email or WhatsApp. It reaches us as a tidy PDF request sheet and we contact you with the quotation.
FAQ
What do model numbers such as TY5235 mean?
They are TYCO Sprinkler Identification Numbers (SIN). Each identifies an exact model — orientation, K-factor and thread. The sprinkler is ordered by this number together with temperature rating and finish.
How do I choose the temperature rating?
From the highest expected ceiling temperature and the rating classes in the project’s governing standard, within the ratings available for the model in the datasheet.
Do all models in the series carry the same approvals?
Not always. The approvals table in datasheet TFP530 gives each model’s approvals by rating and finish, so check it when the project requires a specific approval.
Why a dry-type sprinkler rather than a standard one?
The barrel extending into the cold area stays free of water until operation, so it cannot freeze, while the water stays in the heated part of the system.
References
- TYCO TFP530 — Series datasheet (attached)
- NFPA 13 — Standard for the Installation of Sprinkler Systems
- NFPA 25 — Inspection, Testing and Maintenance of Water-Based Fire Protection Systems
- TYCO TFP700 — Installer warning for handling and installing sprinklers
This page is general information to help with selection and ordering, taken from the attached TYCO datasheet. Final design is set by the project’s approved designer; the project specification, the consultant’s drawings and the latest datasheet revision govern.
