Bronze Fusible Plug

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Bronze Fusible Plug Specification

Valve Type
Safety Valve / Fusible Type

Features
Automatic release; Corrosion resistance; Thermal protection

Valve Size
1/2 inch

Control System
Thermal Fuse Activated

Material
Bronze Body with Fusible Alloy Core

Connection Type
Screwed (Threaded)

Sealing
Metal to Metal Sealing with Fusible Alloy

Application
Boiler Safety Device

Type
Fusible Safety Plug

Pressure
Up to 17.5 kg/cm² (250 psi)

Media
Steam / Water

Port Size
1/2 inch BSP

Temperature
Fuse melts at 220°C (428°F) or specified rating

Pin
Single Central Pin

Bronze Fusible Plug Trade Information

Supply Ability
10 Per Month

Delivery Time
2 Week

Sample Available
Yes

Sample Policy
Contact us for information regarding our sample policy

Packaging Details
cartons boxes/ wooden boxes

Main Domestic Market
All India

Certifications
ISO- 9001, 2000 BIS

Bronze Fusible Plug About

Bronze Fusible Plug

Boss Bronze Fusible Plugs are manufactured in two designs namely one piece and two piece designs. These are suitable for 250 PSIG (17.58 kg/cm² ) Max. Boiler operating pressure and max. temp up to 428^oF (220^oC). Tested to 500 PSIG (35.15 kg/cm²g) Hydraulic pressure.

Type 1:One piece Design

This design has one piece Bronze body filled with fusible alloy having male BSPT threads. It is manufactured in 15mm (1/2") 20mm (3/4") and 25mm (1") sizes.

Type 2: Two Piece Design

This design has a replaceable cone containing fusible alloy screwed in to Bronze body, having male BSPT Threads. It is manufactured in 15mm (1/2"), 20mm (3/4"), 25mm (1"), 32mm (1 1/4"), 40mm (1 1/2") and 50mm (2) sizes.

Dimensions

Nominal Size	A	B	A1	B1
15 mm (1/2")	53.0	15.0	32.0	8.0
20 mm (3/4")	58.0	20.0	38.0	8.0
25 mm (1")	70.0	20.0	45.0	9.5
32 mm (1 1/4")	75.0	25.0
40 mm (1 1/2")	82.0	30.0
50 mm (2")	100.0	32.0

Materials

Bodies and covers are made of Bronze conforming to IBR 282 (a) (IV) Gr. B. Fusible is specially prepared to meet requirements of Indian Boiler Regulations.

Thermal Protection and Automatic Release

This fusible plug is engineered for critical thermal protection in steam boilers and pressure vessels. Its central fusible alloy melts when exposed to dangerous temperature levels, ensuring a rapid and automatic release to maintain system safety. The metal-to-metal seal further guarantees leak-proof performance.

Standards and Specifications

Complying with IS:3224 and featuring BSP threads as per IS:554, this device is rigorously pressure-tested at 1.5 times its rated working pressure. Its construction includes a robust bronze body and corrosion-resistant properties, making it tailored for demanding industrial environments.

Easy Installation and Application

Recommended for vertical mounting, the fusible plug utilizes a threaded (screwed) connection, simplifying installation into steam boilers or pressure vessels. Its 1/2 inch BSP size is widely compatible, providing efficient integration into a variety of industrial safety systems.

FAQs of Bronze Fusible Plug:

Q: How does the bronze fusible plug enhance boiler safety?

A: The plug uses a central fusible alloy core that melts at a preset temperaturetypically 220Cautomatically releasing pressure to prevent overheating or rupture in steam boilers and pressure vessels.

Q: What process ensures the reliability of the fusible plug under pressure?

A: Each plug undergoes rigorous testing at 1.5 times its working pressure to ensure high reliability and safety performance in real-world operating conditions.

Q: When should I replace the fusible plug in my boiler system?

A: Replacement is usually advised after the plug has been activated (i.e., after alloy melting during an overheat event), or periodically as part of scheduled boiler maintenance, depending on manufacturer or regulatory guidelines.

Q: Where is the recommended installation position for the plug?

A: The bronze fusible plug is designed for vertical mounting, which is typically specified by safety standards and ensures its optimal response during overheating scenarios.

Q: What are the benefits of using a bronze body with a fusible alloy core?

A: The bronze body offers excellent corrosion resistance and mechanical strength, while the fusible alloy core ensures precise thermal activation, collectively maximizing safety and durability.