Boiler Sealing Iron Flexible Graphite Sealing Iron Metal Coating Sealing Gasket High Pressure High Temperature Sealing Petrochemical Industrial Boiler Parts

Product Introduction

               The sealing iron (also known as sealing gasket iron or sealing iron sheet) in boiler accessories is a sealing element used for key connection parts (such as manholes, handholes, flanges, valves, etc.) in boiler systems. Its main function is to prevent medium (steam, water, or flue gas) leakage and ensure the safe and efficient operation of the boiler.

Product parameters

product name	Boiler accessory sealing iron
material	Heat-resistant Steel,Cast Iron,Cast Steel,Mild steel,Carbon Steel,Alloy Steel, etc.
Material standards	ASTM,AISI,ASME,SAE,NF EN,DIN EN,ISO,BS EN,ss,etc
port	Qingdao Port, Tianjin Port, Guangdong Port.china
delivery time	7-15 days
country of origin	Shandong, China
Specification drawing software	PDF, Auto CAD,Solidworks,JPG, ProE,etc.
productivity	50000 tons /year
package	Wooden package after mandatory treatment or other
PRODUCT MODEL	MG MG-450 SG SG-220 φ200mm φ300mm φ450mm φ500mm 5mm~20mm JB/T 87-2015 ASME B16.20 CG-150 VG-10 DN50 DN100 PG-1.6 HG-6.4 YG-16 JB/T 88-2015 ASME DIN 2690B16.20 JIS B 2404
Is it customized	customized
Payment Method	TT LC
Standard	Ht150
Material	Cast Iron,Cast Steel,Mild Steel,Carbon Stee
Price Ter	EXW FOB CFR CIF DDP
Application scope	Industrial Life  Power station
type	Sprocket

Company Profile

               Shandong Jiaguang International is a high-tech enterprise with 30 years of experience in boiler component manufacturing. It has always adhered to the integrated development of R&D, production, sales and technical services. The company has a modern intelligent production base and a professional engineering team of more than 100 people, forming four core product portfolios: high temperature resistant grate system (including active, passive, scale type, reciprocating type), intelligent chain transmission components (including chain rods, scraper conveyor components and sinking scraper chains), precision gas cap devices (boiler gas caps and grates), special pipe solutions (boiler tubes, square tubes and pressure gears), forming a complete boiler component ecosystem.

The company is well-known throughout the country for its excellent product quality and maintains strategic partnerships with the top 15 industrial boiler manufacturers in China, including Harbin Boiler Plant, Dongfang Electric Group, Shanghai Boiler Plant, Jinan Boiler Group, Hangzhou Boiler Group, etc. The company has passed ISO9001 international quality management system certification, CE, SGS certification, and has formed a global service network covering eight major industries such as power generation, thermal energy, papermaking, and chemical industry. The products have been successfully exported to more than 30 countries and regions in Southeast Asia, Central Asia, Oceania, Africa, etc.

As a pioneer in technological innovation in the industry, Shandong Jiaguang International continues to provide full life cycle solutions for global industrial boilers, power plant boilers, and civil heating systems. By continuously improving its R&D capabilities and service system, the company is steadily moving towards becoming a global boiler parts technology benchmark and professional solution provider, and is committed to creating outstanding value for global customers by improving service experience.

Product Certification

Product packaging

 Packaging specifications and requirements for boiler sealing iron

As a key sealing component of boilers, the packaging of sealed iron must ensure zero damage, corrosion, and confusion during transportation and storage. The following is a professional packaging solution:

1、 Selection of Packaging Materials

Packaging parts, recommended materials, and functions

Inner packaging: rust proof oil paper/VCI vapor phase rust proof film, anti oxidation, anti fingerprint pollution

Middle layer: pearl cotton/EVA foam (5mm thick), cushioning and shock-absorbing

Outer packaging: Steel wood composite box/moisture-proof corrugated cardboard box, pressure resistant and moisture-proof

Corner protection: Plastic corner protection (PP material) to prevent the box from being bumped

2、 Classification Packaging Standards

1. Small sealing iron (＜ 5kg)

Single piece packaging:

-Vacuum aluminum film sealing → Foam positioning → Cardboard separation

2. Large sealing iron (such as manhole sealing ring)

Customized packaging:

-Steel tray+detachable steel strip bundling

-Arc shaped support frame protects the sealing surface

Anti deformation measures: When the diameter of the sealing iron is greater than 500mm, a cross support frame must be installed, and stacking more than 2 layers is prohibited.

3. High precision sealing iron (± 0.05mm tolerance)

-Constant temperature and humidity packaging (25 ℃± 2 ℃, RH40%）

-Equipped with desiccant (3 times the regular dosage)

3、 Special working condition packaging

Working condition requirements, packaging scheme, and execution standards:

Sea freight export: Container desiccant+salt spray protective coating ASTM D3951

Extreme cold regions (<-30 ℃): wrapped in insulation cotton and tested for antifreeze according to GOST 15150 standards

Sealed iron for nuclear power plants: double-layer lead shielding packaging+radiation monitoring label ASME NQA-1

Product transportation
Transportation mode selection
1. Shipping by sea
Suitable for bulk accessories such as steel plates and large pipelines, pay attention to container size (20GP/40HQ) and load balance.Sea freight requires anti salt spray treatment, with moisture-proof agents placed inside the container and sealed.

2. Land transportation
Heavy accessories (over 3 tons) require flatbed trucks or low chassis vehicles, and routes should be planned in advance to avoid height/weight restrictions.Cross border transportation inspection of various countries' requirements for wooden packaging (such as ISPM15 fumigation certificate).

3. Air freight
Urgent small items (electronic controllers) should be prioritized for air transportation, and the weight of each item should be controlled (usually<100kg) to reduce packaging weight and save costs.

FAQ:

Frequently Asked Questions about Boiler Sealing Iron (Q&A)

Q1： Why does the newly installed sealing iron still leak?

A1：

-Possible reasons:

1. There are impurities on the sealing surface during installation (such as iron filings and welding slag)

2. Uneven pre tightening force of bolts

3. Uneven flange surface (flatness exceeding the standard)

4. Selection error (pressure rating mismatch)

-Solution:

1. Thoroughly clean the sealing surface

2. Use a torque wrench to tighten in a cross pattern order

3. Check the flatness of the flange (should be ≤ 0.05mm)

4. Confirm the sealing iron material and pressure rating

Q2： Common manifestations of sealing iron failure under high temperature conditions**

A2：

-Typical manifestations:

1. Metal creep deformation (deepening of indentation)

2. Oxidative corrosion (appearance of rust pits on the surface)

3. Stress relaxation (decrease in bolt preload)

4. Radial cracks appear on the sealing surface

-Preventive measures:

1. Choose heat-resistant alloy materials (such as Inconel 600)

2. Regularly check the fastening status

3. Set a reasonable replacement cycle

Q3： How to correctly measure the size of the sealing iron?

A3：

-Key measurement items:

1. Inner/outer diameter (using a digital caliper)

2. Thickness (measured at multiple points with a micrometer)

3. Flatness (check with a feeler gauge on the platform)

4. Tooth height of toothed pad (special depth gauge)

-Attention:

1. Clean the surface before measurement

2. Avoid edge chamfer positions

3. Record the maximum and minimum values

Q4： What is the standard tightening sequence for installing sealed iron?

A4：

-Standard process:

1. Manually pre tighten all bolts (confirm alignment)

2. Tighten in diagonal order three times:

-First time: 30% rated torque

-Second time: 60% rated torque

-Third time: 100% rated torque

3. Re tighten after hot operation

-Illustration:

①→③→⑤→⑦

↖↙↖↙

②→④→⑥→⑧

Q5： How to determine if the material of the sealing iron meets the requirements?

A5：

-Identification method:

1. Spectral analysis (most accurate)

2. Density testing (different materials have different densities)

3. Hardness testing (Brinell hardness tester)

4. Chemical reagent spot testing (requires professional personnel)

-Common material parameters:

|Material | Density (g/cm ³) | Hardness (HB)|

|---|---|----|

| Q235 | 7.85 | 120-150 |

| 304 | 8.0 | 150-200 |

| 316 | 8.0 | 160-220 |

For more detailed technical consultation, please feel free to contact our engineering team at any time!