Nuclear Grade Gasket - Binzhou Double Peaks Graphite Sealing Materials https://www.bz-graphite.com/en/product-category/nuclear-grade-gasket-en/ High quality graphite sealing materials Mon, 25 Jun 2018 08:28:59 +0000 en-US hourly 1 https://wordpress.org/?v=6.9 https://www.bz-graphite.com/wp-content/uploads/2017/12/ico-152x152-100x100.png Nuclear Grade Gasket - Binzhou Double Peaks Graphite Sealing Materials https://www.bz-graphite.com/en/product-category/nuclear-grade-gasket-en/ 32 32 Nuclear Grade Gasket Classification https://www.bz-graphite.com/en/product/nuclear-gasket-classification/?utm_source=rss&utm_medium=rss&utm_campaign=nuclear-gasket-classification Thu, 31 May 2018 07:35:02 +0000 http://bz-graphite.com/product/nuclear-gasket-classification/ Nuclear Grade Gasket Classification encoding Product Name encoding Product Name DP1106 Nuclear Grade Graphite Coil/Plate DP3200N Nuclear Grade Graphite Composite Gasket DP1200N Nuclear Grade Graphite Strips DP3400N Nuclear grade metal ...

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]]> Nuclear Grade Gasket Classification
encoding Product Name encoding Product Name
DP1106 Nuclear Grade Graphite Coil/Plate DP3200N Nuclear Grade Graphite Composite Gasket
DP1200N Nuclear Grade Graphite Strips DP3400N Nuclear grade metal spacer
DP2000N Nuclear Grade Graphite Filler DP3520N Nuclear-grade PTFE gaskets
DP3000N Nuclear-Grade Graphite Wraps DP3540N Nuclear grade non-asbestos gasket
DP3100N Nuclear Grade Graphite Wound Gasket DP3660N Nuclear Grade Graphite Gaskets

Nuclear Grade Gasket Applications

Classification Use Case Useful range
DP2200N graphite filler ring Working pressure ≤43.1MPa Mainly used for seals in petroleum, chemical, thermoelectric, nuclear power and general industrial valve pumps, expansion joints and other parts. It is used in stem sealing of low leakage rate shut-off valves, isolation valves and regulating valves of nuclear power plants. The two are often used in combination.
DP2300N Disk Roots Working temperature -200-650°C
DP3100N Graphite Spiral Wound Gasket Working pressure ≤42MPa Mainly used for sealing of pumps, valves, heat exchangers, pipe flanges, etc. Nuclear power plants are used to seal 1, 2 and 3 safety grade industrial and instrument pipeline flanges and valve bodies of nuclear steam supply systems.
Working temperature -200-650°C
DP3200N Graphite reinforced gaskets Working pressure ≤20MPa Mainly used for processing into high-strength gaskets, cylinder gaskets, intake and exhaust pipe gaskets. Applicable to acid, alkali, steam, various solvents and oils and other media.
Working temperature -200-650°C
DP3400N Metal Gasket Working pressure 2.0-42MPa is usually applied to high pressure steam, gas, solvent and other devices such as high pressure vessels, high pressure valves, etc.
DP3520N PTFE gasket Working pressure 2.0-6.3MPa Widely used in petroleum, chemical, thermal, gas, nuclear energy, aerospace, textile, pharmaceutical and other industries, equipment, process piping and other static sealing parts.
Working temperature ≤260°C
DP3660N Nuclear Grade Graphite Gaskets Working pressure 150-2500LB 1,2,3 Safety Level Process, Instrumentation Line Flanges, Valve Body Seals, and Evaporator Primary and Secondary Sides and Regulator Manholes or Hand Hole Flanges for Nuclear Steam Systems seal.
Working temperature ≤650°C

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]]> Nuclear grade graphite gasket https://www.bz-graphite.com/en/product/dp3660n/?utm_source=rss&utm_medium=rss&utm_campaign=dp3660n Thu, 29 Mar 2018 03:57:54 +0000 http://bz-graphite.com/product/dp3660n/ General Features

Nuclear grade graphite gasket consists of three parts: outer ring, seal ring and inner ring. When the gasket is working, the flange metal surface is always in contact with the gasket limiting ring, and the sealing stress is kept constant during sealing service. The deformation of the flange is reduced, and the sensitivity of the sealed coupling part to external bending moment, temperature and pressure changes is ensured. The sealing system is continuously safe, effective and reliable. Applicable to boron-containing water, cooling water, steam, demineralized water, oil, air, nitrogen, oxygen, 30% sodium hydroxide solution, 7% nitric acid solution and other media.

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]]> Product Specifications

Nominal diameter: 1/2′′～28

Technical Parameters

Test item Unit Value
Compensation rate % 18～27
Rebound rate % ≥20
stress relaxation rate % ≤10
Seal Leakage Rate Pa.m3/s(helium gas) ≤1.0×10-6

Applications

Working temperature: -200°C~600°C
Working pressure: ≤50MPa

Usage

Applicable to nuclear power supply system 1,2,3 safety level process, instrumentation line flange, body seal, and vaporizer primary and secondary sides and regulator manhole or hand hole seal.

Gasket Structure

The graphite gasket consists of a metal inner ring, a graphite ring, and a metal outer ring. The middle of the gasket is a high-purity expanded graphite ring.

Structure Diagram

Gasket Size

The graphite gaskets for flange seals match the flange sizes of ASME B16.5 and ASME B16.36. For non-standard flanges and the implementation of other standard flanges, the gaskets also determine the gasket size according to the flange requirements.
The gasket size d1 is matched with the inner hole of the flange. Between d2 and d3 is the effective sealing surface of the gasket. d4 should be smaller than the diameter of the center circle of the flange bolt hole minus the diameter of the bolt hole.

DN d1 d2 d3 e E d4
CL
150		 CL
300		 CL
600		 CL
900		 CL
1500		 CL
2500
15 17
（15）		 23 31 4.4 3.2 46 52 52 62 62 69
20 23.7
（21）		 30 38 4.4 3.2 56 66 66 69 69 75
25 29.7
（27）		 36 48 4.4 3.2 66 73 73 78 78 84
40 50.7
（42）		 57 69 4.4 3.2 84 94 94 97 97 116
50 65.7
（56）		 72 84 4.4 3.2 100 107 107 139 139 141
65 76.7
（67）		 83 95 4.4 3.2 119 127 127 160 160 163
80 90
（83）		 99 115 4.4 3.2 132 146 146 166 170 192
100 110
（99）		 119 135 4.4 3.2 170 178 190 203 205 231
125 140
（8.210.33.29）		 149 165 4.4 3.2 194 213 237 244 250 276
150 161 174 194 4.4 3.2 219 248 262 285 280 312
200 212
（205）		 225 245 4.4 3.2 276 304 316 354 348 382
250 265 285 305 6.6 5 336 357 396 431 430 471
300 318
（308）		 338 358 6.6 5 406 418 453 494 515 543
350 350 380 402 6.6 5 446 481 490 517 575
400 407 431 461
（456）		 6.6 5 510 535 561 571 637
450 454 484 514 10 8 545 592 609 634 698
500 508
（500）		 538 576 10 8 602 650 679 695 752
600 610
（606）		 642 682 10 8 713 771 786 833 896

The values ​​in brackets are 1500 lbs and 2500 lbs.

Dimensional Deviation

Diameter limit deviation (unit: mm)

Nominal diameter DN (mm) Graphite Ring Inner and Outer Rings
D2 D3 D1 D4
≤200 ±0.3 ±0.3 +0.5
0		 0
-0.8
250-600 ±0.5 ±0.5 +0.8
0		 0
-1.3

Thickness limit deviation (unit: mm)

Graphite Ring Limit deviation
Thickness(T) Limit deviation DN Inner Ring Outer ring
4.0-5.0 ±0.22 ≤200 +0
-0.10		 +0.10
-0.05
6.0 to 10.0 ±0.22 200<DN≤600 +0
-0.15		 +0.15
-0.10

Metal ring flatness: 0.1mm (DN≤200); 0.2mm (200<DN≤600)

Appearance quality

No defects, such as scratches, voids, irregularities, and rust spots, which affect the sealing performance, are allowed on the upper and lower surfaces of the graphite ring of the gasket.
The surface of the inner ring and the outer ring shall have no defects such as burrs, uneven or rusty spots; the distances between the upper and lower sealing surfaces of the graphite ring of the gasket and the upper and lower surfaces of the ring shall be equal; the graphite ring shall be fixed between the inner ring and the outer ring; Allow loosening.

Gasket Advantage

Items

Graphite Gaskets
Principles of sealing Metal-touch-metal design concept, the gasket stress is kept constant during the sealing service period, so as to ensure the continuous and effective sealing process.
Sensitivity of thermal shock and pressure fluctuations Constantly maintain gasket pressure during initial design
Anti-fatigue failure The pure graphite ring is assembled between two metal rings, the limit ring is subjected to normal stress, and the stress value is far less than the elastic limit of the material, so no fatigue failure occurs.
Overall stiffness Using metal-impact-metal design, the overall stiffness of flanges and gaskets has been greatly enhanced
Installation requirements Metal-touch-metal design allows overloading
Effects on Spouse Flanges Long-term use without damage to the flange surface

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