ASME B16.20 SS304 SS316 Spiral Wound Gasket

• Customization: Available
• Type: Spring Washer
• Material: Stainless Steel
• Model NO.: KM-20230419
• Combination Washer Packaging: All Inclusive
• Spring Washer Type: Standard
• Standard: ASME B16.20
• Class: 150lb,300lb,600lb,etc
• Materials: AISI 304 AISI 316/PTFE
• Transport Package: in Carton or Wooden Cases.
• Specification: 1/2" TO 24"
• Trademark: KINGMETAL
• Origin: China
• HS Code: 8484100000
• Production Capacity: 1000 Tons Per Month

Product Description

ASME B16.20 SS304 SS316 Spiral Wound Gasket

Size:1/2"~24"
Standard: ASME B16.20
Class: 150LB,300LB,600LB,etc
Winding material: AISI 304 AISI 316/PTFE
Inner Ring Material: AISI 304 AISI 316
Outer ring Material: Carbon steel or stainless steel
Connection ends:flanges with a protrusion according to ASME B16.5

Class  150  NPS 1/2-24
NPS	Inner Ring	Sealing Element		Outer Ring
	Inside (d1) Diameter	Inside (d2) Diameter	Outside (d3) Diameter	Outside (d4) Diameter
1/2	14.2	19.1	31.8	47.8
3/4	20.6	25.4	39.6	57.2
1	26.9	31.8	47.8	66.8
1.1/4	38.1	47.8	60.5	76.2
1.1/2	44.5	54.1	69.9	85.9
2	55.6	69.9	85.9	104.9
2.1/2	66.5	82.6	98.6	124
3	81	101.6	120.7	136.7
4	106.4	127	149.4	174.8
5	131.8	155.7	177.8	196.9
6	157.2	182.6	209.6	222.3
8	215.9	233.4	263.7	279.4
10	268.2	287.3	317.5	339.9
12	317.5	339.9	374.7	409.7
14	349.3	371.6	406.4	450.9
16	400.1	422.4	463.6	514.4
18	449.3	474.7	527.1	549.4
20	500.1	525.5	577.9	606.6
24	603.3	628.7	685.8	717.6
NPS	Inside (d1) Diameter	Inside (d2) Diameter	Outside (d3) Diameter	Outside (d4) Diameter
	Inner Ring	Sealing Element		Outer Ring

General notes:

• Dimensions are in millimeters unless otherwise indicated.
• Image shows a Spiral Wound gasket with Inner - and Outer ring.
• d1 = Inside diameter when Inner ring is used.
• d2 = Inside diameter sealing element when no Inner ring is used.
• d3 = Outside diameter of sealing element.
• d4 = Outside diameter of Outer ring.
• Thickness of inner and outer ring: 2.97 mm - 3.33 mm.
• Thickness sealing element: 4.45 mm.
• Tolerance Outside diameter for NPS 1/2 through NPS 8 is ± 0.8 mm; for NPS 10 trough NPS 24 tolerance is + 1.5 mm - 0.8 mm.
• ASME B16.20 does not covers class 400 flanges up to NPS 3 and class 900 flanges up to NPS 2.1/2.
• There are no class 400 flanges NPS 1/2 thru NPS 3 (use Class 600), class 900 flanges NPS 1/2 thru NPS 2.1/2 (use Class 1500), or class 2500 flanges NPS 14 or larger.
• The inner ring inside diameters shown for NPS 1.1/4 thru 2.1/2 in class 1500 and 2500 will produce inner ring widths of 0.12 inches, a practical minimum for production purposes.
• ASME B16.20 which covers spiral wound gaskets requires the use of solid metal inner rings in: Pressure Class 900, nominal pipe sizes 24 and larger, Pressure Class 1500 from nominal pipe sizes 12 and larger, Pressure Class 2500 from nominal pipe sizes 4 and larger and all PTFE filled gaskets.

Spiral wound gaskets can be manufactured from various filler materials and assuming an appropriately rated metal winding strip is selected, the operating limits of available sealing materials are:
 

Sealing Layer Material	Minimum Temperature	Maximum Temperature	Maximum Pressure	Gas Tightness	Application
Graphite	-200°C	450°C	400 bar	Good	Aggressive Media
PTFE	-200°C	260°C	100 bar	Good	Aggressive Media
High Temp	-200°C	1000°C	5 bar	Average	Gases
High Temp + Graphite	-200°C	800°C	100 bar	Good	Gases

Whilst standard pipeline gaskets are available with a 4.5mm thick sealing element and 3.0mm thick inner and/or outer rings, other available sealing element thicknesses with guide diameters and recommended compression thicknesses are:

Sealing Element Thickness	Minimum Diameter	Maximum Diameter	Compressed Thickness
Graphite	-200°C	450°C	400 bar
PTFE	-200°C	260°C	100 bar
High Temp	-200°C	1000°C	5 bar
High Temp + Graphite	-200°C	800°C	100 bar