We Manufacture and supply high quality Ring joint Gaskets for high
pressure and temperature service conditions. These gaskets are
widely used in Refineries, Petrochemical Industries, Oil drilling
well head equipments, Pressure Vessels, valves, Christmas Tree
valves and Pipe lines. Ring joints Gasket are strictly manufactured
as per API-6A and ASME B16.20 specification.
We has more than 200,000 standard size ring joint gaskets in stock
and available for immediate shipment. These include all popular
sizes of “R”, “RX”, and “BX” style gaskets. Dan-Loc Group stocked
gaskets include Low Carbon Steel, F5, 304, and 316 materials.
The BX type RTJ gaskets are manufactured in accordance with API 6A
and are suitable for use in high pressure API 6BX flanges. The
gaskets form a metal to metal seal on assembly and the efficiency
improves as internal pressure increases. All BX sizes have a
pressure relief hole to equalize pressure across sealing faces.
Size Range :Available from Ring No. BX150 to RX 162 to suit the following
The API 6A ring gaskets for 6B flanges would be the R & RX
type, and for 6BX flanges, gaskets would be the BX types.
–NB1 11/16″ to 21 1/4″ Class Rating 5000 to 20000 ASME B16.20
» BX Ring gasket Suitable for use on API 6BX Flanges up to Class
» During installation the ring is compressed inwards to provide
additional sealing stress
» Pressure energised; as the internal pressure increases the
sealing force increases
» Type BX rings are supplied with pressure relief holes to avoid
compressing fluid beneath the gasket
» Can be drilled with additional hole to create a gasket suitable
for subsea installation Type “SBX”
As a result of metal to metal sealing media they are made to be
free of indentations, tool marks etc and have a surface finish of
BX – 32 microinches Ra (0.8 micrometer Ra)
Type BX operates in 20,000 psi with non interchangeability. Type BX
has a pressure passage hole for pressure equalization on each
sealing face sides.
The hardness of the ring gasket should always be 30% lesser than
the hardness of the flanges to prevent flange deformation
Dimensions and Tolerances for Ring Joint Gaskets and Grooves are
covered in API 6A and ASME B16.20.
Ring type joint gaskets(RTJs) are designed for high pressure
applications. They are available in a variety of forms to suit
different flange formats . RTJs can be used for very high and/or
fluctuating pressures (up to 1500 bar), depending on the profile
selected. Material selection determines use for high temperatures
(up to i000°C) and in aggressive media. To ensure proper sealing
the surfaces of contact between the gaskets and flange have to be
carefully processed. The small sealing area and high contact
pressure results in excellent sealability.
|Material||HB Hardness||Temperature Limitations||Identification|
|Soft Iron||90||-60 to +400 °C||D|
|Low carbon steel||120||-40 to +500°C||S|
|4%-6% Cr ½% Mo:F5||130||-125 to +500°C||F5|
|Stainless steel 304/304L||160||-250 to +650°C||S304 or 304L|
|Stainless steel 316/316L||160||-196 to +800°C||S316 or 316L|
|Stainless steel 321||160||-250 to +870°C||S321|
|Stainless steel 347||160||-250 to +870°C||S347|
|Stainless steel 410||170||-20 to +500°C||S410|
Standard Gasket Material
Commercial quality sheet steel with an upper temperature limit of
approximately 1000º F., particularly if conditions are oxidizing.
Not suitable for handling crude acids or aqueous solutions of salts
in the neutral or acid range. A high rate of failure may be
expected in hot water service if the material is highly stressed,
Concentrated acids and most alkalies have little or no action on
iron and steel gaskets which are used regularly for such services.
304 Stainless Steel
- An 18-8 (Chromium 18-20%, Nickel 8-10%) Stainless with a maximum
recommended working temperature of 1400º F
- At least 80% of applications for non-corrosive services can use
Type 304 Stainless in the temperature range of -320 F to 1000º F.
- Excellent corrosion resistance to a wide variety of chemicals.
- Subject to stress corrosion crackling and to intergranular
corrosion at temperatures between 800º F to 1500º F in presence of
certain media for prolonged periods of time.
316 Stainless Steel
- An18-12 Chromium-Nickel steel with approximately 2% of Molybdenum
added to the straight 18-8 alloy which increases its strength at
elevated temperatures and results in somewhat improved corrosion
- Has the highest creep strength at elevated temperatures of any
conventional stainless type.
- Not suitable for extended service within the carbide precipitation
range of 800º F to 1650º F. when corrosive conditions are severe.
- Recommended maximum working temperature of 1400º F.
316L Stainless Steel
- Continuous maximum temperature range of 1400º F -1500º F.
- Carbon content held at a maximum of .03%.
- Subject to a lesser degree of stress corrosion cracking and also to
intergranular corrosion than Type 316.
321 Stainless Steel
- An 18-10 Chromium-Nickel steel with a Titanium addition.
- Type 321 stainless has the same characteristics as Type 347.
- The recommended working temperature is 1400º F to 1500º F. and in
some instances 1600º F.
347 Stainless Steel
- An 18-10 Chromium-Nickel steel with the addition of Columbium.
- Not as subject to intergranular corrosion as is Type 304.
- Is subject to stress corrosion.
- Recommended working temperature of 1400º F -1500º F and in some
instances to 1700º F.
410 Stainless Steel
- A 12% Chromium steel with a maximum temperature range of 1200º F.
to 1300º F.
- Used for applications requiring good resistance to sealing at
- Is not recommended for use where severe corrosion in encountered
but is still very useful for some chemical application.
- May be used where dampness, alone or coupled with chemical
pollution, causes steel to fail quickly.
- 4-6% Chromium and 1/2% Molybdenum alloyed for mild corrosive
resistance and elevated service. Maximum working temperature is
- If severe corrosion is anticipated, a better grade of stainless
steel would probably be a better choice. Becomes extremely hard
- Arsenical Admiralty 443 has 71% Copper, 28% Zinc, 1% Tin and trace
amounts of Arsenic.
- High corrosive resistance, holds up extremely well against salt and
brackish waters, and water containing sulfides.
- Recommended maximum working temperature of 500º F.
- Ideal for carrying corrosive cooling waters at relatively high
- 45% Iron, 24% Nickel, 20% chromium, and small amounts of Molybdenum
- Maximum temperature range of 1400º F -1500º F.
- Developed specifically for applications requiring resistance to
corrosion by sulfuric acid.
- Brinell hardness is about 160.
- Alloy 110 is commercially pure (99% minimum).
- Its excellent resistance and workability makes it ideal for double
- For solid gaskets, stronger alloys like 5052 and 3003 are used.
- Maximum continuous service temperature of 800º F.
- Yellow brass 268 has 66% Copper and 34% Zinc.
- Offers excellent to good corrosion resistance in moist
environments, but is not suitable for such materials as acetic
acid, acetylene, ammonia, and salt. Maximum recommended temperature
limit of 500 F.
- Nearly pure copper with trace amounts of silver added to increase
its working temperature.
- Recommended maximum continuous working temperature of 500º F.
- Contains 69% Copper, 30% Nickel and small amounts of Manganese,
Zinc and Iron.
- It is mostly used in sea water applications, where lesser resistant
alloys rapidly deteriorate.
- Maximum recommended temperature limit 500º F.
- 26-30% Molybdenum, 62% Nickel and 4-6% Iron.
- Maximum temperature range of 2000º F. resistant to hot,
concentrated hydrochloric acid.
- Also resists the corrosive effects of wet hydrogen chlorine gas,
sulfuric and phosphoric acids and reducing salt solutions.
- Useful for high temperature strength.
- 16-18% Molybdenum, 13-17.5% Chromium, 3.7-5.3% Tungsten, 4.5-7%
Iron and the balance is Nickel. Maximum temperature range of 2000º
- Very good in handling corrosives.
- High resistance to cold nitric acid of varying concentrations as
well as boiling nitric acid up to 70% concentration.
- Good resistance to hydrochloric acid and sulfuric acid.
- Excellent resistance to stress corrosion cracking.
- Recommended working temperatures of 2000º F. and is some instances
- Is a nickel base alloy containing 77% Nickel, 15% Chromium and 7%
Iron, Excellent high temperature strength.
- Frequently used to overcome the problem of stress corrosion.
- Has excellent mechanical properties at the cryogenic temperature
- 32.5% Nickel, 46% Iron, 21% Chromium, resistant to elevated
temperatures, oxidation and carburization. Recommended maximum
temperature of 1600º F.
Note: Maximum temperature ratings are based upon hot air constant
temperatures. The presence of contaminating fluids and cyclic
conditions may drastically affect the maximum temperature range.
Designs are also available for Subsea applications.
|PRESSLURE ALASSES, API 6BX|
for APL 66x flanges
|Bx150||-||-||-||1 11/16||1 11/16||-||72.19||9.30||9.30||1.59||0.295|
|Bx151||-||-||-||1 13/16||1 13/16||1 13/16||76.40||9.63||9.63||1.59||0.337|
|Bx152||-||-||-||2 1/16||2 1/16||2 1/16||84.68||10.24||10.24||1.59||0.425|
|Bx153||-||-||-||2 9/16||2 9/16||2 9/16||100.94||11.38||11.38||1.59||0.632|
|Bx154||-||-||-||3 1/16||3 1/16||3 1/16||116.84||12.40||12.40||1.59*||0.875|
|Bx155||-||-||-||4 1/16||4 1/16||4 1/16||147.96||14.22||14.22||1.59||1.22|
|Bx156||-||-||-||7 1/16||7 1/16||7 1/16||237.92||18.62||18.62||3.18||4.14|
|Bx159||-||-||-||13 5/8||13 5/8||13 5/8||426.72||25.70||25.70||3.18||14.41|
|Bx162||-||-||16 3/4||16 3/4||16 3/4||-||475.49||14.22||14.22||1.59||-|
|Bx164||-||-||-||18 3/4||18 3/4||-||570.56||30.10||24.59||3.18||-|
|Bx170||-||-||-||6 5/8||6 5/8||-||218.03||14.22||14.22||1.59||-|
|Bx171||-||-||-||8 9/16||8 9/16||-||267.44||14.22||14.22||1.59||-|
|Bx172||-||-||-||11 5/32||11 5/32||-||333.07||14.22||14.22||1.59||-|