Gaskets

Asian Sealing Products Pvt. Ltd. 

Asian Sealing Products Pvt. Ltd. is a gasket manufacturer, exporter and supplier in India.

Ring Gaskets
At ASP, manufacturing of Ring Gaskets is done as per international standards such as API 6A, API 17D and ASME B16.20. We produce Ring gaskets as per user specifications as well.
Traceability is maintained right from the raw material until the final production.
Ring Gaskets are of three types which are used in High temperature and high-pressure applications where API 6B or API 6BX or ASME B16.50 flanges are used. Those are R, RX and BX types.

R Type of Ring Gasket
R type gaskets are of two shapes which are Oval and Oct. These types have matching pitch diameter to the flange groove they belong to. The octagonal type has a superior sealing capacity than the other. The oval type will only suit the round bottom groove of the flange; however, both the types of R type Ring gasket will fit in flat bottom grooves. As per the international flange standards these gaskets can
withstand between 5000 psi to 6250 psi.


RX Type of Ring Gasket
RX type ring gasket has an exclusive self-sealing action. The outside bevels of the ring make the initial contact with the groove as the flanges are brought together with the flange bolting. This provides initial sealing of the joint with the gasket seating against the groove surfaces. During pressurization the gasket loading increases against the groove. Type RX ring gaskets as specified in ASME B16.20 and API 6A are completely interchangeable with the oval and octagonal series of identical reference numbers and are used in the same flange grooves.


BX Type of Ring Gasket
BX type ring gasket is designed to specifications shown in ASME B16.20 or API 6A, for use with grooved flanges on special applications involving high pressures from 5000 psi to 15000 psi. Cross section of BX type ring
gasket, as shown in Figure 1.3 has a 90° hole drilled on the face of the gasket is used as pressure balance. The pitch diameter of the ring is slightly larger than the pitch diameter of the groove, thus initial contact is made on the outside of the ring, pre- loading the gasket and creating a pressure energized seal. BX type of ring gasket can only be used with API BX flanges and are not interchangeable with the type RX series.

SBX Type
SBX type of ring joint gaskets are dimensionally the same as BX type ring gaskets. The “S” before BX represents additional interconnecting pressure passing vent hole to 90° vent hole present in BX type ring gaskets. This additional vent hole prevents from pressure getting trapped during assembly. As far as the drill type is concerned, API 17D 3rd edition has recommended two options as option “A” and option “B” as given below however most widely chosen option is option “A”. Both BX ring gasket and SBX ring joint gaskets are used in subsea 6BX flanges and/or 17D ring joint flanges Our SBX ring joint gaskets complies to the
requirements of API 17D 3rd edition, and we have API 17D monogram license to produce SBX ring type gaskets.


RTJ with PTFE Insert
Style R and RX with PTFE Inserts Style R and RX Ring Type Joints can also be supplied with PTFE inserts, in order to reduce turbulent flow and eliminate gasket/flange erosion. For the RX style Ring Type Joints, the insert is specially designed with radially drilled pressure passage holes so that the self energising performance of the RX Ring Joint is not impaired. As can be seen in the sectional view, the insert is located between the inside diameter of the Ring Type Joint and the bore of the flange. On assembly, the insert is completely trapped between the make up of the flanges, filling the annular space between the flange bore and gasket.


Combo or Transition Rings / RTJ PTFE Coated
These are combination rings which consist of two different sizes having the same pitch circle diameter. They are used for sealing Ring Type Joint flanges where the mating flanges have different ring groove geometry. Transition Ring Type Joints are available with either oval or octagonal facings and are not encompassed within the API or ASME specifications.


RTJ – Rubber Coated
This is an oval Ring Type Joint totally enclosed in a nitrile rubber coating. The Ring Type Joint material is usually soft iron or low carbon steel.
Advantage of this type of gasket:
• Used in pressure testing to minimise damage to flanges.
• Rubber contact points provide additional seals while protecting the flange surfaces.
• Provides increased assurance against corrosion, which can occur between conventional Ring Type Joints and the engaged surfaces of the groove.


RTJ Blind Gaskets
Ring Type Joint gaskets can also be manufactured as a blind profile.

RTJ – Kammprofile-Pressure Energized Gaskets
Kammprofile - PEG with Kammprofiled sealing surfaces, where a RX type ring is typically used for high pressure reactors. Frequently, custom ring are used in the top and bottom of hydro processing reactors. To greatly enhance sealing ability, top and bottom OD angled sealing gasket surfaces are serrated per Kammprofiled specifications and faced with oxidation inhibited flexible graphite. It has the benefits of under compression graphite flows into minor imperfections creating higher seal tightness.

RTJ – Kammprofile-Adapter Gaskets
Kammpro-Adapter gaskets allow for ring type joint flanges to be mated up to a raised face flanges, utilizing the strengths of the full metallic with the added benefit of kamm profiled sealing surfaces laminated with flexible graphite. Provided the pitch of the groove is sufficiently located under the raised face, this design is among the stoutest of adapter styles.

Camprofile Gasket
Camprofile is a composite gasket which utilises a serrated metal core with a soft facing material. Themetal core is a machined on each contact face with concentric serrations which provide high pressure areas,ensuring that the soft coating flows into any imperfections in the flange even at relatively low bolt loads. Thesoft facing material is engineered to compress in to the serrations on the core and form a thin film across thepeaks creating the ideal sealing density in the grooves of the profile. The result is a gasket which combines thebenefits of soft cut materials with the advantages of seal integrity associated with metallic gaskets.
Expanded graphite is the most common facing material used for camprofile gaskets. However, other materialscan be used, such as PTFE for chemically aggressive duties or mica for high temperature service.


Metal Seal Ring
The seal ring resembles a “T” cross section. The leg of the “T” forms a rib that is held by the hub faces as the connection is made up. The two arms form lip seals that create an area of sealing surface with the inner surface of the hub. Internal pressure works to reinforce this seal. Seal rings are available in the following standard material grades: AISI 4130/40, 630 SS (17/4PH), Super Duplex F55) and Alloy 718. Other materials are also available (including F316, F44 and 660 SS) to suit particular client applications. Seal rings are supplied with either PTFE or MoS2 dry film lubrication to aid make-up. Both are suitable for general oilfield service; for
service conditions above 230°C (450°F) use MoS2. Seal rings should be handled and stored with care, inspected for damage and interference. The seal ring should be discarded if there is any damage to the tapered seal surfaces.


Hammer Union
ASP also specialize in manufacturing Hammer Union from forged or cast raw materials, offering customized solutions in sizes ranging from 1 to 12 inches, with ratings up to 20,000 PSI.