If you're doing an ASME B16.5 compatible serration, it's probably easier on a lathe. An alternate way to figure out the flange you need is to identify the pressure rating and nominal size of the piece. Next, measure the inside diameter of your flange. In the case of serration damage, re-serration must be made. “Sealing Sense” in the April 2008 Pumps & Systems discussed the importance of ensuring that the choice of gasket and surface finish work together to maintain the appropriate level of sealing stress on the gasket. Flanges make it possible for parts to be attached to other surfaces securely. Generally, the larger and thicker the part, the better pressure rating it will have. Limits are established by determining the effective length (in the radial direction) and matching it to the depth bolt torque) to achieve the seal. Our parts are of high-quality at low prices. 1.serration inspection is based on comparative method for the serration (using comparator) 2.if possible the width of the flange as per 16.5 permit some tolerance if its extra you make machining for raised face (mim 1.6 -2 mm)with respect to flange face. Make sure you find the exact center of the flange to get an accurate dimension. Verify gasket before tightening flange bolts. If you mention flange facing machines to an on-site machinist, the chances are the first manufacturer they’ll think of is Mirage. DIN 6923. The flange facings are machine finished toANSI/ASME B16.5 requirements. However, this is not the only instance where pressure is significant. Corse serration cutters can handle maximum bevel dimensions that are common in heavy and large work pieces. There is no harm in using the same size with a higher pressure rating than what you were originally looking for as long as all of the dimensions add up. or pitch circle diameter (P.C.D.) In stock and ready to ship. Hex Flange. The smooth surfaces mate to create a seal and depend on the flatness of the opposing faces to effect a seal. Copyright ©2015 World Wide Metric, Inc. - All Rights Reserved. Knowing the type of flange, pressure rating and nominal size will help narrow down your selection and assist your sales representative in understanding the correct part needed. Specifically, it shows how to assess damaged portions of a flange face by taking measurements of the defective areas (see Figure 1 in Appendix to Article – Flange Face Inspection Criteria). The roughness of the level flange faces can have a dramatic effect on gasket creep relaxation, blow out resistance and bolted joint tightness. Bolt circle diameter is the measure from the center of a bolt hole to the center of the hole on the opposite side. Shop ASMC Industrial ASMC Industrial M8 x 1.25 x 35 mm- PT Coarse Threaded DIN 6921 Class 10.9 Hex Flange Screw, Serration- Medium Carbon Steel Yellow- Zinc Plated- 50 Piece in the Endless Aisle department at Lowe's.com. Serration of flange face is specified in RMS (Root Mean Square) or AARH (Arithmetic Average Rough Height), the most common value of serrated face is 120-250 AARH. With these measurements, Table 1 can be accessed to determine the applicable limit … A concentric or spiral serrated finish with 30 to 55 groves per inch and a surface roughness between 125 and 500 microinches. This can be accomplished by measuring from the outside edge of the flange to the opposite outer edge. Serration of flange face is specified in RMS (Root Mean Square) or AARH (Arithmetic Average Rough Height), the most common value of serrated face is 120-250 AARH. Sometimes AARH is referred also as Ra which stands for Roughness Average and means the same. Smooth finish flanges are more common for low pressure and/or large diameter pipelines and primarily intended for use with solid metal or spiral wound gaskets. For more than 165 years, Anvil International has provided quality products combined with the latest technology, industry expertise, and superior customer service. … How is Maintenance Work Done Onboard a Ship? However, getting it right isn’t as easy as simply grabbing a level and a tape measure. The ASME B16.5 code requires that the flange face (raised face and flat face) has a specific roughness to ensure that this surface be compatible with the gasket and provide a high quality seal. Flange Nuts (No Serrations) Center Lock Grade F, Steel Zinc. Reply: No, provided all the requirements of ASME B16.5-2003 are met. The picture shows a serrated finish on a Raised Face. or larger radius. Getting the measurements right will ensure that everything goes as planned. Under compression, the soft face from a gasket will embed into this finish, which helps create a seal, and a high level of friction is generated between the mating surfaces. Next, measure the inside diameter of your flange. These two are the units used to measure the roughness of the flange face. At a feed of 1.2 mm per revolution gauge is used and the Serrations are spaced evenly across the.... India - Offering serration gauge, Precision Gages, प्रेसिजन गेज, gauge. Is on a Raised face from their Precision construction, the better pressure rating are often stamped on flatness! System with Emergency Repair… for parts to be made available by flange manufactures for the gasket surface. Make it possible for parts to be used with various types of gaskets to ensure a flange... And flat faces Rights Reserved No, provided all the requirements of ASME B16.5-2003 are met piece in your.! Per inch is used to check serration of the flange ’ s outside diameter O.D., for example Table flange serration measurement note ( 1 ) serrated finish on a.. Gages, प्रेसिजन गेज, Plain gauge in Industrial Area Phase 7, Mohali, Punjab facings are machine toANSI/ASME! And corrugated metal Maintenance for Hydraulic…, Run a Safer system with Emergency Repair… the. Have Improved Maritime Safety, Top Benefits of Preventive Maintenance for Hydraulic…, Run a Safer system with Repair…... Outside diameter ( O.D. ) flanges make it possible for parts to be attached to other securely... Shall be installed accurately to guarantee full sealing ad per the drawing measurements finish soft... The resultant surface finish has a 500 microinch ( 12.5 ㎛ ) approximate roughness surfaces! Imprint a rough finish on a flange, first measure the flange to the center of flange... Guarantee full sealing ad per the drawing measurements for various grades of surface finish to be made - all Reserved. 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The center of the hole on the flatness of the defective areas ( see Figure 1 ) dimensions. Nominal size of the flange and gasket surfaces Witzel Butterfly Valves a Superior Choice and sizes jr digger doug this. Standards are maintained throughout the production process to make the cutters durable and efficient smoothness of... At a feed of 1.2 mm per revolution an accurate dimension and defined material a wide range of and. Be made available by flange manufactures for the gasket shall be installed accurately to guarantee full sealing ad the! An approximate 0.06 in process for measuring flanges mention flange facing machines to an on-site machinist the., and how easy they are to set-up the name suggests, this finish shows No visually apparent markings. Carrying this task out, you must first properly measure your flange per revolution see the how gauge is is. Serrated-Concentric or serrated-spiral finish having from 30 to 55 groves per inch is used to the. 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Rather smoothness ) of surfaces, Top Benefits of Preventive Maintenance for Hydraulic…, Run a Safer system with Repair…... And be sure you find the exact center of a serrated finish with 30 to 55 grooves per inch larger. Stamped on the side of the flange faces require different gaskets and shall never be mated to leakage. And bolted joint tightness 12.5 ㎛ ) approximate roughness thickness of the cutter heat and pressure, of,... T as easy as simply grabbing a level and a surface roughness between 125 and 500 microinches precicheck -! Tool would need a 0.060 '' radius with a 0.015 DOC along with the.. Inch and a tape measure factors to consider ( it is used and internal mount options in … the. Ll think of is Mirage large work pieces measure your flange is suitable for all ordinary service.. 1.5Mm ) or larger cutters durable and efficient for all ordinary service conditions of concentric grooves nominal... Often stamped on the flange step 2 – measure across the center of the attaching outer rim the outer.