Small Male Female Flanges Forum
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Dear Members,
My question about flange types;
1. What are the main purpose of using male & female and
tongue&groove flanges instead of raised face flange?
2. What are the advantage or disadvantage of male & female
and tongue&groove flanges?
Thanks...
Another complexity is that some rigid rules must be applied to the piping design .... Do you order valves to be female end both sides, or on one side maybe, in which case do you 'point all male ends in the flow direction' (pardon the expression) ... or what. Same applies to any flanged joint / vessel conn. of course.
You could always consider an RTJ flange instead.
onrush:
In the past I've used tongue-and-grooved flanges for many years - primarily in ammonia refrigeration service. The main attribute of using these type of flanges (although not mentioned yet) is that they inherently prevent a gasket "blow-out". I have never come across, seen, or heard of any shortcomings regarding mounting and machining. In fact, I've never had a leaky tongue-and-groove flange - and that is quite an achievement in ammonia service.
The obvious trade-offs include price and weight. I always used Vogt's design (found in their old F-11 catalog) and I've applied the type up to 3,000 psig working pressure. I always found them available and in stock - like other conventional raised face flanges when I bought them from Vogt. The material of construction I've used is forged steel. I would not hesitate using them if they are from a recognized supply - except that the price and the weight will be higher. I would certainly prefer them over RF type in ammonia service - based on my experience.
Like ring joints and lap joints, I believe they have had their "niche" in certain applications.
To quote the Navco Piping Datalog:
"The small tongue and goove type of face was developed originally for hydraulic service to effect a high unit gasket pressure in a confined area. It has the disadvantages of excessive gasket pressure under temperature change and pipe deflection, mushrooming of tongue under excessive bolt loading, and requires special attention in machining and assembly. The large tongue and groove type face has the merit of gasket retention with lower unit gasket pressure than the small tongue and goove. The gasket area is nearer the bolt circle making it slightly more resisitant to flange stresses and bending moments. Special care must be exercised in machining and assembly."
My experience concurs with Navco's opinion.
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Small Male and Female on end of pipe
(Click any image above to enlarge it and lock it in place, then scroll to the bottom table for dimensions)
Regular facing for 150 and 300 lb. Steel flanged fittings and flange standards is a 1/16 inch raised face included in the minimum flange thickness. A 1/16 inch raised face is also permitted on the 400, 600, 900, 1500, and 2500 Lb. Flange standards, but it must be added to the minimum flange thickness.
Regular facing for 400, 600, 900, 1500, and 2500 lb. Flange standards is a ¼ inch raised face not included in minimum flange thickness dimensions.
Care should be taken in the use of joints of these dimensions, (they apply particularly on lines where the joint is made on the end of pipe) to insure that pipe used is thick enough to permit sufficient bearing surface to prevent crushing the gasket. Threaded companion flanges are furnished with plain face and are threaded with American Standard Locknut Thread.
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Small Male Female Flanges Forum
