Pipe sizes and fittings

[oldgit72]

Just a simple question (I hope). When a pipe fitting is referred to as 16mm 20x27, what does the 20x27 refer to? I ask because fitting for 16mm pipe seem to be available in 15x21 and 20x27 and I need to know the difference. Thanks

[pachapapa]

pas métrique	pas bsp
8×13	1/4
12×17	3/8
15×21	1/2
20×27	3/4
26×34	1
33×42	1 1/4
40×49	1 1/2
50×60	2

[Chancer]

As PP has posted its the French way of expressing a British Standard Pipe Thread without admitting it [;-)]

The two figures correspond to the inside and outside diamaters in mm's of a rubber or fibre sealing washer that would be used between a parrallel threaded B.S.P. joint.

As you have found out there are more than one size of fitting for the multitude of French pipe sizes, all no doubt intended to make French plumbing seem like a black art to the great unwashed.

[Dave&Olive]

hi ok

           for copper pipe 16/18   18/20  it`s the inside outside pipe diameter

          the 20x27 refers to the black iron  /  galv  pipe     inside out side diameter  but in metric see here

   

Male Thread Diameter	Female Thread Diameter	Pipe Minor Diameter mm	Pipe Major Diameter mm	Tapping Drill Size mm	TPI	Pitch mm
R 1/16"	Rp 1/16"	3	7,723	6,561	28	0,907
R 1/8"	Rp 1/8"	6	9,728	8,566	28	0,907
R 1/4"	Rp 1/4"	8	13,157	11,445	19	1,337
R 3/8"	Rp 3/8"	10	16,662	14,950	19	1,337
R 1/2"	Rp 1/2"	15	20,995	18,631	14	1,814
R 3/4"	Rp 3/4"	20	26,441	24,117	14	1,814
R 1"	Rp 1"	25	33,249	30,291	11	2,309
R 1 1/4"	Rp 1 1/4"	32	41,910	38,952	11	2,309
R 1 1/2"	Rp 1 1/2"	40	47,803	44,845	11	2,309
R 2"	Rp 2"	50	59,614	56,656	11	2,309
R 2 1/2"	Rp 2 1/2"	65	75,184	72,226	11	2,309
R 3"	Rp 3"	80	87,884	84,926	11	2,309
R 4"	R 4"	100	113,030	110,072	11	2,309
R 5"	Rp 5"	125	138,430	135,472	11	2,309
R 6"	Rp 6"	150	163,830	160,872	11	2,309

                    Dave

[oldgit72]

Thanks, learning all the time.