The fittings to welding Meceweld are used exclusively for instrumentation pipe connections. These accesories are ideal, in making up high pressure circuits which must be absolutely reliable when subjected to the most rigorous and variable working conditions. The most important part of any Meceweld fitting is the socket weldend connection which is carefully machined within strict tolerances. Meceweld welding fittings have been analitically designed; based on the general requirements of the ASME code as well as ASME B31.3, ASME B16.11 and ASME B16.34 strandards.
HISTORY OF MECEWELD ACCESSORIES
Meceweld accessories are born in 1981, when the need to create a wide range of fittings is found to be welded to the pipe or tubing. Until today, they have been modifying designs and improving their properties.
ASME B31.1 / ASME B16.11 / ASME B16.34
MECEWELD welding fittings have been analitically designed; based on the general requirements of the ASME code as well as ASME B31.1, ASME B16.11 and ASME B16.34 standards.
Are made in two two types of material: 316 Stainless steel and carbon steel. On special order, we can furnish in other materials, such as 304 stainless steel, Hastelloy, Inconel, etc... (see special materials catalog).
Stainless steel fittings are delivered pickled and passivated; and in carbon steel are subjected to a phosphate treatment.
Meceweld fittings are used for welding to piping of either one of the two following types of dimensional standards: Dimensions in inches, from 1/4" O.D. (6.35 m.m.) to 1" O.D. (25.4 m.m.), dimensions in millimetres, from 6 to 20 m.m. Fittings for othg dimensions can be supplied upon demand. An adapter has been designed to enable gas pipe to be connected to millimetric tubing.
Working pressure are shown i8n the section corresponding to each fitting and are alculated for the temperature range from -20ºF to 100ºF (-29ºF to 38ºF). Working conditions for the other temperatures can be determined from the following equation:
Pt = (Pn*K)/1000 = (Bar)
Pt = Working pressure at the desired temperature.
Pn = Working pressure of the fitting according to its section and corresponding reference.
K = Correction coefficient according to tables 1, 2 and 3.
Don't use threaded fittings at temperature higher than 1000ºF (538ºC).
For fittings in stainless steel grade 316 in case that service temperature be able to exceed 1000ºF (538ºC), it should be indicated in the order.
We don't recommend using these fittings at temperatures.