how to correct the scientific selection of PP-R pipe fittings

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PP-R pipe manufacturers, raw material PP-R pipe is polypropylene (PP-R), different brands of raw materials to produce the product

there are some differences in performance, coupled with the high and low on the production line of grade various manufacturers out of

PP-R pipe The quality gap. The PP-R pipe must be in the pre-installation inspection, identification of acceptable quality to use.

Sanitary pipe fittings

Selection of pipe fittings should first have the quality of inspection reports of the quality inspection department, which used for

drinking water pipe should also have the health performance of the health inspection department inspection reports, and also inspection

of pipes and fittings for the appearance of quality and diameter and wall thickness, pipe inspection, according to GB / T 18742.2? 2002

GB/T18742.3? 2002 National Institute of Standards of the following items in the main test:

Stainless steel flange

A pipe appearance. The color of the pipe should be basically the same, the external surfaces should be smooth, smooth, no dents, bubbles

and surface defects affect performance and should not contain visible impurities; pipe surface should be smooth, flat and does not allow

any cracks, bubbles, peeling, and obvious impurities, serious shrinkage shape and color and uneven discoloration decomposition and other

defects.
2, pipe pieces opacity. The pipe should be opaque.

Stainless steel tee

3, the pipe diameter and wall thickness. According to the the GB/T18742.2-2002 national standards, the pipe size is divided into S5, S4,

S3.2, S2.5, S2 five series. Pipe series S and the corresponding nominal pressure, pipe size pipe series S, the nominal outside diameter

dn * Nominal wall thickness en, the main test pipe nominal diameter, with an average outer diameter and the corresponding wall thickness

and tube series, pipe with socket size and the corresponding nominal diameter.

Stainless steel elbow

4, pipe the physical and mechanical properties and chemical properties. Hydrostatic testing, melt flow rate, hydrostatic state

longitudinal retraction rate of the thermal stability test as well as pipe, Charpy impact test in line with national standards,

inspection and report of this to check the material and re-examination report .
5, the health performance of the pipe fittings meet the national standard. This to check the health inspection department of the health

performance of the pipe inspection reports.
6, system suitability. Pipes and fittings connected by two combinations of internal pressure of 8760 hours and 5000 cycles of thermal

cycling test.