Laboratory

The HAWLE laboratory continuously performs various tests to ensure quality workmanship. Raw materials are checked for their suitability, samples are taken at random and checked during each production step and finished goods are subject to periodic tests, audit and review. Both destructive and non-destructive procedures are applied in order to yield those test results needed to determine the product’s quality level and carried out according to HAWLE test methods by specially trained and experienced staff. All test results are documented and corrective measures are initiated if necessary.

Some of the tests used are:

laboratory_hawle_1_en 100% pressure testing corrosion test practice test burst test tensile tests

100% pressure testing

Inspection during the assembly
Functional test (low torque)
Pressure test
Visual inspection during pressure test
Drainage

Operational and functional safety receives the greatest possible attention from HAWLE. Each and every valve, pipe saddle and hydrant are rigorously tested for inherent strength, function and absence of leakage in accordance with EN 12266. Samples are also collected at random for materials and tolerance testing.

Example of a hydrant test:

  • HAWLE inspects during assembly of the hydrants to ensure that the individual components and parts function properly.
  • Torque measurement is the first functional test of the hydrants and is performed without medium with the primary purpose to confirm unobstructed free moving parts.
  • The second step is to set the hydrant under 26 bar water pressure in order to investigate operational suitability and strength. This water pressure is equivalent to 1.5 times the rated limit for fire hydrants PN16 as defined in EN 12266. The hydrant must show signs of leakage within the standardized test time of two minutes.
  • The valve plug is subsequently closed. Then all of the water must be able to drain out of the hydrant column via the drainage hole positioned at the bottom. The valve plug position and proper function is tested this way because any residual water may not exceed 100 ml according to EN 14384. HAWLE fire hydrants shall contain virtually no residual water because this allows for growth of unwanted microorganisms.
  • In accordance with EN 12266, the valve plug is tested for absence of leakage with 1.1 times the nominal pressure. Water may not escape through the drainage hole during the pressure and subsequent valve plug leakage test.