The ductile iron pipes shall be tested under hydraulic pressure according to ISO2531-2003(E) and GB/T13295-2003.

Concept

 

The ductile iron pipes shall be tested under hydraulic pressure according to ISO2531-2003(E) and GB/T13295-2003 to ensure the quality and mechanical properties of pipe to satisfy the requirement of standard.  

 

The composition of the equipment

 

The stop blocking device, centering machine, machine bracket, machine support, main oil cylinder, floating pressure head, pulling rod, sealing head, lifting machine, water supplying system, hydraulic system and electric control system. 

 

The main technical parameters of the equipment

 

 (1)The testing pressure of the hydraulic pressure machine 

Diameter (DN)	Testing pressure MPa
	K8	≥K9
100-300	4.0	5.0
350-600	3.2	4.0
600-1000	2.5	3.2
1100-1200	1.8	2.5

(2)Installed capacity and circulating water quantity

Equipment type	Total installed capacity	Circulating water quantity
DN 100-400	60 kw	10m3/h
DN 400-800	78 kw	12m3/h
DN800-1200	96 kw	120m3/h

 

Operating Procedure

 

1 Pipe is transferred to centring station through the pipe stopper

2 Start the centering air cylinder, adjust the position of the pipe

3 Start the walking beam conveys the pipe to a horizontal distance, then land and put the pipe onto the synchro lifting machine.

4. Start the synchro lifting machine oil cylinder to uplift the pipes, and start the spigot sealing oil cylinder to put the pipes into the socket sealing device.

5.start the low pressure pump after it is full, inject the water into the pipe with turning on the deflation valve, and turn off the deflation valve when the water flow out from the valve. Turn on the high pressure water pump feedwater valve at the same time, inject the high pressure water into the pipe till the water pressure is qualified, keep the pressure 10 seconds and check if there is any leakage or disqualification, and then mark the pipe for repairing or cancellation.

6. 10 seconds later, turn on the hydraulic control water valve till the pressure closes to zero.

7. Start the spigot sealing cylinder to reset the cylinder and at the same time start the reset motor of synchro lifting machine to reset.

8.Start the synchro lifting machine cylinder to fall the pipe and start walking beam to convey the pipe to next station.

Hydraulic Pressure Testing Machine