Section 318.1808. Hydraulic driving means.

  These are department rules in addition to the requirements in ASME A18.1 section 8.1:

(1)   shutoff valve.

(a) A manually operated shutoff valve shall be provided between the hydraulic pump unit and the hydraulic cylinder.

(b) For a lift with a machine room, the shutoff valve under par. (a) shall be located inside the machine room and adjacent to the hydraulic pump unit.

(2)   Pump relief valve.

(a) General. Each pump or group of pumps shall be equipped with one or more relief valves conforming to all of the following, except as specified in par. (b) :

1. Be located between the pump and the check valve.

2. Be of such a type and so installed in the bypass connection, that the valve cannot be shut off from the hydraulic system.

3. Be of sufficient size, individually or accumulatively, to pass the maximum rated capacity of the pump without raising the pressure more than 50% above the working pressure. Two or more relief valves may be used to obtain the required capacity.

4. Be sealed after being set to the correct pressure.

(b) No relief valve. A relief valve is not required for centrifugal pumps driven by induction motors, provided the shut-off, or maximum pressure that the pump can develop, is not greater than 135% of the working pressure at the pump.

(3)   Check valve. A check valve shall be provided that will hold the platform lift with the rated load at any point if either of the following occurs:

(a) The pump stops and the down valves are closed.

(b) The maintained pressure drops below the minimum operating pressure.

(4)   Pressure-gauge fittings. A pressure-gauge fitting with a shutoff valve shall be provided at either of the following locations:

(a) On the cylinder side of the check valve.

(b) Immediately adjacent to the hydraulic control valve.

(5)   Type tests, certification, and marking plates for control valves.

(a) Engineering tests and certification process. Each type or model and make of a hydraulic control valve shall be subjected to the engineering tests and to the certification process specified in ASME A17.1 section 8.3.5, except ASME A17.1 section 8.3.5.3.1 does not apply.

(b) Hydraulic controls. Hydraulic control valves shall be plainly marked in a permanent manner with all of the following information:

1. The certifying organization's name or identifying symbol.

2. The name, trademark, or file number by which the organization that manufactured the product can be identified.

3. Type designation.

4. Component-rated pressure.

5. Electrical coil data.

CR 14-020 : cr. Register August 2014 No. 704 , eff. 9-1-14.