All connections and water applied for, and all water used, shall be upon the express condition that the city is not liable, nor shall any claim be made against it, for damage or injury caused by reason of the breakage of any main, branch, service pipe, apparatus or appurtenance connected with the waterworks and sewerage system or plant, or any part or portion of the plant, or for any interruption of the water supply by reason of the breakage of machinery, excessive use of water by consumers, stoppage, alterations, extensions or renewals.