$3M Saved Using Water Bags for Weight Testing

Tuesday, August 21, 2001
The Navy has recently begun using water bags accomplishing periodic weight tests of boat davits. A result of a teaming effort between NAVSEA, NAVSEA Philadelphia-SSES and FTSCLANT, this innovation will save the Navy over $3 million per year compared to traditional methods. In the past, tests using concrete block or steel weights required a pier side or barge crane plus four-six individuals, cost as much as $20 thousand and required up to eight hours. Using water bags is simple. A flexible container is filled with water, acting as the test weight. Water supplied from the ship fire main fills the bag to the required weight. (Remember "A pint's a pound the world around"?) A wireless load cell shackle connected between the bag master link and the davit hook provides an accurate reading as the bag fills. Adding or draining water adjusts the weight. Once the operation is complete, the container is drained and packaged for storage. Since it can be packed up at the relatively small size of 175 - 300 lbs, the process requires no crane supporting or positioning the bags on the davit. Only about three workers are needed over a three-hour job. Cost savings constitute the greatest advantage. The Navy spends between $3.6 and $5.2 million per year for weight tests. Estimated annual costs will decrease approximately $560K per test by eliminating the need for a crane plus reduced labor and time, producing savings of over $3 million. Safety is enhanced, as physical handling of large weights is no longer necessary. Scheduling flexibility increases for the testing activity and the TYCOM, ship's force and FTSC. Without the need to schedule a crane, tests can be accomplished with very little advanced notice. Greater flexibility generates additional savings that defy accurate calculation. Funding obtained from NAVSEA's Engineering for Reduced Maintenance Program enabled the teaming effort between NAVSEA, NSWCCD-SSES and FTSCLANT. The first step called for identifying a manufacturer whose product was safe, functional and reliable. Water Weights Inc. was quickly identified. The second step entailed resolving physical size constraints for the bags because of unique test requirements associated with boat davits. Unlike many other hull and deck machinery systems, boat davits must inhaul the test weights to the fullest inboard point, ensuring the davit winch and structural members are subjected to loading experienced during actual conditions. This brings the weights within the shell of the ship, requiring shapes small enough to avoid deck obstructions. Water Weights Inc. was able to modify "off the shelf" bags to fit. The final step was development of operational and maintenance procedures for incorporation into manuals and a training video. It shows the principle of operation as well as the test. The footage was taken and the operational and maintenance procedures "proofed in" during actual tests on USS GEORGE WASHINGTON (CVN 73), USS BARRY (DDG 52), and USS MOUNT WHITNEY (LCC 20). - (By Tom Warring, Public Affairs Officer, Naval Station Warfare Center, Carderock Division)
Maritime Reporter August 2014 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Offshore

Viking Supply Ships Sell PSV 'SBS Cirrus'

Rederi AB TransAtlantic subsidiary Viking Supply Ships says it has sold the 1985 built platform supply vessel SBS Cirrus. The vessel has been delivered to its new owners,

SBM Offshore Announces Thunder Hawk Tiebacks

SBM Offshore is pleased to announce it has signed a Production Handling Agreement (PHA) with Noble Energy to produce the Big Bend and Dantzler fields to the

Fifth Jackup Contract for Keppel from Gulf Drilling

Keppel FELS Limited, a wholly owned subsidiary of Keppel Offshore & Marine, has secured a contract from Gulf Drilling International Ltd. of Qatar to build a

 
 
Maritime Careers / Shipboard Positions Maritime Standards Navigation Pipelines Pod Propulsion Ship Electronics Ship Repair Ship Simulators Shipbuilding / Vessel Construction Winch
rss | archive | history | articles | privacy | terms and conditions | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.1039 sec (10 req/sec)