Following are general technical requirement of pump which is used for Fire Water Pump Skids. But You can select for your own as per project or client requirements.
Pump Technical Requirement for Fire Water Pump Skids
1 Unless otherwise specified, the main and standby fire water pumps shall be double suction, horizontal split case design that allows access to the impeller without disconnecting the inlet and/or outlet piping or affecting alignment. The main fire water pump shall be motor driven and the standby fire water pump shall be driven by a diesel engine. Pumps shall be supplied by an equipment manufacturer that has listed pumps for fire water service.
2 The pump casing shall be made of cast iron. The casing shall be sound, free of shrink or blow holes, scale, blisters, or other detrimental defects. The surfaces of the casting shall be cleaned to produce a smooth even surface. Pump casing shall be rated for the dead head pressure of the pump plus the maximum suction pressure specified in the pump datasheets or equipment specification.
2.1 Pump casing shall be provided with high point vent and low point drain connections. The high point vent shall be provided with an automatic air release valve. Pump suction and discharge nozzles shall be drilled for the installation of pressure gauges. Pressure gauges shall be provided with a root valve and shall be rated for the design pressure of the pump.
2.2 Pump nozzle forces and moments shall be minimized to the extent possible. This shall be accomplished by providing adequate supports on the piping and auxiliary components connected to the pump suction and discharge flanges. At no point will any of the nozzle forces and moments at any direction be above the pump manufacturer recommended values.
3 The bearing arms shall be cast integrally with the lower half of the casing to ensure positive bearing alignment. In no case will bolt on bearing arms be acceptable. Each bearing arm will provide a reservoir area for accumulation of weepage from the stuffing box, and a drilled and tapped opening will be provided at the lower portion to allow piping by the packager to the nearest floor drain.
3.1 All bearing arm drain connections shall be manifold to single connection run to edge of skid. Bearing arm drain connections shall not tie in with other skid system drain connections to prevent backflow of skid drainage into bearing reservoir area.
4 Impellers shall be one piece, casting, made of bronze, and shall be the enclosed type. They shall attach to the shaft via a key and lock in place via sleeves on both sides of the impeller. The pump minimum or maximum impeller shall not be used for the selected casing without the written approval by the Air Products specifying engineer. Pump rotating parts shall be balanced in accordance with ISO 1940 and meet the balance quality grade G6.3.
5 Head rise from the rated operating point to shutoff shall be a minimum of 10%. Pumps with constant-speed drives shall be capable of a minimum of 10% head increase at rated flow by installing a new impeller.
6 If the manufacturer’s standard design includes casing wear rings, they shall be positively secured (stacked or pined with an anti-rotation pin). Wear rings shall be bronze or stainless steel; pins shall be stainless steel. Tack welding is not permitted. Running clearances for wear rings and bushings shall be the supplier’s standard, taking into account fluid pumped, operating temperature, expansion, and galling characteristics of the materials.
7 The pump shaft shall be one piece and shall be made of forged steel. The shaft shall be of ample strength and rigidity and the shortest practicable distance between bearings shall be used to keep deflection and vibration to a minimum. The maximum allowable deflection of the shaft is 0.051 mm (0.002 in) at the seal area when operating at the maximum recommended differential pressure.
8 The pump shall be supplied with a single row inboard bearing primarily for radial loads and a double row outboard bearing primarily for thrust loads. Both bearings shall be regreasable lubrication ball type, designed for 250,000 hours average life. Each bearing shall be mounted in a machined housing that is moisture and dust proof. The housing shall have registered fits to ensure alignment, pinned to prevent rotation, and bolted to the bearing arms. Each housing shall be supplied with a grease fitting and a plugged relief port.
9 The shaft sleeves shall be extended from the hub of the impeller, through the seal box area, and beyond the gland. They shall be sealed at the impeller hub by a Buna O-ring to prevent pumped liquid from contacting the shaft.
10 A stuffing box shall be provided on each side of the pump casing, designed with sufficient area to incorporate either packing rings or mechanical seals. Unless otherwise specified the stuffing box shall be provided with at least four rings of diagonally cut non-asbestos packing and a bronze or Teflon lantern ring for each side to provide the sealing. The lantern ring shall be continuously flushed from the pump casing with stainless steel tubing. Unless otherwise specified, compression-type fittings shall be Swagelok or Parker A-Lok.
10.1 Each stuffing box shall be furnished with a two-piece bronze gland to securely hold the packing in place. The gland pieces shall be split to allow access to the packing without disassembly of the unit. Control of weepage shall be accomplished by the use of adjustable swing bolts.
11 A flexible coupling shall be provided to connect the pump shaft to the driver shaft manufactured by Rexnord or Thomas. For diesel engine driven pumps, shafts shall be retrofitted with a universal joint coupling for diesel engine to pump alignment. All open shafts, couplings, and other moving parts shall be provided with suitable guards according to the principles contained in BSI PD 5304 and OSHA 29 CFR, Part 1910, paragraph 219. This requirement includes the pump as well as all ancillary equipment. Nonsparking, protective guards shall be provided. Guards shall be fabricated from aluminum. Expanded metal is not permitted.
12 The pump and driver shall be mounted on a common baseplate and shall be aligned in accordance with the driven equipment manufacturer recommendations. The baseplate shall be mounted directly on the skid and shall be isolated by mechanical means for shock absorption due to hydraulic shock (water hammer) caused by instantaneous starting of the pump.
13 Pump casing and drive equipment feet shall be mounted on fully machined surfaces. Shims shall not be used under the pump casing for alignment. The maximum thickness of shims under the drive equipment feet shall not exceed 3 mm (1/8 in). Space shall be provided to dowel the drive equipment feet after final alignment.
Fire Water Pump Skids used in Process Gas Facilities
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