Every rig manager running a 1600 HP class mud pump eventually faces the same dilemma: a liner scores or a valve seat washes out on a weekend tour, and the crew is left asking two questions — how far can we push this pump before the next failure, and how fast can we get the right replacement parts? Two of the most common pumps in this class, the Gardner Denver PZ-11 and the Bomco F-1600, answer those questions differently. Understanding where they overlap — and where they do not — helps you plan both your operating envelope and your spare-parts inventory.
Two Workhorses in the 1600 HP Class
The PZ-11 and the F-1600 sit in the same horsepower bracket and are often found on rigs of similar depth capacity, which is why operators frequently compare them when standardising a fleet or sourcing spares. The Bomco F-1600 is a horizontal triplex single-acting piston pump rated at 1600 HP input power, built around a 12-inch stroke and a rated speed of 120 SPM. Factory data positions it for drilling rigs working in the 4,500 to 8,000 metre depth range. The long-stroke, moderate-speed design is intentional: running fewer strokes per minute for a given output reduces wear cycles on liners, pistons, and valves and seats, and improves suction performance — a real advantage when mud weight climbs in deeper sections. The Gardner Denver PZ-11 has its own long service history in the same class and a large installed base worldwide, which is the key point for parts planning: both pumps are common enough that a mature aftermarket exists, but their fluid-end internals are not interchangeable. Treat them as separate parts programmes, even if they share a rating class.
What the F-1600's Verified Ratings Mean for Your Liner Choice
One of the most useful things about the F-1600 is that its pressure capability scales directly with liner size. Per verified factory data, the pump carries a max working pressure of 5075 PSI at rated input power of 1600 HP, with a 12-inch stroke and rated speed of 120 SPM. The liner-to-pressure relationship is as follows: a 7 in (180 mm) liner is limited to 3345 PSI; 6.75 in (170 mm) to 3692 PSI; 6.5 in (160 mm) to 4235 PSI; 6.25 in (150 mm) to 4663 PSI; 6 in (140 mm) to 4820 PSI; 5.5 in (130 mm) to 5000 PSI; and a 5 in liner reaches the full 5075 PSI. The operational takeaway is straightforward: smaller liners trade flow for pressure. If your well programme calls for higher standpipe pressure in a deep, tight hole section, stepping down a liner size is how you unlock it — but you give up displacement, so hole cleaning must be checked at the new rate. Never run a liner size beyond its rated pressure ceiling; a washed liner or cracked fluid-end module costs far more rig time than a liner change.
Matching the Pump to the Well Programme
Choosing between these two pumps — or deciding which one gets the next overhaul slot — comes down to duty profile rather than nameplate horsepower. The F-1600's 12-inch stroke and 120 SPM rating suit sustained deep-well circulation where fluid-end longevity matters, and its liner ladder lets you reconfigure pressure versus volume as the well deepens. The PZ-11's strength is its enormous installed base and the depth of operator experience behind it; many fleets have decades of maintenance history on the platform. In practice, mixed fleets are common. The mistake to avoid is assuming that because the pumps occupy the same class, their consumables can be pooled. Liners, pistons, valves and seats, and fluid-end modules are pump-model-specific, and a 'close enough' part is a leak path or a premature failure waiting to happen.
Aftermarket Parts Availability: Planning the Supply Side
For both platforms, the aftermarket is deep — the real risk is not availability but accuracy. Shijiazhuang Dongli Petroleum Machinery supplies replacement fluid-end parts and complete pumps across mud pump, well service, HDD, mining and water well applications, covering 472 pump models and major brands including Gardner Denver, Bomco, NOV, Emsco, FMC, Oilwell, Drillmec, Myers and Ideco. For the PZ-11 and F-1600 specifically, that means liners, pistons, valves and seats, and fluid-end modules can be sourced from one partner rather than pieced together from multiple vendors. A few practices that pay off: order parts against the exact pump model and liner bore, not a generic size; keep one full fluid-end consumables set per pump on the rig as a minimum; and align your reorder points with realistic lead times rather than breakdown urgency. A relief safety valve inspection and timely valve and seat replacement are cheap insurance against a fluid-end module failure.
Bottom Line for Rig Managers
The PZ-11 and F-1600 are both proven 1600 HP class pumps, but they reward different management habits. The F-1600's verified ratings — 1600 HP, 12-inch stroke, 120 SPM, and a liner-dependent pressure ladder topping out at 5075 PSI — make it highly configurable across a 4,500 to 8,000 metre drilling envelope. The PZ-11 brings a vast installed base and deep aftermarket support. Whichever you run, disciplined liner selection within rated limits and a model-accurate spare-parts programme are what keep both pumps turning to the right. Dongli supports both platforms with verified-fit replacement fluid-end parts, so your comparison can end with one supply partner rather than two.
FAQ
Are Gardner Denver PZ-11 and Bomco F-1600 fluid-end parts interchangeable?
No. Although both pumps sit in the 1600 HP class, their liners, pistons, valves and seats, and fluid-end modules are model-specific. Always order against the exact pump model and liner bore to avoid leaks, washouts and premature failures.
What is the maximum working pressure of the Bomco F-1600?
Per verified factory data, the F-1600 has a max working pressure of 5075 PSI, achieved with a 5 in liner. Larger liners carry lower pressure ceilings — for example, a 7 in (180 mm) liner is rated to 3345 PSI.
How does liner size affect the F-1600's output?
Smaller liners increase achievable pressure but reduce flow; larger liners deliver more displacement at lower maximum pressure. The factory ratings range from 3345 PSI at 7 in up to 5075 PSI at 5 in, all at the rated 120 SPM.
What rigs is the Bomco F-1600 suited to?
Factory reference data positions the F-1600 for drilling rigs operating in the 4,500 to 8,000 metre depth range. Its 12-inch stroke and 120 SPM rated speed favour suction performance and longer fluid-end wear-part life in deep, high-duty service.
Can one supplier cover both the PZ-11 and the F-1600?
Yes. Dongli's catalogue covers 472 pump models across brands including Gardner Denver, Bomco, NOV, Emsco, FMC, Oilwell, Drillmec, Myers and Ideco, with liners, pistons, valves and seats, and fluid-end modules available for both platforms.