Software for the yard running diaphragm pumps.

A diaphragm pump is what a yard sends out when the fluid is dirty, nasty, or both, and an engine or an electric motor at the pump is a problem. It runs on compressed air — plant air or a rented compressor — so it has no spark and no hot exhaust, which is why it goes into classified areas and onto chemical work other pumps cannot touch. It self-primes, it handles grit and small solids, and it can run dry or sit dead-headed against a closed valve without burning up. That toughness is also what makes it tricky to run as a fleet: it goes out with an air kit and hoses that get separated, the wetted parts must match the fluid, and a diaphragm can rupture without a sound. EquipFlow runs diaphragm pumps the way the yard that built it does — dispatch, billing, maintenance, and return inspection on one record per unit.

Built inside Rental King, right now.

Rental King is a heavy-equipment rental yard in Odessa and Midland, TX. They run diaphragm pumps, manlifts, forklifts, light towers, generators, compressors, and water trucks on MSA contracts through the Permian Basin — 24/7, oilfield pace. EquipFlow was designed and first deployed inside that yard. Every feature was tested against their live operation before it shipped. The product runs there today.

Diaphragm pumps are low-flash, high-churn units, and the money leaks at the edges rather than in the rate. A pump parked on a sump earns nothing extra if its standby hours never reach the invoice, and it loses money twice when it comes back with a ruptured diaphragm or a chemical-eaten wet end that nobody caught and charged. The kit is the other leak: an air hose or a set of camlocks that walked off on a job is a real cost buried in a rounding error. The run-hour meter is the spine of both maintenance and billing, so it has to be captured the same way every time — at return, on the inspection, against the rental record. When dispatch, billing, maintenance, and inspection all read one unit record, the dispatcher quotes the contracted rate, the mechanic rebuilds the wet end against real hours, and the bookkeeper closes the month without reconstructing it from memory.

Diaphragm Pump specs the rental record tracks.

Every number below is a sourced specification range. The render layer is the only path these values reach the page — they live on the unit record, not in a dispatcher's head.

Maximum free-flow rate

123-172gpm

Maximum air inlet pressure

120-125psi

Maximum fluid working pressure

120-125psi

Maximum pumpable solids size

0.25in

Suction lift (dry)

16-20ft

Suction lift (wet/primed)

26-29ft

Inlet/outlet port size

1.5-2in

How EquipFlow handles diaphragm pumps on the dispatch board.

A diaphragm pump rarely leaves the yard alone, and that is the dispatch trap. It needs an air source — the customer's plant air or a rented compressor — plus suction and discharge hose, camlock fittings, and often a grounding strap for flammable or static-prone fluid. A pump sent without the air hose or the right camlock size is a dead unit on arrival and a return trip, so the dispatcher confirms the kit on the rental record before the truck rolls. The board treats each pump as a line on the by-driver, by-hour view: which units are staged on a sump, which are loaded out, which are due back. Because the same small-bore pump class gets double-booked across overlapping completion windows, the board flags the conflict at assignment, not at the gate. Whether the customer is bringing their own compressor or renting one alongside is noted on the record so nobody guesses at the site.

Billing diaphragm pumps — MSA, standby, and site-level tax.

Diaphragm-pump demand in the oilfield runs on master service agreements, so the negotiated rate sits as an override on the customer record per equipment class rather than in a separate sheet a dispatcher has to remember. A pump rental created for that account picks up the contracted rate on its own. These pumps spend long stretches sitting on a sump or a well cellar between fluid events, drawing plant air but doing nothing for hours, and that idle time is exactly what standby billing covers — the dispatcher marks standby and the invoice carries active and standby as separate lines without a month-end rebuild. Delivery, pickup, and any hose-and-fitting add-ons ride the same invoice. Tax follows the delivery-site record, so a pump that moved between leases in different counties bills at the right rate per site. Invoices post to QuickBooks Online on close.

Maintenance on diaphragm pumps.

Diaphragm-pump PM is driven by the hour meter, not the calendar, because one pump can run a continuous sump-out for days while another sits as a yard spare for a season. The run-hour figure is captured on the return inspection and posts to the unit record, and the maintenance module advances the service clock from that reading so the next rebuild lands on real usage. The wear items are specific to this pump: the elastomer diaphragms themselves, the check-ball-and-seat sets on both suction and discharge, and the air valve and pilot spool that shuttle the chambers. A pump run on abrasive slurry or aggressive chemical eats those parts far faster than one moving clean water, so the meter history on the unit record is what tells the mechanic whether a returning pump needs a full wet-end teardown or a quick check. Work orders, parts, and meter history all live on that one record, which is also where a damage charge from a return inspection becomes a repair ticket.

Diaphragm Pump return inspections.

Two rhythms apply. The operator runs a check before each use — air supply clean and dry, hoses and fittings tight, ground strap connected on flammable service — and that is the customer's responsibility while the pump is on rent. The yard's own control is the return inspection. Before a diaphragm pump comes off rent, the driver runs a mobile-web checklist on a phone, no app to install, records the run-hour reading, and attaches required photos that cannot be skipped. The pump-specific checks earn their place here: diaphragm condition and any sign of a rupture, the state of the check balls and seats, air-valve function, wetted-elastomer swelling from an incompatible chemical, and whether the pump came back fouled with cement, mud, or crystallized chemical that the next renter would inherit. The inspection ties to the rental record before the truck leaves the customer site, so a damage dispute has photos and a timestamp behind it.

Common diaphragm pump classes in the field.

The product, the same way it runs for diaphragm pumps.

The sections below are the EquipFlow modules that matter most when running diaphragm pumps — each links to the full feature detail.

Operator guides for running diaphragm pumps.

Field-tested playbooks that go deeper on pricing, dispatch, billing, and maintenance for fleets like this.

• Dewatering Pump Rental Guide →
• Equipment Rental for Oilfield Operations →
• How to Bill for Equipment on Standby →
• How to Handle Rush and Emergency Rentals →

What you give up running diaphragm pumps in EquipFlow.

EquipFlow is a web app, so the return inspection needs a signal to load. On a remote lease with no coverage, the driver cannot finish the mobile inspection at the customer site; most yards run it back at the yard, which means the photos and run-hour reading land later than ideal. There is no telematics integration today, and diaphragm pumps rarely carry it anyway, so the meter is captured by hand at return rather than pulled from a portal. The rate logic is built around the master-service-agreement and standby model the oilfield runs on, so a yard with an unusual fluid-by-the-gallon or metered billing structure should bring it to the demo to be scoped honestly rather than forced into the standard rate.