Buyer note: confirm assumptions before quoting
Lead time, MOQ, yield, leak-test scope, machining scope, and landed cost depend on the drawing, alloy, inspection plan, annual volume, and destination market. For current supplier facts, review the supplier capability sheet or send an RFQ package.
# Pump Casing Pressure-Tight RFQ Checklist: Leak-Test, Sealing Interfaces, Machining Datums, and Records
Pump casing RFQs are often treated as “just another housing.” In practice, pump casings become expensive when suppliers quote different assumptions about sealing faces, machining datums, leak testing, and whether impregnation is assumed.
This checklist helps procurement and SQE teams write a quoteable pump casing RFQ so suppliers price the same risk scope.
Useful Bohua routes:
- •Pump casing product proof
- •Pump casing pressure-tight RFQ route
- •Leak-test specification template
- •A356 pump housing RFQ checklist
- •Formal RFQ upload
1) Define the sealing interfaces (do not rely on “leak tight”)
Mark on the drawing:
- •gasket faces / cover faces
- •O-ring grooves and sealing lands
- •threaded ports and plug interfaces
- •any press-fit or bearing-seat features that can leak via distortion
If you have a known leak path risk (porosity exposed on machined faces, core shift into ports, thin-wall areas), list it in the RFQ.
2) Leak / pressure test requirement (method + pressure + acceptance)
Write down, explicitly:
- •test medium (air / nitrogen / helium / water)
- •test method (pressure decay vs helium vs immersion)
- •test pressure (gauge or absolute) and hold time
- •acceptance threshold (leak rate or pressure drop)
- •sampling vs 100% testing (launch vs steady-state)
If you don’t know the exact acceptance threshold yet, request the supplier to propose one and document it as a quote assumption — but do not let the quote omit it.
3) Machining scope and datum strategy (so quotes match)
State:
- •which faces are machined and what finish is required (Ra if relevant)
- •which bores/ports/threads are machined
- •datum scheme for machining + inspection
- •whether the quote includes fixtures and how datum repeatability is controlled
RFQ CTA
Have a casting project? Upload your drawing for a fast, structured quote review.
Send the drawing, target alloy, finishing scope, MOQ, and delivery timing. Bohua will review it like a real sourcing project, not a generic contact request.
If you are comparing suppliers, ask each quote to list the key datums and the assumed stock allowance.
4) Heat treatment and distortion risk (make the assumption visible)
If T6/T5 or stress relief is required:
- •specify temper and controlling standard (if known)
- •call out distortion-sensitive features (bearing seats, cover faces, flange flatness)
- •ask for the inspection evidence after the relevant process stage (after heat treat, after machining)
5) Impregnation policy (allowed or not, and how it is recorded)
Do not leave impregnation ambiguous:
- •allowed yes/no
- •if allowed, require it to be declared in the quote and in shipment records
- •specify whether re-test is required after impregnation
If you are unsure, ask for two quote scenarios: “no impregnation allowed” vs “impregnation allowed with disclosure + re-test.”
6) Inspection record scope (what you want to receive)
Pick the records that match your risk:
- •dimensional layout report (ballooned drawing)
- •CMM report scope for sealing faces, critical bores, and flatness
- •material certificate / chemistry verification
- •leak/pressure test record format (unit-level vs lot-level)
- •any NDT scope (X-ray/CT) when justified by risk
Copy-paste pump casing pressure-tight RFQ starter
> Pressure-tight pump casing RFQ (copy-paste)
> Files: 2D PDF rev __ ; STEP __ ; any defect photos __
> Sealing interfaces: gasket faces __ ; O-rings __ ; ports/threads __ ; bearing seats __
> Test requirement: medium __ ; method __ ; pressure __ ; hold time __ ; acceptance __ ; sampling/100% __
> Alloy + temper: __ (standard if known) ; heat treat yes/no __
> Machining scope: faces __ ; bores __ ; ports/threads __ ; datums A/B/C __ ; surface finish Ra __
> Impregnation: allowed yes/no __ ; disclosure required yes/no __ ; re-test required yes/no __
> Inspection records requested: layout __ ; CMM __ ; material cert __ ; leak/pressure test record __ ; NDT (if required) __
> Quantity + schedule: sample __ ; annual volume __ ; launch timing __ ; destination __
Submit a structured RFQ (drawing-ready)
Project CTA
Need a Reliable Pump Housing Supplier?
Send your drawing for a structured DFM review, quote scope, and project-specific timing discussion.