Class 2 (2nd Engineer) MEKG 📅 Feb 2018

Exam Question

With reference to reciprocating air compressors, explain why

(a) Clearance volume is critical to efficiency

(b) Spring-loaded plate valves are invariably used

(d) Inter-cooling is used between stages

Reference Answer

(a) Bumping clearance is the distance between the piston top and the cylinder cover when the piston is at the Top Dead Center (TDC). For safe and efficient compressor operation, it is typically maintained at 0.5% to 1% of the cylinder diameter .
1. If Bumping Clearance is Too Small:
The piston may physically strike the cylinder cover, leading to mechanical damage, including deformation of the piston, cylinder head, or connecting rod.
Frequent breakdowns and repairs may occur due to damage caused by insufficient clearance.

Full answer on MeoMock — surveyor-grade reference answers for 7,000+ written exam questions.

View plans Browse library

← Browse more questions

Prepare on Android — MeoMock on Google Play